Investigation the Activity of Pd Loading on Commercial Monolithic Catalyst in Automobile Exhaust Gases


Catalytic monolith reactors have numerous applications in industrial processes and as technical devices, so the focus is set specially on automotive catalytic converters. The present work aimed to study the experimental performance of monolith reactor on the oxidation and reduction of exhaust gas (NO, CO, and HC) which emitted from gasoline generator. Commercial and modified commercial ceramic monolith catalyst was used in the present work. The modified commercial catalyst was obtained by loaded Pd metal .A laboratory unit was constructed for this purpose where a versatile stainless steel monolith reactor of 0.02 m inside diameter and 0.2 m height was used.The catalytic performance of the catalysts was studied in the following operating conditions, in a border range of gas space velocity(17.69 – 44.23s-1), reaction temperature(373 – 673 K), bed length(0.075 – 0.15 m) and at atmospheric pressure and constant air/fuel ratio (14.6).The results show that the conversion of NO, CO and HC are slightly changed with the bed length . The conversion of exhaust gas reactant enhances in presence of water, increases with the increasing reaction temperature and decreases with increasing gas space velocity. Monolithic catalyst which loaded with 0.4% Pd gives high conversion compared with an commercial catalyst (unloaded) for the HC oxidation reaction more than CO oxidation and NO reduction.