中文摘要：

利用液相浸渍法制备出新型硅藻土负载Dawson结构磷钨酸铜催化剂（40%Cu_2H_2P_2W_（18）O_（62）·n H_2O/硅藻土）,并对其进行FTIR、XRD、SEM及EDS表征。以40%Cu_2H_2P_2W_（18）O_（62）·n H_2O/硅藻土为催化剂,催化1,4-丁二醇合成四氢呋喃,考察了各相关因素对四氢呋喃收率的影响。结果表明：磷钨酸铜呈球状,比较均匀地负载在圆筛型的硅藻土载体上,且负载前后均保持Dawson结构。在优化反应条件下即：w（催化剂）=2.3%（相对1,4-丁二醇质量）,温度为185℃,时间为35min,四氢呋喃收率为94.8%。催化剂重复使用6次,四氢呋喃收率仍可保持在86.5%。催化剂具有良好的活性及稳定性,工艺简单,为四氢呋喃的绿色合成提供了新的途径。

英文摘要：

Diatomite supported dawson structure copper phosphotungstate（40%Cu_2H_2P_2W_（18）O_（62）·n H_2O/ diatomite） was prepared by liquid impregnation and was characterized with fourier transforming infrared spectrum（FTIR）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） and energy dispersive X-Ray spectroscopy（EDS）. Then it was used to catalyze the cyclodehydration of 1,4-butanediol to prepare tetrahyfrofuran（THF）. The effects of catalyst dosage,reaction temperature,reaction time and catalyst reusability were investigated. The results showed that Cu_2H_2P_2W_（18）O_（62）·n H_2O were spherical and distributed evenly on the surface of the diatomite supports which were holemesh-shaped. Copper phosphotungstate kept in the dawson structure before or after supported on the diatomite carrier. Under the optimal reaction conditions, i.e. the mass ratio of catalyst to 1,4-butanediol 2.3%,reaction temperature 185℃ and reaction time 35 min,the yield of THF reached 94.8%. Even used for six times, the catalyst made the yield of THF reach 86.5%. Cu_2H_2P_2W_（18）O_（62）·n H_2O/diatomite catalyst showed good activity, stability and simple process to prepare,providing a new route for the synthesis of THF.