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Phenol and dihydroxybenzene hydrogenation catalysts based on polyamide dendrimers and rhodium species
Abstract Heterogeneous catalysts based on rhodium nanoparticles and first- and second-generation poly(amidoamine) (PAMAM) dendrimers crosslinked with hexamethylene diisocyanate have been synthesized. It has been found that catalyst samples with a particle size of 0.88 to 1.96 nm, depending on the PAMAM dendrimer generation, are effective in the hydrogenation of phenol, hydroquinone, resorcinol, and pyrocatechol (85°C, 30 atm O2, 2 h). In phenol hydrogenation, the selectivity for cyclohexanone is 100%. Cyclohexanone has not undergone further transformation under the reaction conditions. The main products of dihydroxybenzene hydrogenation have been trans-cyclohexanediols, with their proportion decreasing in the order: resorcinol > hydroquinone > pyrocatechol. The selectivity has been found to be 100% for 1,3-cyclohexanediol, 97–99% for 1,4-cyclohexanediol, and 33–91% for 1,2-cyclohexanediol. The catalysts based on the second-generation dendrimer have shown a high activity in dihydroxybenzene hydrogenation (TOF of 6600 to 35000 h−1).
Phenol and dihydroxybenzene hydrogenation catalysts based on polyamide dendrimers and rhodium species
Abstract Heterogeneous catalysts based on rhodium nanoparticles and first- and second-generation poly(amidoamine) (PAMAM) dendrimers crosslinked with hexamethylene diisocyanate have been synthesized. It has been found that catalyst samples with a particle size of 0.88 to 1.96 nm, depending on the PAMAM dendrimer generation, are effective in the hydrogenation of phenol, hydroquinone, resorcinol, and pyrocatechol (85°C, 30 atm O2, 2 h). In phenol hydrogenation, the selectivity for cyclohexanone is 100%. Cyclohexanone has not undergone further transformation under the reaction conditions. The main products of dihydroxybenzene hydrogenation have been trans-cyclohexanediols, with their proportion decreasing in the order: resorcinol > hydroquinone > pyrocatechol. The selectivity has been found to be 100% for 1,3-cyclohexanediol, 97–99% for 1,4-cyclohexanediol, and 33–91% for 1,2-cyclohexanediol. The catalysts based on the second-generation dendrimer have shown a high activity in dihydroxybenzene hydrogenation (TOF of 6600 to 35000 h−1).
Phenol and dihydroxybenzene hydrogenation catalysts based on polyamide dendrimers and rhodium species
Zakharyan, E. M. (Autor:in) / Ma, Gouqiung (Autor:in) / Maksimov, A. L. (Autor:in) / Karakhanov, E. A. (Autor:in) / Voronina, Z. D. (Autor:in)
Petroleum Chemistry ; 54 ; 412-419
01.11.2014
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2018
| British Library Online Contents | 2018
Rhodium catalysts for the hydrogenation of benzene and its homologues in various solvents
| Springer Verlag | 2010