Presence Of Aluminosilicate Catalyst Research Articles

Физико­-химические методы исследования и использование природных алюмосиликатных катализаторов, модифицированных переходными металлами

The article presents the main results of methods for modifying natural aluminosilicates (Az-4 and halloisite) with transition metals (Ni, Mo) using a CVD (Chemical Vapor Deposition) setup and physicochemical methods for studying the obtained catalysts. It was found that the elements Mo and Ni in the surface layers of the catalysts obtained as a result of the modification of both natural aluminosilicates by the ion exchange method were more distributed than the elements modified by the impregnation method. During the hydrocracking of fuel oil in the presence of aluminosilicate catalysts, 80-83% of the volume of light oil products (gasoline, diesel fractions) was obtained.

Study the pressure effect on hydrocracking process of vacuum gasoil

The paper presents the results of study on the pressure effect on hydrocracking process of vacuum gasoil from the mixture of Baku oils with the presence of aluminosilicate catalyst modified Ni, Mo. Hydrocracking of vacuum gasoil in the presence of aluminosilicate catalyst, modified Ni, Mo has been carried out in 3−8 MPa pressure in the temperature interval of 400−450 оС with the speed of 0.7−2.0 h-1 on Hungarian unit with reactor capacity in 200 ml. The pressure effect on the hdyrocracking process has been studied in the diapason of 3-8 MPa. It was defined that while the pressure is increasing from 3 to 5 MPa, the yield of diesel fraction also increases from 35 to 44 % mass. The pressure increase from 5 to 8 MPa increases the yield of diesel fraction for 48 %, i.e. the growth of only for 4 % is observed. It was considered practical to conduct hydrocracking process in 5MPa, as the pressure increase from 5 to 8 MPa leads to the significant increase of capital expenses.

PERFORMANCE OF ACIDIC MCM-LIKE ALUMINOSILICATE CATALYSTS IN PYROLYSIS OF POLYPROPYLENE

Mesoporous aluminosilicate catalysts having different Al/Si ratios were synthesized following a hydrothermal synthesis route and using different aluminum sources, such as aluminum nitrate and aluminum isopropoxide. These mesoporous materials have high surface areas, in the range of 520–1001 m2/g, and exhibit Type IV nitrogen adsorption isotherms. EDS and 27Al MAS NMR results showed that aluminum was incorporated more effectively into the structure of the catalyst forming a tetrahedral framework when aluminum nitrate was used as the aluminum source. The activities of these catalysts in the polypropylene pyrolysis reaction were tested in a TGA apparatus. Results showed a marked reduction in the degradation temperature in the presence of aluminosilicate catalysts. The activation energy of degradation was 172 kJ/mole without any catalyst. However, using the mesoporous aluminosilicate catalysts synthesized by using aluminum nitrate as the aluminum source, activation energy of the degradation reaction decreased to values of about 24–28 kJ/mole.

ChemInform Abstract: Reactions of Some Terpenes and Their Derivatives with Acylating Agents in the Presence of Aluminosilicate Catalysts.

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Reactions of some terpenes and their derivatives with acylating agents in the presence of aluminosilicate catalysts

Reactions of camphene, α-fenchene, limonene, caryophyllene, α- and β-pinenes, verbenol, walterol, and verbenone with acylating agents in the presence of clay K-10 and wide-porous β-zeolite were studied. Presumable schemes and rules of the occurring processes were considered.

Preparation of trimethylbenzenes

1. The intermolecular methyl group redistribution of xylenes in the presence of aluminosilicate catalyst has been studied. 2. The effect of various factors on the process has been studied, and it has been established that under optimum conditions (temperature, 450°C; pressure, 15 atm; and raw material feed rate, 0.5 h−1) the yield of trimethylbenzenes based on crude passed through mounted to 22.4–23.3%; among them were mesitylene, 5.6–5.8%; pseudocumene, 15.7–16.3%; and hemimellitene, 1.1–1.2%. The selectivity of the reaction for disproportionation attains 86%. 3. It has been shown that distillation of a mixture of trimethylbenzenes in a 40–50 theoretical plate column at a reflux ratio of 25∶1 to 30∶1 allows isolation of 96–97% pure pseudocumene and approximately 90% pure mesitylene.