Catalytic steam reforming is a promising route for tar conversion to high energy syngas in the process of biomass gasification. However, the catalyst deactivation caused by the deposition of residual carbon is still a major challenge. In this paper, a modified Ni-based Ni-Co/Al₂O₃-CaO (Ni-Co/AC) catalyst and a conventional Ni/Al₂O₃ (Ni/A) catalyst were prepared and tested for tar catalytic removal in which toluene was selected as the model component. Experiments were conducted to reveal the influences of the reaction temperature and the ratio between steam to carbon on the toluene conversion and the hydrogen yield. The physicochemical properties of the modified Ni-based catalyst were determined by a series of characterization methods. The results indicated that the Ni-Co alloy was determined over the Ni-Co/AC catalyst. The doping of CaO and the presence of Ni-Co alloy promoted the performance of toluene catalytic dissociation over Ni-Co/AC catalyst compared with that over Ni/A catalyst. After testing in steam for 40 h, the carbon conversion over Ni-Co/AC maintained above 86% and its resistance to carbon deposition was superior to Ni/A catalyst.

催化蒸汽重整是在生物质气化过程中将焦油转化为高能合成气的有前途的途径。然而，由残留碳的沉积引起的催化剂失活仍然是主要挑战。本文研究了一种改性的Ni基Ni-Co / Al ₂ O ₃ -CaO（Ni-Co / AC）催化剂和常规的Ni / Al ₂ O ₃制备（Ni / A）催化剂并测试焦油催化去除的效果，其中选择了甲苯作为模型组分。进行实验以揭示反应温度以及蒸汽与碳之间的比率对甲苯转化率和氢产率的影响。通过一系列表征方法确定了改性镍基催化剂的理化性质。结果表明，在Ni-Co / AC催化剂上测定了Ni-Co合金。与在Ni / A催化剂上相比，CaO的掺杂和Ni-Co合金的存在促进了Ni-Co / AC催化剂上甲苯催化离解的性能。在蒸汽中测试40小时后，Ni-Co / AC上的碳转化率保持在86％以上，并且其抗碳沉积性能优于Ni / A催化剂。