Hierarchical three-dimensionally ordered macroporous Fe-V binary metal oxide catalyst for low temperature selective catalytic reduction of NOx from marine diesel engine exhaust

A series of hierarchical three-dimensionally ordered macroporous Fe(10-x)V(x )binary metal oxides (3DOM-Fe10-xVx) catalysts were designed and synthesized for selective catalytic reduction of NOx from marine diesel engine exhaust. The physical-chemical performance of the 3DOM.Fe(10-x)V(x )catalysts were subjected by various techniques and found that the 3DOM-Fe10-xVx with the Fe to V atomic ratio of 9.0/1.0 exhibited a wider active temperature window, better soot resistance performance compared with the conventional Fe9.0V1.0 catalyst due to its special 3DOM structure. Even when simultaneously exposed to the soot and high concentration of sulfur dioxide reaction feeds, the 3DOM-Fe9.01V1.0 catalyst also displayed superior catalytic activity. Interestingly, we found that the soot had a reduction activity for NOx at high reaction temperature, which can effectively extend its active temperature window. The 3DOM-Fe10-xVx catalysts prepared in this work could be potentially a good candidate for the cargo ships deNO(x) catalysts to satisfy the more stringent exhaust emission rules.