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研究了煤质炭负载杂多酸催化剂对邻苯二酚和乙醇的O 乙基化反应的催化性能 .发现相同负载量的Keggin型磷钨酸催化剂的活性远高于硅钨酸和Dawson型磷钨酸 ;负载杂多酸催化剂上邻乙氧基苯酚的选择性明显高于磷酸催化剂 .采用BET ,XRD及TPD技术对催化剂进行了表征 ,并考察了Keggin型磷钨酸的负载量和反应温度对催化性能的影响 .还发现在10h的反应时间内催化剂的活性随着反应时间的延长而降低
The catalytic activity of heteropolyacid catalyst on the ethoxylation of catechol and ethanol was studied.The activity of Keggin-type phosphotungstic acid catalyst with the same loading was found to be much higher than that of silicotungstic acid and Dawson-type phosphorus Tungstic acid, and the selectivity to ortho-ethoxyphenol over supported heteropolyacid catalysts was significantly higher than that of phosphoric acid catalysts.The catalysts were characterized by BET, XRD and TPD techniques, and the loading of Keggin-type phosphotungstic acid and the reaction temperature On the catalytic performance.It was also found that in the reaction time of 10h the catalyst activity decreases with the extension of the reaction time