V_2O_5-SiO_2表面复合物金属催化剂载体的制备与表征

PREPARATION AND CHARACTERIZATION OF V 2O 5SiO 2 SURFACE COMPOUND

采用ＶＯＣｌ２的盐酸溶液等体积浸渍ＳｉＯ２载体的表面反应方法制备了键联型Ｖ２Ｏ５ＳｉＯ２（ＶＳＯ）表面复合物。利用红外光谱法（ＩＲ）研究了其表面结构状态以及对Ｃ２Ｈ６的化学吸附性能；并利用程序升温还原技术（ＴＰＲ）考察了该表面复合物载体对负载金属Ｐｄ、Ｃｕ氧化物还原过程的影响。结果表明，ＶＳＯ具有类同于载体ＳｉＯ２的孔结构和机械强度；ＶＳＯ对Ｃ２Ｈ６有一定的化学吸附能力，Ｃ２Ｈ６分子Ｃ－Ｈ键中的Ｈ吸附在ＶＳＯ表面Ｖ＝Ｏ键的氧上，形成分子化学吸附态；ＰｄＯ、ＣｕＯ和ＰｄＯＣｕＯ与ＶＳＯ之间可形成的Ｐｄ－Ｏ－Ｖ５＋或Ｃｕ－Ｏ－Ｖ５＋，此键中的氧促进了活性组分的还原，使ＰｄＯ、ＣｕＯ的还原温度降低。

Bondconjugated type V 2O 5SiO 2 (VSO) surface compound was prepared by impregnating silica with a hydrochloric acid solution of VOCl 2 followed by surface reaction, hydrolysis with aqueous ammonia and calcination at 450℃ The states of the surfacestructure and C 2H 6 chemisorption properties of sample have been characterized using BET and IR techniques The effect of the VSO support on Pd and Cu oxides reduction process has been investigated by temperatureprogrammed reduction techniques (TPR)