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Nitric acid exhaust gas denitration catalyst and preparation method thereof

A technology for denitrification catalyst and nitric acid tail gas, which is applied in the field of denitrification catalyst for NOx removal in nitric acid tail gas and its preparation. It can solve the problems of complex molding process, inapplicability of nitric acid tail gas, and no nitric acid pollutant discharge standard, and achieve simple preparation process. , Carrier sources are extensive and reliable, product quality is stable and reliable

Active Publication Date: 2012-08-15
HAISO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before 2011, my country did not have a specific pollutant discharge standard for the nitric acid industry
[0003] At present, domestic research on denitrification mainly focuses on the field of flue gas denitrification, and the selective catalytic reduction (SCR) process using ammonia as the reducing agent is usually used. 2 o 5 / TiO 2 series, the catalyst has high catalytic activity, but it has the following disadvantages in domestic applications: first, the reaction temperature is relatively high, and the operating temperature must be ≥ 350°C; second, the catalyst is generally prepared by coating method, and the active components are easy to fall off , poor water and acid resistance; third, high-purity titanium oxide is used as the carrier, which cannot be produced domestically, and the molding process is complicated and expensive; fourth, the core technology of the catalyst is monopolized by foreign countries, and it needs to pay a higher price for domestic promotion and application. fee
However, the exhaust temperature of nitric acid tail gas is generally low (<100°C), the content of nitrogen oxides is high, the relative humidity is high, and it contains acid mist. Therefore, traditional flue gas denitrification catalysts are not suitable for NOx removal of nitric acid tail gas and need to be developed. Dedicated nitric acid tail gas denitrification catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Weigh 10 grams of ferric nitrate and 10 grams of magnesium nitrate and dissolve them in 40 ml of water to obtain an additive solution;

[0028] 2. Add 100 grams of spherical activated alumina to the above-mentioned additive solution, and mix well to obtain a carrier impregnated with the additive;

[0029] 3. Dry the above-mentioned carrier impregnated with additives, then raise the temperature to 360°C for 2 hours, and cool naturally to room temperature to obtain the carrier containing additives;

[0030] 4. Add the above-mentioned carrier containing additives into 50 grams of solution made of 10 grams of copper nitrate, and mix well to obtain a catalyst impregnated with active components;

[0031] 5. Dry the catalyst impregnated with active components at 120° C. for 5 hours, and cool naturally to room temperature to obtain a nitric acid tail gas denitration catalyst.

[0032] Gained catalyst mass percent composition is: 3.2% CuO, 1.5% Fe 2 o 3 , 1.8% MgO, the res...

Embodiment 2

[0035] 1. Weigh 26 grams of chromium nitrate and 25 grams of titanium sulfate and dissolve them in 35 milliliters of water to obtain an additive solution;

[0036] 2. Add 100 grams of spherical activated alumina to the above-mentioned additive solution, and mix well to obtain a carrier impregnated with the additive;

[0037] 3. Dry the above-mentioned carrier impregnated with additives, then raise the temperature to 250°C for 2 hours, and cool naturally to room temperature to obtain the carrier containing additives;

[0038] 4. Add the above-mentioned carrier containing additives into 50 grams of solution made of 3 grams of copper nitrate, and mix well to obtain a catalyst impregnated with active components;

[0039] 5. Dry the catalyst impregnated with active components at 150° C. for 10 hours, and cool naturally to room temperature to obtain a nitric acid tail gas denitration catalyst.

[0040] Gained catalyst mass percent composition is 1.0% CuO, 4.4% Cr 2 o 3 , 4.7% TiO...

Embodiment 3

[0043] 1. Weigh 2 grams of nickel nitrate and 1.4 grams of zirconium nitrate and dissolve them in 65 ml of water to obtain an additive solution;

[0044] 2. Add 100 grams of spherical activated alumina to the above-mentioned additive solution, and mix well to obtain a carrier impregnated with the additive;

[0045] 3. Dry the above-mentioned carrier impregnated with additives, then raise the temperature to 600°C for 2 hours, and cool naturally to room temperature to obtain the carrier containing additives;

[0046] 4. Add the above-mentioned carrier containing additives into 50 grams of solution made from 33 grams of copper nitrate, and mix thoroughly to obtain a catalyst impregnated with active components;

[0047] 5. Dry the catalyst impregnated with active components at 180° C. for 3 hours, and cool naturally to room temperature to obtain a nitric acid tail gas denitration catalyst.

[0048] The mass percent composition of the catalyst is: 10.0% CuO, 0.5% NiO, 0.5% ZrO 2 ...

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Abstract

The invention discloses a nitric acid exhaust gas denitration catalyst and a preparation method thereof. In the catalyst, active aluminum oxide is used as a support, copper oxide is used as an active component, and two MOxs are used as assistants, wherein M is ferrum, chromium, nickel, vanadium, manganese, zinc, magnesium, titanium, zirconium, molybdenum, tungsten or cerium. The catalyst comprises the following components in percentage by mass: 1-10% of copper oxide, 1-25% of two MOxs and the balance of aluminum oxide support. The preparation method comprises the following steps: impregnating active aluminum oxide in an assistant metal salt solution, drying by roasting, impregnating in a cupric salt solution, and drying to obtain the catalyst. The catalyst disclosed by the invention is suitable for removing NOx in the nitric acid exhaust gas, and the lowest reaction temperature can reach 120 DEG C. The catalyst has the obvious advantages of low activity initiating temperature, high NOx conversion rate, simple preparation technique and the like.

Description

technical field [0001] The invention relates to a denitration catalyst and a preparation method thereof, in particular to a denitration catalyst suitable for removing NOx in nitric acid tail gas and a preparation method thereof. Background technique [0002] my country is a big producer of nitric acid. In 2008, the total output of nitric acid reached 7.777 million tons, ranking first in the world. According to the habit of industry division, the nitric acid industry mentioned here refers to the generalized nitric acid industry, including concentrated nitric acid, dilute nitric acid, and nitrates. At present, the nitric acid industry is in a state of super-high-speed development, and is marching towards a powerful nitric acid production country. Before 2011, my country did not have specific pollutant discharge standards for the nitric acid industry. Nitric acid industrial waste gas discharge implements "Comprehensive Emission Standard of Air Pollutants" (GB16297-1996), and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/86B01J23/755B01J23/887B01J23/83B01J23/889B01D53/86B01D53/56
Inventor 李小定章小林李璐王杰李耀会
Owner HAISO TECH