Wang XZ

Institute of Rock and Soil Mechanics

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Tao Dou

China University of Petroleum, Beijing

Xiao YZ

Bangchao Zhong

Chongqing Normal University

Q-S. Meng

Institute of Rock and Soil Mechanics

Hsien‐Yi Chen

Chang Gung Memorial Hospital

Bing Zhong

Liaoning University

Wu Y

Zhenlong Zhao

China Post (China)

Yang Xg

Zhengping Hao

Research Center for Eco-Environmental Sciences

Cooperative Institutions

Chinese Academy of Sciences

Institute of Rock and Soil Mechanics

State Key Laboratory of Geomechanics and Geotechnical Engineering

University of Chinese Academy of Sciences

Linyi University

Institute of Coal Chemistry

Beijing Institute of Petrochemical Technology

Chinese Research Academy of Environmental Sciences

Guangxi University

Fuzhou University

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Characterization of Double-Mesopore and Hexagonal Mesopore Silicas Prepared under Different pH Values

Wang XZ Tao Dou Xiao YZ Li YP Bangchao Zhong

Characterization

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Experimental microscopic study of inner pores of calcareous sand

Materials Research Innovations (2014)

C-Q. Zhu Wang XZ R. Wang Hsien‐Yi Chen Q-S. Meng

Microscopic experiments were performed on the inner pores of calcareous sand particles to ascertain the special mechanical properties of calcareous sand. A femtosecond laser was used to cut the calcareous sand particles to obtain cross-sections of particle. The micrographs of the inner pores of the sand particles were taken with a three-dimensional video microscopic visualiser. The parameters of the pores were analysed through the micrograph processing with MATLAB. The results show that calcareous sand has relatively low surface porosity. The surface porosities of particles with pore diameter >2 mm and those in the range of 1–2 mm are 0·66 and 1·07% respectively. Based upon the number of pores, the distribution characteristics of the pores show that there are fewer macropores but more micropores in the sand. In terms of the area of pores, micropores occupy a smaller proportion than macropores. It was found that 65% of the pores have area <1 μm2, and 55% or more of them are equiaxed pores.

Macropore

Equiaxed crystals

Particle (ecology)

Micrograph

10.1179/1432891714z.000000000408

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Catalytic performance of K-Ce0.5Zr0.5O2 catalysts for soot combustion

Ling Zhu Wang XZ J-J Yu Zhengping Hao

XK-Ce0.5Zr0.5O2 catalysts were prepared by incipient-wetness impregnation method, and the catalytic activities for the soot combustion were studied using TPO. XRD, BET, FT-IR and YCPS were used to investigate the influences of KNO3 concentration on the catalytic activities for soot combustion. It was found that the KNO3 had great effect on the surface area and the chemical environment. Compare with Ce0.5Zr0.5O2, the catalytic activities of xK-Ce0.5Zr0.5O2 for soot combustion were improved significantly; the catalyst with x =0.5 had the best catalytic performance, on which T-i and T-p were 290 degrees C and 360 degrees C, respectively. The results suggested that the formation of K2CO3 and molten KNO3 phase during the reaction course promoted the catalytic activities obviously.

Catalytic combustion

Incipient wetness impregnation

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Synthesis and Characterization of Double-Mesopore Silicas

Wang XZ Tao Dou Xiao YZ Bangchao Zhong

Characterization

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Studies on the adsorption property of NO on the Ni-based mixed oxide catalysts with Perovskite-like (ABO(3) and A(2)BO(4)) structure

Zhenlong Zhao Yang Xg Wang XZ Wu Y

The mixed oxides LaNiO3, La0.1Sr0.9NiO3, La2NiO4 and LaSrNiO4 with perovskite (ABO(3)) and related(A(2)BO(4)) structures were prepared and the adsorption property for NO and the catalytic activity for NO decomposition over these oxidse were also tested. The catalysts were characterized by means of BET surface measurement, chemical analysis, NO-TPD etc.. It was shown that the adsorption amount of NO is correlated with the concentration of oxygen vacancy formed and the adsorption type and strength of NO are related to the valence of metallic ion. Generally there are three kinds of adsorption species, NO-, NO+ and NO on the mixed oxides, among them the negative adsorpion species (NO-) are active for NO decomposition. The weaker the adsorption of oxygen on the catalyst is, the faster the mobility of oxygen is and the easier the redox process takes place in reproducing the active sites in which the oxygen species (O-, O2-) would participate.

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Preparation, charactreization, and catalytic properties of Co-M-Al (M = transition metal) mixed oxides derived from hydrotalcite-like compound

Acta Chimica Sinica (1999)

Liu Y Yang Xg Wang XZ Yue Wu

Hydrotalcite-like compounds (HTLcs) CoMAlCO3, where M stands for Cr, Mn, Ni, Cu, or Fe, were synthesized by coprecipitation. After calcination at 450 degrees C, they became mixed oxides with spinel-like structure. The mixed oxides were characterized by XRD, BET, chemical analysis and the adsorption of NO. The catalytic decomposition of NO and its reduction by CO were studied over these mixed oxides. The study showed that the catalytic activity for removal of NO, was very high. The reaction mechanism is proposed and the effects of d-electrons of the transition metals on catalytic activity are elucidated.

Hydrotalcite

Coprecipitation

Mixed oxide

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Higher Alcohol Synthesis over Douole-bed Catalyst

Na Zhao Wang XZ Sun YH

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Synthesis of Mesoporous MCM-41 Molecular Sieves using EDA and HMDA as Catalysts

Wang XZ Tao Dou Xiao YZ Bing Zhong

MCM-41 type mesoporous silica materials are synthesized for the first time under mild conditions by using ethylenediamine (EDA) or hexamethylenediamine (HMDA), which is usually used as the structure directing agent in the synthesis of conventional microporous zeolites and as the catalyst to substitute for NaOH. The as-synthesized samples are characterized by XRD and N2 adsorption studies. The experimental results show that the ordered level of mesoporous framework of the as-synthesized and calcined products is improved obviously because of this substitution.Four reflections become observable in the powder X-ray diffraction patterns of these materials that can be indexed on the basis of a hexagonal closepacked unit cell with a0=4.ll nm and 3.75 nm respectively. A gradual decrease in the d100-spacing is observed from ca. 3.56 nm to ca. 3.24 nm. At the same time, the pore size of products transforms from mesopore into micropore.

Hexamethylenediamine

Ethylene diamine

MCM-41

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Effect of Crystallization Temperature on MCM-41 Synthesis

Baohua Zhong Xiao YZ Tao Dou Wang XZ

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