添加Ce(La)的Pd/γ-Al_2O_3甲醇低温裂解催化剂的结构和性能  

The structure and properties of CeO_2 and La_2O_3 modified Pd/γ-Al_2O_3 for methanol decomposition at low temperatures

作　　者：杨成[1] 任杰[1] 孙予罕[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001

出　　处：《天然气化工—C1化学与化工》2000年第5期33-35,43,共4页Natural Gas Chemical Industry

基　　金：山西省自然科学基金!(981 0 1 8)资助项目 ;山西省青年科学基金! (991 0 1 0 )资助项目

摘　　要：采用XRD、BET、NH3 TPD、TPR等方法对CeO2 以及La2 O3和CeO2 共同改性的γ -Al2 O3担载Pd催化剂的结构和性能进行研究。结果表明 ,CeO2 改性的Pd/γ -Al2 O3具有很高的甲醇低温分解活性 ,但表面酸性导致生成较多的二甲醚 ;La2 O3的加入掩蔽了催化剂的表面酸性 ,同时促进了CeO2 在γ -Al2 O3载体内外表面的分散 ,使活性组分Pd和CeO2 之间的相互作用加强 ,从而大大提高了甲醇的裂解率。The structure and properties of Pd/γ Al 2O 3 modified by CeO 2 and La 2O 3 CeO 2 were studied by means of XRD, N 2 adsorption, NH 3 TPD and TPR The catalysts of CeO 2 modified Pd/γ Al 2O 3 showed high activity for methanol decomposition at low temperatures with a considerable amount of DME as by product due to the surface acidity The addition of La 2O 3 covered the acidic sites and promoted the dispersion of CeO 2, and then reinforced the interaction between CeO 2 and Pd, thus methanol decomposition remarkably increased without the by product of DME [WT5”HZ]

关 键 词：甲醇裂解 担载Pd催化剂 LA2O3 CEO2 

分 类 号：O642[理学—物理化学]