Catalysis by crystalline aluminosilicates I. Cracking of hydrocarbon types over sodium and calcium ?X? zeolites

Frilette, Vincent J

doi:10.1016/0021-9517(62)90057-x

Cited by 48 publications

(6 citation statements)

References 11 publications

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“…ZSM-5 is a well-known zeolite with solid acid sites that has been developed for and is widely used in chemical and petroleum industrial processes such as isomerization, alkylation and hydrocracking. [9,10] The strong acid sites make ZSM-5 a promising candidate for aromatization of olefins. [11,12] Another advantage of ZSM-5 zeolite is its thermal stability and unique pore structure.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Performance of Zn‐containing HZSM‐5 upon Selective Desilication in Ethane Dehydroaromatization Process

et al. 2020

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The effect of introducing mesoporosity on the catalytic stability and selectivity of Zn‐containing ZSM‐5 catalysts was investigated for direct conversion of ethane to high‐value aromatics. Voids and mesopores were created in the zeolite (Si/Al=40) by selective desilication (recrystallization) using ammonium hydroxide and cetyltrimethylammonium bromide. Zinc was incorporated in the samples by incipient wetness impregnation to achieve different concentrations of 0.5, 1 and 5 wt %. The samples were characterized by XRD, N2 physisorption, TGA, NH3‐TPD, ICP‐OES, FTIR, 1H, 27Al and 29Si solid‐state MAS NMR. The desilicated samples were compared to their parent analogues for ethane conversion to aromatics such as benzene, toluene and xylenes (BTX). All of the desilicated samples showed an improvement in BTX yield and catalytic stability. Thus, the presence of mesoporosity increases the accessibility to the active sites and facilitates the mass transfer of aromatic compounds, which result in higher performance and catalytic stability of the desilicated ZSM‐5 samples containing zinc.

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Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Performance of Zn‐containing HZSM‐5 upon Selective Desilication in Ethane Dehydroaromatization Process

et al. 2020

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“…^here is currently considerable interest in the use of molecular sieves (crystalline aluminosilicates) as catalysts in the petroleum and petrochemical industry, and since Weisz, Frilette, and coworkers first reported cracking, alcohol dehydration, and hydrogenation using zeolite catalysts (Frilette et al, 1962;Weisz and Frilette, 1960; Weisz et al, 1962), the field has rapidly expanded. The zeolites are unusual in that their intracrystalline active sites are accessible only to molecules whose size and shape permit sorption through the entry pores.…”

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confidence: 99%

Reverse Molecular-Size Selectivity and Aging in Zeolite-Catalyzed Alkylation

Venuto¹,

Hamilton²

1967

I&EC Product Research and Development

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“…There is still some enlightening information about regulation on the adsorption mode of reactants in the presence of ligands. It is well known that zeolites with regular porosity, tunable acidity, and excellent hydrothermal stability have been widely applied in petroleum refining and the petrochemical industry based upon the shape-selective catalysis. − Recently, metal nanoparticles and clusters have been encapsulated within zeolite crystals (metal@zeolite catalysts), which unveiled their participatory advantages on sintering/coke-resistance due to the shape selectivity of the zeolitic matrix and the superior activity compared to impregnated catalysts. − However, there is still a lack of general consideration on the essence of selectivity improvement. In our previous publication, we have reported hydrogenation/hydrogenolysis during phenol conversion over impregnated and encapsulated Ni-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Encapsulated Ni Nanoparticles within Silicalite-1 Crystals for Upgrading Phenolic Compounds to Arenes

Zhang

Duan

Xie

et al. 2021

Ind. Eng. Chem. Res.

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About 3−5 nm Ni nanoparticles were significantly encapsulated within different crystal sizes of a silicalite-1 matrix through tailoring the hydrothermal synthesis conditions and ratios of feeding materials, which were applied in the upgrading of phenolic compounds to arenes via the hydrogenolysis route. The smaller the sizes of Ni@silicalite-1 crystals with similar Ni contents and nanoparticles, the more obvious the active centers could be characterized. The enhancement in both phenol/m-cresol conversion and benzene/toluene selectivity was obtained with the decrease in crystal sizes of Ni@silicalite-1, which originated from the selective elimination of the hydroxyl group, hindrance of further hydrogenation of aromatics, and the formation of methane.

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Catalysis by crystalline aluminosilicates I. Cracking of hydrocarbon types over sodium and calcium ?X? zeolites

Cited by 48 publications

References 11 publications

Enhanced Catalytic Performance of Zn‐containing HZSM‐5 upon Selective Desilication in Ethane Dehydroaromatization Process

Enhanced Catalytic Performance of Zn‐containing HZSM‐5 upon Selective Desilication in Ethane Dehydroaromatization Process

Reverse Molecular-Size Selectivity and Aging in Zeolite-Catalyzed Alkylation

Encapsulated Ni Nanoparticles within Silicalite-1 Crystals for Upgrading Phenolic Compounds to Arenes

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