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Hongyuan Luo

Bio: Hongyuan Luo is an academic researcher from Dalian Institute of Chemical Physics. The author has contributed to research in topics: Catalysis & Heterogeneous catalysis. The author has an hindex of 16, co-authored 30 publications receiving 1424 citations.

Papers
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Journal ArticleDOI
TL;DR: A striking enhancement of the catalytic activity of Rh particles confined inside nanotubes for the conversion of CO and H2 to ethanol within carbon and other nanotube systems is reported.
Abstract: Carbon nanotubes (CNTs) have well-defined hollow interiors and exhibit unusual mechanical and thermal stability as well as electron conductivity1. This opens intriguing possibilities to introduce other matter into the cavities2,3,4,5, which may lead to nanocomposite materials with interesting properties or behaviour different from the bulk6,7,8. Here, we report a striking enhancement of the catalytic activity of Rh particles confined inside nanotubes for the conversion of CO and H2 to ethanol. The overall formation rate of ethanol (30.0 mol mol−1Rh h−1) inside the nanotubes exceeds that on the outside of the nanotubes by more than an order of magnitude, although the latter is much more accessible. Such an effect with synergetic confinement has not been observed before in catalysis involving CNTs. We believe that our discovery may be of a quite general nature and could apply to many other processes. It is anticipated that this will motivate theoretical and experimental studies to further the fundamental understanding of the host–guest interaction within carbon and other nanotube systems.

838 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of ZrO2-based catalysts was evaluated for the synthesis of higher alcohols from synthesis gas, and the crystal phase structures were characterized by X-ray diffraction (XRD) and UV Raman.
Abstract: The catalytic performances of ZrO2-based catalysts were evaluated for the synthesis of higher alcohols from synthesis gas. The crystal phase structures were characterized by X-ray diffraction (XRD) and UV Raman. The results indicated that ZrO2 and Pd modified ZrO2 catalysts were effective catalysts in the synthesis of ethanol or isobutanol, and their selectivities basically depended on the crystal phase of ZrO2 surface. The ZrO2 with surface tetragonal crystal phase exhibited a high activity to form ethanol, while the ZrO2 with surface monoclinic crystal phase exhibited a high activity to form isobutanol. Temperature-programmed desorption (TPD) experiment indicated that the high activity of isobutanol formation from synthesis gas over monoclinic zirconia was due probably to the strong Lewis acidity of Zr4+ cations and the strong Lewis basicity of O2− anions of coordinative unsaturated Zr4+–O2− pairs on the surface of monoclinic ZrO2.

81 citations

Journal ArticleDOI
TL;DR: In this paper, the TPR (temperature programmed reaction) method was used to investigate the active sites for the formation of C2-oxygenates on the Rh-based catalysts.

79 citations

Journal ArticleDOI
TL;DR: In this article, the effect of iron promoter on the catalytic properties of Rh-Mn-Li/SiO 2 catalyst in the synthesis of C 2 oxygenates from syngas was investigated by means of the following techniques: CO hydrogenation reaction, temperature-programmed reduction (TPR), temperatureprogrammed desorption and reaction of adsorbed CO (CO-TPD and TPSR) and pulse adsorption of CO.
Abstract: The effect of iron promoter on the catalytic properties of Rh-Mn-Li/SiO 2 catalyst in the synthesis of C 2 oxygenates from syngas was investigated by means of the following techniques: CO hydrogenation reaction, temperature-programmed reduction (TPR), temperature-programmed desorption and reaction of adsorbed CO (CO-TPD and TPSR) and pulse adsorption of CO. The results showed that the addition of iron promoter could improve the activity of the catalysts. Unexpectedly, the yield of C 2 oxygenates increased greatly from 331.6 up to 457.5 g/(kg h) when 0.05% Fe was added into Rh-Mn-Li/SiO 2 catalyst, while no change in the selectivity to C 2 oxygenates was observed. However, the activity and selectivity of C 2 oxygenates were greatly decreased if the Fe amount exceeded 1.0%. The existence of a little iron decreased the reducibility of Rh precursor, while the reduction of Fe component itself became easier. CO uptake decreased with increasing the quantity of Fe addition. This phenomenon was further confirmed by CO-TPD results. The CO-TPD and TPSR results showed that only the strongly adsorbed CO could be hydrogenated, while the weakly adsorbed CO was desorbed. We propose that Fe is highly dispersed and in close contact with Rh and Mn; such arrangements were responsible for the high yield of C 2 oxygenates.

