摘要
用离子交换法制备了新型层柱催化剂ＺｎＡｌ－ＸＷ１１Ｚ（Ｘ＝Ｐ，Ｇｅ，Ｂ和Ｃｏ；Ｚ＝Ｖ，Ｔｉ，Ｃｒ和Ｃｏ等）；ＸＲＤ和ＩＲ测试结果表明，该化合物具有通道高度为０．９９±０．０１ｎｍ的层柱结构，层间阴离子保持Ｋｅｇｇｉｎ结构骨架；对乙酸与正丁醇的酯化反应，它比ＨＹ分子筛具有更高的催化活性；吸附吡啶的ＩＲ测定结果表明，它同时具有Ｂ酸和Ｌ酸两种酸性中心．
Heteropolyanions XW 11 O 39 Z(H 2O) n - (X=P, Ge, B and Co; Z=V, Ti, Cr and Co) with mono substituted Keggin structure were intercalated into the layers of anion clay of Zn Al type using ion exchange method, and a new type layer pillared microporous material with basal spacing of 1 46±0 01 nm, ZnAl XW 11 Z, was obtained. The catalysts were found to be catalytically efficient for esterification of acetic acid with n butanol in liquid solid phase. Among the gallery anions, the activity is in the following order: PW 11 Co>GeW 11 Co>BW 11 Co>CoW 11 Co. This order suggests that the order of the surface acid strength of ZnAl XW 11 Co increases with the decrease of the negative charge of heteropolyanion in their gallery. It was concluded that the surface acid strength of ZnAl XW 11 Z is correlated with mono heteropolyanion and their interaction with the host layer. The IR spectra of pyridine adsorbed (at 473 K) show that ZnAl XW 11 Z possesses both B and L acidic centres.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1996年第3期237-240,共4页
基金
国家教委优秀年轻教师基金 吉林大学无机水热合成开放实验室基金
关键词
催化剂
杂多阴离子
丁醇
乙酸
酯化
催化活性
Layer pillared catalyst, n Butanol, Acetic acid, Esterification, Heteropolyanion
