共沉淀镍催化剂用于膜反应器中高碳烃类燃料水蒸气重整反应  

Application of Coprecipitated Nickel Catalyst to Steam Reforming of Higher Hydrocarbons in Membrane Reactor

作　　者：陈亚中[1] 徐恒泳[1] 王玉忠[1] 熊国兴[2] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2006年第9期772-776,共5页

基　　金：国家重点基础研究发展计划(973计划)(2005CB221401)资助项目.

摘　　要：采用共沉淀法制备了NiO/La-Al2O3催化剂,利用低温N2物理吸附、程序升温还原、H2-O2化学吸附和X射线衍射对催化剂进行了表征,并将该催化剂应用于Pd膜反应器中高碳烃类燃料水蒸气重整反应.结果表明,催化剂中NiO与载体间存在较强的相互作用.与常规固定床反应器相比,在膜反应器中,由于高渗透性能的Pd金属复合膜能选择分离氢气,结果氢气产率得到了明显的提高,甲烷的生成得到了有效抑制,并且在接近实用的反应条件下,依然能够得到高的氢气产率和回收率.高碳烃类燃料水蒸气重整反应制氢的过程可以在一个膜反应器中,利用一种催化剂在反应温度低于823K的温和条件下实现.The Ni/La-Al2O3 catalyst prepared by a coprecipitation method was employed to hydrogen production from steam reforming of higher hydrocarbons in a palladium membrane reactor. The catalyst was characterized by low temperature N2 adsorption, H2 temperature-programmed reduction, H2-O2 chemisorption, and X-ray diffraction. The results showed that there was a strong interaction between NiO and the support. In the Pd membrane reactor, due to the selective removal of H2 by the membrane, the yield of H2 was increased significantly, while the formation of methane was suppressed in contrast with the results in the conventional fixed-bed reactor. Even under the near-practical application conditions, e. g. , high GHSV and small flux of sweep gas, high yield of H2 and membrane separation efficiency were still obtained. Furthermore, no degradation of the membrane was observed even under working conditions of 823 K and steam-to-carbon feed ratio 2.7. This suggested that it was feasible to realize H2 production from steam reforming of higher hydrocarbons using only one reactor and one nickel-based reforming catalyst at reaction temperatures lower than 823 K.

关 键 词：共沉淀 镍催化剂 纳米化 高碳烃类燃料 水蒸气重整 钯膜反应器 

分 类 号：TQ032[化学工程]