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

A composite catalyst, desulfurization and denitration technology, applied in the field of Ce-based composite catalyst and its preparation, can solve the problems of low low temperature conversion rate, large energy consumption in high temperature section, inability to remove, etc., achieve high conversion rate, simplify technological process, The effect of high economic value and promotion value

Active Publication Date: 2017-07-25
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

[0007] The purpose of the present invention is to provide a Ce-based composite catalyst suitable for hydrogen sulfide catalytic reduction desulfurization and denitrification process and its preparation method, aiming to overcome the inability to simultaneously remove it and low temperature in the current catalytic desulfurization and denitration technology. Technical defects such as low conversion rate, many by-products, and high energy consumption in the high temperature section

Method used

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

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preparation example Construction

[0033] A preparation method of a Ce-based composite catalyst suitable for hydrogen sulfide catalytic reduction desulfurization and denitrification process includes the following steps:

[0034] 1) Prepare the composite carrier Al first 2 o 3 -TiO 2 ;

[0035] 2) Post-preparation of the composite catalyst CeO 2 / Al 2 o 3 -TiO 2 .

[0036] Preferably, in step 1), the Al 2 o 3 -TiO 2 It is prepared by sol-gel method with aluminum salt and titanate.

[0037] 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 .

[0038] Preferably, in step 2), the composite catalyst CeO 2 / Al 2 o 3 -TiO 2 It uses cerium salt and composite carrier Al 2 o 3 -TiO 2 Prepared by isometric impregnation.

[0039] Preferably, in step 2), the cerium salt is cerium nitrate; f...

Embodiment

[0042] a-Composite carrier AT (Al 2 o 3 -TiO 2 ) preparation method:

[0043] (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.

[0044] (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.

[0045] (3) Add 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.

[0046] (4) Put the above solution into a magnetic stirrer for heating and stirring until the solution is completely solidified into a white jelly.

[0047] (5) Aging the resulting white jelly for 12 hours, and then drying it in an oven at 110°C until white particles are formed.

[0048] (6) Put th...

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Abstract

The invention discloses a Ce-based composite catalyst suitable for hydrogen sulfide catalytic reduction desulfurization and denitrification processes and a preparation method thereof. The composite catalyst is prepared from an Al2O3-TiO2 composite carrier and an active component CeO2 supported by the carrier. The preparation method comprises 1) preparing an Al2O3-TiO2 composite carrier, and 2) preparing the composite catalyst CeO2 / Al2O3-TiO2. The preparation method of the catalyst is simple and has industrial large-scale production feasibility. In a common industrial catalytic temperature section at 200 to 400 DEG C, good simultaneous removal of two ingredients is realized and the amount of the by-product NH3 is low. The Ce-based composite catalyst has a high economic value and promotion value. In the later period, a high conversion rate of the nitrogen oxides and sulfides is realized through the modified catalyst and reaction conditions.

Description

technical field [0001] The invention relates to a Ce-based composite catalyst suitable for hydrogen sulfide catalytic reduction desulfurization and denitrification process and a preparation method thereof. Background technique [0002] It is well known that 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, the emission standards of nitrogen oxides and sulfur compounds at this stage have also been greatly improved on the basis of previous ones. 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 denitration method used in industry is generally based on wet method (also known as absorption method), and the absorption liquid used generally has certain oxidative properties to ensure that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/60
CPCB01D53/8637B01D2251/51B01D2258/0283B01J23/002B01J23/10B01J2523/00B01J2523/31B01J2523/3712B01J2523/47Y02A50/20
Inventor 江峰李浩吕向红周广英
Owner SOUTH CHINA NORMAL UNIVERSITY
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