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The experiment and modeling of supported Wacker-type catalyst for CO oxidation at high relative humidity

Paper ID Volume ID Publish Year Pages File Format Full-Text
54194 47000 2015 7 PDF Available
Title
The experiment and modeling of supported Wacker-type catalyst for CO oxidation at high relative humidity
Abstract

•Water led to the change of texture and chemical properties of the catalyst.•Irreversible deactivation played a key role at lower temperature or high relative humidity.•The modeling results were well consistent with the experimental data of CO oxidation at higher relative humidity.

The difficulty of maintaining steady reaction is generated when water presents on supported Wacker-type catalyst in CO oxidation. Water can be adsorbed and condensed on catalyst surface, which facilitated Cu species transporting from the surface into the inner part of support. This weakened the contact between Pd and Cu species and caused their existence in low valence. The temperature difference between the co-reduction peak of Pd and Cu species and the individual Cu species in H2-TPR profile was found to have a linear relationship with the extent of deactivation. A mathematic model was developed and the effects of flow rate, CO concentration, temperature and relative humidity were also analyzed. The mathematic model well described the performance of CO oxidation at high relative humidity. Combined with the characteristic and modeling results, it was known that irreversible deactivation played a key role at lower temperature/higher relative humidity; while reversible deactivation was responsible for the instability at higher temperature/lower relative humidity.

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Keywords
CO oxidation; Deactivation; Modeling; Water
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The experiment and modeling of supported Wacker-type catalyst for CO oxidation at high relative humidity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 242, Part B, 15 March 2015, Pages 315–321
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
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Online Support
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