Thermal stability of vanadia SCR catalysts for the use in diesel applications

High-temperature and high-concentration SCR of NO with NH3: Application in a CCS process for removal of carbon dioxide

“…Our values were 0.00033 and 43.9 m 2 /g respectively for catalyst A meaning that S eq is 66.8 % of the unsintered value. Thus catalyst A is more stable at 525 °C than the 10 % from ref [18] is at 600 °C in dry air. This could be caused by the presumably lower content of vanadia in catalyst A but also the lower temperature and the absence of water vapor.…”

“…This There is a thorough study on the sintering of 10, 20 and 30 % V 2 O 5 on silica-titania [18]. The changes in BET surface area were evaluated by for instance the GPLE method.…”

“…Samples were sintered for various lengths of time ranging from 15 to 777 h. At the 777 h treatment porcelain ships were used instead since they produced much lower scatter in data than the Pt crucibles. The time dependency of the surface area of sintered materials can be represented by the general power law equation (GPLE) [18].…”

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

“…Such concerns are common to the processes implemented to treat exhaust gases from stationary and mobile sources with some nuances with respect to their operating conditions, i. e. temperature and composition of tail gas and automotive exhaust, concentration of the atmospheric pollutants. Indeed, catalytic processes for stationary sources are probably more prone to poisoning effects whereas thermal aging can represent more specifically an important issue for mobile applications [8] in particular with the development of innovative compact technologies through the coating of the SCR catalyst on the DPF. Anyway, the long term efficiency at high or moderate temperature as well as the tolerance to poisoning effects at low temperature, i. e. cold start engines, are common concerns for V 2 O 5 ÀWO 3 /TiO 2 irrespective of their application.…”

Prediction method and practice of catalyst performance for SCR denitrification system

“…At present,Selective Catalytic Reduction (SCR),as a a main technical method for reducing the NOx emissions from coal-fired flue gas,has many advantages such as well selectivity, strong stability and high denitrification efficiency,which is widely used in coal-fired power plant.However, for the flue gas denitrification device,many scholars' research found that the catalytic activity of SCR was significantly decreased with the increase of the operating time,and similarly the denitrification performance decreased with the running time [2][3][4][5][6].So why?Probably the main reason is that the catalyst is affected by the fly ash, erosion and chemical poisoning [7].Therefore, the catalyst needs to be added periodically or replaced regularly to ensure the normal and efficient operation of the denitrification system and meet the requirements of the state on the nitrogen oxide emission in coal-fired power plants.So it is very significant for the performance evaluation and life prediction of the denitrification catalyst in coal-fired power plants, as well as the comprehensive understanding for the operating conditions of the catalyst and making the plan for catalyst management in coal-fired power plants.…”