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内容：本人在12月15日到22日在纽约举行的展览会期间了解到贵公司产品号为5670的新产品，非常感兴趣，请贵方发给我们一份价格单和说明书。感谢贵方的合作，希望我们可以建立贸易关系。
【高频词句】
1．price list and instruction价格单和说明书
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Phosphotungstic acid (PHA) supported on magnetic nanoparticles Fe3O4 coated by SiO2 (Fe3O4@SiO2/PHA) was prepared and employed for the synthesis of 5-(hydroxymethyl)furfural (HMF) from glucose. The as-prepared catalyst was characterized by infrared spectroscopy (IR) and powder X-ray diffraction (XRD). It was found that the supported catalyst Fe3O4@SiO2/PHA exhibited similar catalytic activity to that of PHA. The effects of such reaction variables as the amount of PHA, reaction solvent, temperature and time were studied in detail. The yield of HMF at 30.4% was observed at 130 oC for 3 h in N, N-dimethylformamide. The supported catalyst was recovered after the reaction and reused without further treatment. No significant change in activity was observed at the initial 4 cycles, in which the yield of HMF changed in a small range from 28.7 to 30.4%.
