甲醇气相羰化复合催化剂的制备及性能研究

用浸渍法制备了甲醇气相羰化Ni-Mo-La/AC三组分复合催化剂,用BET、XRD、XPS等表征手段进行了表征分析,并考察了催化剂制备因素对催化活性的影响。实验证明,在Ni-Mo/AC中加入稀土,可显著的提高Ni的表面分散,提高催化剂的催化活性,且选择性有利于醋酸。最佳催化剂的制备方法为用钼酸铵水溶液和硝酸镍、硝酸镧甲醇溶液两步浸渍活性炭。La最佳质量负载量为2.7%,催化剂焙烧和还原最合适的温度均为450℃。制得的催化剂,可获得96.72%的甲醇转化率和70.45%的羰化产物(醋酸甲酯和醋酸)产率。

Preparation and catalytic performance of composite catalyst for vapor phase carbonylation of methanol

Three-component catalyst Ni-Mo-La/AC was prepared by impregnation method and characterized by BET,XRD and XPS.The effects of preparation conditions on the catalytic activity were investigated.The results indicated that the addition of rare-earth metals was favorable to Ni diffusion on the catalyst surface,and improved the catalytic activity and the selectivity to acetate acid.The optimum catalyst was prepared by two-step impregnating activated carbon with aqueous solution of ammonium molybdate and methanol solution of nickel nitrate and lanthanum nitrate.The optimum La loading was 2.7% by mass,and the optimum temperature for calcination and reduction of catalyst was 450℃.The prepared catalyst could obtain a molar yield of carbonyl compounds,methyl acetate and acetic acid,of 70.45% with a methanol conversion of 96.72%.