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Rh nanoparticles stabilized by PEG-substituted triphenyl-phosphine(PETPP,P[C6H4-p-(OCH2CH2)nOH]3)combining double stabilization effects demonstrated high activity and good recyclability in aqueous biphasic hydrogenation of benzene.The value of turnover frequency(TOF)was 3333 h-1.Furthermore,the rhodium nanoparticle catalyst could be easily recycled for five times without loss in activity.