封装型Ni基催化剂对煤焦油模型化合物催化转化的性能研究  

Study on conversion performance of encapsulated Ni-based catalysts for coal tar model compounds

作　　者：董子豪 王明义 李文林 贾鹏 吴华帅 王俊文[1] DONG Zihao;WANG Mingyi;LI Wenlin;JIA Peng;WU Huashuai;WANG Junwen(College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学化学工程与技术学院,山西太原030024

出　　处：《低碳化学与化工》2024年第4期71-78,共8页Low-Carbon Chemistry and Chemical Engineering

基　　金：山西省基础研究计划(202103021223087);省部共建煤炭高效利用与绿色化工国家重点实验室开放课题(2021-K67)。

摘　　要：为提高煤热解焦油中轻质组分含量,定向调控焦油裂解产物,采用原位封装法制备了Ni基催化剂(xNi@HZSM-5,x表示Ni含量,质量分数),并考察了其对焦油模型化合物荧蒽和芘的催化转化作用。结果表明,在N_(2)气氛下,xNi@HZSM-5的荧蒽和芘的转化率区别较小;在H_(2)气氛下,2.0Ni@HZSM-5的荧蒽和芘具有最大转化率,分别为51.91%和46.21%,且2.0Ni@HZSM-5比采用浸渍法制备的2.0Ni/HZSM-5(Ni质量分数为2.0%)具有更高的稳定性。采用X射线衍射(XRD)、透射电子显微镜(TEM)和N_(2)吸/脱附等表征方法对催化剂进行了分析表征。结果表明,2.0Ni@HZSM-5比2.0Ni/HZSM-5具有更大的比表面积和总孔容,且Ni位于分子筛孔道内部,具有更高的活性和稳定性。通过不同气氛下模型化合物的转化产物的分析,推测了荧蒽与芘在催化转化过程中的反应路径。In order to increase the content of light fractions in coal pyrolysis tar and regulate tar cracking products in a targeted manner,Ni-based catalysts(xNi@HZSM-5,x is Ni content,mass fraction)were prepared by in situ encapsulation,and their catalytic conversion effects on tar model compounds:fluoranthene and pyrene were investigated.The results show that the difference of the xNi@HZSM-5 conversion rates of two model compounds under N_(2) atmosphere is relatively small.Under H_(2) atmosphere,2.0Ni@HZSM-5 has the maximum conversion rates of fluoranthene and pyrene,which are 51.91%and 46.21%,respectively.And 2.0Ni@HZSM-5 has higher stability than 2.0Ni/HZSM-5(Ni mass fraction is 2.0%)prepared by impregnation method.The catalysts were analyzed and characterized by characterization methods such as X-ray diffraction(XRD),transmission electron microscope(TEM)and N_(2) adsorption/desorption,etc.The results show that 2.0Ni@HZSM-5 has larger specific surface area and pore volume than 2.0Ni/HZSM-5,and Ni is located inside the molecular sieve pores,which has higher activity and stability.The reaction paths of fluoranthene and pyrene during catalytic conversion were deduced by analyzing the conversion products of model compounds under different atmospheres.

关 键 词：封装型催化剂 HZSM-5分子筛 模型化合物 反应机理 

分 类 号：TQ523[化学工程—煤化学工程]