Evaluation of Commercial Adsorbents for Removal of Biuret in Urea Solution for Automotive Applications
| Periodical | Defect and Diffusion Forum (Volumes 326 - 328) |
|---|---|
| Main Theme | Diffusion in Solids and Liquids VII |
| Edited by | Andreas Öchsner, Graeme E. Murch, Ali Shokuhfar and João M.P.Q. Delgado |
| Pages | 24-28 |
| DOI | 10.4028/www.scientific.net/DDF.326-328.24 |
| Citation | G.V. Estrela et al., 2012, Defect and Diffusion Forum, 326-328, 24 |
| Online since | April, 2012 |
| Authors | G.V. Estrela, W.C. Souza, G.V. Azevedo, H.L. Corrêa, M.A.G. Figueiredo |
| Keywords | Adsorption, Biuret, Diesel, Treatment |
| Price | US$ 28,- |
Currently, one of the major technological challenges refers to issues related to the emission of gaseous pollutants, particularly those based on SOx and NOx. Generated mainly by the burning of fossil fuels, their reduction can be achieved by changes in the conditions of refining processes, capable of adapting the legal specifications of fuel sulphur and nitrogen, or by treatment of gases exhausted. If on the one hand the industries represent an essential portion of such gases, on the other hand the automotive vehicles contribute resolutely to complement another fraction of the emissions. The growing number of diesel-powered cars in Brazil, together with the existing environmental constraints in the country, requires greater control of the indices of gaseous mixtures mentioned above, which can be decreased through reducing agents based on technologies Reducing Agents Automotive Liquids (RAAL). By injection of an aqueous solution of urea on vehicular exhaust, it is possible for example, to catalytically reduce NOx compounds to a mixture of N2 and H2O. Although this project is already in development, several challenges must be overcome, such as the catalyst deactivation by biuret (present in the solution of urea), more efficient engine design and development of fuels with lower levels of nitrogen. This work aims to study the removal of biuret by commercial adsorbents, as a way to adequate the RAAL to employment systems of diesel injection.
