Alumina-supported In2O3, Ga2O3 and B2O3 catalysts for lean NOx reduction with dimethyl ether

Alumina-supported In2O3, Ga2O3 and B2O3 were investigated as catalysts for lean NOx reduction with DME as reducing agent and compared to pure Al2O3 and In2O3. The In2O3-promoted alumina catalysts showed the highest NOx conversion at low temperatures, although with a narrow temperature window. Pure In2O3, on the other hand, was inactive for NOx reduction with DME. The Ga2O3- and B2O3-promoted alumina catalysts gave the highest NOx conversion at higher temperatures, showed a temperature window similar to pure alumina, but were less sensitive to H2O inhibition. Possible reasons for these observations are discussed.

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► γ-Alumina-based catalysts were studied for lean NOx reduction with dimethyl ether.
► In2O3/Al2O3, Ga2O3/Al2O3 and B2O3/Al2O3 gave higher NOx conversion than pure Al2O3.
► In2O3/Al2O3 catalysts showed the highest NOx conversion at low temperature.
► Pure In2O3 was inactive for NOx reduction with dimethyl ether.
► Ga2O3/Al2O3 and B2O3/Al2O3 gave the highest NOx conversion at high temperature.