介孔Ni基催化剂上乙烷氧化脱氢制乙烯  

Oxidative Dehydrogenation of Ethane to Ethylene over Mesoporous Ni-Based Catalysts

作　　者：李建辉[1] 李仁贵[1] 汪彩彩[1] 黄传敬[1] 翁维正[1] 万惠霖[1] 

机构地区：[1]厦门大学化学化工学院化学系,固体表面物理化学国家重点实验室,福建厦门361005

出　　处：《催化学报》2009年第8期714-716,共3页

基　　金：国家重点基础研究发展计划(973计划,2005CB221401,2005CB221408);福建省自然科学基金(2009J01038);国家基础科学人才培养基金(J0630429)

摘　　要：以十二烷基硫酸钠为模板剂,尿素为沉淀剂制备了介孔氧化镍,并将该方法成功拓展至介孔NiMgO催化剂的合成.考察了这两种催化剂以及采用溶胶-凝胶法制备的纳米氧化镍催化剂对乙烷氧化脱氢反应的催化性能.结果表明,介孔氧化镍较纳米氧化镍在相同乙烷转化率条件下乙烯选择性更高,且前者反应温区大为扩展,因而乙烯收率更高.介孔氧化镍经Mg调变后,其催化性能进一步提高,在450oC,C2H6:O2:N2=1:1:4和GHSV=18000ml/(g·h)条件下,介孔NiMgO催化剂上乙烷转化率和乙烯收率分别为56.6%和30.1%,其乙烯收率远高于纳米氧化镍(15.9%)和介孔氧化镍(22.5%).Mesoporous nickel oxide was prepared using sodium dodecyl sulfate as the template and urea as the hydrolysis agent. The method was extended successfully to the synthesis of a mesoporous multicomponent Ni-based catalyst, NiMgO. The mesostructured catalysts were compared with a nanosized NiO catalyst prepared by a sol-gel process. These catalysts were used for oxidative dehydrogenation of ethane to ethylene. The meso-NiO showed higher ethylene selectivity than the nano-NiO at the same ethane conversion. The temperature range for the reaction on meso-NiO was larger, which gave a higher ethylene yield. The catalytic performance of meso-NiO was improved by Mg modification. On meso-NiMgO, a 56.6% ethane conversion with 30.1% ethylene yield was obtained at 450 ℃, C2H6：O2：N2 = 1：1：4, and GHSV = 18000 ml/（g.h）. This ethylene yield was much higher than the best obtained with nano-NiO （15.9%） or meso-NiO （22.5%）.

关 键 词：镍基催化剂 介孔材料 镁 乙烷 氧化脱氢 乙烯 

分 类 号：TQ221.211[化学工程—有机化工]