化工学报 ›› 2019, Vol. 70 ›› Issue (3): 944-950.DOI: 10.11949/j.issn.0438-1157.20181110
收稿日期:
2018-10-02
修回日期:
2018-11-01
出版日期:
2019-03-05
发布日期:
2019-03-05
通讯作者:
郭杨龙
作者简介:
<named-content content-type="corresp-name">唐铨</named-content>(1993—),女,硕士研究生,<email>809704109@qq.com</email>|郭杨龙(1970—),男,博士,教授,<email>ylguo@ecust.edu.cn</email>
基金资助:
Quan TANG(),Yanglong GUO(
),Wangcheng ZHAN,Yun GUO,Li WANG,Yunsong WANG
Received:
2018-10-02
Revised:
2018-11-01
Online:
2019-03-05
Published:
2019-03-05
Contact:
Yanglong GUO
摘要:
以ZSM-5分子筛、铝溶胶、硝酸钯、硝酸铂和水为原料制备分子筛浆料,采用真空抽提-一次涂覆法在堇青石蜂窝陶瓷载体表面制备出PdxPty-ZSM-5/Cordierite整体式催化剂,考察了Pd负载量、ZSM-5分子筛的硅铝比和Pd/Pt质量比对整体式催化剂的丙烷催化燃烧性能的影响,并用超声波振荡、SEM、XRD、H2-TPR和C3H8-TPD等手段对整体式催化剂进行了表征。当球磨时间为60 min,分子筛浆料固含量为38%时,整体式催化剂的涂层上载量可达到178 g?L-1,涂层脱落率低于0.5%。Pd2Pt3-ZSM-5/Cordierite整体式催化剂(贵金属总负载量为1.2 g?L-1)对于丙烷的催化燃烧具有较好的催化活性(T50=259℃,T90=323℃)和稳定性,具有良好的工业应用前景,其中较低的ZSM-5分子筛硅铝比以及Pd和Pt之间的相互作用增加了对丙烷的吸附能力和表面活性氧物种的数量,从而提高了整体式催化剂的催化活性。
中图分类号:
唐铨, 郭杨龙, 詹望成, 郭耘, 王丽, 王筠松. 用于丙烷催化燃烧的PdxPty-ZSM-5/Cordierite整体式催化剂[J]. 化工学报, 2019, 70(3): 944-950.
Quan TANG, Yanglong GUO, Wangcheng ZHAN, Yun GUO, Li WANG, Yunsong WANG. Catalytic combustion of propane over PdxPty-ZSM-5/Cordierite monolithic catalyst[J]. CIESC Journal, 2019, 70(3): 944-950.
球磨时间/min | 黏度/(mPa·s) | 平均粒径/μm | 上载量/(g?L-1) | 脱落率/% |
---|---|---|---|---|
0 | 84 | 5.6 | 73 | 3.6 |
30 | 264 | 3.3 | 168 | 0.2 |
60 | 378 | 3.2 | 178 | 0.5 |
90 | 439 | 3.5 | 198 | 3.5 |
150 | 523 | 3.4 | 210 | 5.3 |
表1 不同球磨时间处理的浆料的涂覆效果比较
Table 1 Effect of milling time for slurry on washcoat performance
球磨时间/min | 黏度/(mPa·s) | 平均粒径/μm | 上载量/(g?L-1) | 脱落率/% |
---|---|---|---|---|
0 | 84 | 5.6 | 73 | 3.6 |
30 | 264 | 3.3 | 168 | 0.2 |
60 | 378 | 3.2 | 178 | 0.5 |
90 | 439 | 3.5 | 198 | 3.5 |
150 | 523 | 3.4 | 210 | 5.3 |
催化剂 | T50/℃ | T90 /℃ |
---|---|---|
Pd-ZSM-5/Cordierite | 302 | 342 |
Pd4Pt1-ZSM-5/Cordierite | 337 | 383 |
Pd2Pt3-ZSM-5/Cordierite | 259 | 323 |
Pd3Pt2-ZSM-5/Cordierite | 293 | 337 |
Pd1Pt4-ZSM-5/Cordierite | 301 | 374 |
Pt-ZSM-5/Cordierite | 319 | 403 |
表2 Pd/Pt质量比对整体式催化剂催化活性的影响
Table 2 Effect of mass ratio of Pd/Pt on catalytic activity of monolithic catalysts
催化剂 | T50/℃ | T90 /℃ |
---|---|---|
Pd-ZSM-5/Cordierite | 302 | 342 |
Pd4Pt1-ZSM-5/Cordierite | 337 | 383 |
Pd2Pt3-ZSM-5/Cordierite | 259 | 323 |
Pd3Pt2-ZSM-5/Cordierite | 293 | 337 |
Pd1Pt4-ZSM-5/Cordierite | 301 | 374 |
Pt-ZSM-5/Cordierite | 319 | 403 |
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