氧化锆负载含氧酸钾盐研制固体超强碱

SOLID SUPERBASE DERIVED FROM POTASSIUM SALTS OF OXYACID ON ZIRCONIA

KNO3 等钾盐在 Zr O2 上分散并经高温分解后所形成的碱的最高碱强度 (H- )可达 2 6.5,属于固体超强碱 ,在 2 73K下的顺丁烯异构化反应中具有高催化活性。当钾离子在 Zr O2 上的表面密度接近 8K+ /nm2 时 。

The basicity of resulting materials of ZrO 2 loaded with KNO 3, K 2CO 3 and KHCO 3 was examined by means of Hammett indicator method and probe reactions All of the potassium salts can be well dispersed on zirconia, and form strongly basic sites after decomposition at high temperatures Moreover, zirconia modified by potassium salt possesses superbasicity with its base strength of H = 26 5, and exhibits high activity in isomerization of cis butene at 273K It is interesting to observe that the K +/ZrO 2 sample shows the maximum activity in isomerization of cis butene when its surface density of K + ion is near the value of monolayer threshold of 8 K +/nm 2