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The effect of P/Ta ratio on sorbitol dehydration over modified tantalum oxide by phosphoric acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
50405 46794 2014 5 PDF Available
Title
The effect of P/Ta ratio on sorbitol dehydration over modified tantalum oxide by phosphoric acid
Abstract

•Phosphoric acid modification could significantly improve the activity of Ta2O5.•Isosorbide selectivity over 0.8P/TaO was improved from 3.8 to 48.3%.•The catalytic performance was mainly promoted by the P-OH species in TaH(PO4)2.

A series of modified hydrated tantalum oxides (Ta2O5·nH2O) with various contents of phosphoric acid were prepared and firstly used as the catalysts for sorbitol dehydration to isosorbide. The catalytic performance of Ta2O5 was improved significantly after modification, and the isosorbide selectivity over 0.8P/TaO was improved from 3.8 to 48.3% with nearly 100% sorbitol conversion. Characterization with NH3-TPD, FT-IR, Raman and XRD demonstrated that the introduction of phosphate has transformed Ta2O5 into two kinds of new crystalline phases exhibiting various surface acidities. The P-OH species in TaH(PO4)2 were mainly responsible for the promotion of catalytic performance over modified oxides.

Keywords
Phosphoric acid; Hydrated tantalum oxide; Dehydration; Sorbitol
First Page Preview
The effect of P/Ta ratio on sorbitol dehydration over modified tantalum oxide by phosphoric acid
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 43, 5 January 2014, Pages 29–33
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis