物理化学学报 >> 2001, Vol. 17 >> Issue (06): 552-554.doi: 10.3866/PKU.WHXB20010616

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K2O对合成DMC用Cu-Ni/V2O5-SiO2催化剂性能的影响

黎汉生;钟顺和;王建伟;肖秀芬   

  1. 天津大学化工学院,天津 300072
  • 收稿日期:2000-10-13 修回日期:2001-01-02 发布日期:2001-06-15
  • 通讯作者: 钟顺和 E-mail:shzhong@public.tpt.tj.cn

Effect of K2O on Properties of Cu-Ni/V2O5-SiO2 Catalyst for the Synthesis of Dimethyl Carbonate

Li Han-Sheng;Zhong Shun-He;Wang Jian-Wei;Xiao Xiu-Fen   

  1. College of Chemical Engineering and Technology, Tianjin University,Tianjin 300072
  • Received:2000-10-13 Revised:2001-01-02 Published:2001-06-15
  • Contact: Zhong Shun-He E-mail:shzhong@public.tpt.tj.cn

关键词: K2O助剂, 负载型Cu-Ni催化剂, 二氧化碳, 甲醇, 碳酸二甲酯(DMC)

Abstract: V2O5SiO2(VSiO) supported CuNiK2O catalysts for the synthesis of dimethyl carbonate were prepared using isovolumic impregnation. Based on TPR,TPD, IR and microreactor techniques, the effect of K2O on the adsorption and reaction of CO2 and CH3OH on the catalyst were characterized. The results show that addition of K2O exerts obvious influence on the charge distribution of the active sites on CuNi/VSiO catalyst,increases the intensities of CO2 horizontal adsorption state, while that of the dissociation state of methanol descends. When the ratio of K is above 15 %, K2CO3 is formed on the catalyst. Moreover,the main reaction products of CO2 and CH3OH on CuNiK2O/VSiO catalyst are still DMC, H2O, CO and CH2O,and with the addition of K2O, the conversion of reactants rise, but the selectivity of by-products decreases.

Key words: K2O, Supported Cu-Ni catalyst, Carbon dioxide, Methanol,  Dimethyl carbonate