K负载Sn_(0.4)Ce_(0.6)O_(2)对碳烟的催化燃烧性能研究  

Study on Catalytic Combustion Performance of K-supported Sn_(0.4)Ce_(0.6)O_(2) for Soot

作　　者：张长森[1] 李聪聪[1] 代稳月 王登台 ZHANG Changsen;LI Congcong;DAI Wenyue;WANG Dengtai(School of Ecology and Environment,Zhengzhou University,Zhengzhou 450001,China;School of Chemistry,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学生态与环境学院,河南郑州450001 [2]郑州大学化学学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2023年第4期74-79,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：国家重点研发计划项目(2017YFC0212400)。

摘　　要：催化燃烧是目前去除柴油发动机尾气中碳烟颗粒最有效的净化技术之一。为提高催化剂表面原子的移动性能,改善催化剂的低温氧化还原能力,采用碱金属K负载Sn_(x)Ce_(1-x)O_(2)催化剂对碳烟的催化燃烧性能进行研究。利用共沉淀法将Sn和Ce按照不同的物质的量之比进行掺杂得到Sn_(x)Ce_(1-x)O_(2)催化剂,在微型固定床程序升温反应器上进行活性评价,发现n_(Sn)∶n_(Ce)=4∶6时催化剂具有最好的催化性能。而后通过浸渍法制备了一系列更高活性的xK/Sn-Ce催化剂,并对其进行了XRD、XPS、H_(2)-TPR、O_(2)-TPD等表征分析。结果表明:负载K之后的催化剂表面的活性氧的浓度得到了提高,氧转移速率加快,氧化还原能力得到了提高。当K负载量为15%(x=15%)时,催化剂对碳烟有最好的去除效果,产物中CO_(2)的选择性达到94.3%,T_(90)温度为388℃。该研究为设计高效的碳烟燃烧催化剂提供了重要参考。Catalytic combustion is one of the most effective purification technologies to remove soot particles from diesel engine exhaust.In order to improve the mobility of atoms on the catalyst surface and the low-temperature oxidation-reduction ability of the catalyst,the catalytic combustion performance of soot was studied by using alkali metal K-supported Sn_(x)Ce_(1-x)O_(2) catalyst.The Sn_(x)Ce_(1-x)O_(2) catalyst was obtained by doping Sn and Ce according to the ratio of different substances by co-precipitation method.The activity of the catalyst was evaluated in a micro fixed bed temperature programmed reactor,and it was found that the catalyst had the best catalytic performance when n_(Sn)∶n_(Ce)=4∶6.Then,a series of xK/Sn-Ce catalysts with higher activity were prepared by impregnation,and characterized by XRD,XPS,H_(2)-TPR,and O_(2)-TPD.The results showed that the concentration of active oxygen on the surface of loading K was increased,the oxygen transfer rate was accelerated,and the redox ability was improved.When the K loading was 15%(x=15%),the catalyst had the best removal effect on soot,the selectivity of CO_(2) in the product reached 94.3%,and the T_(90) temperature was 388℃.This research provided an important reference for the design of efficient soot combustion catalysts.

关 键 词：碳烟 催化氧化 共沉淀 碱金属 Sn_(0.4)Ce_(0.6)O_(2) 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]