关键词: 磷钨酸铜, 硅藻土, 催化剂载体, 催化, 四氢呋喃

Abstract: Diatomite supported dawson structure copper phosphotungstate (40%Cu₂H₂P₂W₁₈O₆₂·nH₂O/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 Cu₂H₂P₂W₁₈O₆₂·nH₂O 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 35min, the yield of THF reached 94.8%. Even used for six times, the catalyst made the yield of THF reach 86.5%. Cu₂H₂P₂W₁₈O₆₂·nH₂O/diatomite catalyst showed good activity, stability and simple process to prepare, providing a new route for the synthesis of THF.

Key words: copper phosphotungstate, diatomite, catalyst support, catalysis, tetrahydrofuran