Journal ArticleDOI
The Acidity and Catalytic Activity of Supported Acidic Cesium Dodecatungstophosphates Studied by MAS NMR, FTIR, and Catalytic Test Reactions
TLDR
The results of catalytic studies show that cesium salts of dodecatungstophosphoric acid with low Cs content supported on silica or MCM-41 are active, selective, and recyclable catalysts in Friedel-Crafts alkylations (isopropylation, transalkylation), the aromatic ortho-Claisen rearrangement, and the dehydration of pinacol as mentioned in this paper.About:
This article is published in Journal of Catalysis.The article was published on 2001-09-10. It has received 30 citations till now. The article focuses on the topics: Transalkylation & Catalysis.read more
Citations
More filters
Journal ArticleDOI
Acidic cesium salts of 12-tungstophosphoric acid as catalysts for the dehydration of xylose into furfural.
TL;DR: Higher HPA loadings, larger pore diameter of the parent silica support, and higher reaction temperatures lead to higher furfural yields, and the stability and reusability of the MCM-41- 41-supported CsPW is higher in DMSO than in T/W.
Journal ArticleDOI
Mesoporous silica-supported 12-tungstophosphoric acid catalysts for the liquid phase dehydration of d-xylose
TL;DR: In this article, a hybrid composites comprising 12-tungstophosphoric acid (PW) immobilized in micelle-templated silicas have been prepared and characterized by several techniques, and were shown to possess dehydration activity for the conversion of xylose to furfural in liquid phase.
Journal ArticleDOI
Zirconia-supported 12-tungstophosphoric acid as a solid catalyst for the synthesis of linear alkyl benzenes
TL;DR: In this paper, a liquid-phase alkylation of benzene with 1-octene and 1-dodecene was investigated with zirconia-supported 12-tungstophosphoric acid (TPA) as catalysts.
Journal ArticleDOI
Heteropoly acid supported on titania as solid acid catalyst in alkylation of p-cresol with tert-butanol
TL;DR: In this paper, the catalytic activity depended on TPA coverage, and the highest activity corresponded to the monolayer of TPA on titania, which was characterized by surface area, XRD, 31P MAS NMR, XPS, NH3-TPD, and FTIR pyridine adsorption.
Journal ArticleDOI
Heteropoly Acid Encapsulated SBA‐15/TiO2 Nanocomposites and Their Unusual Performance in Acid‐Catalysed Organic Transformations
Dhanashri P. Sawant,Josena Justus,Josena Justus,Veerappan V. Balasubramanian,Katsuhiko Ariga,Pavuluri Srinivasu,Sivan Velmathi,S. B. Halligudi,S. B. Halligudi,Ajayan Vinu +9 more
TL;DR: The preparation of SBA-15/TiO(2) nanocomposites with different loadings of Keggin-type 12-tungstophosphoric acid (TPA) nanocrystals in their mesochannels through a simple and effective vacuum impregnation method is reported for the first time, indicating that the acidity and the structural control of the nanocomPOSite materials are highly critical for obtaining excellent catalytic activity.
References
More filters
Reference BookDOI
Handbook of Heterogeneous Catalysis
TL;DR: This paper presents a meta-modelling system that automates the very labor-intensive and therefore time-heavy and therefore expensive and expensive process of characterization and activation of Solid Catalysts.
Journal ArticleDOI
Catalysis by Heteropoly Acids and Multicomponent Polyoxometalates in Liquid-Phase Reactions
Book
High-resolution solid-state NMR of silicates and zeolites
Günter Engelhardt,Dieter Michel +1 more
TL;DR: High-Resolution NMR of Solids and Adsorbed Molecules as mentioned in this paper is a well-known technique for high-resolution NMR for solids and adsorbed molecules.
Book ChapterDOI
Catalytic Chemistry of Heteropoly Compounds
TL;DR: The catalytic properties of heteropoly compounds have drawn wide attention, owing to the versatility of these compounds as catalysts, which has been demonstrated both by success in large-scale applications and by promising laboratory results as mentioned in this paper.
Journal ArticleDOI
Heteropoly Acids and Related Compounds as Catalysts for Fine Chemical Synthesis
TL;DR: In this article, a wide variety of HPAs belonging to the so-called Keggin series are the most important for catalysis and they include heteropolyanions (HPANs) which have metal-oxygen octahedra as the basic structural units.