Chemical Deactivation by Phosphorous under Lean Hydrothermal Conditions over Cu/BEA NH3-SCR Catalysts

Chemical Deactivation by Phosphorous under Lean Hydrothermal Conditions over Cu/BEA NH3-SCR Catalysts Научная публикация

Журнал

Applied Catalysis B: Environmental
ISSN: 0926-3373

Вых. Данные

Год: 2014, Том: 147, Страницы: 251-263 Страниц : 13 DOI: 10.1016/j.apcatb.2013.08.041

Авторы

Andonova Stanislava ¹ , Vovk Evgeny ^2,3 , Sjoblom Jonas ⁴ , Ozensoy Emrah ² , Olsson Louise ¹

Организации

1	Competence Centre for Catalysis, Chemical Engineering, Chalmers University, 412 96 Gothenburg, Sweden
2	Chemistry Department, Bilkent University, 06800 Bilkent, Ankara, Turkey
3	Boreskov Institute of Catalysis, 630090 Novosibirsk, Russian Federation
4	Applied Mechanics, Chalmers University, 412 96 Gothenburg, Sweden

To obtain a better understanding of the deactivation of SCR catalysts that may be encountered due to the presence of P-containing impurities in diesel exhausts, the effects induced by P over Cu/BEA NH3-SCR catalysts were studied as functions of the temperature of poisoning and P concentration in the feed. Cu/BEA catalysts with different Cu loadings (4 and 1.3 wt% Cu) were exposed to P by controlled evaporation of H3PO4 in the presence of 8% O2 and 5% H2O at 573 and 773 K. The reaction studies were performed by NH3-storage/TPD, NH3/NO oxidation and standard NH3-SCR. In addition, a combination of several characterisation techniques (ICP–AES, BET surface area, pore size distribution, H2-TPR and XPS) was applied to provide useful information regarding the mechanism of P deactivation. Pore condensation of H3PO4 in combination with pore blocking was observed. However, the measured overall deactivation was found to occur mostly by chemical deactivation reducing the number of the active Cu species and hence deteriorating the redox properties of the Cu/BEA catalysts. The process of P accumulation on the surface preferentially occurs on the “over exchanged” Cu active sites with the formation of phosphate species. This is likely the reason for the more severe deactivation of the 4% Cu/BEA compared to 1.3% Cu/BEA. Further, the higher NOx reduction performance at 773 K of the P-poisoned Cu/BEA catalysts was found to originate from the lower selectivity towards NH3 oxidation, which occurs predominately on the “over-exchanged” sites.

Andonova S. , Vovk E. , Sjoblom J. , Ozensoy E. , Olsson L.
Chemical Deactivation by Phosphorous under Lean Hydrothermal Conditions over Cu/BEA NH3-SCR Catalysts

Applied Catalysis B: Environmental. 2014. V.147. P.251-263. DOI: 10.1016/j.apcatb.2013.08.041 WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact

Полный текст от издателя

Поступила в редакцию:	5 июл. 2013 г.
Принята к публикации:	27 авг. 2013 г.
Опубликована online:	1 сент. 2013 г.
Опубликована в печати:	5 апр. 2014 г.

Web of science:	WOS:000330489400029
Scopus:	2-s2.0-84884546991
РИНЦ:	21662616
Chemical Abstracts:	2013:1971067
Chemical Abstracts (print):	160:164878
OpenAlex:	W2111320013
Sciact:	1019

БД	Цитирований
Scopus	55
OpenAlex	53