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以沉淀法、水热合成法和浸渍法制备了磷酸锆催化剂,通过X射线衍射、热重分析、氮气物理吸附、红外光谱和Hammett指示剂法对催化剂进行了表征,并将该催化剂用于甘油气相脱水反应.研究表明,由沉淀法得到的磷酸锆经过400°C焙烧后能达到最佳催化活性,在温和条件下,甘油可完全转化,丙烯醛选择性为81%,反应24h内催化剂失活不明显.不同方法制备的磷酸锆其结构和表面酸性显著不同,催化剂表面酸性对催化剂活性、丙烯醛选择性和催化剂的寿命均有较大影响.
The zirconium phosphate catalyst was prepared by precipitation method, hydrothermal synthesis method and impregnation method. The catalyst was characterized by X-ray diffraction, thermogravimetric analysis, nitrogen physical adsorption, infrared spectroscopy and Hammett indicator method, and the catalyst was applied to glycerol Gas phase dehydration reaction.The results show that the zirconium phosphate obtained by the precipitation method can reach the best catalytic activity after being calcined at 400 ° C and under mild conditions glycerol can be fully converted with the acrolein selectivity of 81% The activity is not obvious.Different methods of preparation of zirconium phosphate structure and surface acidity significantly different, the catalyst surface acidity of the catalyst activity, acrolein selectivity and catalyst life have a greater impact.