The invention provides a lithium-manganese-based composite oxide containing Ti and Ni, which is represented by the compositional formula: Li.sub.1+x(Mn.sub.1-n-mNi.sub.mTi.sub.n).sub.1-xO.sub.2, wherein 0

 
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> Composition, catalytic module element, and catalytic module for selective catalytic reduction of nitrogen oxides in gaseous medium containing oxygen

> Catalyzed diesel soot filter and process
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