Christensen A, Westerholm R, Almén J
Department of Analytical Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden.
Environ Sci Technol. 2001 Jun 1;35(11):2166-70. doi: 10.1021/es0002565.
Relatively few emission characterization studies have been made on small engines used in garden equipment. The present investigation focuses on exhaust characterization from a lawn mower engine fueled with two different fuels in combination with and without an oxidizing catalyst. The compounds measured in the exhaust are carbon monoxide, hydrocarbons, nitrogen oxides, particulates, polycyclic aromatic hydrocarbons, methane, ethane, ethene, ethanol, and nitrous oxide. A significant reduction can be achieved by the use of a catalyst. By selection of the fuel, a significant reduction of certain carcinogenic compounds ("probably carcinogenic to humans" according to the IARC; benzo[a]pyrene and benzo[a]anthracene) may be achieved. The highest reduction improvement is achieved through the combination of an environmentally improved fuel, i.e., alkylate fuel, and a catalyst system. The data presented show that emissions from lawn mower engines are still relatively large although there is the potential for further improvements.
针对园林设备中使用的小型发动机开展的排放特性研究相对较少。本研究聚焦于一台草坪割草机发动机的尾气特性，该发动机使用两种不同燃料，分别有无氧化催化剂的情况。尾气中测量的化合物包括一氧化碳、碳氢化合物、氮氧化物、颗粒物、多环芳烃、甲烷、乙烷、乙烯、乙醇和一氧化二氮。使用催化剂可实现显著减排。通过选择燃料，可显著减少某些致癌化合物（根据国际癌症研究机构的定义，“可能对人类致癌”；苯并[a]芘和苯并[a]蒽）。通过结合环境友好型燃料（即烷基化燃料）和催化系统，可实现最高的减排效果。所呈现的数据表明，尽管草坪割草机发动机的排放仍有进一步改善的潜力，但目前排放量仍然相对较大。
