采用共沉淀.水热法合成了一系列Ni/MgAl(O)催化剂.用甲苯和萘的混合物作为焦油模型化合物,在固定床反应器上研究了该催化剂直接催化转化具有较低水蒸气/碳摩尔比的高温焦炉煤气中焦油为小分子气体的反应.考察了催化剂组成、水蒸气/碳摩尔比和反应条件等对催化剂性能的影响.结果表明,Mg/Al摩尔比为3时Ni/MgAl(O)催化剂表现出最优的催化性能.在700～800℃和水蒸气/碳摩尔比为0.68的反应条件下,15%Ni/Mg_3Al(O)催化剂能将甲苯和萘完全转化为CO和CH_4等小分子气体.在反应气中引入0.05%H_2S(摩尔分数)气体的实验表明,该催化剂在焦油催化转化反应中具有较好的抗硫能力.另外,在催化剂中加入少量Pt助剂能显著提高催化剂活性.
A series of Ni/MgAl(O) catalyst samples were prepared by the co-precipitation-hydrothermal method and were used for the cata-lytic conversion of model tar compounds toluene and naphthalene from hot coke oven gas with lower steam/carbon molar ratios in a fixed-bed reactor at atmospheric pressure. The effects of Mg/Al molar ratio in the catalyst, steam/carbon ratio and other reaction conditions on the catalytic performance were examined. The results indicated that the Ni/MgAl(O) catalyst with Mg/Al molar ratio of 3 showed the optimal catalytic performance for the catalytic conversion of model tar compounds. Toluene and naphthalene were completely converted into light fuel gases CO and CH_4 over 15%Ni/Mg_3Al(O) at 700-800℃ and steam/carbon = 0.68. The experimental results of introducing 0.05% H_2S (molar fraction) in the feed gas showed that the Ni/MgAl(O) catalyst had good sulfur tolerance. The addition of a small amount of Pt in the catalyst could obviously improve the catalytic performance of the Ni/MgAl(O) catalyst.
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