Passive Nitrogen Oxides Removal from a Diesel-engine Exhaust Gas Using a Biomass-carbon Catalyst

Tan, Melvina and Ibrahim, Bin Yakub and Taufiq-Yap, Yun Hin (2020) Passive Nitrogen Oxides Removal from a Diesel-engine Exhaust Gas Using a Biomass-carbon Catalyst. Journal of Applied Science and Process Engineering, 7 (1). pp. 479-488. ISSN 2289-7771

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Abstract

Nitrogen oxides (NOx) removal from a diesel-engine exhaust gas requires the utilization of ammonia/urea as a reducing agent (SCR) which arose environmental concerns over the use of this chemical. Therefore, this study explored the potential of using a sustainable NOx removal system by replacing ammonia with intrinsic reductants present in the exhaust gas, such as hydrocarbons and carbon monoxide, and by application of cost-effective carbon-supported transitional metals catalyst. Copper-cerium catalyst supported over palm kernel shell activated carbon (Cu-Ce/PKS) was synthesized via deposition-precipitation method. The characterization shows that the catalyst has a considerably high surface area (though lower than the support). The high NOx removal by Cu-Ce/PKS in a passive catalytic reaction is attributable to the surface area provided by the carbon support, the low copper reducibility which leads to the low optimum operating temperature, and the synergistic effect between Cu and Ce which resulted in the wide temperature window at low-temperature range. It is concluded that Cu-Ce supported over palm kernel shell activated carbon can be further developed to reduce NOx in a passive catalytic removal for a sustainable and cost-effective SCR system.

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