Fe-Ce composite catalyst for hydrogen sulfide-based catalytic reduction desulfurization and denitrification process and preparation method thereof

A composite catalyst, desulfurization and denitrification technology, which is applied in the field of Fe-Ce-based composite catalyst and its preparation, can solve the problems of low conversion rate at low temperature, inability to remove, high energy consumption in high temperature section, etc., and achieve high installation and maintenance costs Effect

Active Publication Date: 2017-07-18
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It aims to overcome the technical defects in the current catalytic desulfurization and denitrification technology, such as the inability to remove them at the same time, the low conversion rate at low temperature, and the high energy consumption in the high temperature section.

Method used

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  • Fe-Ce composite catalyst for hydrogen sulfide-based catalytic reduction desulfurization and denitrification process and preparation method thereof
  • Fe-Ce composite catalyst for hydrogen sulfide-based catalytic reduction desulfurization and denitrification process and preparation method thereof
  • Fe-Ce composite catalyst for hydrogen sulfide-based catalytic reduction desulfurization and denitrification process and preparation method thereof

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preparation example Construction

[0030] The preparation method of a Fe-Ce-based composite catalyst suitable for hydrogen sulfide catalytic reduction desulfurization and denitrification process comprises the following steps:

[0031] 1) Prepare composite carrier Al first 2 o 3 -TiO 2 ;

[0032] 2) Post-preparation of the composite catalyst Fe 2 o 3 -CeO 2 / Al 2 o 3 -TiO 2 .

[0033] Preferably, in step 1), the Al 2 o 3 -TiO 2 It is prepared by sol-gel method with aluminum salt and titanate.

[0034]Preferably, in step 1), the aluminum salt is aluminum nitrate; the titanate is tetrabutyl titanate; the molar ratio of aluminum nitrate to tetrabutyl titanate is 2:1; further , the aluminum nitrate is Al(NO 3 ) 3 9H 2 O; The tetrabutyl titanate is Ti(OC 4 h 9 ) 4 .

[0035] Preferably, in step 2), the composite catalyst Fe 2 o 3 -CeO 2 / Al 2 o 3 -TiO 2 After mixing the iron salt and cerium salt, and then with the composite carrier Al 2 o 3 -TiO 2 Prepared by isometric impregnation.

[0...

Embodiment

[0040] a-Composite carrier AT(Al 2 o 3 -TiO 2 ) preparation method:

[0041] (1) In a 250ml beaker, add 2.4molC in sequence 2 h 5 OH, 0.9molCH 3 COOH, and 1.8 mol of deionized water, and then uniformly stirred for 1 min until completely mixed uniformly to prepare a mixed solvent.

[0042] (2) Weigh 0.2mol of Al(NO 3 ) 3 9H 2 O, then pour it into the mixed solvent prepared above, and stir until it is completely dissolved.

[0043] (3) 0.1mol of Ti(OC 4 h 9 ) 4 Slowly add the above-mentioned dissolved Al(NO 3 ) 3 9H 2 in a mixed solution of O. After the addition is complete, it is stirred and allowed to stand until a single homogeneous mixed solution is formed.

[0044] (4) Put the above-mentioned solution into a magnetic stirrer and heat and stir until the solution is completely solidified into a white jelly.

[0045] (5) Aging the resulting white jelly for 12 hours, and then putting it into an oven at 110° C. for drying until white particles are formed.

[00...

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Abstract

The invention discloses a Fe-Ce composite catalyst for a hydrogen sulfide-based catalytic reduction desulfurization and denitrification process and a preparation method thereof. The composite catalyst is prepared by taking Al2O3-TiO2 as a compound carrier and loading an active component Fe2O3-CeO2. The invention also discloses the preparation method for the Fe-Ce composite catalyst for the hydrogen sulfide-based catalytic reduction desulfurization and denitrification process. The preparation method comprises the following steps: 1) firstly preparing the compound carrier Al2O3-TiO2; and 2) preparing the composite catalyst Fe2O3-CeO2/Al2O3-TiO2. The catalyst prepared according to the method is simple in process, is convenient in large-scale industrial production and can realize synchronous removal within a common industrial catalytic temperature segment under lower temperature of 160-240 DEG C, so that the composite catalyst has higher economic value and promotional value. In later period, the higher conversion rate of nitric oxide and sulfide can be realized in the manner of further modifying the catalyst, including further increasing or reducing Ce and Fe contents, or adding other trace components and even optimizing the reaction condition.

Description

technical field [0001] The invention relates to an Fe-Ce-based composite catalyst suitable for hydrogen sulfide catalytic reduction desulfurization and denitrification process and a preparation method thereof. Background technique [0002] As we all know, a large amount of nitrogen oxides (NOx) and sulfides (mainly SO 2 ) will lead to the aggravation of smog and photochemical smog, and cause great harm to human health. In addition, various emission standards are also increasing year by year. Therefore, it is necessary to simultaneously remove nitrogen oxides and sulfides in the flue gas so that their concentrations can reach the emission standard. [0003] At present, the synchronous desulfurization and denitrification methods used in the industry are generally wet methods, which mainly use oxidizing solutions to absorb soluble SO 2 While oxidizing insoluble NOx (mainly NO) into soluble NOx (mainly NO 2 ) and absorb it. However, due to the fact that the equipment usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/60
CPCB01D53/8609B01D53/8628B01D2255/40B01J23/002B01J23/83B01J2523/00B01J2523/31B01J2523/3712B01J2523/47B01J2523/842Y02A50/20
Inventor 江峰朱瑾蓝敏怡伍健麟李浩吕向红周广英
Owner SOUTH CHINA NORMAL UNIVERSITY
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