Flue gas H2-SCR denitration catalyst and preparation method thereof

A technology of H2-SCR and denitrification catalyst, which is applied in the field of flue gas H2-SCR denitrification catalyst and its preparation, can solve the problem of low-temperature activity decline of Pd catalyst, and achieve the effect of improving low-temperature denitrification activity and high catalytic activity

Inactive Publication Date: 2019-09-20
北京氦舶科技有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the reduction of the noble metal loading will lead to a significant decrease in the low-temperature activity of the Pd catalyst.

Method used

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  • Flue gas H2-SCR denitration catalyst and preparation method thereof

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preparation example Construction

[0028] The preparation method of the above-mentioned flue gas H2-SCR catalyst comprises the following steps:

[0029] (1) Add a dispersant to the noble metal salt solution and mix evenly to obtain a mixed solution; (2) Mix the reducing agent with the mixed solution at ultra-low temperature to react to obtain a metal sol; (3) impregnate the carrier in the above metal sol , filtered, washed, and dried to obtain the H2-SCR catalyst.

[0030] Further, the mass of the dispersant in step (1) is 1.0-1.5 times the mass of the noble metal, for example 1, 1.1, 1.2, 1.3, 1.4, 1.5 times; the dispersant is polyvinyl alcohol (PVA), Any one or more of polyvinylpyrrolidone (PVP) or aniline.

[0031] Further, the concentration of the noble metal salt solution in step (1) is 0.00003-0.01mol / L, such as 0.00003, 0.001, 0.02, 0.003, 0.004, 0.005, 0.06, 0.007, 0.008, 0.009, 0.01mol / L; The solvent of the noble metal salt solution is a non-freezing antifreeze solvent in an ultra-low temperature env...

Embodiment 1

[0048] Configure 20mL0.00003mol / L H 2 PtCl 6 solution and 10mL of 0.0003mol / L NaBH 4 Solution (the solvent is composed of water and ethanol in a volume ratio of 2:8); at room temperature, in H 2 PtCl 6 Add 0.14mgPVA to the solution, and mix evenly at a stirring rate of 500r / min to obtain a mixed solution; put the mixed solution in an ultra-low temperature box at -50°C for 30min, and then use a peristaltic pump to pump NaBH 4 The solution was added to the mixed solution at a speed of 0.5mol / min, and reacted for 1h at a stirring rate of 500r / min to obtain a metal sol; at room temperature, 1g Al was added to the metal sol 2 o 3 , impregnated for 1 h at a stirring rate of 500 r / min, vacuum filtered and washed at -50° C., and dried at room temperature to prepare a single-atom catalyst with a Pt content of 0.01%. The catalyst is in H 2 The conversion rate at 50°C in the low-temperature reduction NO test reached 82%, and the N 2 Selectivity 85%.

Embodiment 2

[0050] Configure 20mL 0.0003mol / L H 2 PtCl 6 solution and 10mL of 0.003mol / L NaBH 4 Solution (the solvent is composed of water and ethanol in a volume ratio of 2:8); at room temperature, in H 2 PtCl 6 Add 1.4mg of PVP to the solution, and mix evenly at a stirring rate of 500r / min to obtain a mixed solution; put the mixed solution in an ultra-low temperature box at -50°C for 30 minutes, and then use a peristaltic pump to pump NaBH 4 The solution was added to the mixed solution at a speed of 0.5mol / min, and reacted for 1h at a stirring rate of 500r / min to obtain a metal sol; at room temperature, 1g TiO was added to the metal sol 2 , impregnated for 1 h at a stirring rate of 500 r / min, vacuum filtered and washed at -50° C., and dried at room temperature to prepare a single-atom catalyst with a Pt content of 0.1%. The catalyst is in H 2 The conversion rate at 50°C in the low-temperature reduction NO test reached 97%, and the N 2 Selectivity 85%.

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Abstract

The invention particularly relates to a flue gas H2-SCR denitration catalyst and a preparation method thereof, wherein the catalyst comprises a carrier and noble metals supported on the carrier; the noble metals are uniformly distributed on the carrier in the form of single atoms; the content of the noble metal is 0.01-0.2 wt%, and the particle size of the noble metal is 0.01-1 nm. The catalyst is prepared by an ultralow-temperature chemical reduction method. The catalyst is low in noble metal loading capacity, is in atomic dispersion, and shows good denitration catalytic activity. The method is simple and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalyst preparation and air pollution control, and in particular relates to a flue gas H2-SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx for short) is a common air pollutant that can cause major environmental pollution problems such as smog, acid rain, photochemical smog, water eutrophication, and greenhouse effect. Its emission control is the goal of global environmental protection. The focus is also one of the important contents of my country's current air pollution control. Among them, Selective Catalytic Reduction (SelectiveCatalytic Reduction, SCR) is an effective means to control NOx under oxygen-enriched conditions. When NH3 is used as a reducing agent, the low-temperature activity (<300°C) of the traditional vanadium-tungsten-titanium catalyst needs to be improved. In addition, the toxicity of vanadium and leakage of am...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J23/63B01J37/02B01J37/16B01D53/86B01D53/56
CPCB01J23/42B01J23/44B01J23/464B01J23/63B01J37/0201B01J37/16B01D53/8628B01D2251/202B01D2258/0283
Inventor 郭文雅郎嘉良赵刚黄翟
Owner 北京氦舶科技有限责任公司
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