Hydroisomerization of n-heptane over MoP/Hβ catalyst doped with metal additive
Hydroisomerization of n-heptane over MoP/Hβ catalyst doped with metal additive
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DOI：
10.1016/j.fuproc.2014.11.034
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发表时间：
2015-03
影响因子：
7.5
通讯作者：
Ping-Xiao Liu;Meng-Yao Wu;Jun Wang;Weihong Zhang;Yongxin Li
中科院分区：
文献类型：
--
作者：
Ping-Xiao Liu;Meng-Yao Wu;Jun Wang;Weihong Zhang;Yongxin Li
采用共浸渍-程序升温还原法制备了Hβ沸石负载磷化钼双功能催化剂（MoP/Hβ），并对正庚烷的加氢异构化进行了催化实验。MoP/Hβ的催化转化和异构化选择性高于对照样品WP/Hβ和HMCM22负载的MoP/HMCM22。此外，Cr、Ni或Ce的掺杂显著提高了MoP/Hβ的活性；同时，cr促进催化剂对异构化产物的选择性也有所提高。采用x射线衍射、brunauer - emmet - teller分析、程序升温解吸NH3和程序升温还原H2对催化剂进行了表征。因此，次级金属添加剂的促进作用与β沸石的孔隙和酸位的减少以及mopox的减少有关。
The bifunctional catalysts of molybdenum phosphide supported on Hβ zeolite (MoP/Hβ) were prepared using a co-impregnation–temperature-programmed reduction method, and catalytically tested in the hydroisomerization ofn-heptane. The catalytic conversion and isomerization selectivity of MoP/Hβ were revealed to be higher than those of the control tungsten phosphide sample WP/Hβ and the HMCM22-supported counterpart MoP/HMCM22. Moreover, doping Cr, Ni, or Ce significantly improved the activity of MoP/Hβ; meanwhile, the Cr-promoted catalyst also gave an enhanced selectivity to isomerization products. The catalysts were characterized by X-ray diffraction, Brunauer–Emmett–Teller analysis, temperature-programmed desorption of NH3, and temperature-programmed reduction of H2. Accordingly, it is suggested that the promoting effect of the secondary metal additive is relative to the reduction of MoPOxspecies, as well as the pores and acid sites of the β zeolite.