Influence of lattice stability on hydrothermal deactivation of Cu-ZSM-5 and Cu-IM-5 zeolites for selective catalytic reduction of NOx by NH3

Vennestrøm, Peter N. R.; Janssens, Ton V. W.; Kustov, Arkadii; Grill, Marie; Puig-Molina, A.; Lundegaard, L. F.; Tiruvalam, Ramchandra R.; Concepción, Patricia; Corma, Avelino

doi:10.1016/j.jcat.2013.10.017

Cited by 125 publications

(92 citation statements)

References 60 publications

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“…In Cu/ZSM-5, severe Cu and Al aggregation was demonstrated and mapped in 3D and a Cu/Al atomic ratio of~2 for the aggregates indicates formation of copper aluminate. Similarly, irreversible formation of a Cu-Al phase was confirmed via XAFS measurements in a study by Vennestrøm et al [42] for aged Cu/ZSM-5. In both studies, a phase similar to CuAl 2 O 4 spinel was suggested.…”

Section: Hydrothermal Agingsupporting

confidence: 52%

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

Gao

Peden

2018

Catalysts

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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: Hydrothermal Agingsupporting

confidence: 52%

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

Gao

Peden

2018

Catalysts

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“…7. CO as probe molecular is sensitive to the nature and environment of Cu + ions [25]. CO adsorption experiment was conducted to identify Cu + ions and calculate the relative amount of Cu + ions.…”

Section: Ir Spectra Of Co Adsorptionmentioning

confidence: 99%

Potassium poisoning on Cu-SAPO-34 catalyst for selective catalytic reduction of NOx with ammonia

Weng

et al. 2015

Chemical Engineering Journal

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“…Among these are, as in the case of AIE, the need of using numerous operation steps and arising difficulties to overcome steric hindrance caused by the formation of large solvation shells for some multivalent metal ions [3], and, as in the case of SSIE, the need of high temperatures that may cause partial or complete zeolite framework destruction. Recently, however, it was shown that in the presence of ammonia, zeolites can be functionalized with copper by SSIE at low temperatures [15,16]. In contrast to conventional SSIE, which requires high temperatures, typically above 700 • C, Shwan et al showed that copper-exchanged zeolites (*BEA, MFI and CHA) can be prepared by exposing physical mixtures of zeolite and copper oxide to NH 3 or NH 3 and NO already at 250 • C [16].…”

Section: Introductionmentioning

confidence: 99%

Functionalization of SSZ-13 and Fe-Beta with Copper by NH3 and NO Facilitated Solid-State Ion-Exchange

et al. 2017

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Abstract:We show that functionalization of SSZ-13 (CHA) and Fe-beta (*BEA) with copper using a recently reported solid-state ion-exchange method, facilitated by NH 3 and nitrogen oxides (NO), is a viable route to prepare Cu-SSZ-13 and (Cu + Fe)-beta catalysts, starting from H-SSZ-13 and Fe-beta, respectively. The physicochemical properties of the prepared catalysts are characterized by XRD, UV-Vis-spectroscopy and STEM-EDS, confirming that copper originally present in the physical mixture of CuO and H-SSZ-13, and CuO and Fe-beta, is inserted into the micropores of SSZ-13 and Fe-beta, respectively. Activity measurements in gas-flow reactor show that the samples are active for NO reduction by NH 3 -SCR over a broad temperature range, i.e., 150-500 • C. For the Cu-SSZ-13 catalysts, which have a copper loading range of 0.5-4 wt. %, the sample prepared from the physical mixture with a CuO/SSZ-13 ratio corresponding to 2 wt. % Cu is the most active catalyst for NH 3 -SCR under the present reaction conditions. Furthermore, the (Cu + Fe)-beta catalyst shows higher NH 3 -SCR activity over a broader temperature range and especially at low temperature as compared to the Fe-beta and Cu-beta counterparts. The results encourage further elaboration on sequential ion-exchange procedures for bimetallic functionalization of zeolites.

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Influence of lattice stability on hydrothermal deactivation of Cu-ZSM-5 and Cu-IM-5 zeolites for selective catalytic reduction of NOx by NH3

Cited by 125 publications

References 60 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

Potassium poisoning on Cu-SAPO-34 catalyst for selective catalytic reduction of NOx with ammonia

Functionalization of SSZ-13 and Fe-Beta with Copper by NH3 and NO Facilitated Solid-State Ion-Exchange

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