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Showing papers on "Benzaldehyde published in 2022"


Journal ArticleDOI
TL;DR: In this article , vanadium carbide (VC) was applied to CdS NWs with facile electrostatic self-assembly and calcination method to increase the photocatalytic activity.

140 citations


Journal ArticleDOI
TL;DR: In this article , a polyoxometalate (POM)-incorporated ZnIn2S4 dual-functional photocatalytic system was used for anaerobic oxidation of benzyl alcohol with concomitant H2 production.
Abstract: Efficient aromatic alcohol oxidation with simultaneous H2 evolution under aqueous conditions is achieved in a polyoxometalate (POM)-incorporated ZnIn2S4 dual-functional photocatalytic system. The synergy between HPM and ZIS contributes to the formation of a Z-type heterojunction structure and thus enhances redox capacity. Moreover, the sub-nanometer size of POM clusters endows molecular-level interfacial contact, which acts as an "electron bridge" ensuring faster interfacial charge transfer kinetics. Therefore, an impressive nearly 100% yield of benzaldehyde and 10.6 mmol·g−1·h−1 H2-evolution rate are observed for POM/ZIS nanocomposites even under an anaerobic atmosphere with water as the solvent. This is the first application of POM-based materials in the anaerobic oxidation of benzyl alcohol with concomitant H2 production. This study expands the possibilities for designing multifunctional POM-based photocatalysts for economic and ecological photoredox applications.

53 citations


Journal ArticleDOI
TL;DR: Wang et al. as mentioned in this paper used the headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS) technique to identify volatile substances formed during the processing of Dezhou braised chicken.

49 citations


Journal ArticleDOI
TL;DR: Wang et al. as discussed by the authors used the headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS) technique to identify volatile substances formed during the processing of Dezhou braised chicken.

49 citations


Journal ArticleDOI
01 Mar 2022-Carbon
TL;DR: In this article , a 2D/2D Co-doped MoS2/CN nano-junction with an edge-enriched 1T phase as the cocatalyst was designed to achieve high photocatalytic performance.

37 citations


Journal ArticleDOI
TL;DR: In this paper, a dielectric barrier discharge (DBD) reactor coupled with nano-sized Au (0.1 ) supported on γ-Al2O3 (denoted as Au/γ-Al 2O3) was used for plasma catalytic oxidation of toluene.

35 citations


Journal ArticleDOI
01 Oct 2022-Fuel
TL;DR: In this paper , a series of Mn-Ce binary oxides loaded monolith catalysts, with the support consisting of Na-Al2O3 grown on Al mesh obtained by steam vapor treating, were prepared to attain efficient toluene degradation.

34 citations


Journal ArticleDOI
TL;DR: In this paper , a 3D binuclear three-dimensional (3D) framework with hierarchical tetragonal-microporous (0.78 nm) and octagonal-nanoporous (1.75 nm) channels is presented.
Abstract: Stable metal-organic frameworks containing periodically arranged nanosized pores and active Lewis acid-base active sites are considered as ideal candidates for efficient heterogeneous catalysis. Herein, the exquisite combination of [Y2(CO2)7(H2O)2] cluster (abbreviated as {Y2}) and multifunctional linker of 2,4,6-tri(2,4-dicarboxyphenyl)pyridine (H6TDP) led to a nanoporous framework of {[Y2(TDP)(H2O)2]·5H2O·4DMF}n (NUC-53, NUC = North University of China), which is a rarely reported binuclear three-dimensional (3D) framework with hierarchical tetragonal-microporous (0.78 nm) and octagonal-nanoporous (1.75 nm) channels. The inner walls of these channels are aligned by {Y2} clusters and plentifully coexisted Lewis acid-base sites of YIII ions and Npyridine atoms. Furthermore, NUC-53 has a quite large void volume of ∼65.2%, which is significantly higher than most documented 3D rare-earth-based MOFs. The performed catalytic experiments exhibited that activated NUC-53 showed a high catalytic activity on the cycloaddition reactions of CO2 with styrene oxide under mild conditions with excellent turnover number (TON: 1980) and turnover frequency (TOF: 495 h-1). Moreover, the deacetalization-Knoevenagel condensation reactions of benzaldehyde dimethyl acetal and malononitrile could be efficiently prompted by the heterogeneous catalyst of NUC-53. These findings not only pave the way for the construction of nanoporous MOF based on rare-earth clusters with a variety of catalytic activities but also provide some new insights into the catalytic mechanism.

