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镍镁铝水滑石制备及乙二醇水相重整制氢性能
作者:潘国祥1 曹枫1 倪哲明2 李小年2 陈海锋1 唐培松1 徐敏虹1 
单位:1. 湖州师范学院化学系 浙江 湖州 313000 2. 浙江工业大学化学工程与材料学院 杭州 310032 
关键词:水滑石  水相重整 制氢 
分类号:O611.6
出版年,卷(期):页码:2011,39(4):33-37
DOI:
摘要:

采用共沉淀法成功合成了不同n(Ni2+)/n(Mg2+)/n(Al3+)(摩尔比)的镍镁铝水滑石,用粉末X射线衍射和氢气程序升温还原、乙二醇水相重整制氢探针反应对镍镁铝水滑石的物相、组成、还原过程和催化性能进行表征。结果表明:所形成的纯相水滑石的[n(Ni2+)+n(Mg2+)]/n(Al3+)为1.25~6.50。NiMgAl水滑石衍生催化剂(反应后)的物相由Ni、MgAl水滑石和AlO(OH)相组成。催化剂前躯体还原过程包括层板镍还原和复合氧化物中镍还原两步。随着反应温度和给料速率增加、反应压力降低,乙二醇水相重整制氢产率依次增加。随着Mg含量增加,其氢气选择性呈增加趋势;增加Ni含量,氢气选择性依次降低、烷烃选择性逐渐升高;综合氢气选择性和产率,NiMgAl水滑石性能最佳。

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The NiMgAl layered double hydroxides (LDHs) with different n(Ni2+)/n(Mg2+)/n(Al3+) (mole ratios) were synthesized by a coprecipitation method. The phase composition and catalytic performance of Ni-Mg-Al LDHs were characterized by powder X-ray diffraction, H2-TPR (temperature programmed reduction) and probe reaction of aqueous-phase reforming of ethylene glycol. The results show that the synthesized materials with unitary hydrotalcite phase can be obtained when (n(Ni2+)+n(Mg2+))/n(Al3+) is 1.25-6.50. NiMgAl-LDHs derived catalyst (after reaction) was composed of Ni, MgAl-LDHs and AlO(OH) phases. The reduction process for active content Ni of NiMgAl-LDHs involved two stages. The H2 production rate from aqueous-phase reforming of ethylene glycol (EG) increased with increasing in the reaction temperature and the feeding rate of EG, and decreased with increasing in the reaction pressure. The selectivity of H2 production could be improved when Mg modified to Ni/Al hydrotalcite, which was related to the basic of supporters. The H2 selectivity decreased and the alkanes selectivity increased with increasing the Ni contents. Considering the selectivity and the activity of Ni based catalysts, we found that the catalytic performance of NiMgAl-LDHs derived catalyst could be superior.

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基金项目:
湖州市科技计划(2009KTZ10)和浙江省教育科学规划研究课题《地方院校材料化学专业应用型模块化教学探索与研究》(SCG182)资助项目。
作者简介:
博士,讲师
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参考文献:

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