Experimental and Modelling Study of Cold Start Effects on a Cu-Zeolite NH3 Selective Catalytic Reduction Catalyst

2015 ◽  
Author(s):  
Peter I. Chigada ◽  
Timothy C. Watling ◽  
Jason P. Cleeton ◽  
Miroslaw Gall ◽  
James A. Wylie
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Cold Start ◽  
Selective Catalytic Reduction Catalyst ◽  
Modelling Study

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.

Effect of manganese and/or ceria loading on V2O5–MoO3/TiO2 NH3 selective catalytic reduction catalyst

2020 ◽  
Vol 38 (7) ◽  
pp. 725-734 ◽  
Author(s):  
Daojun Zhang ◽  
Ziran Ma ◽  
Baodong Wang ◽  
Tao Zhu ◽  
Duan Weng ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Selective Catalytic Reduction Catalyst

scholarly journals Simultaneous soot combustion and NO x reduction over a vanadia-based selective catalytic reduction catalyst

2018 ◽  
Vol 21 (3-4) ◽  
pp. 221-231 ◽  
Author(s):  
Julie Schobing ◽  
Valérie Tschamber ◽  
Jean-François Brilhac ◽  
Aglaé Auclaire ◽  
Yves Hohl
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Selective Catalytic Reduction Catalyst ◽  
Soot Combustion

scholarly journals Surface Characteristics of Porous Coconut Shell Carbon Impregnated with Bimetallic Catalysts

2014 ◽  
Vol 695 ◽  
pp. 16-19
Author(s):  
Yakub Ibrahim ◽  
Anwar Mohd Said Khairul ◽  
Norsuzailina Mohamed Sutan ◽  
Yun Hin Taufiq-Yap ◽  
Mahmud Surahim
Keyword(s):  
Selective Catalytic Reduction ◽  
Bimetallic Catalysts ◽  
Catalytic Reduction ◽  
Nitrogen Adsorption ◽  
Ambient Air ◽  
Temperature Programmed Desorption ◽  
Coconut Shell ◽  
Synthesis Process ◽  
Selective Catalytic Reduction Catalyst ◽  
Temperature Programmed

Selective Catalytic Reduction catalyst (Cu-Mn/CSC) was derived from coconut shell carbon (CSC). The bimetallic catalysts, Copper and Manganese (Cu-Mn), were deposited onto CSC using wet impregnation technique while the calcination stage was performed under low temperature ambient air. The samples were then characterized using nitrogen adsorption-and-desorption, carbon dioxide temperature-programmed desorption, ammonia temperature-programmed desorption, hydrogen temperature-programmed reduction as well as scanning electron microscopy. The results showed that the synthesis process increased the external surface area and regulated the distribution of slit-shape pores on Cu-Mn/CSC. Besides, Cu-Mn was found to be reduced and the surface has more acidic groups compared to basic. These findings indicated the potential of using CSC as a precursor for NOx-Selective Catalytic Reduction catalyst.

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