W－Mn／SiO_2催化剂甲烷氧化偶联制乙烯流化床工艺条件考察  

Test of Technological Conditions of W-Mn/SiO_2 Catalyst for Oxidative Coupling of Methane in a Fluidized-bed Reactor

作　　者：林景治[1] 杨得信[1] 顾靖芳 张传卫[1] 杨英兰 褚衍来[1] 李树本[1] 

机构地区：[1]中国科学院兰州化学物理研究所

出　　处：《分子催化》1995年第3期193-200,共8页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金

摘　　要：本文报导了浸渍法制备的Ｗ－Ｍｎ／ＳｉＯ_２催化剂分别在Φ２８和Φ３８毫米反吹式流化床上进行的条件试验和３００ｈ稳定性试验结果。并用ＸＲＤ、ＦＴ－ＩＲ、ＢＥＴ等方法对催化剂进行了表征。结果表明，该催化剂可适用于流化床，并具有较好的ＣＨ４氧化偶联制Ｃ２烃的催化活性和稳定性。催化剂的结构研究表明，经３００ｈ反应后，该催化剂中结晶形式的Ｎａ_２ＷＯ_４和Ｍｎ_２Ｏ_３均已消失；α－方石英结构已完全转变为α－磷石英和α－ＳｉＯ_２石英，但催化剂的这种结构变化尚未对生成Ｃ２烃的收率和选择性产生明显影响。In this paper, the results of tests for technological conditions and 300h stabiliity test of the catalyst used for OCM respectively in Φ 2 8 and Φ 38 mm counter-blow fludized bed reactors respectively were given. The catalysts were characterized by XRD、FT-IR and BET. The results show that the catalyst is suited for fluidized-bed operation and has good catalytic activity and stability for OCM. Structural studies of catalyst indicated that the cystalline Na_3WO_4 and Mn_2O_3 in the catalyst disappeared after 300 h reaction, the structure of α-cristobalite in the fresh catalyst was transformed to the structure of α-tridymite and α-SiO_2. However, the yield and selectivity of C_2 products were not affected by the structural changes.

关 键 词：乙烯 甲烷 氧化偶联 催化剂 流化床 钨-锰体系 

分 类 号：TQ221.211[化学工程—有机化工] TE646[石油与天然气工程—油气加工工程]