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以MCM-41、HZSM-5以及丝光沸石(MOR)为载体,磷钨酸(PW)为活性组分,通过浸渍法制备一系列负载型磷钨酸催化剂;采用FTIR、XRD、N2-吸附-脱附和NH3程序升温脱附等分析手段对催化剂进行表征.结果表明在负载活性物质过程中,载体骨架未被破坏,PW以无定形结构均匀分散到载体的表面并与载体间存在着明显的键合作用.通过果糖分解制备5-羟甲基糠醛(5-HMF)的反应对催化剂的催化性能进行了评估,结果表明相对于其它催化剂,HZSM-5负载磷钨酸催化剂(PW/HZSM-5)凭借其具有更高的表面酸量以及合适孔径而表现出更好的催化活性和更高选择性的生成5-HMF;以二甲基亚砜为溶剂,PW/HZSM-5为催化剂,在120℃条件下反应80min,果糖的转化率高达到96.5%,生成5-HMF的选择性为79.9%.
A series of supported phosphotungstic acid catalysts were prepared by impregnation method using MCM-41, HZSM-5 and mordenite as carriers and PW as active component. FTIR, XRD, N2-adsorption- Desorption and NH3 temperature desorption analysis were used to characterize the catalyst.The results showed that during the process of loading the active material, the framework of the carrier was not destroyed, and the PW was uniformly dispersed on the surface of the carrier by the amorphous structure and had obvious bonds with the carrier The catalytic performance of the catalyst was evaluated by the reaction of fructose decomposition to produce 5-HMF (5-HMF). The results showed that the catalyst of HZSM-5 supported phosphotungstic acid (PW / HZSM-5 ) Produced 5-HMF by virtue of its higher surface acidity and suitable pore size, showing better catalytic activity and higher selectivity; PW / HZSM-5 as a catalyst in dimethyl sulfoxide solvent and The reaction was carried out at 120 ℃ for 80 min. The conversion of fructose was up to 96.5% and the selectivity to 5-HMF was 79.9%.