CoMo Sulfide Catalysts Supported on Natural Halloysite Nanotubes: Dealumination as an Effective Approach to Improve Catalytic Performance

IF 1.3 4区工程技术 Q3 CHEMISTRY, ORGANIC

Petroleum Chemistry Pub Date : 2024-07-08 DOI:10.1134/s0965544124030071

N. A. Vinogradov, V. I. Elizarova, A. V. Vutolkina, A. A. Pimerzin, A. P. Glotov

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Abstract

–CoMo sulfide catalysts supported on aluminosilicate halloysite nanotubes (CoMoS/HNT) and on dealuminated halloysite nanotubes (CoMoS/HNT(deAl)) were synthesized by incipient wetness impregnation using pseudoboehmite as a binder. Both the supports and related catalysts were characterized by low-temperature nitrogen adsorption, energy dispersive X-ray fluorescence analysis, temperature-programmed reduction by hydrogen, FTIR spectroscopy of adsorbed pyridine, transmission electron microscopy, and X-ray photoelectron spectroscopy. The catalyst samples were further tested in hydrotreating of diesel feedstocks. Dealumination of halloysite was found to increase the area of Si-enriched surface segments, thus weakening interaction between the sulfide phase and the support and, hence, increasing the content of highly active sulfide particles. In the case of a mixed feedstock, CoMoS/HNT(deAl) + Al₂O₃ achieved a reaction rate constant of 0.605 ppm S^–0.4/g(L^–0.4 h) compared to 0.429 ppm S^–0.4/g(L^–0.4 h) for an alumina-supported sample.

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以天然霍洛石纳米管为载体的硫化钴催化剂：脱铝是提高催化性能的有效方法

摘要-以假波长莫来石为粘合剂，通过初湿浸渍法合成了硅酸铝埃洛石纳米管（CoMoS/HNT）和脱铝埃洛石纳米管（CoMoS/HNT(deAl)）支撑的硫化钴催化剂。通过低温氮吸附、能量色散 X 射线荧光分析、氢气的温度编程还原、吸附吡啶的傅立叶变换红外光谱、透射电子显微镜和 X 射线光电子能谱对支撑物和相关催化剂进行了表征。催化剂样品在柴油原料的加氢处理中进行了进一步测试。研究发现，埃洛石的脱焙烧增加了富含硫的表面片段的面积，从而削弱了硫化物相与支撑物之间的相互作用，因此增加了高活性硫化物颗粒的含量。在混合原料的情况下，CoMoS/HNT(deAl) + Al2O3 的反应速率常数为 0.605 ppm S-0.4/g(L-0.4 h)，而氧化铝支撑样品的反应速率常数为 0.429 ppm S-0.4/g(L-0.4 h)。

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来源期刊

Petroleum Chemistry 工程技术-工程：化工

CiteScore

2.50

自引率

21.40%

发文量

102

审稿时长

6-12 weeks

期刊介绍： Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.