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Selective hydrogenation of acetylene in the presence of ethylene on K+-β-zeolite supported Pd and PdAg catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43904 45994 2007 10 PDF Available
Title
Selective hydrogenation of acetylene in the presence of ethylene on K+-β-zeolite supported Pd and PdAg catalysts
Abstract

The selective hydrogenation of acetylene in the presence of ethylene has been studied on K+ exchanged β-zeolite supported Pd and PdAg catalysts. Results from batch reactor studies with Fourier transform infrared spectroscopy (FTIR) have shown that the K+-β-zeolite support is more selective than the Al2O3 or Na+-β-zeolite supports toward the hydrogenation of acetylene. The rate and equilibrium constants for Pd/K+-β-zeolite and PdAg/K+-β-zeolite were determined using a Langmuir–Hinshelwood model. The selectivity of the PdAg bimetallic catalyst is twice of that of the Pd catalyst. Results from flow reactor studies show that the PdAg/K+-β-zeolite catalyst has higher selectivity but lower activity toward acetylene hydrogenation than the Pd/K+-β-zeolite catalyst. The selectivity to the undesirable ethane by-product is inhibited on the bimetallic catalyst. Extended X-ray absorption fine structure (EXAFS) studies and transmission electron microscope (TEM) analysis confirm the formation of Pd–Ag bimetallic bonds in the PdAg/K+-β-zeolite catalyst.

Graphical abstractThe K+-β-zeolite supported Pd and PdAg catalysts have been synthesized and evaluated using both FTIR batch reactor and flow reactor. The bimetallic PdAg catalyst shows much higher selectivity but lower activity for acetylene hydrogenation in presence of ethylene than the Pd monometallic catalyst. The novel K+-β-zeolite support led to an increase in selectivity due to the preferential adsorption of acetylene over ethylene. This support is superior to the γ-Al2O3 and Na+-β-zeolite used in our previous studies. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Selective hydrogenation; Acetylene; Ethylene; Pd; Pd–Ag; Bimetallic catalysts; K+-β-zeolite; EXAFS; TEM; FTIR
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Selective hydrogenation of acetylene in the presence of ethylene on K+-β-zeolite supported Pd and PdAg catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 333, Issue 2, 15 December 2007, Pages 254–263
Authors
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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