Loading patent…
AssigneeRhodia Chimie
InventorsPhilippe Barthe, Catherine Hedouin, Thierry Seguelong
Estimating the term…
The invention relates to a process for the treatment of gases with high oxygen content, with a view to controlling nitrogen oxide emissions, characterized in that use is made of a catalytic composition comprising manganese oxide and at least one oxide chosen from cerium oxide and zirconium oxide. This composition may furthermore comprise at least one other element chosen from those in groups VIII, IB, IVB and VB. The process of the invention applies in particular to the treatment of exhaust gases of internal-combustion engines, more particularly diesel engines or lean-burn engines.
A process for the treatment of a gas in order to control nitrogen oxide emissions, comprising the step of treating said gas, said gas having an oxygen content of at least 5% by volume and continuously presenting an excess of oxygen relative to the stoichiometric value λ=1, with a catalytic composition consisting essentially of manganese oxide deposited on a support made of cerium oxide, zirconium oxide, or a mixture of cerium oxide and zirconium oxide.
Dependencies are inferred from the claim text.