Home – Home – Jornals – Chemistry for Sustainable Development 2005 number 6

Formulations of original catalytic compositions have been developed to clear gas emissions of highway transport on the basis of catalysts that are free of precious metals: NTK-10-1, STK, and Ni-Cr oxidic catalyst, the use of which was not made in these processes previously. High activity of the developed catalytic compositions is caused by the effect of synergism that has been discovered and studied for the first time with mechanical mixtures of commercial catalysts. The investigation of the mechanism of the reaction of selective NO_x reduction by propane over individual industrial catalysts has demonstrated that the effect of synergism that can be observed with their binary mechanical mixtures is caused by oxidizing activation of propane that proceeds on the surface of STK and Ni-Cr oxidic catalysts with the formation of more efficient reducing agents, namely, propylene and hydrogen respectively. Owing to the interphase diffusion, the last-mentioned fall on the surface of the NTK-10-1 catalyst through the gas phase, and the catalyst activates NO_x.