欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
制备了一系列镁基复合氧化物MgM-n样品（M=Sn,Al,Ti,La,Ce,Zr;n为Mg/M原子比）,用X射线衍射、N2吸附-脱附、CO2程序升温脱附、紫外可见漫反射光谱和电子自旋共振等手段表征了它们的结构和表面性质,并考察了其以过氧化氢为氧化剂催化烯烃环氧化反应性能.结果表明,MgM-n样品表面碱量和催化性能与其中M的种类及含量密切相关.MgSn-4样品的表面碱量比MgAl-4低,虽两者在催化苯乙烯环氧化反应中,苯乙烯转化率和环氧化物选择性均为95%左右,过氧化氢利用率大于80%,但在循环使用过程中MgSn-4的催化性能更为稳定,并在不同结构烯烃的环氧化反应中表现出优良的催化性能.这除与MgSn-4表面碱强度适当有关外,还与其中存在高分散的Sn4＋物种及其结构特性有关.
英文摘要：
A series of Mg-based mixed oxides MgM-n （M = Sn,Al,Ti,La,Ce,Zr; n = Mg/M atomic ratio） were prepared. The physicochemical properties of these mixed oxides were characterized by X-ray diffraction,N2-adsorption/desorption,CO2 temperature-programmed desorption,ultraviolet and visible diffuse reflectance spectroscopy,and electron spin resonance. The catalytic activity of MgM-n for the epoxidation of olefins was investigated with H2O2 as an oxidant. The results indicated that the catalytic performance and basicity of MgM-n mixed oxides were correlated to the type and doping amount of M species. The MgAl-4 and MgSn-4 samples showed a conversion and epoxide selectivity as high as 95% along with over 80% H2O2 efficiency for the epoxidation of styrene. However,MgSn-4 possessed lower surface basicity and more stable performance during consecutive reuse in comparison with MgAl-4. Moreover,MgSn-4 could catalyze the epoxidation of olefins of different structure with excellent performance. With the characteristic studies,it was presumed that such a superior performance of MgSn-4 could essentially be ascribed to the highly dispersed Sn4＋ species and its unique structure as well as the proper ba-sicity.
同期刊论文项目
同项目期刊论文
Supported monodisperse Pt nanoparticles from Pt-3(CO)(3)(mu(2)-CO)(3) (5)(2-) clusters for investiga
Cu24O24Si8R8: Organic Soluble 56-Membered Copper(I) Siloxane Cage and Its Use in Homogeneous Catalys
Probing Stepwise Reaction of NNP-Ligand Copper(I) Complex with Elemental Sulfur by Using N-Heterocyc
Structure and catalytic performance of alumina-supported copper-cobalt catalysts for carbon monoxide
Highly efficient mesostructured Ag/SBA-15 catalysts for the chemoselective synthesis of methyl glyco
Bronsted acidic ionic liquid as an efficient and recyclable promoter for hydroesterification of olef
Copper-catalyzed propylene epoxidation by oxygen Significant promoting effect of vanadium on unsuppo
Iron-Catalyzed Highly Enantioselective Reduction of Aromatic Ketones with Chiral P2N4-Type Macrocycl
Spectroscopic and DFT Study on the Interaction System of Vanadium with L-Proline in Aqueous Solution
Trends in R-X Bond Dissociation Energies (R-center dot = Me, Et, i-Pr, t-Bu, X-center dot = H, Me, C
Theoretical studies of Na+ location in ZSM-5: Model selection for accurate coordination structure an
Acid-catalysed direct transformation of cellulose into methyl glucosides in methanol at moderate tem
Exploring the Sodium Cation Location and Aluminum Distribution in ZSM-5: A Systematic Study by the E
Conversion of cellobiose into sorbitol in neutral water medium over carbon nanotube-supported ruthen
Production of ethanol by gas phase hydrogenation of acetic acid over carbon nanotube-supported Pt-Sn
PVP-stabilized heteropolyacids as reusable self-assembling catalysts for alcoholysis of cellulosic s
DCMB that Combines Divide-and-Conquer and Mixed-Basis Set Methods for Accurate Geometry Optimization
Cu/SiO2 hybrid catalysts containing HZSM-5 with enhanced activity and stability for selective hydrog
An efficient Ni-Mo-K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher
Improved performance of magnetically recoverable Ce-promoted Ni/Al2O3 catalysts for aqueous-phase hy
Electronic Properties and Desolvation Penalties of Metal Ions Plus Protein Electrostatics Dictate th
Influence of the support and promotion on the structure and catalytic performance of copper-cobalt c
Vapor-phase hydrogenation of dimethyl oxalate over a CNTs-Cu-SiO2 hybrid catalyst with enhanced acti
Synthesis of novel chiral tetraaza ligands and their application in enantioselective transfer hydrog
A boracite metal-organic framework displaying selective gas sorption and guest-dependent spin-crosso
Na+-intercalated carbon nanotubes-supported platinum nanoparticles as new highly effective catalysts
Nonfitting protein-ligand interaction scoring function based on first-principles theoretical chemist
Ruthenium Nanoparticles Supported on Carbon Nanotubes for Selective Hydrogenolysis of Glycerol to Gl
Morphology effects of nanocrystalline CeO2 on the preferential CO oxidation in H-2-rich gas over Au/
Preferential CO oxidation in a H(2)-rich gas by Au/CeO(2) catalysts Nanoscale CeO(2) shape effect an
Promoting Effect of Lewis Acid on the Olefin Hydroesterification Catalyzed by Triphenylphosphine-Pal
Copper-containing hexagonal mesoporous silicas for styrene epoxidation using tert-butylhydroperoxide
Performance of Gold Nanoparticles Supported on Carbon Nanotubes for Selective Oxidation of Cycloocte
Effects of acidity and immiscibility of lactam-based Bronsted-acidic ionic liquids on their catalyti
Carbon Nanotube-Supported RuFe Bimetallic Nanoparticles as Efficient and Robust Catalysts for Aqueou
Enhanced performance of lipase-catalyzed kinetic resolution of secondary alcohols in monoether-funct
Effect of boric oxide doping on the stability and activity of a Cu-SiO(2) catalyst for vapor-phase h
期刊信息
位置：