B改性钒钛催化剂低温NH3-SCR还原NOx

选择性催化还原(SCR)技术是降低柴油机NOx排放的常用技术,其核心部件为催化剂.目前最广泛使用的催化剂为V2O5/TiO2催化剂,但其存在一些缺点,如低温活性不佳、活性温度窗口较窄等.为了解决该催化剂存在的上述一系列问题,我们对V2O5/TiO2催化剂进行改性处理.采用溶胶-凝胶法和浸渍法制备了 B改性的V2O5/T...

Boron-modified Vanadia/titania Catalyst for Low-temperature NH3-SCR of NOx

Selective Catalytic Reduction (SCR) technology is a common method to reduce NOX emissions from diesel engines. The catalyst is the core component of the SCR process. The most widely used catalyst is V2O5/TiO2 catalyst, but it has some defects, such as poor low-temperature activity, narrow active temperature window, etc. In order to solve above-mentioned problems, a series of B-modified V2O5/TiO2 catalyst was prepared by the sol-gel and the impregnation methods. The activity test experiment of the B-modified catalyst was carried out on the catalyst activity test platform. The microstructure and acid site were investigated by XRD, BET and NH3-TPD methods. The results showed that the B modification could increase the specific surface area and the pore volume of the catalyst, and enhance the weak acid sites, which may result in high activity and stability of the catalyst. In addition, the effects of space velocity, O2 concentration, NH3/NO ratio, SO2 concentration and water vapor on the catalyst for selective catalytic reduction of NOx by NH3 were studied. The results show that the catalyst has preferable applicability and strong sulfur tolerance and hydrothermal stability.