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Free-mercury catalytic acetylene hydrochlorination over bimetallic Au-Bi/γ-AlO:A low gold content catalyst

Catalysis Letters, ISSN: 1572-879X, Vol: 144, Issue: 12, Page: 2191-2197
2014
  • 29
    Citations
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    Usage
  • 6
    Captures
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    29
    • Citation Indexes
      29
  • Captures
    6

Article Description

Gold and gold-based bimetallic catalysts for acetylene hydrochlorination were prepared with HAuCl•4HO and BiCl as precursors and γ-AlO as the support. Their catalytic performances for acetylene hydrochlorination were tested in a fixed-bed reactor under the fixed reaction conditions of temperature 150 °C, CH hourly space velocity 120 h, feed volume ratio V (HCl)/V (CH) = 1.05. Then they were analyzed by the characterization methods of BET, XRD, SEM, TG, TPR and XPS. The results showed that the Au/γ-AlO catalyst exhibited a high activity with only 0.1 wt% Au loading but it deactivated easily for both coke deposition and valance change. With the addition of Bi, it inhibited the reduction of Au to Au in both the preparation and the reaction process. Besides, the coke deposition was apparently weakened. The best catalytic performance was obtained over 0.1Au5Bi/γ-AlO catalyst with an acetylene conversion of 96 % and a selectivity to VCM of more than 99 % (Au loading, only 0.1 wt%) for running more than 10 h. Graphical Abstract: The Au-Bi/γ-AlO catalyst can decrease significantly the Au loading from more than 1 to 0.1 wt% with the satisfied acetylene conversion compared with the activity carbon support. The addition of Bi can inhibited the reduction of Au and coke deposition.[Figure not available: see fulltext.]

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