title: Pd(II) immobilized on mesoporous silica by N-heterocyclic carbene ionic liquids and catalysis for hydrogenation.
abstract: In this work we synthesized Pd(II) immobilized on mesoporous silica by N-heterocyclic carbene (NHC) ionic liquids (ILs) with different alkyl chain lengths. The catalysts were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), low-angle X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and nitrogen sorption. The catalysts were used for the hydrogenation of alkenes and allyl alcohol. The results indicated that the catalysts were very active, selective, and stable. The selectivity for the hydrogenation of allyl alcohol to 1-propanol increased with the increase of the alkyl chain length of the ILs. The effect of supercritical CO(2) (scCO(2)) on the hydrogenation of allyl alcohol was also studied, and it was demonstrated that scCO(2) could enhance the selectivity of the reaction considerably. The XPS study showed that the valence of Pd(II) remained unchanged under hydrogenation conditions.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Minqiang
authors.initials: M
authors.lastname: Hou
authors.forename: Tianbin
authors.initials: T
authors.lastname: Wu
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.forename: Honglei
authors.initials: H
authors.lastname: Fan
authors.forename: Guanying
authors.initials: G
authors.lastname: Yang
authors.forename: Buxing
authors.initials: B
authors.lastname: Han
mesh_terms: D002384:Catalysis; D006865:Hydrogenation; D052578:Ionic Liquids; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D010165:Palladium / Q000737:chemistry* / Q000378:metabolism*; D056951:Photoelectron Spectroscopy; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D052578:Ionic Liquids; C030011:carbene; D010165:Palladium; D012822:Silicon Dioxide; D008697:Methane