反相微乳液法制备铈锰取代六铝酸盐甲烷燃烧催化剂  

Preparation of Ce and Mn substituted hexaaluminate catalysts for natural gas combustion by reverse microemulsion

作　　者：宋永吉[1] 朱安民[1] 任晓光[1] 

机构地区：[1]北京石油化工学院,北京102617

出　　处：《功能材料》2008年第1期75-78,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20476012);北京市自然科学基金资助项目(8032007);北京市属;市管高校人才强教计划资助项目(BJJWR20051102)

摘　　要：研究了组成及温度对水/环己烷/TX-100+正戊醇体系反相微乳液区的影响,选择合适组成的反相微乳液做为合成介质,制备了BaMnCeAl10O19-δ六铝酸盐催化剂,研究了制备条件对催化剂样品的比表面积、结构及甲烷燃烧催化活性的影响。结果表明,该体系反相微乳液区面积的变化受到组成和温度的影响,当n=3∶2、温度为25℃时,体系的反相微乳液区最大。油相和硝酸盐加入量的不同对催化剂的活性、粒径以及比表面积有较大的影响,油相用量增加、硝酸盐混合溶液用量的减少有利于所制备活性的提高以及比表面积的增加。在油相用量较大(硝酸盐混合溶液用量较小)的条件下,制备出的催化剂活性最高,其T10%、T50%和T90%分别达到456、582和698℃。A reverse microemulsion system composed of water （or nitrate solution）, cyclohexane, TritonX-100＋n-pentanol was prepared. Effects of ingredients concentration in the mixture and temperature on the behavior of the reverse microemulsion system were investigated. Experiment results indicated that there were larger reverse microemulsion regions at 25℃ and n=3：2. Based on above results,suitable operation temperature and reverse microemulsion system were selected to synthesize cerium-substitute hexaaluminates. Activities of methane combustion over the catalysts were tested in micro reactor. The catalysts were characterized by method of XRD and BET. The results showed that ingredients concentration of the reverse microemulsion had little effect on the crystalline of the samples. However,specific surface area of the samples and activity for methane combustion over cerium-magnesium substituted hexaaluminate catalyst exhibited obvious difference. Catalyst prepared with lower water concentration behaved higher specific surface area and higher catalytic activity for methane combustion. The temperatures at 10% ,50% and 90% oxidation conversion of methane were 456,582 and 798℃ ,respectively.

关 键 词：反相微乳液 催化燃烧 催化剂 六铝酸盐 甲烷 

分 类 号：O643[理学—物理化学]