摘要
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700～800oC和水蒸气/碳摩尔比为0.68的反应条件下,15%Ni/Mg3Al(O)催化剂能将甲苯和萘完全转化为CO和CH4等小分子气体.在反应气中引入0.05%H2S(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/MgAI（O） catalyst samples were prepared by the co-precipitation-hydrothermal method and were used for the catalytic 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/A1 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 CH4 over 15%Ni/Mg3Al（O） at 700-800℃ and steam/carbon = 0.68. The experimental results of introducing 0.05% H2S （molar fraction） in the feed gas showed that the Ni/MgAI（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/MgAI（O） catalyst.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2010年第2期218-224,共7页
基金
国家高技术研究发展计划(863计划
2006AA11A189)
上海市科学技术委员会重点项目(07DZ12036)
上海市浦江人才计划(08PJ1405900)
关键词
镍
镁铝氧化物
焦油
甲苯
萘
焦炉煤气
nickel
magnesium aluminum oxide
tar
toluene
naphthalene
coke oven gas