33 citations


Journal ArticleDOI
TL;DR: In this paper , a dielectric barrier discharge (DBD) reactor coupled with nano-sized Au (0.1 wt%) supported on γ-Al2O3 (denoted as Au/γ-Al 2O3) was used for plasma catalytic oxidation of toluene.

32 citations


Journal ArticleDOI
TL;DR: In this paper , a dual-functional composite catalyst for photocatalytic hydrogen evolution and benzaldehyde production was proposed, and a new strategy for preventing the photogenerated electrons and holes from recombining by constructing a 0D/2D heterojunction with increased Schottky barrier (SB) sites.
Abstract: Abstract Converting water into hydrogen fuel and oxidizing benzyl alcohol to benzaldehyde simultaneously under visible light illumination is of great significance, but the fast recombination of photogenerated carriers in photocatalysts seriously decreases the conversion efficiency. Herein, a novel dual-functional 0D Cd 0.5 Zn 0.5 S/2D Ti 3 C 2 hybrid was fabricated by a solvothermally in-situ generated assembling method. The Cd 0.5 Zn 0.5 S nano-spheres with a fluffy surface completely and uniformly covered the ultrathin Ti 3 C 2 nanosheets, leading to the increased Schottky barrier (SB) sites due to a large contact area, which could accelerate the electron-hole separation and improve the light utilization. The optimized Cd 0.5 Zn 0.5 S/Ti 3 C 2 hybrid simultaneously presents a hydrogen evolution rate of 5.3 mmol/(g·h) and a benzaldehyde production rate of 29.3 mmol/(g·h), which are ∼3.2 and 2 times higher than those of pristine Cd 0.5 Zn 0.5 S, respectively. Both the multiple experimental measurements and the density functional theory (DFT) calculations further demonstrate the tight connection between Cd 0.5 Zn 0.5 S and Ti 3 C 2 , formation of Schottky junction, and efficient photogenerated electron—hole separation. This paper suggests a dual-functional composite catalyst for photocatalytic hydrogen evolution and benzaldehyde production, and provides a new strategy for preventing the photogenerated electrons and holes from recombining by constructing a 0D/2D heterojunction with increased SB sites.

29 citations


Journal ArticleDOI
05 Jan 2022
TL;DR: This hybrid catalytic system unlocks covalent linkage of molecular catalysts with semiconductor photosensitizers via Schiff base reaction for high-efficiency photocatalytic reduction of CO 2 , opening a pathway for diverse photocatalysis.
Abstract: Efficient and selective photocatalytic CO 2 reduction was obtained within a hybrid system that is formed in situ via a Schiff base condensation between a molecular iron quaterpyridine complex bearing an aldehyde function and carbon nitride. Irradiation (blue LED) of an CH 3 CN solution containing 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole (BIH), triethylamine (TEA), Feqpy-BA (qpy-BA = 4-([2,2':6',2'':6'',2'''-quaterpyridin]-4-yl)benzaldehyde) and C 3 N 4 resulted in CO evolution with a turnover number of 2554 and 95% selectivity. This hybrid catalytic system unlocks covalent linkage of molecular catalysts with semiconductor photosensitizers via Schiff base reaction for high-efficiency photocatalytic reduction of CO 2 , opening a pathway for diverse photocatalysis.

Journal ArticleDOI
TL;DR: In this article , a low-temperature combustion of toluene over Cu-doped SmMn2O5 mullite catalysts via creating highly active Cu2+-O-Mn4+ sites has been originally demonstrated.
Abstract: Catalytic combustion of volatile organic compounds (VOCs) at low temperatures is still an urgent issue to be solved. Herein, low-temperature combustion of toluene over Cu-doped SmMn2O5 mullite catalysts via creating highly active Cu2+-O-Mn4+ sites has been originally demonstrated. Cu-doped SmMn2O5 mullite catalysts exhibited 90% conversion of toluene at 206 °C and displayed robust stability even in the presence of water. It has been demonstrated that Cu doping created Cu2+-O-Mn4+ active composite sites that were more exposed after removing surface Sm species via acid-etching. Benefiting from this, the redox and oxygen activation ability of catalysts was significantly enhanced. The consumption of benzaldehyde and benzoic acid as intermediate species and the CO2 generation ability were apparently promoted, which were the direct reasons for the enhanced low-temperature combustion of toluene. This work provides novel ideas for the development of high-performance catalysts for low-temperature VOC combustion, which has great industrial application prospects.

