Effect of Surface-treatment Additive on Particle Characteristics and Catalytic Activity of Molybdenum Sulfide Prepared by Wet Comminution
| Autor: | Akihiro Gotoh, Kazuo Shimada, Fumikazu Ikazaki, Kunio Uchida, Yasunori Kuriki, K. Kamiya, Akiko Kawai, Hiroshi Hayakawa |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Journal of the Society of Powder Technology, Japan. 38:600-606 |
| ISSN: | 1883-7239 0386-6157 |
| DOI: | 10.4164/sptj.38.600 |
| Popis: | We investigated the effect of oleic acid as an additive on particle characteristics and catalytic activities of molybdenum sulfide prepared by a wet comminution in n-decane for 10 hours. A mediaagitating mill was used in the wet comminution. The amount of oleic acid added to molybdenum sulfide in n-decane varied from 0 to 1.6mmol/g. Size distribution of molybdenum sulfide particles, BET specific surface by nitrogen gas physical adsorption (SN2), specific surface area by hydrogen gas chemical adsorption (SH2), chemical composition, and FT-IR diffuse reflectance spectra were measured. Hydrogenation (HY) of 1-methylnaphthalene (1-MN) and hydrodesulfurization (HDS) of dibenzothiophene (DBT) were evaluated as model reactions of catalytic activity.Median diameter of molybdenum sulfide particles prepared by the wet comminution decreased with increasing oleic acid except in the case of 1.6mmol/g, being smaller than 100nm in all cases. Both BET specific surface area (SN2) and the specific surface area from H2 chemical adsorption (SH2) decreased with increasing oleic acid, and the ratio, SH2/SN2, was about 0.1 in all the comminution conditions. The diffuse reflectance spectra showed that oleic acid was physically adsorbed on molybdenum sulfide. Hydrogenation (HY) of 1-MN and hydrodesulfurization (HDS) of DBT also decreased with increasing oleic acid, showing a negative correlation between the catalytic activity and the amount of oleic acid added in n-decane. |
| Databáze: | OpenAIRE |
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