Neutralization of non-normative toxic diesel exhaust components
Abstract
Introduction. Polycyclic aromatic hydrocarbons (PAHs), including benz-α-pyrene (BaP) and aldehydes (RCHO), are highlighted in the list of substances contained in the diesel engines exhaust gas. The specific toxicity of these compounds exceeds the toxicity of CO, HC, NOx emissions by several orders of magnitude, as well as of dispersed particles normalized by modern environmental standards. Because of the analysis complexity the methods of eliminating the real toxicological BaP and RCHO hazards remain poorly understood.
The purpose of the study was to develop a method of BaP and RCHO analysis in diesel exhaust gas. Methodology and research methods. The article presents the results of the analytical means development to estimate BaP and RCHO emissions in some domestic diesel engines exhaust gases. To determine PAHs in diesel engines exhaust gas by the Shpolsky method the operation of sample preparation was improved and an original methodology of separate and total control using 2,4-dinitrophenylhydrazine was proposed to analyze RCHO.
Scientific novelty and results. To determine separate and integral (UN Regulation No. 49) emissions of BaP and RCHO from the exhaust gas of the D-120, MMZ-245.9 and YaMZ-236A diesel engines that are widespread in the Russian Federation the above analytical methods were used. Studies have shown that the toxicological effect of BaP and RCHO emissions is comparable to NOx emissions, and therefore, their neutralization is necessary. The technology of catalytic oxidation of BaP and RCHO on alumina-platinum and alumina-palladium metal-block catalysts was proposed to solve this problem.
Practical significance. The complex of studies showed that being processed by such catalysts, the integral emission of BaP and aldehydes in exhaust gas decreased by more than 80%. The results of the work were confirmed by the catalytic neutralization of diesel exhaust gases converted to work on dimethylether.
About the Author
V. I. PanchishnyiRussian Federation
PhD (Eng), leading expert of Expert Council
Moscow 125438
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Review
For citations:
Panchishnyi V.I. Neutralization of non-normative toxic diesel exhaust components. Trudy NAMI. 2020;(2):44-54. (In Russ.)