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本研究报道了在焦油脱除及合成气转化(重整)中选择性镍基催化剂的性能。为得到最佳的催化反应条件使用了苯作为焦油模型。实验参数分别为温度700oC～900oC,气体停留时间0.1s～1.1s,催化剂负载为γ-Al2O3支持物质量的3%～21%。以苯为焦油模型的实验中,最佳反应条件为:反应温度800oC,催化剂负载量15wt%,停留时间0.3s。在最佳催化条件下,催化剂Ni/γ-Al2O3在下吸式气化炉中可以脱除合成气中99%以上的焦油,在上吸式气化炉中可以脱除合成气中98%的焦油。浓聚的可燃性合成气复合物也显著增加:合成气中H2浓度在下吸式气化炉中从19.96%增加到51.78%,在上吸式气化炉中从23.97%增加到37.39%;合成气中CO浓度在下吸式气化炉中从16.26%增加到21.10%,在上吸式气化炉中从22.95%增加到5.64%。结果表明,在合适的催化条件下,催化剂Ni/γ-Al2O3不仅能有效脱除合成气中的焦油,而且可以提高生物质气化中合成气的品质。
This study reports the performance of selective Ni-based catalysts for tar removal and syngas conversion (reforming). Benzene was used as a tar model to get the best catalytic reaction conditions. Experimental parameters were temperature 700oC ~ 900oC, gas residence time 0.1s ~ 1.1s, and catalyst loading was 3% ~ 21% of the mass of γ-Al2O3 support. In experiments with benzene as tar model, the optimum reaction conditions were: reaction temperature 800oC, catalyst loading 15wt%, residence time 0.3s. Under optimal catalytic conditions, the catalyst Ni / γ-Al2O3 can remove more than 99% of the syngas from the syngas in the desorption gasifier, 98% of the syngas in the syngas . Concentration of flammable syngas complex was also significantly increased: the concentration of H2 in the syngas increased from 19.96% to 51.78% in the aspirator gasifier and from 23.97% to 37.39% in the aspirator gasifier; The CO concentration in the gas increased from 16.26% to 21.10% in the aspirator gasifier and increased from 22.95% to 5.64% in the aspirator gasifier. The results show that the catalyst Ni / γ-Al2O3 can not only effectively remove the tar in the syngas but also improve the quality of the syngas in the gasification of biomass under the proper catalytic conditions.