Car Exhaust Pollution Control LEAN BURN ENGINES AND THE CONTINUING REQUIREMENT FOR PLATINUM - CONTAINING AUTOCATALY STS
نویسندگان
چکیده
Over the past twenty years catalysts containing platinum group metals have become the preferred means of limiting the polluting emissions of carbon monoxide, hydrocarbons and nitrogen oxides from motor vehicles. However, from time to time methods of exhaust control are proposed which appear to off.. a viable alternative to autocatalysts. Europe has been slow to adopt emission control standards for vehicles which is, perhaps, surprising bearing in mind that European catalyst manufacturers have been producing autocatalysts and European car producers have been fitting them to vehicles destined for the U.S. and Japanese markets for over fourteen years. This article gives the background to the suggested alternatives, which are in the main different approaches to lean burn operation, and to other engine based controls. It explains why, for the foreseeable future, a platinum-containing autocatalyst will still be required to ensure that the cleanest possible exhaust is emitted under all driving conditions.
منابع مشابه
Modeling and Simulation of NOx Abatement with Storage/Reduction Catalysts for Lean Burn and Diesel Engines
The removal of nitrogen oxides emitted by diesel and lean burn engines is one of the most important targets in catalytic exhaust aftertreatment research. Besides the selective catalytic reduction (SCR) reaction with ammonia the most promising approach is the NOx Storage and Reduction Catalyst (NSR) which utilizes the nitrogen oxides storage on barium sites to form nitrates during the lean phase...
متن کاملProject Title : Analysis of a Novel Platinum Free Catalyst for Use in a Simulated Lean NO x Trap
Strict environmental regulations on air quality coupled with a consumer desire for more efficient engines has forced the automotive industry to start developing more advanced emissions aftertreatment technologies. Of the common diesel exhaust treatment methods for NOx removal, Lean NOx Traps (LNT) have been recognized as the most practical for use in small displacement engines. The current stat...
متن کاملساخت و بررسی عمل کرد سنسور اکسیژن و بهبود آن با استفاده از نیمه هادی اکسید فلزات تیتانیوم و سزیم و قلع به عنوان مرجعهای جامد
We report the development of different types of oxygen sensors based on yittria-stabilized zirconia (YSZ) as a solid electrolyte. The conventional oxygen sensor is a concentration cell with two porous Pt electrodes, one of which is exposed to air as a constant (reference) oxygen concentration and the other is exposed to automobile exhaust gas of variable oxygen concentration, depending on the a...
متن کاملin situ IR Spectroscopic Investigation of Noble Metal Catalysts Related to the Reduction of Automotive Exhaust Emissions
The reduction of automotive exhaust emissions has been one of the hottest topics in catalysis community since 1970s. Thanks to the development of three-way catalysts, main auto-exhaust pollutants, such as carbon monoxide, nitrogen oxides and unburned hydrocarbons, can be removed simultaneously. Nowadays, diesel engines and lean-burn engines become more and more popular due to their high fuel-ef...
متن کاملIn situ FTIR and TPD studies on the interaction of NOx with CeO2
Introduction Current and upcoming environmental policy in the developed countries is imposing significant decreases in NOX emissions from combustion processes such as vehicle engines. Traditional three-way catalysts are ineffective under O2 rich atmosphere lean-burn engines operate under. Lean NOx trap (LNT) technology developed for treating lean automotive exhaust emission is considered one of...
متن کامل