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Benefits of the SiO2-supported nickel phosphide catalyst on ethylene oligomerization
Applied Catalysis A: General ( IF 4.7 ) Pub Date : 2019-12-12 , DOI: 10.1016/j.apcata.2019.117376
Mi Shin , Hwiram Jeong , Myung-June Park , Young-Woong Suh

Although homogeneous catalytic systems have been central in ethylene oligomerization, the SiO2-Al2O3-supported nickel phosphide (Ni2P) catalyst was recently examined to be capable of transforming ethylene into higher olefins. Herein, better catalytic performance in ethylene oligomerization is achieved with Ni2P/SiO2 than Ni2P/SiO2-Al2O3 and Ni2P/Al2O3. As a factor influencing ethylene oligomerization, the particle size of Ni2P is the smallest over Ni2P/SiO2 due to strong metal-support interaction. While the oligomer productivity is affected by the density of Brønsted acid site present in the supported Ni2P catalysts, Ni2P/SiO2 has a relatively high ratio of Brønsted to Lewis acid sites. Moreover, Ni2P/SiO2 is able to easily generate and transfer hydrogen species via the Brønsted acid P-OH groups, which would affect formation of nickel hydride species that is important in oligomerizing ethylene. Therefore, the above features of Ni2P/SiO2 are beneficial for ethylene oligomerization into higher olefins.



中文翻译:

SiO 2负载的磷化镍催化剂对乙烯低聚的好处

尽管均相催化体系一直是乙烯低聚的中心,但最近研究了SiO 2 -Al 2 O 3负载的磷化镍(Ni 2 P)催化剂能够将乙烯转化为高级烯烃。这里,在乙烯低聚更好的催化性能是用Ni达到2 P /二氧化硅2除Ni 2 P /二氧化硅2 -Al 2 ö 3和Ni 2 P /的Al 2 ö 3。作为影响乙烯低聚的因素,Ni 2 P的粒径比Ni 2最小P / SiO 2由于强烈的金属-载体相互作用而产生。尽管低聚物生产率受负载的Ni 2 P催化剂中存在的布朗斯台德酸中心的密度的影响,但是Ni 2 P / SiO 2具有相对较高的布朗斯台德与路易斯酸中心的比率。此外,Ni 2 P / SiO 2能够通过布朗斯台德酸P-OH基团轻松生成和转移氢物种,这将影响氢化镍物种的形成,这对于乙烯的低聚非常重要。因此,Ni 2 P / SiO 2的上述特征对于乙烯低聚成高级烯烃是有利的。

更新日期:2019-12-13
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