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Effects of NaCl on Pt/ZrO2 catalysts for selective hydrogenation of crotonaldehyde

Paper ID Volume ID Publish Year Pages File Format Full-Text
41826 45901 2010 7 PDF Available
Title
Effects of NaCl on Pt/ZrO2 catalysts for selective hydrogenation of crotonaldehyde
Abstract

A series of NaCl-modified Pt/ZrO2 catalysts were prepared and tested for vapor phase selective hydrogenation of crotonaldehyde. It was found that the reactivities of the catalysts increased with NaCl contents, with the highest selectivity to crotyl alcohol (60%) at a NaCl content of 1%. Ammonia temperature programmed desorption and Fourier transmission infrared spectra of pyridine adsorption results indicated that the strengths of surface Lewis acids of the catalysts were weakened with increasing NaCl contents, such weakening was responsible for the enhancement of the reactivity. Diffuse reflectance infrared transform spectra of CO adsorption and X-ray photoelectron spectrometer results suggested that increased electron density on Pt species with the NaCl modification was responsible for the enhanced selectivity. However, high NaCl content (>3%) in the catalyst resulted in the growth of Pt particles and fewer interfacial Pt sites contacting with the surface Lewis acid sites, such changes were unfavorable for the selectivity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (53 K)Download as PowerPoint slideResearch highlights▶ The catalytic behavior of Pt/NaCl/ZrO2 depends on NaCl content. ▶ The increase of electron density on Pt is beneficial for the selectivity. ▶ The hydrogenation of CO occurs on the interfacial surfaces of Pt and Lewis sites.

Keywords
Pt/NaCl/ZrO2 catalyst; NaCl; Crotonaldehyde hydrogenation; Crotyl alcohol
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Effects of NaCl on Pt/ZrO2 catalysts for selective hydrogenation of crotonaldehyde
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 388, Issues 1–2, 20 November 2010, Pages 134–140
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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