Zhaopeng Liu,Yan Xu,Zhenhua Li,Baowei Wang,Weihan Wang,Xinbin Ma,Renjie Liu
In this paper, Ce 0.2 Zr 0.8 O 2 composite supports were prepared by different Ce-addition methods including impregnation of cerium (CeZr-imp), impregnation of citric acid and cerium (CeZr-CA) simultaneously and deposition precipitation method (CeZr-DP), respectively. The as-prepared supports were applied to prepare 10 wt% MoO 3 /Ce 0.2 Zr 0.8 O 2 catalysts for sulfur-resistant methanation . The N 2 adsorption/desorption, X-ray diffraction (XRD), Raman spectroscopy (RS), X-ray photoelectron (XPS), temperature-programmed reduction by hydrogen (H 2 -TPR) were undertaken to get textural properties, morphological information and structures of the catalysts. The results showed that MoO 3 was highly dispersed on the surface of these three supports and Ce was mostly of coexisted in Ce 4+ /Ce 3+ redox pairs. Compared with Mo/CeZr-imp, the CO conversion increased by 10% and 15% for Mo/CeZr-CA and Mo/CeZr-DP, respectively. This was mainly attributed to the larger specific surface area, Ce 3+ concentration and content of active MoS 2 on the surface of catalysts.
Ce-doped yttria-stabilized ZrO 2 (YSZ) fibers were prepared with different Ce concentrations (0, 5, 10, 20 mol%) by the sol-gel method. The effects of Ce addition on the microstructure and mechanical properties of the YSZ fibers have been investigated. Compared with the pure YSZ fibers, the Ce addition could cause grain refinement whose mechanism was discussed. Moreover, mechanical measurements showed that the Ce addition could increase the Young's modulus and microhardness of the YSZ fibers. When the doping content was 10%, the values of Young's modulus and microhardness were improved by almost 3 times and 2 times compared with those of the pure YSZ fibers, respectively. Results show that the Ce addition could improve the thermal insulation , thermal conductivity at 800 °C being reduced by over one third (33.52%) when the amount of Ce increased to 20%.
危险品化学品经营许可证（带存储）