摘要
基于氧化锰(MnOx)催化剂优异的氧化还原性能,采用水热法制备了一系列具有层状结构的MnOδ催化剂,并对其物化性能进行了表征.研究了水热反应温度、煅烧温度以及原料组成对催化剂晶体结构、形貌和氧化还原性能的影响,并将MnOδ催化剂应用于柴油机尾气炭烟颗粒的催化燃烧.结果表明,当水热反应时间为12 h,煅烧温度为550℃,反应原料中KOH和K2CO3同时存在时,所制备的MnOδ-t12催化剂具有最佳的催化燃烧炭烟颗粒的活性,T10,T50和T90值分别为274,321和354℃.
Abstract
Based on the excellent redox performance of manganese oxide(MnOx)catalysts,a series of layered MnOδ catalysts were prepared by hydrothermal method in this paper.The physicochemical properties of as-prepared catalysts were characterized by XRD,Raman,SEM,TEM,N2 adsorption-desorption,H2-TPR,O2-TPD and so on.The effects of hydrothermal reaction temperature,calcination temperature,and raw material composition on the crystal structure,morphology,and redox performance of the catalyst were studied.In addition,the as-prepared catalysts were applied in catalytic combustion of diesel exhaust soot particles.The results showed that the MnOδ-t12 catalyst exhibits the best catalytic activity when the hydrothermal reaction time was 12 h,the calcination temperature was 550℃,and the presence of KOH and K2CO3 in the raw materials.The corresponding temperature values of T10,T50 and T90 for soot combustion are 274,321 and 354℃,respectively.
基金项目
国家自然科学基金(22072095)
国家自然科学基金(22372107)
国家自然科学基金(U1908204)
国家重点研发计划项目(2022YFB3506200)
国家重点研发计划项目(2022YFB3504100)
辽宁省优秀青年基金(2022-YQ-020)
辽宁省兴辽英才青年拔尖人才计划项目(XLYC2203007)
沈阳市科技计划项目(22-322-3-28)
万方数据