title: Supported polyethylene glycol stabilized platinum nanoparticles for chemoselective hydrogenation of halonitrobenzenes in scCO2.
abstract: Polyethylene glycol stabilized platinum nanoparticles were immobilized on solid supports such as γ-Al2O3, SBA-15, TiO2 and active carbon, forming supported polyethylene glycol stabilized platinum nanoparticles (SPPNs). In the hydrogenation of p-chloronitrobenzene (p-CNB) in supercritical carbon dioxide (scCO2), the SPPN showed high selectivity to p-chloroaniline (>99.3%) in the whole range of conversion. Such high selectivity to corresponding haloanilines (HANs) (>99.1%) was also obtained in the hydrogenation of o-CNB, m-CNB, 2-chloro-6-nitrotoluene, p-bromonitrobenzene and m-iodonitrobenzene. The dehalogenation and the accumulation of intermediates were fully inhibited simultaneously in scCO2. The SPPN catalysts could be reused several times without loss of high selectivity in present reaction system.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Cheng
authors.forename: Xiangchun
authors.initials: X
authors.lastname: Meng
authors.forename: Limin
authors.initials: L
authors.lastname: He
authors.forename: Weiwei
authors.initials: W
authors.lastname: Lin
authors.forename: Fengyu
authors.initials: F
authors.lastname: Zhao
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000814:Aniline Compounds / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D004137:Dinitrochlorobenzene / Q000737:chemistry*; D006865:Hydrogenation; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D009578:Nitrobenzenes / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013237:Stereoisomerism; D014025:Titanium / Q000737:chemistry
chemical_list: D000814:Aniline Compounds; D004137:Dinitrochlorobenzene; D009578:Nitrobenzenes; C509969:SBA-15; D002245:Carbon Dioxide; C009495:titanium dioxide; D011092:Polyethylene Glycols; D010984:Platinum; D002244:Carbon; D012822:Silicon Dioxide; C010407:4-chloronitrobenzene; D014025:Titanium; D000537:Aluminum Oxide; C004658:4-chloroaniline
keywords: Chemoselective hydrogenation; Haloaniline; Halonitrobenzene; Polyethylene glycol; Supercritical carbon dioxide