Hydrotreated vegetable oil (HVO), a glycerol-derived biofuel (blended with diesel fuel at 20% v/v, Mo·bio®) and biodiesel produced through the esterification of residual free fatty acids from the palm oil industry (pure and blended with diesel fuel at 20% v/v), all of them considered as advanced biofuels as defined in the Directive EU/2018/2001, were tested in a Euro 6 diesel vehicle equipped with ammonia-SCR. Tests were carried out in a chassis dyno at warm (24°C) and cold (−7°C) ambient conditions following the Worldwide harmonized Light-duty vehicles Test Cycle (WLTC). The efficiency of the SCR when changing the fuel was also analysed. Regarding vehicle performance, fuel properties were mainly relevant at warm conditions. Because of the lower EGR rate, NO_x emissions upstream of the SCR were higher at cold temperature, mainly during the low and the extra-high speed phases of the WLTC. CO and THC emissions were only important at the beginning of the cycle and at −7°C. HVO presented advantages regarding these compounds, while the worse cloud point of biodiesel led to higher emissions. As expected, engine-out NO_x emissions were very sensitive to the EGR rate, HVO showing a slightly better behaviour because of its high cetane number. The SCR efficiency was mainly affected by the exhaust gas temperature, although fuel-derived effects were also significant. In fact, a more appropriate NO₂/NO_x ratio at the catalyst inlet for HVO and a higher hydrocarbon concentration at the low-speed phase for B20 contributed to a lower tail-pipe NO_x emissions at −7°C. The oxygen content of biodiesel-based fuels (B100 and B20) led to lower particle number with respect to diesel fuel. Despite its nil aromatic content, the higher EGR rate and the extremely superior autoignition trend of HVO led to higher particle number under high engine load and warm conditions.

加氢处理的植物油（HVO），甘油衍生的生物燃料（与20％v / v的柴油燃料混合，Mo·bio®）和通过棕榈油工业中残留的游离脂肪酸的酯化而生产的生物柴油（纯净并与之混合） （按20％v / v）的标准柴油燃料）（均已被欧盟指令EU / 2018/2001定义为高级生物燃料）在装有氨气SCR的欧6柴油汽车中进行了测试。按照全球协调的轻型车辆测试周期（WLTC），在底盘测功机在温暖（24°C）和寒冷（-7°C）的环境条件下进行测试。还分析了更换燃料时SCR的效率。关于车辆性能，燃油特性主要与温暖的条件有关。由于较低的EGR率，NO _xSCR上游的废气排放在低温下较高，主要是在WLTC的低速和超高速阶段。CO和THC排放仅在循环开始时以及在-7°C时才重要。HVO在这些化合物方面表现出优势，而生物柴油浊点更差导致排放量增加。正如预期的那样，发动机排出的NO _X排放量的EGR率非常敏感，HVO显示，因为其高十六烷值稍好的行为。SCR效率主要受废气温度影响，尽管燃料产生的影响也很显着。实际上，更合适的NO ₂ / NO _x比在用于HVO催化剂入口和在B20为低速的阶段具有更高浓度烃促成较低的尾管NO _X排放物在-7℃。基于生物柴油的燃料（B100和B20）的含氧量导致其相对于柴油燃料而言具有更低的颗粒数。尽管芳烃含量为零，但较高的EGR率和极高的HVO自燃趋势导致在高发动机负载和温暖条件下具有较高的颗粒数。