n-Hexane isomerization on Ni-Pt catalysts/supported on HUSY zeolite: The influence from a metal content
n-Hexane isomerization on Ni-Pt catalysts/supported on HUSY zeolite: The influence from a metal content
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DOI：
10.1016/j.cattod.2005.07.056
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发表时间：
2005-10
期刊：
影响因子：
5.3
通讯作者：
C. Yoshioka;T. Garetto;D. Cardoso
中科院分区：
文献类型：
--
作者：
C. Yoshioka;T. Garetto;D. Cardoso
制备了含Ni、Pt或两者的双功能催化剂，催化剂的金属含量为：30、130和180×10−6atg /g催化剂。这些催化剂是由[Ni(NH3)6] cl2和[Pt(NH3)4] cl2配合物的水溶液竞争性离子交换产生的。对催化剂进行了预定温度还原（TPR），并在250℃和1atm下对正己烷异构化进行了催化评价。TPR结果表明，在Pt存在下，Ni+2离子具有更大的还原性。与单金属Ni催化剂相比，双金属Ni-Pt催化剂具有更小的失活和更高的活性。随着Ni含量的增加，生成二分枝烷烃的选择性增加。
Bi-functional catalysts were prepared to contain Ni, Pt or both, supported on a HUSY zeolite, with the following metal contents: catalysts 30, 130 and 180×10−6atg metal/g catalyst. These catalysts resulted from a competitive ion exchange with the use of aqueous solutions from [Ni(NH3)6]Cl2and [Pt(NH3)4]Cl2complexes. The catalysts were provided with a scheduled temperature reduction (TPR) and subjected to a catalytic assessment on the n-hexane isomerization at 250°C and 1atm. TPR results showed larger reducibility of Ni+2cations in the presence of Pt. Bi-metallic Ni-Pt catalysts showed to have smaller deactivation and much higher activity compared to monometallic Ni catalysts. The selectivity for the production of di-ramified alkanes increases as the Ni content increases.