A new way to obtain acid or bifunctional catalysts

Montes, A.; Giannetto, G.

doi:10.1016/s0926-860x(99)00530-x

Cited by 35 publications

(10 citation statements)

References 43 publications

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“…47 Among them, the dehydrogenation of propane is one of most critical 30 process of propane aromatization. 1 Generally, it is thought that the acidity of the metal-modified zeolite catalyst is quite an important and relevant factor affecting catalytic activity in heterogeneous catalysis reactions.…”

Section: Discussionmentioning

confidence: 99%

“…Propane aromatization contains a series of processes: olefin formation through dehydrogenation of propane to propene, oligomerization of olefins, subsequent cracking (olefin interconversion), formation of new oligomers through olefin alkylation followed by a hydrogen transfer and/or dehydrogenation, and cyclization and aromatization. 47 Among them, the dehydrogenation of propane is one of most critical process of propane aromatization. 1 Generally, it is thought that the acidity of the metal-modified zeolite catalyst is quite an important and relevant factor affecting the catalytic activity in heterogeneous catalysis reactions.…”

Section: Discussionmentioning

confidence: 99%

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A highly efficient Ga/ZSM-5 catalyst prepared by formic acid impregnation and in situ treatment for propane aromatization

Xiao

Zhang

Wang

et al. 2015

Catal. Sci. Technol.

112

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A simple method for the preparation of a Ga/ZSM-5 catalyst for propane aromatization was established by formic acid impregnation and in-situ treatment. The catalyst prepared by this novel method showed remarkably superior activity of propane aromatization. Under the conditions: T = 540 °C, P = 100 kPa, WHSV = 6000 ml/(g·h) and with a N 2 /C 3 H 8 molar ratio of 2, the highest propane conversion and 10 selectivity of BTX (benzene, toluene and xylene) on H-Ga/SNSA catalyst achieved was 53.6% and 58.0% respectively, much higher than that of the catalyst prepared using traditional impregnation method (38.8% and 48.2%). The catalysts were characterized by nitrogen physical adsorption, ICP-AES, DRIFT, Py-FTIR, NH 3 -TPD, H 2 -TPR, XPS and 27 Al MAS NMR techniques. The characterization data indicated that this facile methodology enhanced the dispersion of Ga species and promoted the formation of highly 15 dispersed (GaO) + species, which could exchange acidic protons (Brønsted acid sites) of the zeolite framework contributing to the strong Lewis acidity. The super catalytic behavior was attributed to the synergistic effect between strong Lewis acid sites generated by the (GaO) + species and the Brønsted acid sites. 75

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A highly efficient Ga/ZSM-5 catalyst prepared by formic acid impregnation and in situ treatment for propane aromatization

Xiao

Zhang

Wang

et al. 2015

Catal. Sci. Technol.

112

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“…However, a concrete description of the sequential bifunctional pathway is still up for debate. It is generally accepted that the Ga species take part in all dehydrogenation reactions, such as the dehydrogenation of propane into propene and the transformation of alkenes into dienes and finally into aromatics, as involved in the propane aromatization process [74]. In contrast, Iglesia et al simultaneously measured the rates of C-H activation, recombinative hydrogen desorption, and propane dehydrogenation by using isotopic redistribution and chemical conversion data obtained from C 3 H 8 /C 3 D 8 and D 2 /C 3 H 8 mixtures.…”

Section: Perspective: Challenges and Opportunitiesmentioning

confidence: 99%

Direct conversion of methane under nonoxidative conditions

Bao

Lin

2003

Journal of Catalysis

294

184

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“…Light alkanes aromatization reaction contains a set of processes: olefins formation through alkane dehydrogenation (containing cracking), oligomerization of olefins, subsequent olefins interconversion, formation of new oligomers through olefins alkylation followed by hydrogen transfer, dehydrogenation, cyclization and aromatization [6] . ZSM‐5 zeolite is recognized as a promising solid acidic catalyst for light alkanes aromatization.…”

Section: Introductionmentioning

confidence: 99%

Propane Aromatization Tuned by Tailoring Cr Modified Ga/ZSM‐5 Catalysts

Tan

et al. 2021

ChemCatChem

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Accelerating propane dehydrogenation in propane aromatization is vital because it is the first and rate control step. In this study, we introduced Cr to Ga/ZSM‐5 by tuning its impregnation sequence and amount, which was expected to accelerate the dehydrogenation step and improve aromatization performance. The impregnation sequence of Cr on catalyst not only affected the interaction between Ga and ZSM‐5, but also tuned the amount of dehydrogenation active species Cr3+. Due to the plenty of Cr3+ species and strong interaction between Ga species and ZSM‐5, 2Cr/GaZ5 catalyst accelerated the dehydrogenation step and improved the aromatization process. More light hydrocarbons were preferred to be produced and were further converted into BTX on 2Cr/GaZ5 catalyst. Excessive Cr on catalyst caused the formation of Cr2O3 particles with worse dispersion. The aggregated Cr2O3 decreased the strong acidity of catalyst, which could not further promote propane conversion and decreased the aromatization ability of catalyst.

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A new way to obtain acid or bifunctional catalysts

Cited by 35 publications

References 43 publications

A highly efficient Ga/ZSM-5 catalyst prepared by formic acid impregnation and in situ treatment for propane aromatization

A highly efficient Ga/ZSM-5 catalyst prepared by formic acid impregnation and in situ treatment for propane aromatization

Direct conversion of methane under nonoxidative conditions

Propane Aromatization Tuned by Tailoring Cr Modified Ga/ZSM‐5 Catalysts

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