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SCR (selective catalytic reduction) denitration catalyst for accelerating ammonium hydrogen sulfate decomposition by low-temperature flue gas, preparation method and application

A denitrification catalyst, ammonium bisulfate technology, applied in the field of SCR denitrification catalyst, can solve the problems of increased NOx emission concentration and lower denitrification activity, and achieve the effect of promoting low-temperature decomposition, simple preparation method, and promoting decomposition behavior

Active Publication Date: 2017-10-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the presence of a certain amount of SO in the flue gas 3 As well as water vapor, when the flue gas temperature is lower than 300°C, the reducing agent ammonia and SO 3 , Water vapor reacts to form ammonium bisulfate and deposits on the catalyst, thereby covering the active sites of the catalyst and blocking the pores, thereby reducing the denitrification activity and leading to an increase in NOx emission concentration

Method used

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  • SCR (selective catalytic reduction) denitration catalyst for accelerating ammonium hydrogen sulfate decomposition by low-temperature flue gas, preparation method and application
  • SCR (selective catalytic reduction) denitration catalyst for accelerating ammonium hydrogen sulfate decomposition by low-temperature flue gas, preparation method and application

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Effect test

Embodiment 1

[0035] The catalyst raw materials are: 11.0674g of titanium sulfate, 3.4687g of stannous chloride, 0.1543g of ammonium metavanadate, and 0.3281g of ammonium tungstate;

[0036]Preparation method: first dissolve titanium sulfate and stannous chloride in dilute sulfuric acid, then slowly add the titanium sulfate solution dropwise to excess ammonia water and stir at a speed of 600r / min for 12h, filter the obtained solid-liquid mixture and Wash 5 times, dry the obtained solid at 110°C for 12h, and calcinate at 500°C for 5h after grinding to obtain carrier powder; dissolve ammonium metavanadate and ammonium tungstate in oxalic acid solution (the molar ratio of oxalic acid to ammonium metavanadate is 2:1 ), to obtain a clear solution, add the carrier powder, use a rotary evaporator to stir at 170r / min for 30min in a water bath at 60°C, and evaporate the water to dryness. The obtained solid is baked at 110°C for 12h, ground and calcined at 500°C for 5h to produce The molar ratio of S...

Embodiment 2

[0038] The catalyst raw materials are: 13.5225g of titanium sulfate, 7.5883g of iron nitrate, 0.1543g of ammonium metavanadate, and 0.3281g of ammonium tungstate;

[0039] Preparation method: first dissolve titanium sulfate and ferric nitrate in dilute sulfuric acid, then slowly add the titanium sulfate solution dropwise to excess ammonia water and stir at a speed of 600r / min for 12 hours, filter and wash the obtained solid-liquid mixture for 5 times , the obtained solid was baked at 110°C for 12 hours, and after grinding, it was calcined at 500°C for 5 hours to obtain carrier powder; dissolving ammonium metavanadate and ammonium tungstate in oxalic acid solution to obtain a clear solution, adding carrier powder, and using a rotary evaporator in a 60°C water bath Stir at 170r / min for 30min and evaporate the water to dryness. The obtained solid is baked at 110°C for 12h, ground and calcined at 500°C for 5h, and the molar ratio of Fe element to Ti element is 1:3, V 2 o 5 、WO 3...

Embodiment 3

[0041] The catalyst raw materials are: 14.8657g of titanium sulfate, 7.7456g of aluminum nitrate, 0.1543g of ammonium metavanadate, and 0.3281g of ammonium tungstate;

[0042] Preparation method: first dissolve titanium sulfate and aluminum nitrate in dilute sulfuric acid, then slowly add the titanium sulfate solution dropwise to excess ammonia water and stir at a speed of 600r / min for 12 hours, filter and wash the obtained solid-liquid mixture for 5 times , the obtained solid was baked at 110°C for 12 hours, and after grinding, it was calcined at 500°C for 5 hours to obtain carrier powder; dissolving ammonium metavanadate and ammonium tungstate in oxalic acid solution to obtain a clear solution, adding carrier powder, and using a rotary evaporator in a 60°C water bath Stir at 170r / min for 30min and evaporate the water to dryness. The obtained solid is baked at 110°C for 12h, ground and calcined at 500°C for 5h, and the molar ratio of Al to Ti is 1:3, V 2 o 5 、WO 3 with TiO ...

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Abstract

The invention relates to an SCR (selective catalytic reduction) denitration catalyst, in particular to an SCR (selective catalytic reduction) denitration catalyst for accelerating ammonium hydrogen sulfate decomposition by low-temperature flue gas, a preparation method and an application. The SCR denitration catalyst takes composite oxides formed by titanic oxides and transition metal oxides as carriers, vanadium oxides as active components and tungsten oxides as co-catalysts, the molar ratio of transition metal elements to titanium elements in the catalyst is (0.1-0.5):1, and the transition metal oxides include one or more of MnO2, Fe2O3, CeO2, ZrO2, Al2O3, SnO2, Nb2O5 and Sb2O5. An appropriate quantity of transition metal oxides are added into the catalyst, the SCR denitration catalyst for accelerating low-temperature decomposition of ammonium hydrogen sulfate is prepared, and the catalyst accelerates the ammonium hydrogen sulfate to decompose at the temperature lower than 350 DEG C.

Description

technical field [0001] The invention relates to an SCR denitration catalyst, in particular to an SCR denitration catalyst used for low-temperature flue gas to promote the decomposition of ammonium bisulfate, a preparation method and an application. Background technique [0002] following SO 2 Afterwards, nitrogen oxides (NOx) are currently a major cause of acid rain, photochemical smog, and the destruction of the ozone layer. With the development of my country's productivity, the emission of nitrogen oxides has increased year by year, which has seriously endangered social development and human health, and has become the focus of energy conservation and emission reduction. At present, selective catalytic reduction flue gas denitrification (SCR) is the most widely used flue gas treatment technology in the world, and SCR catalyst is the core component of this technology, and its chemical composition and physical structure have a crucial impact on the denitrification efficiency...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/34B01J23/888B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J23/002B01J23/30B01J23/34B01J23/888B01D2258/0283B01D2251/2062B01J2523/00B01J35/00B01J35/30B01J2523/55B01J2523/69B01J2523/47B01J2523/43B01J2523/842B01J2523/31B01J2523/48B01J2523/3712B01J2523/72
Inventor 高翔郑成航岑可法曲瑞暘叶栋宋浩吴卫红苏传城
Owner ZHEJIANG UNIV
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