A comparison of hydrothermal aging effects on NH3-SCR of NO  over Cu-SSZ-13 and Cu-SAPO-34 catalysts

Wang, Di; Jangjou, Yasser; Liu, Yong; Sharma, Munish K.; Luo, Jinyong; Li, Junhui; Kamasamudram, Krishna; Epling, William S.

doi:10.1016/j.apcatb.2014.10.020

Cited by 290 publications

(166 citation statements)

References 34 publications

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“…It can be expected that such a process depends on temperature, aging time and Cu loading, where higher aging temperatures, longer aging durations and higher Cu loadings promote more damage. Prior literature is fully in line with this structure damage mechanism [39][40][41]53,61] On the other hand, dealumination alone is apparently much less destructive for this zeolite catalyst.…”

Section: Towards Rational Design Of Cu/ssz-13mentioning

confidence: 59%

Recent Progress in Atomic-Level Understanding of Cu/SSZ-13 Selective Catalytic Reduction Catalysts

2018

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Cu/SSZ-13 Selective Catalytic Reduction (SCR) catalysts have been extensively studied for the past five-plus years. New and exciting fundamental and applied science has appeared in the literature quite frequently over this time. In this short review, a few topics specifically focused on a molecular-level understanding of this catalyst are summarized: (1) The nature of the active sites and, in particular, their transformations under varying reaction conditions that include dehydration, the presence of the various SCR reactants and hydrothermal aging; (2) Discussions of standard and fast SCR reaction mechanisms. Considerable progress has been made, especially in the last couple of years, on standard SCR mechanisms. In contrast, mechanisms for fast SCR are much less understood. Possible reaction paths are hypothesized for this latter case to stimulate further investigations; (3) Discussions of rational catalyst design based on new knowledge obtained regarding catalyst stability, overall catalytic performance and mechanistic catalytic chemistry.

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Section: Towards Rational Design Of Cu/ssz-13mentioning

confidence: 59%

Recent Progress in Atomic-Level Understanding of Cu/SSZ-13 Selective Catalytic Reduction Catalysts

2018

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“…All these observations indicate mechanistic differences between the two catalysts, although the decrease in conversion was absent in certain other studies [8,10].…”

Section: Introductionmentioning

confidence: 74%

“…Most of these recent studies have been focusing on Cu/SSZ-13 [6] and Cu/SAPO-34 [7,8], which are both of the chabazite structure, but have different elemental compositions. Cu/SAPO-34, in particular, is capable of withstanding higher aging temperatures than Cu/SSZ-13 [9,10].…”

Section: Introductionmentioning

confidence: 96%

Comparison of Cu/BEA, Cu/SSZ-13 and Cu/SAPO-34 for ammonia-SCR reactions

et al. 2015

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“…1 Among the catalysts developed for the SCR process, the transition metal exchanged zeolites have excellent SCR performance. 5,11,12,13 The working temperature of SCR catalyst can occasionally exceed 800 °C with the regular regeneration of upstream DPF module with water in the exhaust of diesel engines. [5][6][7][8][9][10] Despite the successful application, the SCR catalysts still faces some challenges concerning the framework stability during hydrothermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Correlation of the changes in the framework and active Cu sites for typical Cu/CHA zeolites (SSZ-13 and SAPO-34) during hydrothermal aging

Peng

et al. 2015

Phys. Chem. Chem. Phys.

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The relative framework stability of Cu/CHA zeolites (SAPO-34 and SSZ-13) was studied during hydrothermal aging at 800 °C, and the fundamental mechanism for the framework change was investigated. Additionally, the relationship between the variation in the framework and active SCR reaction sites was established. SAPO-34 showed stronger stability during hydrothermal aging than SSZ-13. The results showed that dealumination occurred in the SSZ-13 zeolite, leading to the loss of crystallinity and a severe decrease of the Brönsted acid sites. Simultaneously, the detached Al(OH)3 species deactivated the Cu species by the transformation of isolated Cu(2+) ions to CuAlOx species. While the vacancy in the SAPO-34 framework caused by desilication could be healed with the migration of extra-framework Al and P atoms to the defects. And the Cu species showed a certain degree of aggregation with the improved redox ability of the aged Cu/SAPO-34 zeolite and the acidic properties were well maintained.

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A comparison of hydrothermal aging effects on NH3-SCR of NO over Cu-SSZ-13 and Cu-SAPO-34 catalysts

Cited by 290 publications

References 34 publications

Recent Progress in Atomic-Level Understanding of Cu/SSZ-13 Selective Catalytic Reduction Catalysts

Recent Progress in Atomic-Level Understanding of Cu/SSZ-13 Selective Catalytic Reduction Catalysts

Comparison of Cu/BEA, Cu/SSZ-13 and Cu/SAPO-34 for ammonia-SCR reactions

Correlation of the changes in the framework and active Cu sites for typical Cu/CHA zeolites (SSZ-13 and SAPO-34) during hydrothermal aging

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