Mo-Ni/Al_2O_3催化剂的TPR特性与加氢脱硫性能

Study on TPR Character and Hydrodesulfurization Properties of Mo Ni/Al 2O 3Catalyst

应用ＴＲＰ、ＸＰＳ及ＸＲＤ等技术研究了用浸渍法制备的Ｎｉ／Ａｌ２Ｏ３、Ｍｏ／Ａｌ２Ｏ３和Ｍｏ－Ｎｉ／Ａｌ２Ｏ３３种催化剂的还原性能，并将Ｍｏ－Ｎｉ／Ａｌ２Ｏ３双金属催化剂与工业化的Ｍｏ－Ｃｏ／Ａｌ２Ｏ３和Ｗ－Ｎｉ／Ａｌ２Ｏ３催化剂进行了比较。结果表明：在Ｍｏ－Ｎｉ／Ａｌ２Ｏ３中，ＭｏＯ３呈高度分散状态，ＮｉＯ的加入减弱了Ｍｏ与载体间的强相互作用，并在催化剂表面形成了两种易还原的复合物，大大降低了还原温度。活性评价结果表明：催化剂的ＴＰＲ特性与加氢脱硫活性有很好的对应关系。Ｎｉ的促进还原和提高活性的功能，可以用氢的溢流机理来解释。

TPR,XPS and XRD techniques were used to study the reduction behavior of NiO,MoO 3 and MoO 3 NiO on γ Al 2O 3 support systematically.Properties of Mo Ni/Al 2O 3 were compared with those of catalyst Mo Co/Al 2O 3and W Ni/Al 2O 3.Results showed that NiO and MoO 3existed in a high degree dispersing state on Mo Ni/Al 2O 3 catalyst.When NiO is introduced into the Mo/Al 2O 3 system,MoO 3 interacts moderately with the support forming two species that can be reduced easily.Ni promotion is found to cause reduction temperature of Mo site shifting to lower temperature.The test of HDS activity indicates that there is an appreciable relationship between the TPR properties of the catalysts and the HDS activity.The function of Ni can be explained by hydrogen spillover from Ni centers to Mo sites.