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Honeycomb-type denitration catalyst with hierarchical pore structure and preparation method for honeycomb-type denitration catalyst

A denitration catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., to achieve the effects of less dosage, less active ingredient content, and increased porosity and pore volume

Active Publication Date: 2014-05-07
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Honeycomb-type denitration catalyst with hierarchical pore structure and preparation method for honeycomb-type denitration catalyst
  • Honeycomb-type denitration catalyst with hierarchical pore structure and preparation method for honeycomb-type denitration catalyst
  • Honeycomb-type denitration catalyst with hierarchical pore structure and preparation method for honeycomb-type denitration catalyst

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preparation example Construction

[0051] The preparation of catalyst carrier is not the innovative point of the present invention, and those skilled in the art can buy required carrier on the market, and the present invention mainly uses V 2 o 5 -WO 3 / TiO 2 Catalyst is taken as an example to illustrate the preparation process of the present invention.

[0052] In the following examples, used PMMA microspheres, PS microspheres and polyethylene oxide are commercially available products, and the ball diameters of PMMA microspheres and PS microspheres are in the range of 30-200 mm, and the molecular weight of polyethylene oxide is at 1 × 10 5 -1×10 6 scope.

[0053] The catalysts obtained in the examples were subjected to mechanical strength tests, porosity, pore size distribution and pore volume tests, and SEM characterization and denitrification experiments were performed on the catalysts.

[0054] The mechanical strength test was carried out on an Instron-5569 electronic universal testing machine with a t...

Embodiment 1

[0063] One mixing: add 16.67 g titanium tungsten powder, 3.33 g titanium tungsten silicon powder, 1.4 g (according to 7 wt.% of the total amount of titanium tungsten powder and titanium tungsten silicon powder, that is catalyst carrier WO 3 / TiO 2 -SiO 2 Add 7wt% of the mass of the mass, the same below) chopped glass fiber, 0.6 g (according to 3 wt.% of the total amount of titanium tungsten powder and titanium tungsten silicon powder, that is, the catalyst carrier WO 3 / TiO 2 -SiO 2 Add 3wt% of the mass of the mass, the same below) methyl cellulose is added into the mixer, the mixing time is 2-3 h, and the mixing is completed.

[0064] Secondary mixing: take out the material mixed in the first time, add 1.0 g lactic acid (according to 5 wt.% of the total amount of titanium tungsten powder and titanium tungsten silicon powder, that is, the catalyst carrier WO 3 / TiO 2 -SiO 2 Add 5wt% of the mass of the mass, the same below), 1.0 g (according to 5 wt.% of the total amount ...

Embodiment 2

[0071]The catalyst was prepared by the same method as in Example 1, except that the following method was used for one mixing: 16.67 g titanium tungsten powder, 3.33 g titanium tungsten silicon powder, 1.4 g (7 wt.%) chopped glass fiber, 0.6 g (3 wt.%) methylcellulose, 1.0 g (according to 5 wt.% of the total amount of titanium tungsten powder and titanium tungsten silicon powder added, that is, the catalyst carrier WO 3 / TiO 2 -SiO 2 Add 5wt% of the mass of the mass, the same below) Polyethylene oxide is added into the mixer, the mixing time is 2-3 h, and the mixing is completed.

[0072] The resulting product has moderate viscosity, is easy to extrude, and has a smooth surface without cracking.

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Abstract

The invention discloses a honeycomb-type denitration catalyst with a hierarchical pore structure and a preparation method for the honeycomb-type denitration catalyst. The catalyst has a honeycomb-type structure; micron- and nano-size blind holes are formed in the wall surface of the catalyst; the diameter of each micron-size blind hole is 0.1-1 micron; the diameter of each nano-size blind hole is 10-100 nanometers. The technological process is simple; PMMA (polymethyl methacrylate)(PS (Poly Styrene)) microspheres and polyoxyethylene are added, and other additives and technical conditions are adjusted, so that the high-porosity honeycomb-type denitration catalyst with the hierarchical pore structure is obtained. The catalyst can generate multiple active centers, is high in adsorption and mass transfer capacity and has the advantages that the using amount of the catalyst within the same unit volume is small and the like; therefore, the catalysis performance of the catalyst is guaranteed, and the using amount of catalyst raw materials and the weight of a finished product within the unit volume are reduced.

Description

technical field [0001] The present invention relates to a kind of ammonia (NH 3 ) Selective Catalytic Reduction (SCR) denitration catalyst and a preparation method thereof, in particular to a high-porosity honeycomb denitration catalyst with a micro-nano hierarchical porous structure and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is the main pollutant that causes acid rain and photochemical smog, and its emissions mainly come from stationary sources such as coal-fired boilers, industrial furnaces and mobile sources such as motor vehicle exhaust. My country is getting on SO 2 After the phased results of the control, it was proposed that during the "Twelfth Five-Year Plan" x Requirements for realizing total emission control, that is, NO in 2015 x The total emissions decreased by 10% compared with 2010. In addition, the "Emission Standard of Air Pollutants for Thermal Power Plants" was implemented in 2012, which requires NO x (with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/10B01J35/04B01J23/30B01J23/28B01D53/90B01D53/56
Inventor 张昭良谷华春辛颖李倩
Owner UNIV OF JINAN
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