Selective catalytic reduction (SCR) is currently one of the most efficient denitration technologies to reduce nitrogen oxide (NOx) emissions of diesel engines. AdBlue (urea water solution. UWS) is the copyright of the reducing agent of SCR. and the spray process of UWS is one of the critical factors affecting denitration efficiency. https://www.parisnaturalfoodes.shop/product-category/bovine-gelatin-powder/