The direct synthesis of Ni/SAPO-11 hydroisomerization catalyst via a novel two-step crystallization strategy  

作　　者：Wei-Long Zhan Yu-Chao Lyu Xin-Mei Liu Lei Fan Fu-Rang Li Ye Yang 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Qingdao,266580,China [2]College of Chemical Engineering,China University of Petroleum,Qingdao,266580,China

出　　处：《Petroleum Science》2022年第5期2448-2459,共12页石油科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22108308,21978326,21991091);the Natural Science Foundation of Shandong Province(ZR2021QB062,ZR2019MB029);the China Postdoctoral Science Foundation(2020M682259);the Project of Qingdao West Coast New Area District Science and Technology Innovation Center(Grant No.20202-2);the Fundamental Research Funds for the Central Universities(22CX06014A)。

摘　　要：The Ni/SAPO-11 catalyst used for n-hexane hydroisomerization was prepared via a novel two-step crystallization strategy.It involves introduction of nickel salt into the pre-crystalized system of SAPO-11 by grinding followed by a second crystallization step.No extra solvent is introduced during the whole synthesis procedure which reduces waste liquid emissions significantly.More importantly,interaction between nickel and support is effectively regulated by the novel method to achieve a well dispersed nickel species and inhibit formation of inert nickel spinel simultaneously.Chemical environments of framework Si are tuned to enhance surface acidity of the Ni/SAPO-11 catalyst.It also shows smaller particle size which favors fast diffusion of reactants and products.Insights into the two-step crystallization indicate that accumulation of SAPO-11 precursors in the pre-crystallization stage,pH regulation by nickel salt and structural directing effect of Ni2+during the second crystallization period account for the rapid crystal growth and smaller particle size of the Ni/SAPO-11 catalyst.All the unique features endow the Ni/SAPO-11 catalyst higher activity and isomers selectivity than the Pt/SAPO-11 catalyst in n-hexane hydroisomerization.

关 键 词：Two-step crystallization Hydroisomerization catalyst NICKEL SAPO-11 SYNTHESIS 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]