Methods Used in Decreasing the Emissions of NOx Associated with the Use of Biodiesel

Abstract

Greater use of biodiesel is inhibited in part because of the observed increase in NOx emissions as compared to conventional petroleum diesel fuel. Research in the field of NOx abatement has grown significantly in the past two decades. The general trend has been to develop new catalysts with complex materials in order to meet the stringent environmental regulations. This review discusses briefly about the different sources of NOx and its adverse effect on the ecosystem. The main focus is on the progress and development of various methods used for this purpose .They are addition of catalysts for NOx removal from exhaust (by NO decomposition, NO reduction by carbon mono-oxide or hydrogen or ammonia or hydrocarbons), NOx Storage and Reduction (NSR) , Selective NOx Recirculation (SNR) , Ozone injection , addition of antioxidant (like 2-ethylhexyl nitrate, 2,2’-methylenebis(6-tert-butyl-4-methylphenol) , TBHQ , Propyl gallate , Diphenylamine , BHA etc) ,blending of the biodiesel fuel with short-chained, saturated methyl ester and hydrogenation of soybean oil prior to transesterification by mixing 60% capylic/40% capric blend with B100.