Kinetics of n-hexane hydroisomerization over HZSM-5 supported platinum catalysts. Features of the process mechanism and the Ni-promoting effect

Kinetics of n-hexane hydroisomerization over HZSM-5 supported platinum catalysts. Features of the process mechanism and the Ni-promoting effect Full article

Journal

Molecular Catalysis
ISSN: 2468-8231 , E-ISSN: 2468-8274

Output data

Year: 2021, Volume: 515, Article number : 111880, Pages count : DOI: 10.1016/j.mcat.2021.111880

Authors

Loc Luu Cam ^1,2 , Gaidai N.A. ³ , Tri Nguyen ² , Thoa Dao Thi Kim ¹ , Kogan V.M. ³ , Cuong Hoang Tien ² , Agafonov Yu.A. ³

Affiliations

1	Ho Chi Minh City University of Technology (HCMUT-VNU-HCM), 268, Ly Thuong Kiet Street, Ho Chi Minh City, Viet Nam
2	Institute of Chemical Technology, Vietnam Academy of Science and Technology, 1A, TL29 Street, Thanh Loc Ward, District 12, Ho Chi Minh City, Viet Nam
3	N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia

Kinetic studies of the hydroisomerization of n-hexane under stationary and non-stationary conditions for Pt/HZSM-5 catalysts promoted and non-promoted with nickel have been carried out. The catalysts were studied by the low-temperature N2 adsorption-desorption, X-ray diffraction, transmission electron microscopy, TPR-H2, and TPD-NH3 methods. It is found that the kinetic equation of n-hexane isomerization on both catalysts is written by a common fractional-rational equation, in which the hydrogen exhibits a positive effect on the reaction rate. However, the values of the kinetic constants of the reaction on the two catalysts differ, showing the influence of the Ni additive on the catalyst properties and the reaction kinetics. The introduction of Ni into Pt/HZSM was accompanied by a decrease in the particle size of the active phase, an increase in the concentration of adsorbed hydrogen, which significantly increased the rate of hydroisomerization. In addition, the distinctive characteristics of the kinetic model of the reaction on the Pt-based and the Pd-based catalyst were elucidated.

Loc L.C. , Gaidai N.A. , Tri N. , Thoa D.T.K. , Kogan V.M. , Cuong H.T. , Agafonov Y.A.
Kinetics of n-hexane hydroisomerization over HZSM-5 supported platinum catalysts. Features of the process mechanism and the Ni-promoting effect
Molecular Catalysis. 2021. V.515. 111880 . DOI: 10.1016/j.mcat.2021.111880 WOS Scopus OpenAlex

Web of science:	WOS:000704082400006
Scopus:	2-s2.0-85116433647
OpenAlex:	W3200492056

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OpenAlex	5
Scopus	6
Web of science	6