摘要
新型层柱微孔材料─ＧａＷ_９Ｚ_３（Ｚ＝Ｃｏ^（２＋），Ｆｅ^（３＋））柱撑ＺｎＡｌ阴离子粘土的合成、表征及催化性能的研究张继余，余新武，张淑云，胡长文，梁兆君，王恩波（东北师范大学化学系，长春１３００２４）关键词阴离子粘土，杂多化合物，过渡金属，催化性...
The tungstogallic heteropolyanions trisubstituted with transition metal cobalt and ferrum GaW_9Z_3 (Z=Co￣(2+),Fe￣(3+)) have been incorporated into the interlayer of ZnAl-NO_3 type anion clay by means of hydrothermal ion-exchange for the first time in this paper. The layered microporous materials were characterized by XRD,IR,elementary analysis and DTA. Powder X-ray diffraction shows that the aion clay precursor possesses a regular layered structure and a good crystallinity,a nd the pillared derivatives are provided with gallery heights of 0.99±0.01 nm,IR spectra exhibit that the vibration frequencies of heteropolyanions existing in the layered regions of anion clay were similar to those of the authentic heteropoly salts,so we can draw the conclusion that Keggin structure of the gallery heteropolyanions is maintained. Besides,the characteristic peak of at 1384 cm￣(-1)disappeared,it indicated the intercalation reactions carried out completely.This conclusion is identical with that of XRD and elementary analysis. DTA illustrated that the stability order is:ZnAl-GaW_9Fe_3>ZnAl-GaW_9Co_3>GaW_9Fe_3>GaW_9Co_3>Znal-NO_3.Catalytical tests exhibit that the intercalated derivatives have higher catalytic activity and very high selectivity for esterification reaction of phthalic anhydride with 2-ethyl hexanol.
出处
《分子催化》
CSCD
1995年第4期241-243,共3页
Journal of Molecular Catalysis(China)
基金
吉林大学无机水热合成开放实验室资助
关键词
阴离子粘土
催化性能
层柱微孔材料
微孔材料
Anion caly
heteropoly compounds
Transition metal
Catalytic activity.
