Han-Qing Chen,Zhan-Kuo Guo,Shu-Xiang Xiang,Hui-Lin Jiang,Yun-Lei Teng
Directly converting metal oxide-adsorbed CO2 to CH4 at low temperatures is a more energy-saving method for achieving carbon capture and utilization. In this study, an Al2O3-supported Ni/CaO composite was greenly prepared by a mechanochemical method. It is found that CO2 capture and selective methanation can be realized over the Ni/CaO/Al2O3 composite at as low as 200 °C under static pressure conditions. The methane yields over the 10Ni/10CaO/γ-Al2O3 composite reach 70.05 and 388.5 μmol CH4 per g at 200 and 350 °C with approximately 100% selectivity to CH4. The experimental results show that the reaction time and temperature obviously affect the methanation yield over the Ni/CaO/Al2O3 composite. This work provides a facile energy-saving strategy for converting CO2 to CH4 at low temperatures.
Liu Zhihong,Ye Fengchun,Chen Rui,Wang Hongjun,Xia Longgong
Halogen-containing organic components in waste electrical and electronic equipment have an obvious influence on the distribution behaviors of valuable metals during the smelting processes. However, the mechanism is still incomplete in the literature. The equilibration-quenching-(ICP+EPMA) experimental technique has been applied in studying the partitioning behaviors of Au, Ag, and Sn in the Cu-FeO x -SiO 2 -CaO-Al 2 O 3 smelting system in the presence of halogen elements (F, Cl, Br). The obtained results showed that: (1) 93% Au terminated into the alloy phase in CaF 2 adding experiments, and a maximum of 32% Au reported to the gas phase in CaCl 2 or CaBr 2 adding experiments; (2) 22–49% Ag entered the gas phase when adding CaF 2 into the system, and 3–34% Ag entered into the gas phase when adding CaCl 2 or CaBr 2 ; and (3) halogen elements influenced Sn dramatically, and portions of Sn in the gas phase and slag phase increased along with increasing temperature or halides dosage.
危险品化学品经营许可证（带存储）