Boudjahem Abdel-Ghani, Chettibi Moussa, Monteverdi Serge, Bettahar Mohammed M
Groupe de Catalyse Hétérogène, Laboratoire de Chimie Appliquée, Université de Guelma, BP 401, 24000, Guelma, Algerie.
J Nanosci Nanotechnol. 2009 Jun;9(6):3546-54. doi: 10.1166/jnn.2009.ns28.
Non conventional nickel (1%) and nickel (1%)-copper (0.2-0.75%) catalysts supported on silica, prepared by aqueous hydrazine reduction of nickel acetate at 70 degrees C, were studied in acetylene hydrogenation, mainly at 60 degrees C. The obtained results show that the metal dispersion decreases whereas the conversion passes through a maximum with increasing copper content. The reaction produces ethylene, benzene, ethane, n-butane, small amounts of higher hydrocarbons and a paraffinic product. Ethylene and benzene are rather low temperature products (below 80 degrees C) whereas the saturated hydrocarbons, mainly ethane, are rather formed at higher temperature. The presence of water in the feed gas changed the catalyst performances. The carbonaceous deposit during acetylene hydrogenation was studied by means of temperature programmed surface reaction (TPSR). Analysis of the results obtained showed that the changes observed in conversion/selectivity may be correlated with changes in Ni-Cu interactions, chemisorption equilibria or/and coke deposit. A comparative study of classical/non classical Ni/SiO2 catalysts is reported.
研究了通过在70℃下用肼水溶液还原醋酸镍制备的负载在二氧化硅上的非传统镍（1%）和镍（1%）-铜（0.2 - 0.75%）催化剂，主要在60℃下用于乙炔加氢反应。所得结果表明，随着铜含量的增加，金属分散度降低，而转化率则先升高后降低。该反应生成乙烯、苯、乙烷、正丁烷、少量的高级烃类和一种链烷烃产物。乙烯和苯是低温产物（低于80℃），而饱和烃类，主要是乙烷，则在较高温度下形成。原料气中水分的存在改变了催化剂的性能。通过程序升温表面反应（TPSR）研究了乙炔加氢过程中的积碳情况。对所得结果的分析表明，转化率/选择性的变化可能与镍-铜相互作用、化学吸附平衡或/和焦炭沉积的变化有关。报道了经典/非经典镍/二氧化硅催化剂的对比研究。
