Catalyst with regular structure and preparation method thereof and method for simultaneously reducing both sox and nox from flue gas

A method for preparing a catalyst with regular structure capable of simultaneously reducing the emission of SOx and NOx, which method comprises the steps of:

• (1) formulating a solution containing a precursor of metal component(s) selected from Group rare earth and/or Group IIA and a precursor of non-precious metal component(s) selected from Groups VB, VIIB, VIII, IB, and IIB;
• (2) carrying out a coprecipitation reaction between the solution obtained in step (1) and a coprecipitant, and then drying and calcining the obtained solid product to obtain an active metal component precursor;
• (3) mixing and slurrifying the active metal component precursor, a matrix source and water to produce an active component coating slurry;
• (4) coating the support with regular structure with the active component coating slurry and drying and calcining to produce a partial-active component coating distributed on the inner surface and/or the outer surface of the support with regular structure, i.e. to obtain a semi-finished catalyst product;
• (5) impregnating the semi-finished catalyst product obtained in step (4) with a solution containing a precursor of precious metal component, then drying and/or calcining to produce an active component coating distributed on the inner surface and/or the outer surface of the support with regular structure;
• wherein the precursor of metal component(s) selected from Group rare earth and/or Group IIA, the precursor of non-precious metal component(s) selected from Groups VB, VIIB, VIII, IB, and IIB, the matrix source, the precursor of precious metal component, and the support with regular structure are used in such amounts that in the prepared catalyst with regular structure, based on the total weight of the catalyst, the content of the active component coating is 1-50 wt %, the active component coating contains a matrix and an active metal component, wherein, based on the total weight of the active component coating, the content of the matrix is 10-90 wt %, the content of the active metal component is 10-90 wt %, the active metal component contains:
• 1) as oxide, 50-95 wt % of metal component(s) selected from Group rare earth and/or Group IIA;
• 2) as oxide, 5-50 wt % of non-precious metal component(s) selected from Groups VB, VIIB, VIII, IB, and IIB;
• 3) as element, 0.01-2 wt % of precious metal component;
• or
• wherein the precursor of metal component(s) selected from Group rare earth and/or Group IIA, the precursor of non-precious metal component(s) selected from Groups VB, VIIB, VIII, IB, and IIB, the matrix source, the precursor of precious metal component, and the support with regular structure are used in such amounts that in the prepared catalyst with regular structure, based on the total weight of the catalyst, the content of the active component coating is 5-40 wt %, the active component coating contains a matrix and an active metal component, wherein, based on the total weight of the active component coating, the content of the matrix is 40-90 wt %, the content of the active metal component is 10-60 wt %, the active metal component contains:
• 1) as oxide, 60-90 wt % of metal component(s) selected from Group rare earth and/or Group IIA;
• 2) as oxide, 10-40 wt % of non-precious metal component(s) selected from Groups VB, VIIB, VIII, IB, and IIB;
• 3) as element, 0.02-1.5 wt % of precious metal component;
• or
• wherein the precursor of metal component(s) selected from Group rare earth and/or Group IIA, the precursor of non-precious metal component(s) selected from Groups VB, VIIB, VIII, IB, and IIB, the matrix source, the precursor of precious metal component, and the support with regular structure are used in such amounts that in the prepared catalyst with regular structure, based on the total weight of the catalyst, the content of the active component coating is 10-35 wt %, the active component coating contains a matrix and an active metal component, wherein, based on the total weight of the active component coating, the content of the matrix is 50-80 wt %, the content of the active metal component is 20-50 wt %, the active metal component contains:
• 1) as oxide, 65-85 wt % of metal component(s) selected from Group rare earth and/or Group IIA;
• 2) as oxide, 15-35 wt % of non-precious metal component(s) selected from Groups VB, VIIB, VIII, IB, and IIB;
• 3) as element, 0.03-1.2 wt % of precious metal component.