Abstract
Carbon nanotubes (CNTs)-supported Pt nanoparticles were prepared with selective deposition of Pt nanoparticles inside and outside CNTs (Pt–in/CNTs and Pt–out/CNTs). The effects of Pt loading and reaction solvents on phenol hydrogenation were investigated. The Pt nanoparticles in Pt–in/CNTs versus Pt–out/CNTs are smaller and better dispersed. The catalytic activity and reuse stability toward phenol hydrogenation both improved markedly. The dichloromethane–water mixture as the reaction solvent, compared with either pure medium, decreased the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt–in/CNTs, but significantly improved the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt–out/CNTs.
Highlights
Hydrogenation of phenol to cyclohexanone or cyclohexanol is an important chemical reaction in the production of nylon and polyamide resins [1]
It is widely accepted that the hydrogenation of phenol mainly occurs between the phenol chemisorbed on the support and the hydrogen activated on metal nanoparticles
Compared with pure dichloromethane, when the mixed medium contained 10 wt % water, the phenol conversion of Pt–imp/Carbon nanotubes (CNTs) increased from 33.8% to 86.0%, and the corresponding selectivity of cyclohexanone rose from 75.3% to 99.4%
Summary
Hydrogenation of phenol to cyclohexanone or cyclohexanol is an important chemical reaction in the production of nylon and polyamide resins [1]. Yang et al [6] reported the high catalytic activity and cyclohexane selectivity of Pt/titanate nanotubes in phenol hydrogenation, even at 327 K. [15] reported reported that the hydrophilic carbon-supported carbon-supported Pd catalyst showed catalyst These results results suggest suggest that that the very high cyclohexanone cyclohexanone selectivity in in phenol phenol hydrogenation. These affect thethe catalytic properties of CNTs-supported metal hydrophilicity/hydrophobicity of of CNTs. CNTscould could affect catalytic properties of CNTs-supported catalysts for phenol hydrogenation. The catalysts catalysts with with active particles particles loaded loaded inside inside and and outside outside CNTs exhibit distinctly different catalytic performances. (i.e., Ru, Ru, Co, and Fe) encapsulated catalytic inside CNTs exhibit superior catalytic performance performance compared compared with with those those loaded loaded outside outside CNTs. Fischer-Tropsch synthesis [18,19], andand polymerization [20]. By considering hydrophilicity/hydrophobicityofof CNTs, CNTs, reactants, reactants, and and products, products, we we studied studied the the effect effect of of a the hydrophilicity/hydrophobicity catalysts toward toward phenol phenol hydrogenation
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