Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst
Journal Title: Energy Environmental Protection - Year 2023, Vol 37, Issue 6
Abstract
Nitrogen oxides (NO_x) from diesel exhaust can induce severe air pollution problems. Selective catalytic reduction of NO_x with NH_3( NH_3-SCR) is the dominant technology for NO_x abatement from diesel vehicles, and Cu-SSZ-13, with excellent NH_3 -SCR activity and hydrothermal stability, has been widely used as the NH_3 -SCR catalyst on diesel vehicles of China VI. In the aftertreatment system of diesel vehicles, Cu-SSZ-13 catalyst can be poisoned by the migration of noble metals from oxidation catalysts, and its NH_3-SCR performance will be affected. In this study, the effects of noble metals with different types and concentrations on the performances of Cu-SSZ-13 catalyst were investigated, and the regeneration effects of hydrothermal aging on noble metal poisoning were also analyzed. When the loading amount of noble metal reached a certain level, the performance of Cu-SSZ-13 was significantly affected, especially the high temperature activity. Hydrothermal aging could restore the NO_x conversion of poisoned catalyst to a certain extent, but the formation of N_2O as a byproduct waspromoted. Noble metals of Pt and Pd had similar effects on Cu-SSZ-13. The results of XRD (X-ray diffraction) and N_2 physical adsorption showed that the noble metals had no obvious influence on thestructure of Cu-SSZ-13, but they could slightly reduce the specific surface area and pore volume ofthe catalyst. According to the results of separate NH_3 oxidation and NO oxidation, noble metal poisoning could promote the occurrence of side reactions and induce over consumption of NH_3, thus decreasing the NO_x conversion over Cu-SSZ-13 due to lack of reducing agent. This study is helpful to understand the poisoning effects and mechanism of noble metals on commercial Cu-SSZ-13 catalyst for NH_3-SCR.
Authors and Affiliations
XUE Sen|Weichai Power Co., Ltd., China, DING Wenqing|State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco- Environmental Sciences, Chinese Academy of Sciences, China, Ganjiang Innovation Academy, Chinese Academy of Sciences, China, School of Chemistry and Chemical Engineering, Nanchang University, China, HAN Xuewang|Weichai Power Co., Ltd., China, CAO Hehe|State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, China, Ganjiang Innovation Academy, Chinese Academy of Sciences, China, ZHANG Yan|Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, China, YU Yunbo|State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, China,|Ganjiang Innovation Academy, Chinese Academy of Sciences, China, SHAN Yulong|State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, China, SHAN Wenpo*|Ganjiang Innovation Academy, Chinese Academy of Sciences, China, Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, China
Keywords
Related Articles
- EP ID EP738041
- DOI 10.20078/j.eep.20230402
- Views 74
- Downloads 0
Advances in biomass-based thermochemical hydrogen production technology
The excessive utilization of fossil fuels has caused the energy crisis and greenhouse effect, and the development of clean and sustainable sources can adjust the energy structure of China and promote green and sustainabl...
Research progress of biomass activated carbon regeneration technology
Biomass activated carbon regeneration technology is widely used for environmental treatment and resource recovery. Various regeneration methods are available, including thermal, chemical, microwave, electrochemical, biol...
Progress in oxidative degradation and recovery of polyolefin plastics
Polyolefin plastics play an important role in both production and life due to the excellent characteristics, such as east processing, low price and outstanding performance. It has become the most widely used plastics at...
Advances in the removal of emerging contaminants from water mediated by chemically modified biochar
Emerging contaminants are pollutants with relatively low concentration but high toxicity. They can be enriched in living organisms and transferred to the human body through the food chain, posing a significant threat to...
Simulation of mixed flow characteristics of distiller’s grains-wastewater for anaerobic fermentation
Anaerobic fermentation of distiller's grains (DG) is an effective method to treat DG. The DG separation technology, based on a hydraulic pulper, simplifies equipment and reduces energy consumption while ensuring the sepa...