Journal ArticleDOI
TL;DR: In this paper, the synthesis of NiS nanoparticle-modified CdS nanorod composites (NiS/CdS) as an efficient bifunctional catalyst for the highly selective photocatalytic synthesis of high-value-added product benzaldehyde (BAD) from aqueous solution of benzyl alcohol (BA) under oxygen-free conditions, in accompanying with the efficient hydrogen evolution.

Journal ArticleDOI
TL;DR: In this article, the photocatalytic oxidation of benzyl alcohol by zinc oxide (ZnO) nanocrystals was investigated to clarify the mechanism of selective oxidation with this process.

Journal ArticleDOI
TL;DR: In this article , the synthesis of NiS nanoparticle-modified CdS nanorod composites (NiS/CdS) as an efficient bifunctional catalyst for the highly selective photocatalytic synthesis of high-value-added product benzaldehyde (BAD) from aqueous solution of benzyl alcohol (BA) under oxygen-free conditions, in accompanying with the efficient hydrogen evolution.

Journal ArticleDOI
TL;DR: In this paper, plasmonic Au nanoparticles (Au NP) dispersed over TiO2 photocatalyst with different phases of TiO 2 (amorphous, anatase and rutile) have been synthesized by using facile sol-gel method followed by calcination for the photocatalytic oxidation of benzyl alcohol (BnOH) to benzaldehyde (BzH) under visible light irradiation at ambient conditions.

Journal ArticleDOI
TL;DR: In this paper , plasmonic Au nanoparticles (Au NP) dispersed over TiO2 photocatalyst with different phases of TiO 2 (amorphous, anatase and rutile) have been synthesized by using a facile sol-gel method followed by calcination for the photocatalytic oxidation of benzyl alcohol (BnOH) to benzaldehyde (BzH) under visible light irradiation at ambient conditions.

Journal ArticleDOI
TL;DR: In this article , a photocatalytic method to oxidize polystyrene to aromatic oxygenates under visible light irradiation using heterogeneous graphitic carbon nitride catalysts was demonstrated.
Abstract: Abstract The continuous increase in manufacturing coupled with the difficulty of recycling of plastic products has generated huge amounts of waste plastics. Most of the existing chemical recycling and upcycling methods suffer from harsh conditions and poor product selectivity. Here we demonstrate a photocatalytic method to oxidize polystyrene to aromatic oxygenates under visible light irradiation using heterogeneous graphitic carbon nitride catalysts. Benzoic acid, acetophenone, and benzaldehyde are the dominant products in the liquid phase when the conversion of polystyrene reaches >90% at 150 °C. For the transformation of 0.5 g polystyrene plastic waste, 0.36 g of the aromatic oxygenates is obtained. The reaction mechanism is also investigated with various characterization methods and procedes via polystyrene activation to form hydroxyl and carbonyl groups over its backbone via C–H bond oxidation which is followed by oxidative bond breakage via C–C activation and further oxidation processes to aromatic oxygenates.

Journal ArticleDOI
TL;DR: In this article , a Y(III)-based metal-organic framework, JLU-MOF112, has been successfully synthesized under solvothermal conditions, which can serve as a high-efficiency heterogeneous catalyst for Knoevenagel condensation by the reactions of malonitrile with benzaldehyde.
Abstract: Here, a Y(III)-based metal-organic framework, JLU-MOF112 {[Y3(μ3-O)2(μ3-OH)(H2O)2(BTCTBA)2]·2[(CH3)2NH2]·5DMF·C6H5Cl·4H2O}, has been successfully synthesized under solvothermal conditions. JLU-MOF112 was constructed with amide-functionalized tricarboxylate ligands and Y(III)-based infinite chains, where the Y3 repeating units are arranged in a trans order. The overall framework could be viewed as a novel (3,5)-connected net with two types of channels along the [100] and [010] directions. JLU-MOF112 possesses a large BET surface area (1553 m2 g-1), a permanent pore volume (0.67 cm3 g-1), and outstanding thermal and chemical stability, which give JLU-MOF112 potential for the purification of natural gas, especially the equimolar separation of C3H8/CH4 with a high selectivity of 176. In addition, benefiting from the amide functional groups as Brønsted basic sites and the exposure of open metal sites as Lewis acid sites after activation, JLU-MOF112 can serve as a high-efficiency heterogeneous catalyst for Knoevenagel condensation by the reactions of malononitrile with benzaldehyde (yield of 98%, turnover number of 392, and turnover frequency of 3.27 min-1) and diverse aldehyde compounds. A rational mechanism was put forward that the Knoevenagel condensation was catalyzed by the synergistic effect of the Lewis acid sites and Brønsted basic sites, engendering the polarization of the carbonyl groups and the deprotonation of the methylene groups for nucleophilic attack.

