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The invention provides a regeneration liquid of an inactive SCR (Selective Catalytic Reduction) denitration catalyst. The regeneration liquid comprises a washing liquid, a pore diameter restoration liquid and an active component replenishing liquid, wherein the washing liquid comprises vitriol and lauryl sodium sulfate; the pore diameter restoration liquid comprises a pore diameter restoration agent and a dispersant; the pore diameter restoration agent comprises arbitrary one or multiple components in ethyl alcohol, urea, ammonium carbonate and ammonium bicarbonate; the dispersant is polyethylene glycol; the active component replenishing liquid comprises ammonium metavanadate, ammonium tungstate, a PH regulating agent and an additive; the additive comprises lauryl sodium sulfate and polyethylene glycol; the PH regulating agent is arbitrary one or more of oxalic acid and ammonium hydroxide. The regeneration liquid of the inactive SCR denitration catalyst provided by the invention is capable of simultaneously washing, recovering the pore diameter and replenishing the active components of the SCR denitration catalyst; after the catalyst is subjected to the processing of the regeneration liquid, the pore diameter structure of the catalyst is effectively improved and the catalytic activity is recovered to 90% and above of that before inactivation.

The invention discloses a reconstituted tobacco leaf and a preparation method and application thereof. The reconstituted tobacco leaf is prepared by a papermaking method; a paper base formed by using pulp is perforated and then coated with a coating solution; and in the paper base, the aperture is 0.4 to 0.8 millimeter, the hole pitch is 1.0 to 3.0 millimeters, and the hole row pitch is 1.5 to 2.0 millimeters. The structure of the paper base is optimized, and perforation design is adopted, so that the contact area of the paper base and the coating solution is increased; and the coating solution is easily penetrated into the paper base, so that the absorption performance of the paper base on the coating solution is remarkably improved, the coating rate is finally remarkably improved, full bearing of soluble components and aroma components of the reconstituted tobacco leaf is ensured, the sensory quality is greatly improved, aroma quality and impurity gas are obviously improved, and the quality of the reconstituted tobacco leaf is integrally improved.

The invention provies an exhaust gas purifying catalyst with an excellent effect of suppressing deterioration due to aggregation of a noble metal catalyst during endurance at high temperature, and a production method therefor. The method for producing the exhaust gas purifying catalyst that has a porous carrier and a noble metal catalyst supported thereon includes: preparing the porous carrier that contains alumina-ceria-zirconia composite oxide particles and has physical property values, after subjected to baking at 900DEG C. for 5 hours, of a pore diameter of the particles in the range of 2to 20 nm, a specific surface area of the particles in the range of 75 to 115 m2 / g, a crystallite size of a ceria-zirconia composite oxide contained in the particles in the range of 4 to 6 nm, and a bulk density of the particles in the range of 0.5 to 0.9 cm3 / g, and bringing a noble metal chemical solution having an aggregate of platinum or the like with a grain size adjusted to less than or equalto 1 nm with the use of a platinum nitric acid solution or the like, into contact with the porous carrier, so that the noble metal catalyst is supported on the porous carrier.