新型深度加氢脱硫催化剂的制备与表征

Preparation and Characterization of a Novel Hydrodesulfurization Catalyst

对采用分步浸渍法制备的NiO-MoO3/-γAl2O3氧化态前驱物进行了硫化、程序升温碳化(TPC)、TPC后再硫化等处理,并进行了XRD、XPS表征;将所得的硫化物、碳氧化物和硫化的碳氧化物催化剂进行了二苯并噻吩的加氢脱硫(HDS)活性评价,并与一种现有的工业催化剂进行了比较。结果表明,对碳氧化物催化剂的硫化处理可以促进碳氧化物催化剂的活性稳定性;这种促进作用源于硫化时部分L酸位向B酸位的转变,所导致的金属的C、S活性物相在临氢时既具有较高的活性位密度和B酸位数目,又保持了一定程度的碳氧化物所具有的加氢活性。

The oxidic precursor,NiO-MoO3/γ-Al2O3,was synthesized by the successive impregnation method.The catalysts resulted from the sulfidation,the temperature programmed carburization（TPC）,and TPC followed by sulfidation of this precursor,as well as a kind of commercial hydrodesulfurization（HDS） catalyst,were evaluated with dibenzothiophene HDS performance and were characterized by XRD and XPS.It was observed that the sulfidation promoted HDS activity and stability of oxycarbide catalyst,which was attributed to the transformation of some Lewis acid sites to Brnsted acid sties favorable for HDS,while some hydrogenation catalytic performance and a majority of active sites were retained at the same time.