fulltext.study @t Gmail

Selective transformation of glycerol into 1,2-propanediol on several Pt/ZnO solids: Further insight into the role and origin of catalyst acidity

Paper ID Volume ID Publish Year Pages File Format Full-Text
53471 46971 2015 13 PDF Available
Title
Selective transformation of glycerol into 1,2-propanediol on several Pt/ZnO solids: Further insight into the role and origin of catalyst acidity
Abstract

•Different Pt/ZnO solids were tested for glycerol selective transformation into 1,2-PDO.•Supports alone were inactive in the process.•Incorporation of the metal leads to new (mainly Lewis-type) acid sites.•The metal intervenes in dehydration of glycerol into acetol.•The process requires moderate acidity whereas strong acid sites lead to by-products (e.g. CC cleavage).

Microemulsion technique allowed us to synthesize different ZnO solids with similar particle sizes and textural properties. Platinum was subsequently incorporated by deposition–precipitation and impregnation methods and solids tested for glycerol selective transformation into 1,2-PDO. Incorporation of platinum led to the creation of new (mainly Lewis) acid sites. A good correlation between conversion and acidity of Pt/ZnO solids was obtained. Interestingly, despite exhibiting some acidity, supports alone were inactive in the process which evidenced the role of the metal in dehydration of glycerol into acetol. Furthermore, as the reaction proceeded some chlorine coming from the precursor (H2PtCl6) was leached which led to the disappearance of the strongest acid sites, associated to side reactions (catalytic cracking) thus resulting in an increase in selectivity to 1,2-PDO. Eventual formation of Pt–Zn alloy upon reduction of the systems at ca. 400 °C was beneficial to 1,2-PDO selectivity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (174 K)Download as PowerPoint slide

Keywords
Glycerol transformation; Microemulsion technique; Pt/ZnO; 1,2-Propanediol; Role of acid sites; Effect of chlorine
First Page Preview
Selective transformation of glycerol into 1,2-propanediol on several Pt/ZnO solids: Further insight into the role and origin of catalyst acidity
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 257, Part 2, 15 November 2015, Pages 246–258
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us