乙烷在钛酸盐复合氧化物上的氧化脱氢Ⅱ.碱金属掺杂及CO_2在反应中的作用

OXIDATIVE DEHYDROGENATION OF ETHANE OVER PEROVSKITE CATALYSTS Ⅱ. Roles of the Alkali Metal Ion Doping and CO 2

乙烷在钛酸盐复合氧化物上的氧化脱氢Ⅱ．碱金属掺杂及ＣＯ２在反应中的作用陈铜李文钊＊于春英（中国科学院大连化学物理研究所，大连１１６０２３）关键词乙烷，氧化脱氢，碱金属，掺杂钙钛矿低碳烷烃由于其饱和性直接用途很少，一般是先转化成活性较高的不饱和碳氢化合...

The oxidative dehydrogenation of ethane (ODHE) over CaTi 0.9 M 0.1 O 3- δ (M=Li, Na, K) catalysts has been examined in the range 600￣700℃. It is observed that the C 2H 4 selectivity is improved by substitution of alkali metal for Ti in CaTiO 3. By means of electrical conductivity and H 2 TPR measurement, it appears that the oxygen vacancy and the non fully reduced oxygen species are created by alkali metal doping, and the latter seems to be the active sites for C 2H 4 selectivity. CO 2 TGA indicates that the intrinsic catalytic behavior of alkali metal doped perovskite catalysts can be shown off only after the decomposition of carbonate formed by the action of CO 2 with alkali metal and alkaline earth component of the catalyst during the reaction.