Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (8): 1359-1363.DOI: 10.1016/S1872-2067(14)60166-2

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Effect of KCl on the performance of Cu-K-La/γ-Al2O3 catalyst for HCl oxidation

Kanka Fenga, Chenwei Lia, Yanglong Guoa, Wangcheng Zhana, Binquan Mab, Binwu Chenb, Maoquan Yuanb, Guanzhong Lua   

  1. a. Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China;
    b. Shanghai Chlor-Alkali Chemical Co., Ltd., Shanghai 200241, China
  • Received:2014-05-01 Revised:2014-06-13 Online:2014-08-01 Published:2014-08-05
  • Supported by:

    This work was supported by the National Basic Research Program of China (973 Program, 2010CB732300), Commission of Science and Technology of Shanghai Municipality (13521103402), and Shu Guang Project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation (10SG30).

Abstract:

Cu-K-La/γ-Al2O3 catalysts prepared by the incipient wetness impregnation for the catalytic oxidation of HCl to Cl2 at atmospheric pressure were investigated for the effect of KCl on the catalyst performance. Cu-K-La/γ-Al2O3 catalyst with 5 wt% KCl loading showed good activity and stability due to the promotion by KCl. It gave good activity over a wide range of space velocity of the feed gas and conversion of HCl above 85%, and it was nearly unchanged in activity after 100 h reaction at the conditions of 0.1 MPa, 360 ℃, space velocity of 450 L/(kg-cat·h), and HCl/O2 molar ratio = 2:1. X-ray diffraction results indicated that Cu, K, and La species were highly dispersed on the surface of the γ-Al2O3 support. H2 temperature-programmed reduction results indicated that the addition of KCl favored the reduction of Cu2+ to Cu+ and improved the activity of the active sites of Cu2+ species for HCl oxidation.

Key words: Hydrogen chloride, Catalytic oxidation, Chlorine, Copper-based catalyst, Potassium chloride