高比表面积有序介孔Ni/SiC催化CH4-CO2重整反应

Highly coke-resistant ordered mesoporous Ni/SiC with large surface areas in CO2 reforming of CH4

采用纳米浇铸法制备了高比表面积(345 m^2/g)且孔径均一的有序介孔SiC材料(SiC-OM),以商用SiC(49 m^2/g,SiC-C)材料为参比载体。采用等体积浸渍法分别制备了Ni/SiC-OM和Ni/SiC-C,并考察其在CH4-CO2重整反应中的催化性能。利用ICP、BET、XRD、H2-TPR、XPS、HRTEM、TG和Raman等手段对反应前后的两种催化剂进行表征。结果表明,在700℃、1.013×10^5 Pa和12 L/(h·g)的重整条件下,Ni/SiC-OM的平均积炭速率比Ni/SiC-C降低了一个数量级,这主要归因于强金属-载体相互作用和有序介孔骨架的“限域效应”作用。

An ordered mesoporous SiC(SiC-OM)material with high specific surface area(345 m^2/g)and narrow pore distribution was prepared by a nanocasting method,and a commercial SiC(49 m^2/g,SiC-C)was used as a reference carrier.The Ni/SiC-C and Ni/SiC-OM catalysts were prepared by an incipient wetness impregnation method,and tested in the CO2 reforming of CH4(CRM).The textural properties of fresh and used catalysts were characterized by means of ICP,BET,XRD,H2-TPR,XPS,HRTEM,TG,and Raman.The results suggested the average carbon deposition rate over the Ni/SiC-OM decreased one order of magnitude compared with the Ni/SiC-C during 50 h of CRM reaction,due to the strong interaction between Ni species and SiC-OM support and confinement effect of rigid mesoporous skeleton.