Excellent activity and selectivity of Cu-SSZ-13 in the selective catalytic reduction of NOx with NH3

Kwak, Ja Hun; Tonkyn, Russell G.; Kim, Do Heui; Szanyi, János; Peden, Charles H. F.

doi:10.1016/j.jcat.2010.07.031

Cited by 714 publications

(496 citation statements)

References 10 publications

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“…Low hydrothermal stability of majority of zeolites is claimed to be surpassed by the process of ultra-stabilization which was discovered for Y zeolite and also investigated in our previous paper for Cu-USY [11]. Recently small pore size zeolite-SSZ-13 of chabazite (CHA) structure has received a lot of attention due to its high hydrothermal stability, high activity in SCR and high selectivity to N 2 [12,13]. Also, the catalyst producers has begun to offer zeolitic catalyst designed for higher temperature operation window than the classic vanadia based SCR catalysts.…”

Section: Introductionmentioning

confidence: 91%

Prospective Catalytic Structured Converters for NH3-SCR of NOx from Biogas Stationary Engines: In Situ Template-Free Synthesis of ZSM-5 Cu Exchanged Catalysts on Steel Carriers

et al. 2013

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The main objective of this study is to develop highly active catalyst and its preparation method that would meet the requirements of steel carriers for shortchannel structured converters for NO x abatement from stationary biogas engines. The in situ synthesis was applied to deposit a series of Cu-exchanged MFI zeolite (ZSM-5) on kanthal sheets. The samples differ in preparation conditions: organic template assisted and template-free synthesis, Si/Al ratio and catalyst carrier pretreatment (calcined vs. non-calcined). Dip-coating method was used as a reference to compare loading efficiency. In order to evaluate preparation quality and purity of resulting structure the samples were examined by XRD and SEM/EDS at various stages of preparation. For the assessment of mechanical endurance of the deposited catalyst layers the ultrasonication method was used. The results demonstrated high depositing efficiency of the in situ synthesis as well as high activity and selectivity of the Cu-exchanged MFI samples prepared without costly organic template.

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Section: Introductionmentioning

confidence: 91%

Prospective Catalytic Structured Converters for NH3-SCR of NOx from Biogas Stationary Engines: In Situ Template-Free Synthesis of ZSM-5 Cu Exchanged Catalysts on Steel Carriers

et al. 2013

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“…Nevertheless, Figure 2B clearly shows that at 500 °C, for both studied copper loading, sodium impregnation in ethanol (red lines) had few impact on the NOx conversion up to 14,200 ppm Na content. On the opposite, strong deactivations were denoted when Na was impregnated in water Catalysts 2018, 8,3 Na in water. This first result already predicts an effect of the sodium solven properties of the materials.…”

Section: Catalytic Activitymentioning

confidence: 99%

“…In order to illustrate the influence of both sodium content and sodi (water or ethanol) on the deNOx efficiency of both Cu2.8/FER and representative temperatures were selected: 250 °C was chosen to compar "low" temperature, while 500 °C was selected for the "high" temperatu compares the loss of the NOx conversion (expressed as a percentage of lo : Cu 2.8 /FER; Catalysts 2018, 8,3 Na in water. This first result already predicts an effect of the sodium solvent towa properties of the materials.…”

Section: Catalytic Activitymentioning

confidence: 99%

Influence of the Sodium Impregnation Solvent on the Deactivation of Cu/FER-Exchanged Zeolites Dedicated to the SCR of NOx with NH3

et al. 2017

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Abstract:The effect of the sodium addition mode was investigated on model Cu/FER selective catalytic reduction (SCR) catalysts with two copper loadings (2.8 wt. % and 6.1 wt. %) in order to compare samples with or without over-exchanged copper. Na was added by wet-impregnation using two solvents: water or ethanol. Catalysts were evaluated in Standard and Fast-SCR conditions, as well as in NO and NH 3 oxidation. They were characterized by H 2 -TPR, NO and NH 3 adsorption monitored by FT-IR. As expected, whatever the copper loading, ammonia adsorption capacity was decreased by Na additions. Interestingly, characterizations also showed that Na impregnation in water favors the migration of the Cu-exchanged species, leading to the formation of CuO extra-framework compounds. Consequently, for both copper loadings, Na impregnation in water led to a stronger catalyst deactivation than impregnation in ethanol. Finally, the NO x conversion at low temperature (250 • C) appeared mainly affected by the loss in NH 3 adsorption capacity whereas the deNO x deactivation at high temperature (500 • C) was rather governed by the decrease in the exchanged copper ratio, which also induced a partial inhibition of NO and NH 3 oxidation behaviors.

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“…Copper-containing small-pore zeolites such as Cu-SAPO-34 and Cu-SSZ-13 have been attracting increasing attention as superior NH 3 -SCR catalysts [1][2][3][4][5][6]. The Cu-SAPO-34 catalyst showed excellent SCR activity over a wide range of temperature and quite outstanding hydrothermal stability at high temperatures [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A novel one-pot synthesized CuCe-SAPO-34 catalyst with high NH3-SCR activity and H2O resistance

Niu

Shi

et al. 2016

Catalysis Communications

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CuCe-SAPO-34 catalysts based on the one-pot hydrothermal synthesis method were prepared for the first time. The addition of Ce suppressed the formation of CuO and increased the amount of active Cu 2+ , resulting in better NH 3 -SCR activity than Cu-SAPO-34. Ce greatly improved the H 2 O resistance during the SCR process by stabilizing the zeolite structure and obstructing the transformation of active Cu 2+ into inactive forms.

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Excellent activity and selectivity of Cu-SSZ-13 in the selective catalytic reduction of NOx with NH3

Cited by 714 publications

References 10 publications

Prospective Catalytic Structured Converters for NH3-SCR of NOx from Biogas Stationary Engines: In Situ Template-Free Synthesis of ZSM-5 Cu Exchanged Catalysts on Steel Carriers

Prospective Catalytic Structured Converters for NH3-SCR of NOx from Biogas Stationary Engines: In Situ Template-Free Synthesis of ZSM-5 Cu Exchanged Catalysts on Steel Carriers

Influence of the Sodium Impregnation Solvent on the Deactivation of Cu/FER-Exchanged Zeolites Dedicated to the SCR of NOx with NH3

A novel one-pot synthesized CuCe-SAPO-34 catalyst with high NH3-SCR activity and H2O resistance

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