Insight of platinum poisoning Cu/SAPO-34 during NH3-SCR and its promotion on catalysts regeneration after hydrothermal treatment

被引：42

作者：

Yu, Tie ^{[1
,2
,4
]}

Xu, Minhong ^{[1
]}

Huang, Yu ^{[1
]}

Wang, Jianqiang ^{[1
]}

Wang, Jun ^{[1
]}

Lv, Liangfang ^{[1
]}

Qi, Gongshin ^{[4
]}

Li, Wei ^{[4
]}

Shen, Meiqing ^{[1
,3
]}

机构：

[1] Tianjin Univ, Sch Chem Engn &Technol, Key Lab Green Chem Technol State Educ Minist, Tianjin 300072, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Zhongshan Rd 457, Dalian 116023, Peoples R China

[3] Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China

[4] Gen Motors Global Res & Dev, Chem Sci & Mat Syst Lab, 3500 Mound Rd, Warren, MI 48090 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2017年 / 204卷

基金：

中国国家自然科学基金;

关键词：

NH3-SCR; SAPO-34; Hydrothermal treatment; Regeneration; Platinum; IN-SITU DRIFTS; ACTIVE-SITES; REDUCTION; NH3; NOX; AMMONIA; STABILITY; CU-SSZ-13; OXIDATION; SCR;

D O I：

10.1016/j.apcatb.2016.12.007

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This study mainly focused on selective catalytic reduction of air pollutants NOx by ammonia (NH3-SCR), and a series of Pt impregnated Cu/SAPO-34 (homemade) samples were employed to elucidate its negative impact on DeNOx activity and hydrothermal treatment's acceleration on NH3-SCR activity resurgence. Firstly, XRD, NH3-TPD and DRIFTs were performed to examine platinum interaction with zeolites structure and contribution to acidity. Then, Pt inhibition on NH3-SCR activity Was evaluated and its impact on reaction network, including ammonia oxidation, NO oxidation and NO + NH3, was concluded based on gas switching tests. H-2-TPR and EPR further reflected various Cu species coordination and redox capacity variation caused by platinum doping. It was intriguing to find out that the further hydrothermal treatment benefited rejuvenation of Pt-poisoned Cu/SAPO-34 and even activity enhancement from Pt presence under the condition of zeolites structure integrity. Hydrothermal treatment induced platinum sintering and STEM illustrated platinum species combined with copper oxides and generated oxo-complexes, weakening ammonia oxidation. And Pt presence promoted copper oxides further dispersion during hydrothermal treatment. Finally, platinum poisoning on Cu/SAPO-34 and its regeneration after hydrothermal treatment were concluded to indicate their application potential. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：525 / 536

页数：12

共 42 条

[1] REACTIVITY AND PHYSICOCHEMICAL CHARACTERIZATION OF V2O5-WO3/TIO2 DE-NOX CATALYSTS [J].