Structural and Catalytic Properties of Binary Alumina‒Amorphous Aluminosilicate Systems

IF 0.7 Q4 ENGINEERING, CHEMICAL Catalysis in Industry Pub Date : 2023-09-04 DOI:10.1134/S2070050423030030

V. P. Doronin, T. V. Bobkova, T. P. Sorokina, O. V. Potapenko, A. S. Yurtaeva, N. N. Leont’eva, T. I. Gulyaeva

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Abstract

Amorphous aluminosilicate‒alumina systems are investigated by a set of physicochemical means that includes studying the NMR ²⁷Al spectra of solid samples and the acidity of catalysts via ammonia temperature-programmed desorption, a structural X-ray diffraction study, and a thermogravimetric analysis of samples. Studying the catalytic properties of samples under the conditions of cracking on a model feedstock of n-dodecane in a mixture with 2-methylthiophene shows that the conversion of feedstock grows in the order 100% Al₂O₃ (AHO) > 70% Al‒Si + 30% Al₂O₃ (AHO) > 30% Al‒Si + 70% Al₂O₃ (AHO) > 100% Al‒Si (where AHO is the aluminum hydroxide of sulfate synthesis, and Al‒Si is an amorphous aluminosilicate). Raising the calcination temperature of samples from 500 to 700°C reduces the conversion of feedstock. Increasing the contribution from hydrogen transfer reactions leads to an increase improves the selectivity toward hydrogen sulfide and lowers the content of sulfur compounds in the liquid products.

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二元氧化铝-非晶铝硅酸盐体系的结构与催化性能

无定形铝硅酸盐-氧化铝体系通过一系列物理化学手段进行了研究，包括研究固体样品的NMR 27Al光谱和催化剂的酸度，通过氨程序升温解吸，结构x射线衍射研究和样品的热重分析。以正十二烷为模型原料，与2-甲基噻吩混合，研究了样品在裂解条件下的催化性能，结果表明，原料的转化率在100% Al2O3 (ho) >量级增长;70% Al-Si + 30% Al2O3 (AHO) >30% Al-Si + 70% Al2O3 (AHO) >100% Al-Si(其中ho是硫酸盐合成的氢氧化铝，Al-Si是无定形铝硅酸盐)。将样品的煅烧温度从500℃提高到700℃会降低原料的转化率。增加氢转移反应的贡献可以提高对硫化氢的选择性，降低液体产物中硫化物的含量。

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来源期刊

Catalysis in Industry ENGINEERING, CHEMICAL-

CiteScore

1.30

自引率

14.30%

发文量

期刊介绍： The journal covers the following topical areas: Analysis of specific industrial catalytic processes: Production and use of catalysts in branches of industry: chemical, petrochemical, oil-refining, pharmaceutical, organic synthesis, fuel-energetic industries, environment protection, biocatalysis; technology of industrial catalytic processes (generalization of practical experience, improvements, and modernization); technology of catalysts production, raw materials and equipment; control of catalysts quality; starting, reduction, passivation, discharge, storage of catalysts; catalytic reactors.Theoretical foundations of industrial catalysis and technologies: Research, studies, and concepts : search for and development of new catalysts and new types of supports, formation of active components, and mechanochemistry in catalysis; comprehensive studies of work-out catalysts and analysis of deactivation mechanisms; studies of the catalytic process at different scale levels (laboratory, pilot plant, industrial); kinetics of industrial and newly developed catalytic processes and development of kinetic models; nonlinear dynamics and nonlinear phenomena in catalysis: multiplicity of stationary states, stepwise changes in regimes, etc. Advances in catalysis: Catalysis and gas chemistry; catalysis and new energy technologies; biocatalysis; nanocatalysis; catalysis and new construction materials.History of the development of industrial catalysis.