无定形Al-P-O催化剂上气相合成邻羟基苯乙醚  

Vapor-phase synthesis of guaethol on amorphous Al-P-O catalyst

作　　者：程功林 任新峰 徐冬菲 汪学广 鲁雄刚 尚兴付 CHENG Gonglin;REN Xinfeng;XU Dongfei;WANG Xueguang;LU Xionggang;SHANG Xingfu(State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy,School of Materials Science&Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,省部共建高品质特殊钢冶金与制备国家重点实验室,上海市钢铁冶金新技术开发应用重点实验室,上海200444

出　　处：《化工进展》2022年第4期1900-1907,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(U1860203,51574164)。

摘　　要：通过一步沉淀-蒸发法制备了具有不同P/Al摩尔比(x=1.00、1.05、1.10、1.15、1.20)的无定形介孔Al-xPO催化剂。通过X射线衍射(XRD)、N_(2)吸附-脱附、电感耦合等离子体原子发射光谱(ICP-AES)、NH_(3)程序升温脱附(NH_(3)-TPD)和CO_(2)程序升温(CO_(2)-TPD)等手段对制备的Al-xP-O催化剂进行表征,考察了P/Al摩尔比对催化剂表面酸碱性及催化性能的影响。当P/Al摩尔比在1.00~1.10范围时,随P/Al摩尔比增加,催化剂弱酸性位点数量增加,中等强度碱性位点数量降低,邻苯二酚转化率提高,邻羟基苯乙醚选择性提高。当反应温度为270℃、空速为3.0mL/(gcat·h)、P/Al摩尔比为1.10时,催化性能最佳。200h稳定性测试中,邻羟基苯乙醚选择性始终保持在93.0%左右,反应后催化剂无明显积炭,表明该催化剂对邻苯二酚与乙醇气相合成邻羟基苯乙醚反应具有较高的稳定性和工业应用价值。Amorphous mesoporous Al-xP-O catalysts with different P/Al molar ratios(x=1.00,1.05,1.10,1.15,1.20)were prepared by a one-pot precipitation-evaporation route.The Al-xP-O catalysts were characterized by X-ray diffraction(XRD),N_(2) adsorption-desorption method,ICP-AES,NH_(3) temperature-programmed desorption(NH_(3)-TPD)and CO_(2)-TPD experiment.The relationship between P/Al molar ratio and surface acidic-basic properties of Al-xP-O catalysts were also studied.The results demonstrated that with the increase of the P/Al molar ratio in the range of 1.00~1.10,the amounts of weak acidic sites increased,the amounts of medium-strength basic sites decreased,the conversion to catechol increased,and the selectivity to guaethol increased significantly.As the reaction conditions were:temperature of 270℃,LHSV of 3.0mL/(gcat·h)and P/Al molar ratio of 1.10,the catalyst exhibited the relative higher catalytic activity.In the reaction period of the 200h stability test,the selectivity to guaethol remained stable at 93.0%,and there was no obvious coke-deposition after reaction.The result indicated the catalyst has good industrial application prospects due to the properties of high stability for the vaporphase selective synthesis of guaethol with catechol and ethanol.

关 键 词：Al-P-O催化剂 固定床 脱附 失活 

分 类 号：TQ426.94[化学工程]