摘要
采用低温固相法制备Ni-Al_2O_3催化剂,考察反应温度和空速对Ni-Al_2O_3催化剂浆态床CO甲烷化性能的影响,并对反应后的催化剂进行XRD,BET,TPH,TG-DTG和TEM等进行表征。评价结果表明,反应温度增加,CO转化率先增大后趋于不变,较适宜的反应温度为290—305℃。反应空速增大,催化剂活性先增大后减小,空速为1 200 mL/(g·h)时,活性最好,其CO转化率、CH4选择性和收率分别为98.3%、95.8%和94.2%。寿命实验表明,该催化剂在经过10 h的诱导期后,活性趋于稳定,超过25 h后,活性开始下降。表征发现,温度升高和空速增大,均导致Al O(OH)增多,不利于反应进行;积炭反应伴随着消炭反应,温度越高,越有利于消炭反应发生。因此,反应温度和空速的选择需要综合考虑各方面的影响因素。
The low temperature solid-state reaction method was used to prepare Ni-based catalysts. Influence of reaction temperature and space velocity on the catalyst performance for CO methanation in slurry bed was investigated in this paper. And the spent catalysts were characterized by XRD, BET, TPH and TG-DTG methods. Results showed that the conversion of CO increased firstly and then decreased with the increase of reaction temperature, and the appropriate reaction temperature of the prepared catalyst was 290-305 ℃. With the increase of reaction space velocity, the activity of the catalyst also increased firstly and then decreased, and the activity of the catalyst was the best as the space velocity up to 1 200 mL/（g·h）, with CO conversion, CH 4 selectivity and CH 4 yield of 98.3%, 95.8% and 94.2% respectively. Life-time experiment indicated that the activity of the catalyst was stable after 10 h induction period. When the reaction time exceeded to 25 h, the activity of the catalyst decreased. Catalyst characterizations showed that with the increase of reaction temperature and space velocity, the content of AlO（OH） increased, which was unfavorable to the methanation reaction. And the coke deposition was accompanied by carbon elimination, and the temperature was more favorable to carbon elimination. Therefore, the choice of reaction temperature and space velocity needs to consider all aspects of the impact factors.
作者
莫文龙
肖艳
马凤云
钟梅
刘景梅
艾沙.努拉洪
MO Wen-long;XIAO Yan;MA Feng-yun;ZHONG Mei;LIU Jing-mei;AISHA ·nulahong(Key Laboratory of Coal Clean Conversion ＆ Chemical Engineering Process（Xinjiang Uyghur Autonomous Region）,College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830046,Xinjiang,Chin)
出处
《化学工程》
CAS
CSCD
北大核心
2018年第7期67-72,共6页
Chemical Engineering(China)
基金
国家高技术研究发展计划(863计划)项目(2015AA050502)
新疆大学自然科学基金资助项目(BS160221)
关键词
甲烷化
Ni-Al2O3
催化剂
机械化学法
浆态床
工艺条件
methanation
Ni-Al2O3
low temperature solid-state reaction
slurry-bed reactor
reaction condition