Journal ArticleDOI
TL;DR: In this paper , a polydentate tetracarboxylic acid with a benzothiadiazole unit was used to prepare a pH-stable three-dimensional TbIII-based metal-organic framework (MOF) with the formula {(CH3)2NH2]0.5(lac)0.7[Tb2(BTDBA)1.7(H2O)2]·solvents}n (Hlac = lactic acid, JXUST-19).
Abstract: A new polydentate tetracarboxylic acid with a benzothiadiazole unit (4',4'''-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis([1,1'-biphenyl]-3,5-dicarboxylic acid), H4BTDBA) has been used to prepare a pH-stable three-dimensional TbIII-based metal-organic framework (MOF) with the formula {[(CH3)2NH2]0.7[Tb2(BTDBA)1.5(lac)0.7(H2O)2]·solvents}n (Hlac = lactic acid, JXUST-19). JXUST-19 exhibits a new (4,4,12)-connected topology based on tetranuclear [Tb4] clusters. JXUST-19 can remain stable when soaked in water for at least 1 week and in aqueous solutions with various pH values (2-12) for 24 h. Fluorescence study indicates JXUST-19 can be employed as a rare turn-on and blue-shift MOF sensor toward benzaldehyde (BZ) and salicylaldehyde (SA). To date, JXUST-19 represents the first TbIII-based turn-on MOF sensor toward salicylaldehyde in aqueous solution, and the fluorescence enhancement and naked-eye detection of BZ have been rarely reported. In addition, JXUST-19 based fluorescent test papers, light-emitting diode lamp beads, and portable composite films were developed to realize naked-eye detection of BZ and SA, which has great potential in practical applications.

Journal ArticleDOI
TL;DR: In this paper, a small organic molecule fluorescent probe TPMCN was reported for the selective detection of benzaldehyde and nitrobenzene and the limit of detection (LOD) was calculated to be 2.17μm.

Journal ArticleDOI
17 Jun 2022
TL;DR: In this paper , a new role of graphdiyne (GDY) as the wettability modifier for enhanced hydrogenation catalysis has been demonstrated for gas-liquid-solid tri-phase reactions.
Abstract: Owing to unique alkyne-rich structure, graphdiyne (GDY) has been proven to be a superb support for anchoring metal catalysts. Herein we demonstrate a new role of GDY as the wettability modifier for enhanced hydrogenation catalysis. After loading a certain amount GDY nanospheres, silica mesoporous channels become superaerophilic, which allows gaseous H2 to be directly stored inside, thus significantly increasing H2 concentration around Pd nanoparticles (NPs). At the same time, GDY nanospheres also alter the electronic structure of Pd NPs via the strong d-π interaction. Combining with these two roles of GDY together, the hydrogenation of benzaldehyde could proceed under ambient H2 pressure in water, with an impressive enhancement of 4.3-folds comparing to unmodified Pd/mSiO2 catalyst. This study demonstrates a new role of GDY in constructing wettability matched catalysts for gas-liquid-solid tri-phase reactions.

Journal ArticleDOI
TL;DR: In this paper, a one-dimensional mathematical model by considering axially dispersed plug flow and Langmuir-Hinshelwood (L-H)-based reaction rate as well as linear source spherical emission (LSSE) model for the irradiation distribution on the media surface was developed for the prediction of the byproducts concentration.

Journal ArticleDOI
TL;DR: In this paper , a small organic molecule fluorescent probe TPMCN was reported for the selective detection of benzaldehyde and nitrobenzene and the limit of detection (LOD) was calculated to be 2.17 μM.

