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过渡元素三取代型与镧系双(1:11)系列Keggin结构杂多阴离子是性能优秀的氧化型催化剂.但在均相氧化反应体系中存在着稳定性差和难以回收并反复使用等缺点.具有化学组成通式为[M_(1-x)~(2+)M_x~(3+)(OH)_2]·A_(x/n)~(n-)·yH_2O的类水滑石层间的阴离子(A~(n-),通常为体积较小的简单无机离子,这些离子具有可交换性.Pinnavaia等人首先将V_(10)O_(28)~(6-)通过离子交换方法嵌入Zn_2Al双氢氧化物层间,得到通道高度约为0.72nm的新型层柱化合物Zn_2Al-V_(10)O_(28).并发现它在均相体系中,对异丙醇光氧化成两酮的反应,比均相中的V_(10)O_(28)~(6-)具有更优秀的催化活性与选择性.最近,我们将XW_(11)O_(39)Z(H_2O)~(n-)型杂多阴离子嵌入Zn_2Al型类水
Transition element tri-substituted and lanthanide double (1:11) series Keggin structure heteropolyanions are excellent oxidation catalysts, but there are some shortcomings in the homogeneous oxidation reaction system, such as poor stability and difficult to recycle and reuse. The anion of the hydrotalcite-like interlayer with the chemical composition of [M_ (1-x) ~ (2+) M_x ~ (3 +) (OH) _2] · A_ (x / n) ~ (n-) · yH_2O (A ~ (n)), usually simple inorganic ions with small size, which are exchangeable.Pinnavaia et al first embedded V_ (10) O_ (28) ~ (6-) (10) O 28 with a channel height of about 0.72 nm was obtained, and it was found that in the homogeneous system, the reaction of photooxidation of isopropanol to two ketones, (10) O 28- (6-) in the homogeneous phase has more excellent catalytic activity and selectivity recently we will XW 11 O 39 Z (H 2 O) n- type Heteropolyanions Encapsulate Zn2Al Type Water