Journal of the Brazilian Chemical Society | |
Iridium Catalysts for C-C and C-O Hydrogenolysis: Catalytic Consequences of Iridium Sites | |
Passos, Fabio B.1 Florez-Rodriguez, Pedro P.1 Pamphile-Adrián, Aracelis J.1 Universidade Federal Fluminense, Niterói, Brazil1 | |
关键词: Â iridium catalysts; hydrogenolysis; C-C cleavage; C-O cleavage; support effect; | |
DOI : 10.5935/0103-5053.20150354 | |
学科分类:化学(综合) | |
来源: SciELO | |
【 摘 要 】
The support effect on the properties of iridium catalysts for C-C and C-O hydrogenolysis was investigated. Cyclohexane conversion and glycerol hydrogenolysis were used to compare the behavior of iridium catalysts in terms of C-C and C-O cleavage. The nature of the support influenced the catalyst performance in both cyclohexane conversion and glycerol hydrogenolysis. This effect was more evident on the product selectivity. Ir/SiO2 catalyst presented the highest cyclohexane hydrogenolysis activity and the highest selectivity to minor hydrocarbons formed from hexane re-adsorption. For glycerol hydrogenolysis, all catalysts displayed a higher selectivity to products formed by C-O cleavage, mainly 1,2-propanediol (1,2-PDO). Ir/ZrO2 catalyst presented the highest activity in all reaction conditions and the lowest selectivity to minor alcohols produced by C-C cleavage like methanol, ethanol and ethylene glycol. The results were explained in terms of the requirements and the structure of the catalytic sites.
【 授权许可】
Unknown
【 预 览 】
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RO201912050582753ZK.pdf | 1108KB | download |