ChemInform Abstract: Conversion of Methanol to Hydrocarbons on Modified High-Silica Zeolite Catalysts.

Zeolite Beta, synthesized in 1967 (1), is the first example of a large pore, high silica zeolite (SiO2O3 > 20) prepared in the presence of an organic template (Tetraethylammonium Hydroxide). Zeolite NU-2, whose synthesis has been reported in 1982 (2) seems to be related to the zeolite Beta. Although Zeolite Beta has been claimed as useful catalyst in hydrocracking (3), cracking (4), dewaxing (5), hydrotreating (6), shale oil (7) and Fisher-Tropsh products (B) conversions and as a selective adsorbent in the separation of alkylaromatics (9); this zeolite has not been extensively characterized in the open literature.

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Carbonization of high-silica zeolites during the conversion of methanol to hydrocarbons

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science ◽

10.1007/bf00954004 ◽

1986 ◽

Vol 35 (9) ◽

pp. 1785-1789

Author(s):

Yu. V. Ryabov ◽

V. I. Erofeev

Keyword(s):

Methanol To Hydrocarbons ◽

High Silica ◽

High Silica Zeolites

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Elucidating the reaction pathway for ethene and propene formation in the methanol-to-hydrocarbons reaction over high silica H-Beta

Catalysis Science & Technology ◽

10.1039/c7cy00288b ◽

2017 ◽

Vol 7 (11) ◽

pp. 2194-2203 ◽

Cited By ~ 7

Author(s):

Jie Zhang ◽

Zhihua Huang ◽

Peidong Li ◽

Xiaomin Zhang ◽

Xinzhi Zhang ◽

...

Keyword(s):

Reaction Pathway ◽

Methanol Conversion ◽

Methanol To Hydrocarbons ◽

High Silica

High silica H-Beta exhibits high propene selectivity in methanol conversion due to the participation of an olefins-based cycle and domination of higher methylbenzenes in an aromatics-based cycle.

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Acidic and Catalytic Properties of Zeolites Modified by Zinc in the Conversion Process of Lower C3–C4 Alkanes

Catalysts ◽

10.3390/catal9050421 ◽

2019 ◽

Vol 9 (5) ◽

pp. 421

Author(s):

Vladimir Erofeev ◽

Vyacheslav Khasanov ◽

Sofia Dzhalilova ◽

Wladimir Reschetilowski ◽

Anna Syskina ◽

...

Keyword(s):

Zinc Oxide ◽

Catalytic Properties ◽

Zeolite Catalysts ◽

Conversion Process ◽

Additive Concentration ◽

Liquid Hydrocarbons ◽

Mfi Zeolite ◽

Acid Properties ◽

Alcohol Fraction ◽

High Silica

The acid and catalytic properties of the modified MFI zeolite catalysts during the conversion of the propane–butane fraction of the associated petroleum gases into the aromatic hydrocarbons were studied. It was established that the high-silica zeolites synthesized with the new structure-forming additive of the alcohol fraction (ZKE-AF) belong to the high-silica MFI zeolites. The resulting zeolites were modified by 1–5 wt. % additives consisting of zinc oxide and sulfide. The influence of the modifying additive concentration containing zinc oxides and sulfides in an amount of 1–5% on the acid and catalytic properties of the catalysts in the conversion process of lower C3–C4 alkanes into liquid hydrocarbons was studied. The research of the acid properties of the modified zeolite catalysts by thermal desorption of ammonia showed that the total concentrations of the acidic centers of H-ZKE-AF modified by 3% and 5% ZnO increased. It was found that the highest yield of liquid hydrocarbons was on the zeolite catalysts modified by 3% and 5% ZnS, and is 60.6% and 60.5%, respectively, which is 9% more than in the initial H-ZKE-AF. The activity of the zeolite catalysts modified by zinc oxide and zinc sulfide was in correlation with their acid properties.

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Conversion of the Propane–Butane Fraction into Arenes on MFI Zeolites Modified by Zinc Oxide and Activated by Low-Temperature Plasma

Molecules ◽

10.3390/molecules25112704 ◽

2020 ◽

Vol 25 (11) ◽

pp. 2704

Author(s):

Vladimir I. Erofeev ◽

Sofiya N. Dzhalilova ◽

Mikhail V. Erofeev ◽

Vasilii S. Ripenko ◽

Vladimir P. Reschetilowski

Keyword(s):

Aromatic Hydrocarbons ◽

Maximum Yield ◽

Acid Sites ◽

Zeolite Catalysts ◽

Silica Gels ◽

Mfi Zeolite ◽

Temperature Plasma ◽

High Silica ◽

Mfi Zeolites ◽

Propane Butane

The effect of modification of MFI zeolite 1–5 wt.% ZnO activated by plasma on acid and catalytic properties in the conversion of the propane–butane fraction into arenes was investigated. The high-silica zeolites with silicate module 45 were synthesized from alkaline alumina–silica gels in the presence of an ‘X-oil’ organic structure-forming additive. The modification of the zeolite with zinc was carried out by impregnating the zeolite granules in the H-form with an aqueous solution of Zn(NO3)2. The obtained zeolites were characterized by X-ray phase analysis and IR spectroscopy. It is shown that the synthesized zeolites belong to the high-silica MFI zeolites. The study of microporous zeolite-containing catalysts during the conversion of C3-C4 alkanes to aromatic hydrocarbons made it possible to establish that the highest yield of aromatic hydrocarbons is observed on zeolite catalysts modified with 1 and 3% ZnO and amount to 63.7 and 64.4% at 600 °C, respectively, which is 7.7–8.4% more than on the original zeolite. The preliminary activation of microporous zeolites modified with 1–5% ZnO and plasma leads to an increase in the yield of aromatic hydrocarbons from the propane–butane fraction; the maximum yield of arenes is observed in zeolite catalysts modified with 1 and 3% ZnO and activated by plasma, amounting to 64.9 and 65.5% at 600 °C, respectively, which is 8.9–9.5% more than on the initial zeolite. The activity of the zeolite catalysts modified by ZnO and activated by plasma show good agreement with their acid properties. Activation of the zeolites modified by 1 and 3% ZnO and plasma leads to an increase in the concentration of the weak acid sites of the catalyst to 707 and 764 mmol/g in comparison with plasma-inactivated 1 and 3% ZnO/ZKE-XM catalysts at 626 and 572 mmol/g, respectively.

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