scholarly journals Physicochemical and Catalytic Properties of Rhenium-Containing Zeolites in the Course of Straight-Run Gasoline Upgrading

2021 ◽  
Vol 14 (3) ◽  
pp. 371-380
Author(s):  
Ludmila M. Velichkina ◽  
Keyword(s):  
Catalytic Properties ◽  
Gasoline Fraction ◽  
Zeolite Catalysts ◽  
Operating Efficiency ◽  
Mechanical Mixing ◽  
Condensation Products

Catalysts for upgrading of the straight-run gasoline fraction of oil were prepared on the basis of a ZSM‑5 zeolite via dry mechanical mixing with an ultrafine rhenium powder. It was shown how the structural and acidic characteristics of zeolite ZSM‑5 changed when it was modified with rhenium. The concentration and nature of carbon condensation products formed on the prepared catalysts during the processing of straight--run gasoline have been determined. An enhancement of operating efficiency of rhenium--containing zeolite catalysts in comparison with an unmodified zeolite was established, which consisted in increasing their capacity and reducing the rate of deactivation in the process under study

scholarly journals Effect of Acid Treatment on the Properties of Zeolite Catalyst for Straight-Run Gasoline Upgrading

2021 ◽  
Vol 1 (4) ◽  
pp. 1-1
Author(s):  
Ludmila Velichkina ◽  
◽  
Yakov Barbashin ◽  
Alexander Vosmerikov ◽  
◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Acid Treatment ◽  
Catalytic Properties ◽  
Fixed Bed ◽  
Acid Sites ◽  
Gasoline Fraction ◽  
Zeolite Catalysts ◽  
Acidic Properties

The objective of this research was to analyze the effect of different concentrations of nitric and hydrochloric acids on the structural, acidic, and catalytic properties of a post-synthetic treated ZSM-5 type zeolite at various temperatures. The properties of zeolite catalysts were determined using different methods, such as the Brunauer-Emmett-Teller (BET) method for specific surface area, temperature-programmed desorption (TPD) of ammonia method for acidic properties, and a flow-through unit with fixed bed catalyst (with upgrading straight-run gasoline fraction of oil) for catalytic activities of initial zeolite and acid-treated samples. The structural and acidic properties of both untreated and treated zeolites were investigated, and the effect of acid treatment on the catalytic properties of the samples in the course of upgrading the straight-run gasoline fraction of oil was determined. The post-synthetic treatment with aqueous nitric acid increased the specific surface area and volume of micropores of ZSM-5 zeolite, while the treatment with aqueous hydrochloric acid led to the formation of mesopores. Acid treatments of zeolite decreased the number of acid sites, mainly due to diminished concentration of low-temperature sites. The yield of liquid products in the conversion of straight-run gasoline fraction of oil, i.e., generation of high-octane gasolines with improved environmental features, was increased using acid-treated zeolites, which was due to the decrease in arene content.

Effect of magnesium on the catalytic properties of polymetallic zeolite catalysts for conversion of dimethyl ether to light olefins

2020 ◽  
Vol 298 ◽  
pp. 110087 ◽  
Author(s):  
N.V. Kolesnichenko ◽  
Е.N. Khivrich ◽  
T.K. Obukhova ◽  
Т.I. Batova ◽  
G.N. Bondarenko
Keyword(s):  
Dimethyl Ether ◽  
Catalytic Properties ◽  
Zeolite Catalysts ◽  
Light Olefins

Effect of Chemical Composition of Zeolite Catalysts on Their Catalytic Properties in Isobutane Alkylation with Butylenes

2019 ◽  
Vol 59 (7) ◽  
pp. 706-710
Author(s):  
I. M. Gerzeliev ◽  
V. A. Temnikova ◽  
O. V. Deniskin ◽  
M. N. Baskhanova ◽  
D. O. Khusaimova ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Catalytic Properties ◽  
Zeolite Catalysts ◽  
Isobutane Alkylation

Oligomerization of pent-1-ene over zeolite catalysts

2019 ◽  
Vol 19 (4) ◽  
pp. 307-315
Author(s):  
N. G. Grigoryeva ◽  
D. V. Serebrennikov ◽  
S. V. Bubennov ◽  
B. I. Kutepov
Keyword(s):  
Catalytic Properties ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Main Reaction ◽  
Reaction Products ◽  
High Concentration ◽  
Reaction Conditions ◽  
One Dimensional ◽  
Fuel Components ◽  
Channel Systems

Oligomerization of pent-1-ene is an effective process for synthesis of high-quality environmentally friendly fuel components. Catalytic properties of H-zeolites FAU, OFF, MOR, ВЕА, MTW and MFI were studied for synthesis of pentene oligomers in an autoclave at 110–200 °C. The wide-pore structure of H-Y and H-Beta (18) zeolites and the high concentration of acid sites were established to cause the high oligomerization activity to obtain 97–100 % yields of oligomers. Oligomers obtained over these catalysts comprised, depending on the reaction conditions, 30–73 % dimers, 25–50 % trimers and 2–14 % oligomers with more than three monomer units (n > 3). Fine-pore zeolites (H-ZSM-5) and zeolites with one-dimensional channel systems (H-OFF, H-MOR, H-ZSM-12) were less active to oligomerization of pent-1-ene, decenes being the main reaction products.

Structure and catalytic properties of nickel-zeolite catalysts

1968 ◽  
Vol 17 (4) ◽  
pp. 757-760
Author(s):  
A. M. Rubinshtein ◽  
Kh. M. Minachev ◽  
A. A. Slinkin ◽  
V. I. Garanin ◽  
G. A. Ashavskaya
Keyword(s):  
Catalytic Properties ◽  
Zeolite Catalysts

scholarly journals OXIDATIVE DEHYDROGENATION OF BUTYL ALCOHOLS TO THE CORRESPONDING CARBONYL COMPOUNDS OVER MODIFIED ZEOLITES

2021 ◽  
pp. 27-30
Author(s):  
Z.A. Shabanova ◽  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Carbonyl Compounds ◽  
Catalytic Properties ◽  
Zeolite Catalysts ◽  
Modified Zeolites

The catalytic properties of modified synthetic (A, X, Y) and natural (MOR, Clp) zeolites have been studied in the reactions of oxidative dehydrogenation of butyl alcohols to corresponding carbonyl com-pounds. It has been established that bimetallic zeolite catalysts show higher activity in these reactions

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