Toward Rational Design of Cu/SSZ-13 Selective Catalytic Reduction Catalysts: Implications from Atomic-Level Understanding of Hydrothermal Stability

ACS Catalysis ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 8214-8227 ◽  
Author(s):  
James Song ◽  
Yilin Wang ◽  
Eric D. Walter ◽  
Nancy M. Washton ◽  
Donghai Mei ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Rational Design ◽  
Catalytic Reduction ◽  
Hydrothermal Stability ◽  
Atomic Level ◽  
Reduction Catalysts

Experimental and kinetic analysis of hydrothermal aging effects on ammonia adsorption capacity over a commercial Cu-zeolite selective catalytic reduction catalyst

2018 ◽  
Vol 233 (12) ◽  
pp. 3030-3042
Author(s):  
Tae Joong Wang ◽  
In Hyuk Im
Keyword(s):  
Adsorption Capacity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Adsorption Site ◽  
Selective Catalytic Reduction Catalyst ◽  
Aging Effects ◽  
Hydrothermal Aging ◽  
Ammonia Adsorption ◽  
Fresh Catalyst ◽  
Reduction Catalysts

Ammonia/urea selective catalytic reduction is an efficient technology to control NOx emission from diesel engines. One of its critical challenges is the performance degradation of selective catalytic reduction catalysts due to the hydrothermal aging experienced in real-world operations during the lifetime. In this study, hydrothermal aging effects on the reduction of ammonia adsorption capacity over a commercial Cu-zeolite selective catalytic reduction catalyst were investigated under actual engine exhaust conditions. Ammonia adsorption site densities of the selective catalytic reduction catalysts aged at two different temperatures of 750°C and 850°C for 25 h with 10% H2O were experimentally measured and compared to that of fresh catalyst on a dynamometer test bench with a heavy-duty diesel engine. The test results revealed that hydrothermal aging significantly decreased the ammonia adsorption capacity of the current commercial Cu-zeolite selective catalytic reduction catalyst. Hydrothermal treatment at 750°C reduced the ammonia adsorption site to 62.5% level of that of fresh catalyst, while hydrothermal treatment at 850°C lowered the adsorption site to 37.0% level of that of fresh catalyst. Also, in this study, numerical simulation and kinetic analysis were carried out to quantify the impact of hydrothermal aging on the reduction of ammonia adsorption capacity by introducing an aging coefficient. The kinetic parameter calibrations based on actual diesel engine tests with a commercial monolith Cu-zeolite selective catalytic reduction catalyst provided a highly realistic kinetic parameter set of ammonia adsorption/desorption and enabled a mathematical description of hydrothermal aging effect.

Hydrocarbon catalyzed-selective catalytic reduction catalysts using core-shell atomic layer deposited CeO2 and ZrO2

2019 ◽  
Vol 37 (2) ◽  
pp. 020919 ◽  
Author(s):  
David H. K. Jackson ◽  
Michael M. Schwartz ◽  
Chilan Ngo ◽  
Dustin Facteau ◽  
Svitlana Pylypenko ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Atomic Layer ◽  
Core Shell ◽  
Reduction Catalysts

Understanding Zn Functions on Hydrothermal Stability in a One-Pot-Synthesized Cu&Zn-SSZ-13 Catalyst for NH3 Selective Catalytic Reduction

ACS Catalysis ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 6197-6212 ◽  
Author(s):  
Ruinian Xu ◽  
Ziyang Wang ◽  
Ning Liu ◽  
Chengna Dai ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Stability ◽  
One Pot

Selective reduction of nitrogen oxides (NOx) by ammonia over honeycomb selective catalytic reduction catalysts

1993 ◽  
Vol 32 (6) ◽  
pp. 1053-1060 ◽  
Author(s):  
Jiri Svachula ◽  
Natale Ferlazzo ◽  
Pio Forzatti ◽  
Enrico Tronconi ◽  
Fiorenzo Bregani
Keyword(s):  
Nitrogen Oxides ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Selective Reduction ◽  
Reduction Catalysts
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