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4403923 
Journal Article 
Remove rhodium catalysts from HNBR solution 
Xing, H; Zhou, Hao; Zhang, L; Wang, W; Yue, D 
2011 
Yes 
Advanced Materials Research
ISSN: 1022-6680 
Advanced Materials Research 
311-313 
1152-+ 
WOS:000309144500230 
Rhodium complex is excellent catalyst for nitrile-butadiene rubber homogeneous hydrogenation with difficulties in its recovery. A new extraction method for recovery noble metal catalysts from hydrogenated nitrile-butadiene rubber solution was investigated. Rhodium metal catalysts can be efficiently, easily removed from hydrogenated nitrile-butadiene rubber solution using amine as ligand and hydrogen peroxide as oxidant. The condition of removing noble metal catalysts from hydrogenated nitrile-butadiene rubber solution was carefully studied, including oxidant, reaction temperature, and the concentration of amine. The removal rate of the rhodium catalyst over 96% with the optimal conditions. H-1-NMR characterization showed that there was no change in the structure and nitrile group of hydrogenated nitrile-butadiene rubber after rhodium catalysts were removed. 
hydrogenated nitrile-butadiene rubber; hydrogen peroxide; rhodium catalyst; extractant; remove; amine