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中文摘要：
通过溶胶-凝胶法制备了SiO2负载Dawson型磷钨酸H6P2W18O62/SiO2催化剂.表征结果表明：负载后磷钨酸仍保持Dawson结构,负载量为30%;磷钨酸比较均匀地分散在SiO2载体上.以催化1,4-丁二醇脱水制备四氢呋喃作为探针反应,考察催化剂的酸催化性能.正交试验和单因次试验结果表明：催化剂对1,4-丁二醇环化脱水合成四氢呋喃反应具有良好的催化性能;最佳反应条件为催化剂用量占1,4-丁二醇质量的6.6%,反应温度为185～190℃,反应时间为40 min,四氢呋喃平均收率为91.70%;催化剂重复使用5次后,催化活性基本保持不变,四氢呋喃收率仍可达90.90%.
英文摘要：
Phosphotungstic acids with Dawson structure（ H6P2W18O62） supported on SiO2 were prepared by sol-gel method. The Dawson structure of phosphotungstic acids after loading on SiO2 and 30%H6P2W18O62 loading quantity are confirmed, and H6P2W18O62/ can be well dispersed on the SiO2 support. The catalytic performance of H6P2W18O62 was investigated by the catalytic synthesis of tetrahydrofu- ran from 1,4-butanediol. The results of orthogonal experiments and simple factor experiments show that H6P2W18O62//SiO2 exhibits good catalytic performance for catalytic synthesis of tetrahydro-furan fiom 1 ,4- butanediol. Under the optimal conditions with H6P2W18O62/ of 6.6% relative to the dosage of 1,4-butane- diol, reaction temperature of 185 - 190 ~C and reaction time of 40 rain, the isolated yield of tetrahydrofu- ran can reach 91.70%. The catalyst can be reused for five times with no evident decline of catalytic per- formance, and the isolated yield of tetrahydro-furan is still above 90.90%.
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Clean Oxidation of Cyclohexanone to Adipic Acid Catalyzed by Ammonium Phosphomolybdate with Dawson s
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