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Controlled surface properties of Au/ZSM5 catalysts and their effects in the selective oxidation of ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
53958 46990 2015 8 PDF Available
Title
Controlled surface properties of Au/ZSM5 catalysts and their effects in the selective oxidation of ethanol
Abstract

•Au/ZSM5 was pretreated by nonthermal oxygen plasma and employed.•Surface property was crucial to control the catalytic activity in ethanol oxidation.•Nearly 100% selectivity toward selective oxidation products.•The catalyst was stable compared to the ones subjected to thermal pretreatment.

The catalytic activity of gold supported on ZSM5 (Au/ZSM5) was investigated for the selective oxidation of ethanol in the presence of excess oxygen. Au/ZSM5 catalyst pretreated by nonthermal O2 plasma method showed the best oxidative activity compared to low-temperature calcination in air and high-temperature reduction in hydrogen atmosphere. Results from microscopy and X-ray diffraction characterizations proved that plasma pretreatment afforded a small Au particle size and a uniform dispersion of Au nanoparticles on ZSM5 surfaces. Characterization results further demonstrated that the residual ammonia adsorbed on ZSM5 surfaces during the precipitation can be oxidized to nitrate ions by nonthermal O2 plasma treatment, while it converted to NO+ by low-temperature oxygen calcination and was completely removed by high-temperature hydrogen reduction. Dissimilar surface/interface properties caused the tremendously different interaction between gold nanoparticles and zeolite support, and consequently the catalytic performances in ethanol oxidation. In particular, under the nonthermal O2 plasma pretreatment, the formed NO3− species lowered the acidity of ZSM5 surfaces as well as anchored the Au nanoparticles, resulting in nearly 100% selectivity toward selective oxidation instead of acid-catalyzed reactions even under high reaction temperature.

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Keywords
Surface properties; O2 plasma; Low-temperature reduction; Au/ZSM5; Ethanol oxidation
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Controlled surface properties of Au/ZSM5 catalysts and their effects in the selective oxidation of ethanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 256, Part 1, 1 November 2015, Pages 153–160
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