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13. Structural Evolution of Active Entities on Co3O4/CeO2Catalyst during Water Gas Shift Reaction

Author

Cao, Yanning, Peng, Xuanbei, Tan, Zhenni, Liu, Yi, Wang, Xiuyun, Zhao, Weitao, and Jiang, Lilong

Abstract

In this work, Co3O4/CeO2was synthesized not only as a catalyst precursor but also as a model catalyst to investigate the active entities over the water gas shift reaction (WGSR). A correlation is established between catalytic activity and cobalt entities that are present upon the surface. The existence of surface Co2+and oxygen vacancies is essential for efficient WGSR. It is observed that, at 200–300 °C, there is the transformation of Co3O4/CeO2to CoO/CeO2–x, with the formation of extra surface oxygen vacancies. At 300–400 °C, a CoO1–x/CemCo1–mOnphase highly active for the WGS reaction is formed. According to DFT atomistic thermodynamics calculation, the reconstruction of active cobalt species at equal oxygen chemical potential facilitates the adsorption of CO and H2O at specific sites, resulting in the superior catalytic performance.

Published
2019
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14. Facile fabrication of Ce-decorated composition-tunable Ce@ZnCo 2 O 4 core-shell microspheres for enhanced catalytic propane combustion.

Author

Zhang Y, Tan Z, Wang X, Zhan Y, Xiao Y, Au C, and Jiang L

Abstract

The design of heterogeneous catalysts of high efficiency for complete oxidation of volatile organic compounds (VOCs) is a challenge. In the present study, propane is adopted as a VOC representative, and core-shell structured ZnCo2O4@CeO2 catalysts with Ce decoration were synthesized and tested for propane combustion. Through SEM, STEM, and EDX analyses, the structure of the ZnCo2O4@CeO2 catalysts was characterized. The results of activity evaluation demonstrate that the presence of Ce can significantly promote catalytic performance, and the most suitable Ce content has been verified. Furthermore, the optimized ZnCo2O4@CeO2 catalyst exhibits excellent thermal stability and strong resistance toward water. The superior catalytic performance over the optimized ZnCo2O4@CeO2 catalyst is attributed to the high concentration of surface lattice oxygen (O2-) and the presence of strong interactions between Ce and Co.

Published
2019
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15. [Association of T393C single nucleotide polymorphism of GNAS1 gene with non-valvular atrial fibrillation].

Author

Li H, Hu Z, Tan Z, Hou Q, and Peng J

Subjects
Adult, Aged, Aged, 80 and over, Alleles, Asian People genetics, Atrial Fibrillation metabolism, Atrial Fibrillation physiopathology, Chromogranins, Female, Gene Frequency, Genotype, Heart Rate, Humans, Male, Middle Aged, Polymerase Chain Reaction, Polymorphism, Restriction Fragment Length, Risk Factors, Atrial Fibrillation genetics, GTP-Binding Protein alpha Subunits, Gs genetics, Polymorphism, Single Nucleotide
Abstract

Objective: To analyze the association between T393C single nucleotide polymorphism (SNP) of GNAS1 gene and non-valvular atrial fibrillation (AF) in Chinese Han patients., Methods: Ninety patients with non-valvular AF and 90 healthy subjects were examined for T393C SNP of GNAS1 gene using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The allele genotypes and the distribution of allele frequencies were analyzed and compared between the two groups. The relationship between allele frequency distribution characteristics and the heart rate variability (HRV) were also studied for analysis of the association between T393C SNP of GNAS1 gene and the autonomic nervous activation in non-valvular AF., Results: The two groups showed a significant difference in the frequencies of genotypes of T393C SNP of GNAS1 gene and allele frequencies (P<0.01). CC genotype and T393C allele frequency were significantly increased in the case group. pNN50, LF, or LF/HF showed no significant difference between different genotypes (P<0.05)., Conclutions: The T393C SNP of GNAS1 gene is closely associated with non-valvular AF in Chinese Han patients.

Published
2013

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