Preparation of Au/C catalysts using microwave-assisted and ultrasonic-assisted methods for acetylene hydrochlorination
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Author list: Wittanadecha W., Laosiripojana N., Ketcong A., Ningnuek N., Praserthdam P., Monnier J.R., Assabumrungrat S.
Publisher: Elsevier
Publication year: 2014
Journal: Applied Catalysis A: General (0926-860X)
Volume number: 475
Start page: 292
End page: 296
Number of pages: 5
ISSN: 0926-860X
eISSN: 1873-3875
Languages: English-Great Britain (EN-GB)
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Abstract
In the present work, the catalytic performance of Au/C catalysts prepared by ultrasonic-assisted, microwave-assisted and incipient wetness impregnation techniques for the hydrochlorination of acetylene to vinyl chloride monomer (VCM) was studied. The catalyst prepared by the ultrasonic-assisted technique significantly exhibited enhanced acetylene conversion activity and selectivity to VCM over a period of 20 h of evaluation. The effect of gold loading on catalyst performance was determined, from which 1% Au was found to be the optimum loading compared to 0.5% and 2.0% loading. Importantly, the effect of different catalyst pretreatments (i.e. with and without H2/HCl and HCl purging prior to the reaction testing) on the catalytic performance was also identified. The use of different pretreatment procedures affects only the initial activity of catalyst, while the long-term activities of catalyst with different pretreatments are almost identical. ฉ 2014 Elsevier B.V.
Keywords
Gold chloride catalyst, Microwave-assisted impregnation, Ultrasonic-assisted impregnation
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