77 citations

Journal ArticleDOI
TL;DR: In this paper, the chemical state of the mn component was extensively studied with epr after in situ reduction and treatment with various probe molecules, which indicated that on a rh-mn/sio2 catalyst, a rh mixed oxide was formed, which stabilized the rh+ species.
Abstract: Rh-based catalysts to be used for the synthesis of c-2-oxygenates from syngas were characterized with epr, tpr, ir and xps methods. the chemical state of the mn component was extensively studied with epr after in situ reduction and treatment with various probe molecules. the results indicated that on the mn/sio2 catalyst, mn can exist as isolated mn2+ ions on the surface of sio2 through the formation of coordination compounds with surface hydroxyls and h2o molecules as ligands. thermal reduction of the mn/sio2 catalyst resulted in the migration and accumulation of the mn2+ ions. the results of tpr, ir, xps were consistent with those of epr, which indicated that on a rh-mn/sio2 catalyst, a rh-mn mixed oxide was formed, which stabilized the rh+ species. the formation of small clusters of the rh-mn mixed oxide inhibited deep reduction and accumulation of the mn component, while at the same time increased the dispersion of the rh component. as a promoter, mn acts as an electron acceptor, while li exhibits an electron-donation effect. the li component can inhibit the formation of rh-mn mixed oxide and increase the concentration of rh-0 on the surface of sio2. the existence of li may also cause the tilted-adsorption form of co on rh, as well as the spillover of h-2 from rh to the sio2 support. (c) 1999 elsevier science b.v. all rights reserved.

60 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the opportunities and prospects in the chemical recycling of carbon dioxide to fuels, as a complementary technology to carbon sequestration and storage (CSS), are analyzed, and it is remarked that the requisites for this objective are (i) minimize as much as possible the consumption of hydrogen (or hydrogen sources), (ii) produce fuels that can be easily stored and transported, and (iii) use renewable energy sources.

1,208 citations

Journal ArticleDOI
TL;DR: This poster presents a probabilistic procedure to evaluate the response of the H2O/O2 mixture to various pyrolysis conditions and shows promising results in both the horizontal and the vertical domain.
Abstract: Dang Sheng Su,*,†,‡ Siglinda Perathoner, and Gabriele Centi* †Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, 72 Wenhua Road, Shenyang 110006, China ‡Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany Dipartimento di Ingegneria Elettronica, Chimica ed Ingegneria Industriale, University of Messina and INSTM/CASPE (Laboratory of Catalysis for Sustainable Production and Energy), Viale Ferdinando Stagno, D’Alcontres 31, 98166 Messina, Italy

1,108 citations

Journal ArticleDOI
09 May 2014-Science
TL;DR: It is reported that single iron sites embedded in a silica matrix enable direct, nonoxidative conversion of methane, exclusively to ethylene and aromatics, representing an atom-economical transformation process of methane.
Abstract: The efficient use of natural gas will require catalysts that can activate the first C-H bond of methane while suppressing complete dehydrogenation and avoiding overoxidation. We report that single iron sites embedded in a silica matrix enable direct, nonoxidative conversion of methane, exclusively to ethylene and aromatics. The reaction is initiated by catalytic generation of methyl radicals, followed by a series of gas-phase reactions. The absence of adjacent iron sites prevents catalytic C-C coupling, further oligomerization, and hence, coke deposition. At 1363 kelvin, methane conversion reached a maximum at 48.1% and ethylene selectivity peaked at 48.4%, whereas the total hydrocarbon selectivity exceeded 99%, representing an atom-economical transformation process of methane. The lattice-confined single iron sites delivered stable performance, with no deactivation observed during a 60-hour test.

1,020 citations

Journal ArticleDOI
TL;DR: A striking enhancement of the catalytic activity of Rh particles confined inside nanotubes for the conversion of CO and H2 to ethanol within carbon and other nanotube systems is reported.
Abstract: Carbon nanotubes (CNTs) have well-defined hollow interiors and exhibit unusual mechanical and thermal stability as well as electron conductivity1. This opens intriguing possibilities to introduce other matter into the cavities2,3,4,5, which may lead to nanocomposite materials with interesting properties or behaviour different from the bulk6,7,8. Here, we report a striking enhancement of the catalytic activity of Rh particles confined inside nanotubes for the conversion of CO and H2 to ethanol. The overall formation rate of ethanol (30.0 mol mol−1Rh h−1) inside the nanotubes exceeds that on the outside of the nanotubes by more than an order of magnitude, although the latter is much more accessible. Such an effect with synergetic confinement has not been observed before in catalysis involving CNTs. We believe that our discovery may be of a quite general nature and could apply to many other processes. It is anticipated that this will motivate theoretical and experimental studies to further the fundamental understanding of the host–guest interaction within carbon and other nanotube systems.

838 citations

Journal ArticleDOI
TL;DR: This paper presents a meta-analyses of the proton-probes of Na6(CO3)(SO4)2, Na2SO4, and Na2CO3 of the response of the H2O/O2 “spatially aggregating substance,” which has the potential to alter the structure of the molecule and provide clues to the “building blocks” of DNA.
Abstract: Lung Wa Chung,† W. M. C. Sameera,‡ Romain Ramozzi,‡ Alister J. Page, Miho Hatanaka,‡ Galina P. Petrova, Travis V. Harris,‡,⊥ Xin Li, Zhuofeng Ke, Fengyi Liu, Hai-Bei Li, Lina Ding, and Keiji Morokuma*,‡ †Department of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China ‡Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo, Kyoto 606-8103, Japan Newcastle Institute for Energy and Resources, The University of Newcastle, Callaghan 2308, Australia Faculty of Chemistry and Pharmacy, University of Sofia, Bulgaria Boulevard James Bourchier 1, 1164 Sofia, Bulgaria Department of Chemistry, State University of New York at Oswego, Oswego, New York 13126, United States State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, China School of Ocean, Shandong University, Weihai 264209, China School of Pharmaceutical Sciences, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China

833 citations