Journal ArticleDOI
Synthesis, structure, and acidic properties of MCM-41 functionalized with phosphate and titanium phosphate groups.
T. V. Kovalchuk,H. Sfihi,A. S. Korchev,A. S. Kovalenko,V. G. Il'in,Vladimir Zaitsev,J. Fraissard +6 more
TLDR
A combination of mesoporous structure with acidic properties makes the MCM-41 functionalized with phosphate groups promising for use as solid acid catalysts.Abstract:
Mesoporous molecular sieves Si-MCM-41 (purely siliceous) and Ti-MCM-41 (partly covered with a surface layer of TiO2) were functionalized with phosphate groups by treatment with POCl3 (denoted -MCM-41(P) and Ti-MCM-41(P), respectively). With the use of TEM, X-ray diffraction, and N2 adsorption, it was shown that the initial hexagonal structure, the high specific surface area, and porosity are retained in the functionalized materials but are not as good as in the starting materials. 1H MAS NMR and 31P MAS NMR revealed that the surface of Si-MCM-41(P) consists of silicon phosphate and pyrophosphate species. That of Ti-MCM-41(P) additionally contains titanium dihydro-, hydro-, and pyrophosphate species, the latter being predominant. TPD of adsorbed ammonia for Si-MCM-41(P) and Ti-MCM-41(P) showed that functionalization leads to the creation of moderate and strong acid sites. A combination of mesoporous structure with acidic properties makes the MCM-41 functionalized with phosphate groups promising for use as ...read more
Citations
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Journal ArticleDOI
Hierarchically porous titanium phosphate nanoparticles: an efficient solid acid catalyst for microwave assisted conversion of biomass and carbohydrates into 5-hydroxymethylfurfural
TL;DR: In this paper, a new hierarchical macro/mesoporous titanium phosphate MTiP-1 has been synthesized through a slow evaporation method by using titanium isopropoxide and orthophosphoric acid as inorganic sources and pluronic P123 as the structure directing agent.
Journal ArticleDOI
Ultrafast and high-capacity adsorption of Gd(III) onto inorganic phosphorous acid modified mesoporous SBA-15
TL;DR: In this paper, an inorganic phosphorous acid-modified mesoporous SBA-15 was facilely synthesized by a simple and cost-effective post-grafting approach, and its adsorption behavior towards the rare earth ion Gd(III) was investigated.
Journal ArticleDOI
The role of silver nanoparticles on silver modified titanosilicate ETS-10 in visible light photocatalysis
Zhaoxia Ji,Mariam N. Ismail,Dennis M. Callahan,Eko Pandowo,Zhuhua Cai,Trevor L. Goodrich,Katherine S. Ziemer,Juliusz Warzywoda,Albert Sacco +8 more
TL;DR: In this article, the role of ionic silver, Ag+, and metallic silver (Ag0) on the potential photocatalytic activity of a titanosilicate ETS-10 semiconductor was investigated under visible light irradiation.
Journal ArticleDOI
Meldola blue immobilized on a new SiO2/TiO2/graphite composite for electrocatalytic oxidation of NADH
Camila M. Maroneze,Leliz Ticona Arenas,Rita de Cássia Silva Luz,Edilson Valmir Benvenutti,Richard Landers,Yoshitaka Gushikem +5 more
TL;DR: In this paper, a new SiO 2 /TiO 2/graphite composite was applied in the electrocatalytic oxidation of NADH, decreasing the oxidation potential to −120 mV.
Journal ArticleDOI
Sulfonic acid functionalized MCM-41 as solid acid catalyst for tert-butylation of hydroquinone enhanced by microwave heating
TL;DR: The NH2-MCM-41 was first prepared by anchoring (3-aminopropyl)triethoxysilane (APTES) on Si-MC-41 and further reacted with 1,4-butane-sultone to yield the desired acid catalyst as discussed by the authors.
References
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Journal ArticleDOI
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Journal ArticleDOI
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Journal ArticleDOI
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Journal ArticleDOI
Titanosilicate Mesoporous Molecular Sieve MCM-41: Synthesis and Characterization
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