Journal ArticleDOI
TL;DR: In this article , the authors showed that the photogenerated holes, superoxide species, and carbon-centered radicals might play the important roles in the generation of benzaldehyde, and the possible photocatalytic toluene oxidation mechanisms over Bi 2 W 0.3 Mo 0.7 O 6 were accordingly proposed.
Abstract: Two-dimensional (2D) Bi 2 WO 6 , Bi 2 MoO 6 , and Bi 2 W x Mo 1− x O 6 ( x = 0.1, 0.3, 0.5, 0.7, and 0.9) solid solution photocatalysts were synthesized using the hexadecyl trimethyl ammonium bromide-assisted hydrothermal method. All of the samples displayed a morphology of irregularly rectangular nanosheets with a thickness of 7.0–17.4 nm. The photocatalytic performance of Bi 2 W x Mo 1− x O 6 was much better than that of Bi 2 MoO 6 or Bi 2 WO 6 for the selective oxidation of toluene, with the Bi 2 W 0.3 Mo 0.7 O 6 solid solution showing the highest benzaldehyde formation rate (1663 μmol/(g h)), which was about 1.95 and 2.83 times higher than those obtained over Bi 2 MoO 6 and Bi 2 WO 6 , respectively. Furthermore, 91% benzaldehyde selectivity and excellent stability were also achieved over Bi 2 W 0.3 Mo 0.7 O 6 . The enhancement in photocatalytic activity of Bi 2 W 0.3 Mo 0.7 O 6 was attributable to the balance of fast charge kinetics and optimized energy band structure. The results of the reactive species trapping and active radicals detection experiments reveal that the photogenerated holes, superoxide species, and carbon-centered radicals might play the important roles in the generation of benzaldehyde, and the possible photocatalytic toluene oxidation mechanisms over Bi 2 W 0.3 Mo 0.7 O 6 were accordingly proposed. Bi 2 W 0.3 Mo 0.7 O 6 exhibits excellent photocatalytic performance for the selective oxidation of toluene to benzaldehyde, which is attributable to the balance of fast charge kinetics and optimized energy band structure. • 2D Bi 2 W x Mo 1− x O 6 solid solution nanosheets are synthesized via the CTAB-assisted hydrothermal route. • Bi 2 W 0.3 Mo 0.7 O 6 shows the highest benzaldehyde formation rate. • Bi 2 W 0.3 Mo 0.7 O 6 exhibits faster charge separation and transfer efficiencies than Bi 2 WO 6 and Bi 2 MoO 6 . • Photogenerated holes, superoxide, and carbon-centered radicals govern the photocatalytic reaction. • Good activity of Bi 2 W 0.3 Mo 0.7 O 6 is due to the balance of fast charge kinetics and optimized energy band structure.

Journal ArticleDOI
10 Apr 2022-Small
TL;DR: In this paper , an efficient spontaneous reduction approach to access atomically dispersed iron atoms supported over defect-containing MoS2 nanosheets is presented. And the isolated iron atoms situate atop of molybdenum atoms and coordinate with three neighboring sulfur atoms.
Abstract: The facile creation of high-performance single-atom catalysts (SACs) is intriguing in heterogeneous catalysis, especially on 2D transition-metal dichalcogenides. An efficient spontaneous reduction approach to access atomically dispersed iron atoms supported over defect-containing MoS2 nanosheets is herein reported. Advanced characterization methods demonstrate that the isolated iron atoms situate atop of molybdenum atoms and coordinate with three neighboring sulfur atoms. This Fe SAC delivers exceptional catalytic efficiency (1 atm O2 @ 120 °C) in the selective oxidation of benzyl alcohol to benzaldehyde, with 99% selectivity under almost 100% conversion. The turnover frequency is calculated to be as high as 2105 h-1 . Moreover, it shows admirable recyclability, storage stability, and substrate tolerance. Density functional theory calculations reveal that the high catalytic activity stems from the optimized electronic structure of single iron atoms over the MoS2 support.

Journal ArticleDOI
TL;DR: In this paper , ultrathin Bi4Ti3O12 nanosheets (NS) with the thickness about 3.9 nm were successfully synthesized by a hydrothermal method and were used as a photocatalyst for the oxidation of benzyl alcohol (BA) to benzaldehyde (BAD).

Journal ArticleDOI
TL;DR: Zn-Ti-layered double hydroxide (ZT-LDH) photocatalyst, which generated less intermediates, showed better toluene degradation efficiency (removal ratio, 75.2%) and stability as discussed by the authors.

Journal ArticleDOI
TL;DR: Zn-Ti-layered double hydroxide (ZT-LDH) photocatalyst, which generated less intermediates, showed better toluene degradation efficiency (removal ratio, 75.2%) and stability as discussed by the authors .

Journal ArticleDOI
TL;DR: In this article , a facile strategy for the synthesis of boron and nitrogen co-doped carbon nanosheet material (BNC), which exhibits excellent catalytic activity with 91% conversion and 99% selectivity in selective oxidation of benzyl alcohol into benzaldehyde, was reported.