Citation: Svetlana A. Yashnik, Vadim V. Kuznetsov, Zinfer R. Ismagilov. Effect of χ-alumina addition on H₂S oxidation properties of pure and modified γ-alumina[J]. Chinese Journal of Catalysis, ;2018, 39(2): 258-274. doi: 10.1016/S1872-2067(18)63016-5 shu

Effect of χ-alumina addition on H₂S oxidation properties of pure and modified γ-alumina

a Boreskov Institute of Catalysis SB RAS, Lavrentieva, 5, Novosibirsk 630090, Russia;
b Institute of Coal Chemistry and Materials Science FRC CCC, SB RAS, Sovetskii, 18, Kemerovo 650000, Russia

Received Date: 31 October 2017
Revised Date: 11 December 2017

The influence of the textural and acidic properties of γ-Al₂O₃, (γ+χ)-Al₂O₃, and α-Al₂O₃ on the catalytic activity, selectivity, and stability of direct H₂S oxidation has been studied. A comparison of the H₂S-to-S conversion effectiveness of aluminas with their acidic properties (identified by Fourier transform infrared spectroscopy and temperature programmed desorption of NH₃) shows that H₂S adsorption occurs predominantly on weak Lewis acid sites (LAS). γ-Alumina samples containing a χ-phase and/or modified Mg²⁺ ions have a greater concentration of weak LAS and exhibit greater catalytic activity. When alumina is treated with a sulfuric acid solution, strong LAS appear and the number of LAS decreases significantly. Modification of alumina with hydrochloric acid has a limited effect on LAS strength. Weak LAS are retained and double in number compared to that present in the unmodified alumina, but the treated sample has Al-Cl bonds. Alumina samples modified by sulfate and chloride anions exhibit poor catalytic activity in H₂S oxidation.
- Alumina,
- χ-Al₂O₃,
- Hydrogen sulfide oxidation,
- Acidic property,
- Lewis acid sites,
- Fourier transform infrared spectroscopy,
- NH₃-temperature programmed desorption
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通讯作者: 陈斌, bchen63@163.com

Effect of χ-alumina addition on H₂S oxidation properties of pure and modified γ-alumina