AUTHOR=Dai Xiaojun , Cheng Yan , Si Meng , Wei Qiang , Zhou Yasong 

TITLE=Hydroisomerization of n-Hexadecane Over Nickel-Modified SAPO-11 Molecular Sieve-Supported NiWS Catalysts: Effects of Modification Methods

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.857473

DOI=10.3389/fchem.2022.857473

ISSN=2296-2646

ABSTRACT=Ni-modified SAPO-11 molecular sieves were prepared by the ion-exchange method and the in-situ modification method, and the corresponding Ni-modified SAPO-11 supported NiWS catalysts for the hydroisomerization of n-hexadecane were prepared. The effects of Ni-modification on the properties of SAPO-11 and the active phase were investigated. It was found that Ni-modification methods affected the structure, morphology and acidity of SAPO-11, as well as the interaction between active metals and support, the morphology, dispersibility and stacking number of the active phase. The in-situ modification method not only weakened the interaction between the active metals and the support, which made the stacking number of the active phase greater, but also increased the medium and strong Brønsted acid amount of SAPO-11. It provided a practical solution for improving the acidity of SAPO-11, weakening the interaction between active metals and support and improving the stacking problem of the active phase.