doiSerbia

Adsorption as alternative process in the preliminary production of automotive additive

Baia Luana Ventura (Instituto de Química, Programa de Pós-graduação em Engenharia Química, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brasil)
Raddi de Araujo Lucia R. (Instituto de Química, Programa de Pós-graduação em Engenharia Química, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brasil)
Pereira Carlos Guerra (Instituto de Química, Laboratório de Engenharia e Tecnologia de Petróleo e Petroquímica, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brasil)
Carvalho de Souza Wallace (Instituto de Química, Laboratório de Engenharia e Tecnologia de Petróleo e Petroquímica, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brasil)
Gaya de Figueiredo Marco Antonio (Instituto de Química, Programa de Pós-graduação em Engenharia Química, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brasil)

Nitrogenous contaminants in the diesel fraction are converted to NOx compounds in an automotive combustion chamber. Afterwards, they are reduced to nitrogen by catalytic reduction/oxidation reactions in presence of ammonia derived from a 32.5 wt.% urea solution. This process is named selective catalytic reduction (SCR). In Brazil, the urea solution for SCR is ARLA 32 and must comply with the limit content of 0.3 wt.% of biuret. However, the commercial Brazilian urea solution has an average biuret content of 0.5 wt.%. Thus, it is necessary to adjust the biuret content in urea solution to be used as ARLA 32, and adsorption is a low energy option. The objective of this study was to evaluate commercial adsorbents for removing biuret from solution of commercial urea to adjust it to the specification of ARLA 32. Two activated coals and one ion exchange resin were tested in adsorption assays, with best performances of both coals.

Keywords: adsorption, biuret, characterization, coal