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

A series of hierarchical three-dimensionally ordered macroporous Fe_10-xV_x binary metal oxides (3DOM-Fe_10-xV_x) catalysts were designed and synthesized for selective catalytic reduction of NO_x from marine diesel engine exhaust. The physical-chemical performance of the 3DOM-Fe_10-xV_x catalysts were subjected by various techniques and found that the 3DOM-Fe_10-xV_x 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 Fe_9.0V_1.0 catalyst due to its special 3DOM structure. Even when simultaneously exposed to the soot and high concentration of sulfur dioxide reaction feeds, the 3DOM-Fe_9.0V_1.0 catalyst also displayed superior catalytic activity. Interestingly, we found that the soot had a reduction activity for NO_x at high reaction temperature, which can effectively extend its active temperature window. The 3DOM-Fe_10-xV_x 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.