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Hydrodechlorination of CCl4 over Pt/γ-Al2O3 prepared from different Pt precursors

Paper ID Volume ID Publish Year Pages File Format Full-Text
43203 45958 2008 12 PDF Available
Title
Hydrodechlorination of CCl4 over Pt/γ-Al2O3 prepared from different Pt precursors
Abstract

The platinum particle size on γ-Al2O3 prepared from different platinum precursors such as Pt(NH3)2(NO2)2, H2PtCl6, and K2PtCl6, and its effect on hydrodechlorination (HDC) of CCl4 with the variation of calcination temperatures was investigated. It concomitantly affects the products distribution and catalytic stability in HDC of CCl4. To verify the effects of platinum particle size with different platinum precursors on the product distribution, the catalysts have been characterized by HRTEM and CO chemisorption, FT-IR, and TP methods (TPR, TPD and TPSR). The catalysts with small platinum particles, which possess low coordination number and electron-deficient character, favor the complete dechlorination of CCl4 and produce CH4 more selectively. It could be due to the strong adsorption strength of CCl4 or the decreased activation energy of surface intermediates on small platinum particles. FT-IR studies reveal that the maximum peak position of linear-bonded CO shifted to the higher frequency with the increase of platinum particle size in all catalysts prepared from three different platinum precursors. While the selectivity to CH4 increased with the decrease in the platinum particle size, the total amount of carbonaceous species on the platinum particles was enhanced. The larger the platinum particle, the higher the selectivity to CHCl3 was obtained in all tested catalysts under the non-deactivating condition.

Graphical abstractThe maximum peak position of linear-bonded CO shifted to the higher frequency with the increase of platinum particle size in all catalysts prepared from three different platinum precursors. The small platinum particles, which possess low coordination number and electron-deficient character, favor the complete dechlorination of CCl4 and produce CH4 more selectively.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrodechlorination; CCl4; Platinum particle size; γ-Al2O3; Product distribution
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Hydrodechlorination of CCl4 over Pt/γ-Al2O3 prepared from different Pt precursors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 334, Issues 1–2, 1 January 2008, Pages 156–167
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