title: Transition metal complexes on mesoporous silica nanoparticles as highly efficient catalysts for epoxidation of styrene.
abstract: We have synthesized a series of catalysts for epoxidation of styrene by immobilizing salicylaldimine transition metal (copper, manganese, and cobalt) complexes on mesoporous silica nanoparticles (MSNs) with diameters of 120-150 nm. The prepared catalysts are characterized by infrared (IR) spectra, thermal gravimetric analyses (TGA), inductively coupled plasma (ICP), CHN elemental analysis, nitrogen adsorption-desorption, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). These catalysts possess excellent catalytic efficiency in epoxidation of styrene when using tert-BuOOH (TBHP) as oxidant. Styrene shows a high conversion (∼99%) as well as epoxide selectivity (∼80%) over Cu-MSN catalysts, and high conversion (∼99%) and moderate epoxide selectivity (∼65%) over Mn-MSN and Co-MSN catalysts. The recycling experiment results indicate that these catalysts maintain catalytic activity even after being used for three cycles. Our results indicate that MSNs can serve as better catalyst supports.
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China.
authors.forename: Duihai
authors.initials: D
authors.lastname: Tang
authors.forename: Wenting
authors.initials: W
authors.lastname: Zhang
authors.forename: Yinling
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhen-An
authors.initials: ZA
authors.lastname: Qiao
authors.forename: Yunling
authors.initials: Y
authors.lastname: Liu
authors.forename: Qisheng
authors.initials: Q
authors.lastname: Huo
mesh_terms: D000327:Adsorption; D002384:Catalysis; D020134:Catalytic Domain; D056831:Coordination Complexes / Q000737:chemistry / Q000378:metabolism*; D004852:Epoxy Compounds / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry / Q000378:metabolism; D020058:Styrene / Q000737:chemistry*; D013818:Thermogravimetry; D028561:Transition Elements / Q000737:chemistry / Q000378:metabolism*
chemical_list: D056831:Coordination Complexes; D004852:Epoxy Compounds; D028561:Transition Elements; D020058:Styrene; D012822:Silicon Dioxide