新型多孔碳化硅催化剂载体的制备与应用

Preparation and application of a novel porous silicon carbide catalyst support

采用气固相合成的方法制备出比表面积可达260m2.g-1的多孔SiC颗粒。对制备温度、时间进行了考察。将多孔SiC负载Co催化剂用于费托合成反应发现,由于SiC的化学惰性较强,金属与载体间的相互作用较弱,有利于钴氧化物的还原,提高了催化剂活性。同时SiC热导性好,有利于反应热量的及时移出,可防止催化剂烧结。CO单程转化率超过60%,表现出良好的催化活性。制备出的多孔碳化硅通过XRD、SEM、低温氮气吸附、TPR等手段进行了表征。

A porous silicon carbide catalyst support with large surface area ( up to 260 m^2g^(-1)) was prepared by gas-solid phase synthesis. The parameters such as synthesis temperature and synthesis time were investigated. The porous silicon carbide was used as the support of Co/SiC catalyst for Fischer-Tropsch synthesis,resulting in enhancement of the activity (with CO conversion over 60%) due to chemical inertness (weak interaction with the active metal and hence better reduction of cobalt oxides) and good heat conductivity (preventing sintering of the catalyst) of the porous SiC. The porous SiC was characterized by XRD, SEM, nitrogen isotherm adsorption and TPR.