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13 results on '"Guo, Zhongxiang"'

10. Influence of sintering atmosphere on the formation of ZrSiO4 by solid‐state sintering method.

Author

Dan, Hui, Li, Jiajing, Zhao, Dandan, Lei, Hongyue, Guo, Zhongxiang, Xiang, Yucheng, Chen, Yisheng, and Ding, Yi

Subjects
GLASS-ceramics, ATMOSPHERE, ZIRCONIUM oxide, CERAMICS, MICROSTRUCTURE, NITROGEN, SINTERING
Abstract

Exploring the influence of sintering atmosphere on the formation of ZrSiO4 is of great significance. Herein, ZrSiO4 ceramics were prepared by the solid‐state reactive sintering method under different atmospheres (air, N2, vacuum, and Ar + 5%H2). The influence of sintering atmosphere on the phase and microstructure evolutions of the obtained ceramics was investigated. It was found that ZrSiO4 ceramics could be prepared under air atmosphere, whereas ZrO2–SiO2 glass ceramics were obtained under N2, vacuum, and Ar + 5%H2 atmosphere, which may be due to the fact that the oxygen‐deficient environment inhibits the transformation of ZrO2 to tetragonal phase (t‐ZrO2) and the crystallization of amorphous SiO2. The results demonstrated that t‐ZrO2 and c‐SiO2 were beneficial for the formation of ZrSiO4. The ZrSiO4 conversion fraction was up to 96.16% under air atmosphere at 1450°C for 6 h. Furthermore, the predominant formation mechanism of ZrSiO4 was the reaction between t‐ZrO2 and c‐SiO2. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Efficient adsorption of CO2by amino-functionalized short pore SBA-15: Influence of pore length on adsorption capacity and amino efficiency

Author

Dan, Hui, Lei, Hongyue, Luo, Junyi, Guo, Zhongxiang, Xiang, Yucheng, Chen, Yisheng, and Ding, Yi

Abstract

Amino-functionalized SBA-15 (AS) with different pore lengths (short pore: 300 nm, SAS and long pore: several tens μm, LAS) were synthesized and applied for CO2adsorption. The adsorption capacity and amino efficiency affected by pore length, temperature and amino-functionalization were systematically investigated. It was found that CO2adsorption behavior strongly depended on the pore length, amino-functionalization and adsorption temperature. With decreasing pore length, the adsorption capacity and amino efficiency increased. The amino efficiency increased and the adsorption capacity decreased with increasing temperature. The obtained SAS with short pore exhibited the highest adsorption capacity (1.58, 1.26 and 0.96 mmol CO2/g) and amino efficiency (0.07, 0.19 and 0.27 mol CO2/mol N) under 273, 298 and 323 K at 1 bar, respectively, owing to the high utilization of internal pores. Furthermore, the obtained adsorbents showed good temperature adaptability and reusability. The results demonstrated the potential of the obtained adsorbents for CO2adsorption.

Published
2023
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