Abstract
Nickel supported on SBA-15 doped with CeO2 catalysts (Ni-CeO2/SBA-15) was prepared, and used for steam reforming of toluene which was selected as a model compound of biomass gasification tar. A fixed-bed lab-scale set was designed and employed to evaluate the catalytic performances of the Ni-CeO2/SBA-15 catalysts. Experiments were performed to reveal the effects of several factors on the toluene conversion and product gas composition, including the reaction temperature, steam/carbon (S/C) ratio, and CeO2 loading content. Moreover, the catalysts were subjected to analysis of their carbon contents after the steam reforming experiments, as well as to test the catalytic stability over a long experimental period. The results indicated that the Ni-CeO2/SBA-15 catalysts exhibited promising capabilities on the toluene conversion, anti-coke deposition and catalytic stability. The toluene conversion reached as high as 98.9% at steam reforming temperature of 850 °C and S/C ratio of 3 using the Ni-CeO2(3wt%)/SBA-15 catalyst. Negligible coke formation was detected on the used catalyst. The gaseous products mainly consisted of H2 and CO, together with a little CO2 and CH4.
Highlights
The utilization of lignocellulosic biomass has gained attention in recent years [1,2,3]
Zhang et al [20] prepared Ni/olivine catalysts doped with CeO2 for steam reforming of model tar compounds, and found that the catalysts were effective in terms of both catalytic activity and anti-coke deposition performances
Ni-CeO2/SBA-15 catalysts, toluene was selected as the model tar compound for experiments, because it is a major and stable tar compound formed in the high temperature gasification process
Summary
The utilization of lignocellulosic biomass has gained attention in recent years [1,2,3]. Zhao et al [19] prepared Ni/cordierite catalysts for steam reforming of toluene which was selected as a model tar compound. Zhang et al [20] prepared Ni/olivine catalysts doped with CeO2 for steam reforming of model tar compounds (benzene and toluene), and found that the catalysts were effective in terms of both catalytic activity and anti-coke deposition performances. (Ni-CeO2/SBA-15) catalysts were prepared for steam reforming of biomass gasification tars. The large pore size makes the mesoporous SBA-15 very promising to convert large molecule compounds, since the traditional microporous catalysts are unable to treat the large molecules (including tars). Ni-CeO2/SBA-15 catalysts, toluene was selected as the model tar compound for experiments, because it is a major and stable tar compound formed in the high temperature gasification process. Experiments were performed to reveal the effects of the reaction temperature, S/C ratio, and CeO2 loading content on the toluene conversion and product distribution
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