摘要
以Al_2O_3为载体,Ce、Co和Fe为助剂,采用机械化学法制备了4种镍基催化剂,对其进行了XRD、H_2-TPR、BET、NH_3-TPD等表征。当载气流量为50 ml·min^(-1),裂解温度为750℃时,在固定床反应器中考察了各催化剂对煤焦油模型化合物甲苯+芘裂解行为的影响。结果表明:4种催化剂均为介孔催化剂,且双金属催化剂的介孔有序度更高;催化剂中活性组分Ni主要以尖晶石NiAl_2O_4的形式存在;添加Fe助剂后,催化剂的酸强度较Ni/Al_2O_3增加,添加Ce和Co时则相反。评价实验表明,助剂对重质组分芘的裂解率影响较小,约为67%,然而Ce和Co对催化剂的抗积炭性能有利,其析碳分别较无助剂时降低28.8%和18.0%。
Four nickel based catalysts were prepared by mechanical chemical method, Al2O3 as carrier, Ce, Co and Fe as additives. The catalysts were characterized using XRD, HE-TPR, BET and NHa-TPD. The catalytic effects on cracking behavior of coal tar model compounds toluene and pyrene were investigated in a fixed-bed reactor under carrier gas flow rate of 50 ml·min^-1 and cracking temperature of 750℃. The experimental results showed that all four catalysts have higher ordered mesoporous structure and active species Ni mainly exists as NiAl2O4 spinel in the catalysts. In addition, acidic strength of catalyst with Fe additive was higher than that of Ni/Al2O3, while the opposite trend was observed in catalysts with Ce and Co additives. The cracking evaluation results showed that these additives have little effect on the cracking rate of heavy component pyrene, about 67% for all catalysts. However, Ce and Co additives were beneficial to carbon deposition resistance of catalysts, which carbon deposition, compared to none additive catalyst, was reduced by 28.8% and 18.0%, respectively.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2017年第10期3805-3815,共11页
CIESC Journal
基金
国家自然科学基金项目(21606187)
国家重点研发计划项目(2016YFF0102602)
新疆维吾尔自治区重点实验室开放课题项目(2016D03009)
自治区青年科技创新人才培养工程(QN2016SB0152)~~
作者简介
张艳敏（1988-），女，硕士研究生。
联系人：钟梅。
