Investigation on Development and Application of Catalysts for Hydroalkylation of Benzene(BZ) to Cyclohexylbenzene(CHB)
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TQ426

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    Abstract:

    A series of composite bi-functional catalysts, used to hydroalkylation of BZ into CHB, were prepared by incipient wetting method on the carrier of β. The synergistic effects between catalyst components were investigated by using XRD, BET, TPD and HR - TEM characterization methods. The catalytic performance stability of different catalysts was compared in a fixed bed reactor. And the effect of catalyst composition on BZ conversion and CHB selectivity was examined. The results show that: adding different metals as co-catalysts into Ni/Hβ can regulate the loading particle size, active center dispersion, B/L acidic site concentration on the surface of the catalyst, and the matching of metal catalytic hydrogenation and acid catalytic alkylation of the bi-functional catalyst.The catalytic performance of hydrogenation and alkylation is matched well over 4%Ni-0.2%Pd-3%La/Hβ. Accordingly, the conversation of benzene and the selectivity of cyclohexylbenzene can reach 34.44% and 74.67%, respectively, under the conditions of 220℃, H2 GHSV of 2500 h-1 and benzene LHSV of 2.0 h-1 over the catalyst, and the catalytic performance has no obvious decline within 240 hours.

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History
  • Received:January 22,2017
  • Revised:March 23,2017
  • Adopted:April 17,2017
  • Online: September 04,2017
  • Published:
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