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Denitration catalyst with low sulfur dioxide oxidation rate and preparation method thereof

A technology of denitrification catalyst and sulfur dioxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc. It can solve the problems of increasing cost, affecting the operation of denitrification system, and high oxidation rate , to achieve the effect of reducing production, good oxygen storage performance and reducing oxidation rate

Active Publication Date: 2013-08-14
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The use of high-sulfur coal in high-temperature conditions not only makes the desulfurization system of the power plant operate at a high load (3% sulfur in coal produces at least 6000mg / Nm 3 SO 2 ), which increases the cost, and its oxidation rate at high temperature is much higher than that in the middle temperature region, resulting in a large amount of SO 3 The generated ammonium bisulfate will greatly affect the operation of the denitrification system

Method used

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Comparison scheme
Effect test

Embodiment 1

[0014] The preparation method of the denitration catalyst of the low sulfur dioxide oxidation rate of the present embodiment comprises the following steps:

[0015] 1) Preparation of silicon-aluminum composite oxide: Prepare a dilute nitric acid solution with a concentration of 1mol / L, add 24.3kg of tetraethyl orthosilicate, and heat in a water bath at 50°C for 1 hour to form a transparent solution; then add 9.1kg to the transparent solution Aluminum isopropoxide, continue to stir for 12 hours, control the pH value at about 4; then filter the resulting material, then dry at 100°C for 12 hours, and then roast at 400°C for 4 hours to obtain a silicon-aluminum composite oxide thing;

[0016] 2) Take 8kg of silicon-aluminum composite oxide, 77kg of titanium dioxide, 1kg of ammonium metavanadate, 9kg of ammonium paratungstate, 3kg of niobium nitrate, 3kg of rare earth oxide, 3kg of molding auxiliary materials, an appropriate amount of deionized water and 0.5mol / L oxalic acid to ful...

Embodiment 2

[0020] The preparation method of the denitration catalyst of the low sulfur dioxide oxidation rate of the present embodiment comprises the following steps:

[0021] 1) Preparation of silicon-aluminum composite oxide: Prepare a dilute nitric acid solution with a concentration of 2mol / L, add 56.7kg of tetraethyl orthosilicate, and heat in a water bath at 60°C for 2 hours to form a transparent solution; then add 28.4kg to the transparent solution Aluminum isopropoxide, continue to stir for 13 hours, control the pH value at about 5; then filter the resulting material, then dry at 110°C for 13 hours, and then bake at 450°C for 5 hours to obtain a silicon-aluminum composite oxide thing;

[0022] 2) Take 15kg of silicon-aluminum composite oxide, 80kg of titanium dioxide, 1.5kg of ammonium metavanadate, 10kg of ammonium paratungstate, 1.5kg of niobium nitrate and 2.5kg of rare earth oxide, 4kg of molding auxiliary materials, appropriate amount of deionized water and 0.3mol / L of oxalic...

Embodiment 3

[0026] The preparation method of the denitration catalyst of the low sulfur dioxide oxidation rate of the present embodiment comprises the following steps:

[0027] 1) Preparation of silicon-aluminum composite oxide: prepare a dilute nitric acid solution with a concentration of 3mol / L, add 74.7kg of tetraethyl orthosilicate, and heat in a water bath at 70°C for 3 hours to form a transparent solution; then add 56.1kg to the transparent solution Aluminum isopropoxide, continue to stir for 14 hours, control the pH value at about 6; then filter the resulting material, then dry at 120°C for 14 hours, and then roast at 500°C for 4.5 hours to obtain a silicon-aluminum composite oxide thing;

[0028] 2) Take 3kg of silicon-aluminum composite oxide, 81kg of titanium dioxide, 1kg of ammonium metavanadate, 8kg of ammonium paratungstate, 4kg of niobium nitrate, 4kg of rare earth oxide, 3kg of molding auxiliary materials, an appropriate amount of deionized water and 0.2mol / L oxalic acid to...

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Abstract

The invention discloses a denitration catalyst with a low sulfur dioxide oxidation rate and a preparation method thereof. The denitration catalyst mainly comprises the following components in parts by mass: 70-92 parts of titanium dioxide, 0.3-1.5 parts of vanadium pentoxide, 2-10 parts of tungsten trioxide, 1-5 parts of niobium oxide, 2-5 parts of rare earth oxide and 2-14 parts of silica-alumina mixed oxide. The preparation method comprises the following steps: 1) preparing the silica-alumina mixed oxide; 2) fully mixing and stirring a formula amount of silica-alumina mixed oxide, titanium dioxide, ammonium metavanadate, ammonium paratungstate, niobium nitrate, rare earth oxide, auxiliary shaping materials, deionized water and oxalic acid; and 3) performing extrusion molding on the shaping colloid obtained in the step 2) through a thin-walled die, drying and roasting. The activity of the denitration catalyst is equivalent to that of a common SCR (selective catalytic reduction) denitration catalyst under the high-temperature high-sulfur conditions, and the sulfur dioxide oxidation rate is only 60-80 percent of that of the SCR denitration catalyst.

Description

technical field [0001] The invention relates to the technical field of SCR denitration catalysts, in particular to a denitration catalyst with a low sulfur dioxide oxidation rate and a preparation method thereof. Background technique [0002] With the increasing pollution of nitrogen oxide emissions, the state has increased the control of nitrogen oxide emissions during the "Twelfth Five-Year Plan" period. At home and abroad, there are many studies on the poisoning mechanism of SCR catalysts and the sulfur resistance of catalysts at low temperatures, but for reducing SO 2 The research on the catalyst formulation of the oxidation rate is rarely involved, mainly because the existing SCR catalysts are low in sulfur content (SO 2 Concentration less than 6000mg / Nm 3 ) has good sulfur resistance, SO 2 The oxidation rate is less than 1%, which can basically meet the engineering requirements. However, my country's coal quality conditions are complex, and most of the sulfur conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01J23/30B01D53/86
Inventor 黄锐周林陈亮刘红辉成丹席文昌袁鹏邓巧莲刘伟段明华洪燕黄新竹魏丽斯龙顺峰杨培相
Owner CHONGQING YUANDA CATALYST MFG
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