Investigation of NH3 emissions from new technology vehicles as a function of vehicle operating conditions
Investigation of NH3 emissions from new technology vehicles as a function of vehicle operating conditions
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DOI：
10.1021/es030403
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发表时间：
2003-11-01
影响因子：
11.4
通讯作者：
Norbeck, JM
中科院分区：
文献类型：
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作者：
Huai, T;Durbin, TD;Norbeck, JM
本研究的目的是测量氨（NH3）的排放量从现代技术车辆，因为信息是稀缺的颗粒物（PM）前体的这一重要来源。测试变量包括车辆认证的排放水平、车辆运行条件和催化剂使用寿命。八辆具有低排放车辆（LEV）至超超低排放车辆（SULEV）认证水平的车辆使用收到的和台架老化的催化剂，通过联邦测试程序（FTP 75）、US 06循环、热运行505、纽约市循环（NYCC）和专门设计的模态排放循环（MEC 01 v7）进行了测试。通过可调谐二极管激光（TDL）吸收光谱法测量了原始排气中的NH3排放。结果表明，NH3排放取决于驾驶模式，主要是在加速事件中产生的。更具体地，对于高车辆比功率（VSP）事件和富燃运行条件，发现高NH3排放。对于某些车辆，在冷启动期间催化剂起燃后立即形成NH3排放。
The objective of this study was to measure ammonia (NH3) emissions from modern technology vehicles since information is scarce about this important source of particulate matter (PM) precursors. Test variables included the emission level to which the vehicle was certified the vehicle operating conditions, and catalyst age. Eight vehicles with low-emission vehicle (LEV) to super-ultralow-emission vehicle (SULEV) certification levels were tested over the Federal Test Procedure (FTP75), a US06 cycle, a hot running 505, a New York City Cycle (NYCC), and a specially designed Modal Emissions Cycle (MEC01v7) using both as-received and bench-aged catalysts. NH3 emissions in the raw exhaust were measured by tunable diode laser (TDL) absorption spectroscopy. The results show that NH3 emissions depend on driving mode and are primarily generated during acceleration events. More specifically, high NH3 emissions were found for high vehicle specific power (VSP) events and rich operating conditions. For some vehicles, NH3 emissions formed immediately after catalyst light-off during a cold start.