Coke oven flue gas denitration catalyst and preparation method thereof

A denitration catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as action mechanism description, activity decline, etc. Effect

Active Publication Date: 2017-07-28
马鞍山方信环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, patents CN103816919A and CN104096569A do not have any anti-SO 2 and the mechanism of water vapor poisoning
[0006] A large number of studies have shown that the denitrification efficiency of low-temperature denitrification catalysts can reach more than 90% at about 150 °C, but the activity of existing low-temperature denitrification catalysts is generally susceptible to SO 2 significantly reduced by the influence of water vapor

Method used

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  • Coke oven flue gas denitration catalyst and preparation method thereof
  • Coke oven flue gas denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: A coke oven flue gas denitrification catalyst and its preparation method

[0034] (1) Preparation of active components

[0035] The first step, the preparation concentration is the oxalic acid solution of 0.70mol / L, according to ammonium metavanadate (NH 4 VO 3 ) and oxalic acid (C 2 h 2 o 4 ) in a molar ratio of 1:2, chromium nitrate (Cr(NO 3 ) 3 ) and ammonium metavanadate (NH 4 VO 3 ) with a molar ratio of 0.005:1, a certain amount of NH 4 VO 3 and Cr(NO 3 ) 3 Added into the oxalic acid solution, and stirred at room temperature for 1 h; in the second step, a certain amount of phosphoric acid (H 3 PO 4 ), concentrated hydrochloric acid (HCl) and polyethylene glycol (PEG), where NH 4 VO 3 with H 3 PO 4 The molar ratio is 0.2:1, NH 4 VO 3 The molar ratio with HCl is 1:4, NH 4 VO 3 The mass ratio with PEG is 1:0.1, the hydrochloric acid mass percent concentration is 37wt%, the phosphoric acid mass percent concentration is 85wt%, and the po...

Embodiment 2

[0038] Example 2: A coke oven flue gas denitrification catalyst and its preparation method

[0039] (1) Preparation of active components

[0040] The first step, the preparation concentration is the oxalic acid solution of 0.70mol / L, according to ammonium metavanadate (NH 4 VO 3 ) and oxalic acid (C 2 h 2 o 4 ) in a molar ratio of 1:1, chromium nitrate (Cr(NO 3 ) 3 ) and ammonium metavanadate (NH 4 VO 3 ) with a molar ratio of 0.005:1, a certain amount of NH 4 VO 3 and Cr(NO 3 ) 3 Added into the oxalic acid solution, and stirred at room temperature for 1 h; in the second step, a certain amount of phosphoric acid (H 3 PO 4 ), concentrated hydrochloric acid (HCl) and polyethylene glycol (PEG), where NH 4 VO 3 with H 3 PO 4 The molar ratio is 0.2:1, NH 4 VO 3 The molar ratio with HCl is 1:4, NH 4 VO 3 The mass ratio with PEG is 1:0.1, the hydrochloric acid mass percent concentration is 36wt%, the phosphoric acid mass percent concentration is 85wt%, and the po...

Embodiment 3

[0043] Example 3: A coke oven flue gas denitrification catalyst and its preparation method

[0044] (1) Preparation of active ingredients

[0045] The first step, the preparation concentration is the oxalic acid solution of 0.70mol / L, according to ammonium metavanadate (NH 4 VO 3 ) and oxalic acid (C 2 h 2 o 4 ) in a molar ratio of 1:2, chromium nitrate (Cr(NO 3 ) 3 ) and ammonium metavanadate (NH 4 VO 3 ) with a molar ratio of 0.015:1, a certain amount of NH 4 VO 3 and Cr(NO 3 ) 3Added into the oxalic acid solution, and stirred at room temperature for 1 h; in the second step, a certain amount of phosphoric acid (H 3 PO 4 ), concentrated hydrochloric acid (HCl) and polyethylene glycol (PEG), where NH 4 VO 3 with H 3 PO 4 The molar ratio is 0.2:1, NH 4 VO 3 The molar ratio with HCl is 1:6, NH 4 VO 3 The mass ratio with PEG is 1:0.1, the hydrochloric acid mass percent concentration is 38wt%, the phosphoric acid mass percent concentration is 85wt%, and the po...

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Abstract

The invention discloses a coke oven flue gas denitration catalyst and a preparation method thereof. The preparation method utilizes ammonium metavanadate as an active precursor, chromium nitrate as an auxiliary agent and oxalic acid and hydrochloric acid as reducing agents, and utilizes phosphoric acid to adjust and control the surface acidity of an active component. The preparation method comprises stirring, water bath heating, drying, calcining to obtain a Cr-doped oxyvanadium phosphate active component, adding the Cr-doped oxyvanadium phosphate active component and anatase TiO2 as a carrier with a specific surface area of greater than or equal to 250 m<2>/g into distilled water according to a ratio, carrying out stirring mixing, and carrying out water bath drying and calcining to obtain the catalyst. The catalyst utilizes phosphoric acid to adjust and control the surface acidity of the catalyst, and utilizes aid chromic nitrate to form an intercalation structure and promote formation of adjacent V<5+> and V<4+>. The catalyst has good low temperature denitration activity and strong SO2 and steam poisoning resistance and is suitable for industrial coke oven flue gas denitrification.

Description

technical field [0001] The invention belongs to the field of air pollution control and environmental catalytic materials, and relates to a titanium-based carrier-loaded chromium-doped vanadyl phosphate coke oven flue gas denitrification catalyst and a preparation method thereof. Background technique [0002] Coke oven flue gas is an important nitrogen oxide (NO x ) emission sources, posing a greater threat to the atmospheric environment. According to statistics, the total number of coke ovens in my country currently exceeds 2,000, and the annual output of coke is nearly 5 billion tons. x More than 900,000 tons / year. Relative to coal-fired flue gas NO x In terms of control, coke oven flue gas NO in my country x The control started late. In the "Emission Standard of Pollutants for Coking Chemical Industry" (GB16717-2012) promulgated in 2012, it was the first time that coking enterprises NO x The emission concentration has been restricted, and the standard was officially i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199B01D53/86B01D53/56
Inventor 贾勇陈光杨建华陈宜华吴胜华刘小芳朱宝忠包向军
Owner 马鞍山方信环保科技有限公司
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