Weiping Ding

Oxidative coupling of methane over Ce4+-doped Ba3 WO6 catalysts: investigation on oxygen species responsible for catalytic performance

Ce4+ doped Ba3 WO6 complex oxides were used as catalysts for methane oxidative coupling (MOC), and characterized by XPS and O2-TPD-MS techniques. The results indicate that the ratio of electrophilic oxygen species O− and O2− to lattice oxygen on the surface is crucial for C2 selectivity. By adjusting the relative amount of cations in Ba-W-Ce complex oxides with perovskite superstructure interstitial oxygen species can be created which benefits C2 selectivity by raising the relative amount of (O− + O2−) on the surface.

Preparation and catalytic property of a non-crystalline alloy of iron–boron with one-dimensional nanostructures

This paper describes our recent progress on the synthesis and catalytic hydrogenation property of iron?boron non-crystalline alloy with one-dimensional nanostructures, including nanowires, nanorods and nanotubes. The synthesis of one-dimensional nanostructures of iron?boron non-crystalline alloy involves the use of lyotropic liquid crystals of non-ionic?anionic mixed surfactants as templates. The non-ionic surfactants used are Tween 40 (polyoxyethylene sorbitan monopalmitate) and Tween 60 (polyoxyethylene sorbitan monostearate), and the anionic surfactant is CSA (camphorsulfonic acid). The non-crystalline iron?boron nanotubes thus prepared are more effective than the corresponding nanowires and nanorods for the catalytic hydrogenation of m-nitrotoluene. The lyotropic liquid crystals of mixed surfactants provide an effective template for the fabrication of inorganic materials with one-dimensional nanostructures.

Biomimetic synthesis of aluminophosphate nanorolls induced by mixed organoamines

Natural kingite-like aluminophosphate nanorolls were obtained by biomimetic synthesis using a mixed-organoamine template.

Synthesis of a novel mesoporous iron phosphate

A novel mesoporous iron phosphate, possessing a specific nsurface area of 254 m2 g−1 and average pore ndiameter of 2.6 nm, is synthesized using a fluoride route.

In situ synthesis of horizontally aligned metal–boron alloy nanotubes on a silicon substrate with liquid crystal template

In this paper, an interesting strategy has been described for the direct synthesis of parallel aligned metal-boron alloy nanotubes on silicon substrates, involving the use of lyotropic liquid crystal of non-ionic-anionic mixed surfactants. In particular, super-long, up to the scale of millimetres, nanotubes with well-controlled inner and outer diameters can be obtained. The current lyotropic liquid crystal template method could be used as an effective strategy for the in situ synthesis of aligned one-dimensional nanostructures with the wet chemical method. The results further prove the rolling-up mechanism for the formation of noncrystal metal-boron alloy nanotubes with a layered lyotropic liquid crystal precursor.

Charge transfer satellites in X-ray photoelectron spectra of lanthanum in SrZrO3 lattice

Abstract An investigation of the 3d photoelectron spectra of lanthanum in SrZrO 3 crystal lattice is reported. The satellite peaks appearing in the spectra are found to be different for lanthanum in different sites of the SrZrO 3 lattice, and are discussed in terms of coexcitations of charge transfer type, namely O 2p → La 4f transitions.

Central Doping of a Foreign Atom into the Silver Cluster for Catalytic Conversion of CO2 toward C−C Bond Formation

Clusters with an exact number of atoms are of particular interest in catalysis. Their catalytic behaviors can be potentially altered with the addition or removal of a single atom. Now the effects of doping with a single foreign atom (Au, Pd, and Pt) into the core of an Ag cluster with 25 atoms on the catalytic properties are explored, where the foreign atom is protected by 24u2005Ag atoms (Au@Ag24 , Pd@Ag24 , and Pt@Ag24 ). The central doping of a single atom into the Ag25 cluster has a substantial influence on the catalytic performance in the carboxylation reaction of CO2 with terminal alkyne through C-C bond formation to produce propiolic acid. These studies reveal that the catalytic properties of the cluster catalysts can be dramatically changed with the subtle alteration by a single atom away from the active sites.

Suppressing the active site-blocking impact of ligands of Ni6(SR)12 clusters with the assistance of NH3 on catalytic hydrogenation of nitriles

Atomically precise metal clusters stabilized by organic ligands have attracted extensive interest, and these monodisperse clusters have particular potential for providing insights into puzzling areas of heterogeneous catalysis such as inherent size polydispersity. In many traditional catalytic reactions, however, the reactivity of metal clusters is frequently found to be passivated, where the active sites on the surface metal atoms are blocked by the ligand molecules. Therefore, of particular interest are studies that involve triggering the catalytic ability of metal clusters, with no need to remove any ligands, via thermal treatments that usually destroy their atomically precise structures. Herein, with the determination of the structure of Ni6(SR)12 (where SR denotes thiolate), where Ni atoms are fully coordinated with the thiolate molecules, the catalytic activity of Ni6(SR)12 for nitriles hydrogenation toward primary amines could be significantly enhanced with the assistance of NH3 molecules that positively suppress the ligand-shielding effect.