Study on rapid aging method of CNG catalyst
2022-01-0703
03/29/2022
- Event
- Content
- China VI standards for heavy duty vehicles require that the mileage of CNG catalysts for vehicles with a maximum design total mass of more than 18 tons should reach 700000 km. In order to quickly evaluate the durability of CNG catalyst, muffle furnace aging and natural gas engine bench aging are usually adopted. The advantages of muffle furnace aging are simple operation, short time and low cost, but the aging atmosphere is quite different from the exhaust atmosphere of natural gas engine, which is difficult to reflect the actual durability of the catalyst. The aging of natural gas engine can reflect the durability of the catalyst, but it usually takes about 1000 hours. Due to long time, and high cost, it is difficult to be widely applied in the early stage of catalyst development. In addition, because the combustion of natural gas is difficult to be accurately controlled, misfire often occurs, resulting in the instantaneous bed temperature of catalyst up to more than 1000 ℃, which may cause the complete failure of catalyst. Therefore, it is a very interesting research direction to develop new methods with the advantages of muffle furnace aging and natural gas bench aging. In this work, the effect of water content on catalyst performance during muffle furnace aging was studied and compared with gasoline engine bench aging. It is found that the aging speed of the catalyst is accelerated when the water content is increased in a certain range. Gasoline engine bench can reach the same aging level as muffle furnace aging in a considerable period of time, which is very important for guiding the establishment of a new rapid aging method of CNG catalyst.
- Citation
- Wang, W., Li, X., and Yue, J., "Study on rapid aging method of CNG catalyst," SAE Technical Paper 2022-01-0703, 2022, .