Co、Mo掺杂对Ni／ZnO—ZrO2催化剂催化噻吩加氢脱硫性能的影响

采用固相合成法制备了ZnO—ZrO2载体，并采用浸渍法制备了镍基催化剂，以噻吩加氢脱硫反应为探针考察了Co、Mo的掺杂对Ni／ZnO—ZrO2催化性能的影响．采用NH，吸附红外光谱（IR）、程序升温脱附（TPD）、程序升温还原（TPR）、X射线衍射（XRD）等技术对催化剂进行了表征．研究结果表明，ZnO－ZrO2复合载体对噻吩加氢脱硫反应有一定的活性，反应温度为400℃时噻吩转化率为6．4％；Co的加入提高了Ni／ZnO-ZrO2的催化活性，噻吩转化率可达97．3％；相反，Mo的掺杂则降低了Ni／ZnO—ZrO2的催化活性，噻吩转化率为65．0％．这是由于Co的掺杂使活性组分Ni分散度提高，氧化态的Ni变得容易还原，在同样的还原条件下催化剂表面有更多的活性中心；而Mo掺杂则使Ni／ZnO—ZrO2催化剂中氧化态的Ni变得难以还原，部分以NiO形式存在，活性中心数量减少．三种催化剂表面均存在L酸中心，Co掺杂使Ni／ZnO-ZrO2催化剂表面弱酸中心和中等强度酸中心的强度及数量均增大．No掺杂则减弱了催化剂表面弱酸中心和中强酸中心的强度．对其酸量则影响不大．

Effect of Co and Mo Dopant on the Properties of Ni/ZnO-ZrO2 for Hydrodesulfurization of Thiophene

Mixed oxide ZnO-ZrO2 was prepared by solid reaction method.Ni catalyst supported on the mixed oxide was prepared by impregnation.Effect of Co and Mo dopant on the properties of Ni/ZnO-ZrO2 for hydrodesulfurization of thiophene was studied.The samples were characterized by infrared spectra(IR),temperature programmed desorption(TPD),temperature programmed reduction(TPR) and X-ray diffraction(XRD).The results indicated that the mixed oxide ZnO-ZrO2 exhibited a little of catalytic activity for hydrodesulfurizat...