tailieunhanh - INTERFACIAL APPLICATIONS IN ENVIRONMENTAL ENGINEERING - CHAPTER 15

Sử dụng một chất xúc tác Pt và Rh Aerosol đốt được cải thiện và giảm phát thải Hôm nay chúng ta nhiều hơn nữa ý thức về bảo vệ hành tinh của chúng ta hơn so với cách đây khoảng 20 năm. Vào thời điểm đó, sự nóng lên toàn cầu, hiệu ứng nhà kính, lỗ ozone, và đáng lo ngại về ô nhiễm và khí thải đã bắt đầu được sự quan tâm của các nhà khoa học, cụm từ như lo lắng của công chúng, mặc dù các chủ đề thường không đúng cách hiểu và các phương. | 15 Use of a Pt and Rh Aerosol Catalyst for Improved Combustion and Reduced Emissions TREVOR R. GRIFFITHS The University of Leeds Leeds United Kingdom I. INTRODUCTION Today we are much more conscious about preserving our planet than some 20 years ago. At that time global warming the greenhouse effect the ozone hole and worrying about pollution and emissions were beginning to be the concerns of scientists now such phrases worry the general public even though the topics are not often properly understood and the media usually exaggerate scientific concerns and hence public worry can be out of proportion. That being said scientists are not always right and being human can miss an advance or development or not recognize its worth until years later. How that can be is more for the historians of science and the psychologists. This is the story of an invention for reducing the emissions of automotive and diesel engines that was initially neglected because it was born before its time and now may well be the simple but significant and economic means for reducing emissions to levels that governments are wanting to achieve. Searles and Bertelsen 1 reviewed the existing and emerging technologies that will be available to meet the exhaust emission regulations for diesel-powered trucks and other commercial vehicles or heavy-duty vehicles adopted or being considered by the European Union EU and the United States for implementation during the 21st century. These technologies include diesel oxidation catalysts DeNOx 2 catalysts and nitrogen oxide NOx adsorbers selective catalytic reduction SCR and diesel particulate filters DPFs as well as filter technology for particulate matter crankcase emission control. They noted that exhaust emission control technology in the form of the catalytic converter or auto-catalyst was first introduced in the United States in 1974 D E X K B R Copyright n 2003 by Marcel Dekker Inc. All Rights Reserved. in passenger cars and appeared on European roads in