Biofuel Impact on Diesel Engine After-Treatment: Deactivation Mechanisms and Soot Reactivity

摘要

Abstract Since 2014 (Euro VI), heavy goods vehicles must be equipped with a complex exhaust gas post-treatment system including a diesel oxidation catalyst (DOC), a catalyst for the selective reduction of NO~(x)(SCR), and a diesel particulate filter (DPF), with a required durability of 7?years or 700,000?km. Consequently, when biodiesel is used, especially pure biodiesel (B100), catalysts will be subjected over 700,000?km to kilogrammes of inorganic elements (Na, K, and P), even if they are limited to a few ppm in biodiesel fuel. The durability of the catalytic exhaust system is therefore questionable. This issue is of major concern to vehicle manufacturers. This study aims to make a detailed investigation of the impact of biodiesel use on the durability of the existing Euro VI catalytic systems, with a special focus on deactivation through poisoning for DOC and SCR catalysts, and on the physics and chemistry of particles and their reactivity.