Formaldehyde Purification of Methanol Engine Exhaust Gas Using Automotive Oxidation Catalyst

Abstract

Experimental and analytical investigations on the catalytic oxidation of formaldehyde were carried out. Experiments were conducted in the catalytic reactor by changing parameters such as the concentration of coexisting NO, the type of noble metal and the amount of loaded noble metal. The experimental results showed that the presence of NO in the reaction gas affects the formaldehyde oxidation characterisics and the phenomenon of physical adsorption strongly appears in the low-temperature region. By consideration of this physical adsorption, formaldehyde removal rates in a catalytic reactor were predicted. The evaluation indicated that a satisfactory agreement between the predicted and experimental data is obtained when physical adsorption is considered.