摘要
采用水热合成与离子交换方法,将中心原子不同的过渡金属(Co^(2+))取代型Keggin结构杂多阴离子XW_(11)O_(39)Co(H_2O)^(n-)(X=Ge^(4+),B^(3+)和Co^(2+))嵌入Zn-Al型阴离子粘土层间,合成了底面间距(d001)为1.46±0.01nm的新型层柱化合物Zn_2Al—GeW_(11)Co,Zn_2Al-BW_(11)CO和Zn_2Al-CoW_(11)Co;通过XRD,IR,XPS和DTA等手段,研究了它们的结构与性质,推测了这些杂多阴离子(XW_(11)Co)在层间的空间取向;考察了这些新型层柱化合物对乙酸与n-丁醇酯化反应的催化活性;吡啶吸附IR光谱研究结果表明,它们同时具有B酸与L酸两种酸中心.
The heteropolyoxometalate,XW11O39Co(H2O)n-(X=Ge4+ ,B3+ and Co2+ ) having Keggin structure is intercalated into the interlayer space of Zn-Al type layered double hydroxide via both hydrothermal reaction and ion exchange reaction, and a new type of pillared layered microporous compounds,Zn2Al - GeW11Co, Zn2Al - BW11Co and Zn2Al - CoW11Co with higherbasal space (d001-1.46 ± 0.01nm) have been obained. The structure and properties of the new compounds were studied by XRD, IR spectra,XPS and DTA. The orientation of the intercalated anions XW11Co was deduced. Catalytic activity of those new compounds for esterification of acetic acid with n - butanol was also studied. It was found that the catalytic activity is higher than HY. Their IR spectra of pyridine adsorption indicated the new compounds possess both B - acid centre and L - acid centre.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1997年第1期49-55,共7页
Acta Chimica Sinica
基金
国家自然科学基金
吉林大学无机水热合成开放实验室基金资助课题
