Bimodal cesium hydrogen salts of 12-tungstosilicic acid, Cs H4−SiW12O40, as highly active solid acid catalysts for transesterification of glycerol tributyrate with methanol

Autor:	Ryu Abe, Yuichi Kamiya, Lina Mahardiani, Yukari Iwase, Shogo Sano
Rok vydání:	2014
Předmět:	chemistry.chemical_classification Aqueous solution Chemistry Inorganic chemistry Microporous material Transesterification Isopropyl acetate Catalysis chemistry.chemical_compound Acid strength Methanol Physical and Theoretical Chemistry Mesoporous material
Zdroj:	Journal of Catalysis. 318:34-42
ISSN:	0021-9517
Popis:	Bimodal CsxH4−x[SiW12O40] (Csx-bimodal) with mesopores interconnected with micropores were synthesized from microporous CsxH4−x[SiW12O40] (Csx-micro) with x = 1.0–2.5, which were prepared in advance by titrating an aqueous solution of H4[SiW12O40] with an aqueous solution of Cs2CO3, followed by treatment in refluxing ethanol to mainly dissolve the H4[SiW12O40] in the particles. Mesopore size distributions and their pore volumes changed depending on x in Csx-micro. Microporous Cs2.5-micro transformed into bimodal Cs2.5-bimodal with mesopores having average diameters of 3.7 nm and large mesopore volumes. Although Cs2.5-bimodal exhibited only low catalytic activity for the decomposition of isopropyl acetate, post-treatment in H2SO4 enhanced the catalytic activity due to substitution of the Cs+ ions on the surface with H+. H2SO4-treated Csx-bimodal showed high activity toward transesterification of glyceryl tributyrate with methanol due to its strong acid strength and mesoporosity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cf1667ad098455ce345ebbab2c187699 https://doi.org/10.1016/j.jcat.2014.07.008 Zobrazit plný text záznamu Full Text from ScienceDirect