生物质甘油经气化制甲烷 Ni-Ce/Al2O3 催化剂研究.

Ce-modified Ni/Al2O3 catalysts for methanation of glycerol reforming gases were prepared by impregnation, and characterized by BET, XRD, H2-TPR and CO2-TPD respectively. And the effects of Ce amount, methanation temperature and time-on-stream on the catalytic properties of Ce-modified Ni /AI2O3 in the glycerol reforming gases to methane were also investigated. The results indicated that the introduced Ce species preferentially occupied on the surface of micro-pores of Ni/Al2Os catalysts, inhibited the strong interaction between active Ni species and support AI2O3 to spinel NiAl2O4, and promoted the formation of highly-dispersed active Ni species. Therefore, the Ce-modified Ni/Al2O3 catalysts exhibited a higher catalytic property in methanation. For example, Ni/Al2 CO3 modified by 3 wt % of Ce exhibited an excellent catalytic stability at 275 — 300 °C , received ratios of conversion towards CO and CO2 with above 99% and 75% respectively. It was estimated that 1 kg biomass glycerol could produce 570 L of methane through the steam reforming and methanation according to the results in present work. [ABSTRACT FROM AUTHOR]