摘要
采用等体积浸渍法制备了ZrO_(2)掺杂的Ag/α-Al_(2)O_(3)催化剂,采用XRD、N_(2)吸附-脱附、UV-Vis漫反射、H_(2)-TPR、NH_(3)-TPD和O_(2)-TPD等方法对催化剂进行了表征,研究了ZrO_(2)掺杂量对催化剂催化乳酸乙酯选择性氧化制丙酮酸乙酯反应性能的影响。实验结果表明,ZrO_(2)的掺杂能够显著降低反应所需最佳温度,改善催化剂的活性和稳定性,同时有效降低催化剂的积碳概率;ZrO_(2)的最佳掺杂量为2%(w),在340℃、氧酯摩尔比1.4、液态空速0.6 h^(-1)的反应条件下,乳酸乙酯转化率可达97.8%、丙酮酸乙酯选择性可达90.7%,经100 h反应后,催化剂活性保持稳定。
The ZrO_(2)-modified Ag/α-Al_(2)O_(3) catalyst was prepared by the equal volume immersion method,and characterized by XRD,N_(2) adsorption-desorption,UV-Vis,H_(2)-TPR,NH_(3)-TPD and O_(2)-TPD.The effect of ZrO_(2) loading on the selective oxidation of ethyl lactate to ethyl pyruvate was investigated.Experimental results show that ZrO_(2) loading can significantly reduce the optimal temperature required for the reaction,improve the activity and stability of the catalyst,and effectively reduce the carbon accumulation probability of the catalyst.The optimal loading of ZrO_(2) is 2%(w),and under the reaction conditions of 340℃,molar ratio of oxygen to ethyl lactate 1.4 and LHSV 0.6 h^(-1),ethyl lactate conversion can reach 97.8%,ethyl pyruvate selectivity can reach 90.7%.After 100 h of the reaction,the catalyst activity remains stable.
作者
杨靖丰
黄龙
陈建华
易玉峰
王新承
Yang Jingfeng;Huang Long;Chen Jianhua;Yi Yufeng;Wang Xincheng(College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,Beijing 102617,China;Beijing Fleming Technology Co.,Ltd.,Beijing 102699,China)
出处
《石油化工》
CAS
CSCD
北大核心
2022年第10期1145-1151,共7页
Petrochemical Technology
