Hydrodesulfurization of alkyldibenzothiophenes: Evidence of highly unreactive aromatic sulfur compounds

被引:95
作者
Macaud, M
Milenkovic, A
Schulz, E
Lemaire, M
Vrinat, M
机构
[1] Inst Rech Catalyse, F-69626 Villeurbanne, France
[2] UCBL, CPE, IRC, Lab Catalyse & Synth Organ, F-69622 Villeurbanne, France
关键词
hydrodesulfurization; hydrogenation; alkyldibenzothiophenes; kinetics;
D O I
10.1006/jcat.2000.2897
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Various dialkyldibenzothiophenes containing methyl, ethyl, diisobutyl, and diisopropyl substituents in the fourth and sixth positions were synthesized and their reactivities compared over an NiMo/Al2O3 industrial catalyst. Studies were made in a batch reactor at 573 K and at a total pressure of 5 MPa, Kinetic studies and competitive reactions demonstrated that adsorption on the surface of the catalyst was not the rate-determining step for their transformation. Hydrodesulfurization was proposed to proceed via a network of parallel reactions after partial hydrogenation of one aromatic ring of the sulfur compound. Variations in the reactivities of the different dibenzothiophene derivatives are well correlated to the steric hindrance generated by the alkyl groups near the sulfur atom. Moreover, 4,6-diisopropyldibenzothiophene showed very low reactivity, and the steric effect led to the disappearance of desulfurization under our reaction conditions. (C) 2000 Academic Press.
引用
收藏
页码:255 / 263
页数:9
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