整体
柴油
柴油机排气
催化作用
选择性催化还原
柴油机
废气再循环
废气
柴油废气油液
柴油颗粒过滤器
限制
化学
选择性
材料科学
汽车工程
化学工程
环境科学
废物管理
有机化学
工程类
机械工程
作者
Enno Eßer,Kim Müller,Sven Kureti
标识
DOI:10.1007/s11244-022-01719-x
摘要
Abstract For NO x removal from diesel exhaust, the selective catalytic reduction (SCR) is the most common abatement technology. However, low engine load scenarios such as city driving and cold start phases demand efficient NO x reduction clearly below 200 °C, which is difficult to achieve with SCR. Hence, this work investigates the potential of the low-temperature NO x reduction with H 2 in diesel exhaust. A monolithic Pt/WO x /ZrO 2 catalyst, recently reported as highly active, was evaluated in synthetic and real diesel exhaust. The monolith demonstrated high deNO x activity between 130 and 215 °C in the synthetic exhaust including peak conversion of 90% with N 2 selectivity up to 85%. CO/HC components were shown to inhibit the H 2 -deNO x conversion thus requiring a pre-oxidation catalyst in practice. Furthermore, studies performed in an optical reactor indicated strong heat evolution along the monolith. As a result, the reaction kinetics was accelerated with an enhanced consumption of H 2 limiting the H 2 -deNO x efficiency above 200 °C. Stationary tests in diesel engine exhaust substantiated the low-temperature H 2 -deNO x performance of the monolith including NO x conversions up to 80% at temperatures as low as 135 °C.
科研通智能强力驱动
Strongly Powered by AbleSci AI