Waugh结构的H_(12)[MnMo_9O_(32)(KO)_6]的合成、晶体结构及催化性能

Synthesis,Crystal Structure and Catalytic Activity of a Waugh Type Polyoxometalate H_(12)[MnMo_9O_(32)(KO)_6]

合成了具有Waugh结构的多金属氧酸盐H12[MnMo9O32（KO）6]，用X射线单晶衍射、IR、XRD、热重分析对标题化合物进行了表征。结果表明，晶体属于trigonal晶系，R3空间群，晶胞参数：a=15．5380（6）nm，b=15．5380（6）nm，c=12．3777（5）nm，α=90°，β=90°，γ=120°，V=2587．98（18）nm^3，Z=3，R1=0．0134，ωR：=0．0308。催化活性测试结果表明，该化合物对环己醇制环己烯有良好的催化活性。当催化剂用量为环己醇质量分数的6．6％，反应温度170～180℃，反应时间为30min的条件下，环己醇的转化率可达69．6％，环己烯选择性达96．0％。

A Waugh type polyoxometalate H12 [ MnMo9O32 （KO） 6 ] was synthesized and structurally characterized by means of single crystal X-ray diffraction, IR, XRD and TG. The compound crystallized in the trigonal systemwith space group R3, a=15.5380（6） rim, b=15.538 0（6） nm, c=12.377 7（5） nm, α=90°,β=90°,γ=120°, V=2587.98（18） nm^3, Z=3, R1 =0.013 4, ωR2 =0.030 8. The catalytic activity of the title compound for the dehydration of cyclohexanol was studied. The conversion of C6 Hn OH reached to 69.6 % and the selectivity of C6 H10 was 96% when the amount of catalyst, temperature range and reaction time were 6. 6%, 170 - 180℃, 30 min, respectively.