负载型Ni-B/γ-Al_2O_3非晶态合金催化剂的结构及苯加氢性能

采用化学还原法制备了镍质量分数为7%、镍硼摩尔比为1∶3.4的负载型Ni-B/γ-Al2O3非晶态合金催化剂,并对催化剂进行了表征。结果表明NiB以非晶态的形式负载在γ-Al2O3载体上;Ni-B/γ-Al2O3非晶态合金催化剂的晶化温度应在240~440℃;最佳活化温度在200~260℃。在反应压力0.5 MPa、氢苯比4、空速1.0 h-1的条件下,反应温度高于160℃时,苯加氢制环己烷产率均为100%。     

二异丙基醚是良好的高辛烷值汽油调合组分

以丙烯和水为原料生产的二异内基醚(DIPE)是一种与MTBE性质相近的高辛烷值汽油调合组分,预计有良好的使用前景。介绍了DIPE的性质,与汽油的调合性能及其正在开发的丙烯直接催化水合醚化生产DIPE的方法。     

Pt对NiB非晶态合金催化剂对苯加氢性能的影响

A support (denoted AM) was prepared using pseudo-boehmite and mordenite. Ni-B and NiPtB amorphous catalysts were prepared on the support by the impregnation method followed by chemical reduction with a KBH4 solution. And the catalysts were characterized by X-ray diffraction (XRD), environment scanning electron microscope (ESEM), inductively coupled plasma (ICP), H2-temperature programmed reduction (H2-TPR), differential thermal analysis (DTA), and BET. Benzene hydrogenation was used as a probe reaction to evaluate the effect of addition of small quantities of Pt on the NiB/AM catalyst. The results show that Pt can promote the reduction of NiO and the formation of active sites, leading to smaller catalyst particles and better dispersion of active metal particles on the support. The catalytic activity, sulfur resistance and thermal stability were remarkably improved by Pt doping of the NiB/AM catalyst.