MoVBiTeO/SiO_2对丙烷选择氧化制丙烯醛反应的催化性能  

Catalytic Performance of MoVBiTeO/SiO_2 for Selective Oxidation of Propane to Acrolein

作　　者：何益明[1,2] 伊晓东[1] 黄传敬[1] 翁维正[1] 万惠霖[1] 

机构地区：[1]厦门大学化学系固体表面物理化学国家重点实验室,物理化学研究所,福建厦门361005 [2]中国科学院福建物质结构研究所结构化学国家重点实验室,福建福州350002

出　　处：《催化学报》2008年第4期409-414,共6页

基　　金：国家重点基础研究发展计划(2005CB221408);国家自然科学基金(20433030,20021002,20423002);福建省科技重大专项(2005HZ01-3)

摘　　要：用浸渍法制备了一系列不同Mo/V比的MoVBiTeO/SiO2催化剂,并用X射线衍射、拉曼光谱、X射线光电子能谱、程序升温还原和红外光谱等方法对催化剂的结构、氧化还原性质和酸性进行了表征,考察了催化剂对丙烷选择氧化制丙烯醛反应的催化性能.结果表明,Mo与V组分之间存在较强的相互作用,调变了催化剂的结构,并形成了氧化还原循环(V5++Mo5+V4++Mo6+),促进了催化剂中电子和O物种的传递,使催化剂的低温可还原性增强,催化活性提高.Mo组分有利于形成L酸位,而V组分有利于形成B酸位.这可能是丙烯醛选择性随Mo/V比增大而逐渐提高的原因之一.当Mo/V摩尔比为6时,催化剂具有最高的丙烯醛收率(9.7%).A series of MoVBiTeO/SiO2 catalyst samples with different Mo/V ratios were prepared by the impregnation method. The catalyst structure, reducibility, and acidity were characterized by XRD, Raman, XPS, TPR, and FT-IR techniques, and the catalytic performance of the catalyst for selective oxidation of propane to acrolein was evaluated. The results indicated that the interaction between Mo and V components modified the catalyst structure, and the redox cycle of V^5＋＋Mo^5＋←→V^4＋＋Mo^6＋ was formed. The improvement in the reducibility of the catalyst might be responsible for the increase in propane conversion. The V and Mo components were responsible for B acid and L acid, respectively. When the Mo/V ratio increased, the amount of B acid decreased, and the catalyst selectivity for acrolein increased. Among the investigated catalyst samples, the sample with a Mo/V molar ratio of 6 exhibited the best catalytic performance.

关 键 词：钼 钒 铋 碲 复合氧化物 氧化硅 负载型催化剂 丙烷 选择氧化 丙烯醛 

分 类 号：O643.32[理学—物理化学]