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Iron-based low-temperature SCR denitration catalyst and preparation method thereof

A denitration catalyst and low temperature technology, applied in the field of denitration catalysts, can solve the problems of limiting large-scale industrial application, immature preparation process, low low temperature denitration activity, etc., to reduce huge costs, widen the effective denitration temperature range, and simplify production and synthesis. The effect of craftsmanship

Inactive Publication Date: 2015-06-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, the low-temperature denitrification activity of iron-based catalysts is relatively low, and the preparation process is not mature enough, which limits its large-scale industrial application; Compared with titanium series catalysts, iron-based catalysts will undoubtedly be more suitable for the removal of nitrogen oxides emitted by coal-fired power plants in my country

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  • Iron-based low-temperature SCR denitration catalyst and preparation method thereof
  • Iron-based low-temperature SCR denitration catalyst and preparation method thereof
  • Iron-based low-temperature SCR denitration catalyst and preparation method thereof

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preparation example Construction

[0029] Compared with general catalyst preparation methods such as hydrothermal synthesis, sol-gel method, and template method, the co-precipitation method has the advantages of simple preparation process, low cost, easy synergy between active components, and easy large-scale industrial production. , so Fe-Ce / TiO in the invention 2 and Fe-Mn-Ce / TiO 2 The preparation of these two kinds of mixed catalysts adopts co-precipitation method.

[0030] Iron-based low-temperature SCR denitration catalyst Fe-Ce / TiO of the present invention 2 The preparation method is to dissolve ferric nitrate and cerium nitrate in deionized water, add titanium dioxide, stir vigorously for 1-3h to fully mix, then ultrasonically mix for 1-6h, put it in an oven at 100-110°C for 8-12h, and put it in an oven for 8-12h. Calcined in air atmosphere for 1.5-2.5h at a temperature of 500-600°C, and then ground into powder.

[0031] Iron-based low-temperature SCR denitration catalyst Fe-Mn-Ce / TiO of the present i...

Embodiment 1-9

[0034] For convenience of expression, the catalyst of embodiment 1-9 is expressed as: Fe(x)-Mn(y)-Ce(z) / TiO 2, replaced by the label "n#", x represents the molar ratio of Fe / Ti, y represents the molar ratio of Mn / Ti, z represents the molar ratio of Ce / Ti, all molar ratios are based on the carrier TiO 2 The amount used is for reference. In the present invention, x is 0.2, y is 0-0.8, and z is 0.2, as shown in the following table.

[0035]

[0036] The preparation method is specifically: the Ce(NO 3 ) 3 , Mn(NO 3 ) 3 , Fe(NO 3 ) 3 Fully dissolve in a beaker filled with 50-80mL deionized water, and add insoluble titanium dioxide TiO 2 For mixing, stir magnetically in a round bottom flask for 1-3h to make it fully mixed, the mixture is foamy, and there is a small amount of precipitation at the bottom, which should be insoluble TiO 2 . Then put the mixed solution in an ultrasonic cleaner for 4 hours of ultrasonication, so that various metal compounds can be mixed evenly...

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Abstract

The invention provides an iron-based low-temperature SCR denitration catalyst and a preparation method thereof. Iron and cerium compounds are taken as active components, or iron, manganese and cerium compounds are taken as active components, titanium oxide is taken as a carrier, the molar ratio of iron, manganese and cerium is 1:(0.5-4):(0.5-1.5), and the molar ratio of iron and titanium oxide is 0.15-0.25. The preparation method comprises the steps of dissolving iron nitrate, manganese nitrate and cerium nitrate in deionized water, adding the titanium oxide, stirring intensely so as to mix the above compounds thoroughly, then performing ultrasonic mixing, putting the mixture into an oven for drying, calcining in an air atmosphere, and then grinding the mixture into powder. The iron-based low-temperature SCR denitration catalyst provided by the invention has an obvious advantage in cost, and meanwhile, the iron-based low-temperature SCR denitration catalyst has higher denitration efficiency under a medium and low temperature.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, in particular to an iron-based low-temperature SCR denitration catalyst and its preparation. Background technique [0002] In recent years, people have researched and developed a variety of denitrification technologies for coal-fired thermal power plants around the two aspects of denitrification during combustion and flue gas denitrification after combustion. Classified from the principle of denitrification, the control technology of nitrogen oxides can be divided into catalytic reduction method, solid adsorption method, liquid absorption method and biochemical treatment technology; according to the sequence of treatment process, it can be divided into denitrification before fuel combustion, combustion method control and combustion After denitrification. Among them, Selective catalytic reduction (SCR), because of its high denitrification efficiency, good selectivity, and relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/889B01D53/90B01D53/56
Inventor 张丹姜英男张赫孙成勋
Owner STATE GRID CORP OF CHINA
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