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Heteroatom-resistant combustion catalyst as well as preparation method and application thereof

A technology of combustion catalysts and heteroatoms, applied in the direction of combustion methods, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve problems such as inability to run stably for a long time, inability to apply waste gas treatment, and strong resistance to chlorine poisoning. Achieve high catalytic activity and stability, low manufacturing cost, good sulfur and halogen resistance

Pending Publication Date: 2021-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN102553585A discloses a sulfur-resistant catalyst for gas deoxidation and its preparation method and application. Mo is added to the catalyst, and pre-sulfurization is required to ensure the sulfur-resistant performance of the catalyst, and the activity of the catalyst is not high.
Chinese patent CN105709854A discloses a metal matrix catalytic combustion catalyst and its preparation method. 2 Under working conditions, it cannot run stably for a long time
Chinese patent CN10389425A discloses a catalyst for the catalytic combustion of polychlorinated aromatic hydrocarbons, which is Fe, Ni, Cr, Bi or Mn doped with tricobalt tetroxide. The catalyst has high catalytic activity and strong resistance to chlorine poisoning, but its structure is fragile. Unsuitable for exhaust gas treatment at high space velocity

Method used

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  • Heteroatom-resistant combustion catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Preparation of composite oxide C1

[0062] Weigh 29.4g of nine-fold aluminum nitrate and dissolve it in 150ml deionized water to obtain solution A1, weigh 5.27g of nine-fold chromium nitrate and dissolve it in 50ml of deionized water to obtain solution B1, mix solutions A1 and B1, and stir for 2h. Heat the mixed solution to 70°C, add concentrated ammonia water (concentration: 25%) dropwise until the pH value of the solution reaches 8, reflux for 12 hours (reflux temperature is 50°C), and put the mixed solution at a temperature of 20°C and a relative humidity range (10~ 95%) for 24 hours, filtered and washed with deionized water for 3 times, dried at 120°C for 24 hours, and calcined at 600°C for 4 hours to obtain a composite oxide;

[0063] Preparation of coating slurry D1

[0064] The composite oxide C1 (5g, composite oxide Al 2 o 3 with Cr 2 o 3 Mass ratio 1:0.25), the concentrated nitric acid of the pseudo-boehmite of 0.8g, 0.1ml joins 30ml deionized water, joins...

Embodiment 2

[0069] Preparation of composite oxide C2

[0070] Weigh 23.5g of Jiuheshui aluminum nitrate and dissolve it in 150ml deionized water to obtain solution A2, weigh 2.02g of Liuheshui cerium nitrate and dissolve it in 50ml of deionized water to obtain solution B2, mix solutions A2 and B2, stir for 2h, and The mixed solution was heated to 80°C, and concentrated ammonia water (concentration: 25%) was added dropwise until the pH value of the solution reached 9, refluxed for 8 hours (reflux temperature was 50°C), and the mixed solution was kept at a temperature of 20°C and a relative humidity range (10-95 %) standing in the environment for aging for 24 hours, filtering and washing with deionized water for 3 times, drying at 120°C for 24 hours, and roasting at 600°C for 4 hours to obtain composite oxide C2;

[0071] Preparation of coating slurry D2

[0072] The composite oxide C2 (4g, composite oxide Al 2 o 3 with CeO 2 Mass ratio 1:0.25), the concentrated nitric acid of the pseud...

Embodiment 3

[0077] Preparation of composite oxide C3

[0078] Weigh 23.5g of nonaqueous aluminum nitrate and dissolve it in 150ml of deionized water to obtain solution A3, weigh 2.78g of pentahydric zirconium nitrate and dissolve it in 50ml of deionized water to obtain solution B3, mix solutions A3 and B3, and stir for 2h. The mixed solution was heated to 80°C, and concentrated ammonia water (25% concentration) was added dropwise until the pH value of the solution reached 9, refluxed for 8 hours (reflux temperature was 50°C), aged at room temperature for 24 hours, filtered and washed 3 times with deionized water, Dry at 120°C for 24 hours, and bake at 600°C for 4 hours to obtain composite oxide C3;

[0079] Preparation of coating slurry D3

[0080] Composite oxide C3 (4g, composite oxide Al 2 o 3 with ZrO 2 Mass ratio 1:0.25), the concentrated nitric acid of the pseudo-boehmite of 0.6g, 0.1ml joins in 24ml deionized water, joins this mixture in the ball mill jar, under 500 revs / min of...

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Abstract

The invention discloses a heteroatom-resistant combustion catalyst as well as a preparation method and application thereof. The heteroatom-resistant combustion catalyst comprises a composite matrix and an active component, wherein the composite matrix comprises a honeycomb carrier and a composite oxide; the composite oxide is coated on the surface of the honeycomb carrier; the composite oxide comprises Al2O3 and an L acid metal oxide; the active component is loaded on the composite matrix through impregnation, the active component comprises precious metal, and the precious metal is selected from at least one of Pt and Pd. The heteroatom-resistant combustion catalyst disclosed by the invention can purify the atmosphere of volatile organic compounds (VOCs) containing sulfur, chlorine and other heteroatoms, has higher activity and stability, and overcomes the defect that the traditional combustion catalyst is easy to inactivate in the atmosphere containing sulfur and chlorine. The catalyst is simple in preparation process, low in cost and suitable for efficient removal and purification of VOCs gas containing heteroatoms.

Description

technical field [0001] The application relates to a heteroatom combustion-resistant catalyst, its preparation method and application, and belongs to the fields of catalyst and environmental protection. Background technique [0002] At present, VOCs removal technologies mainly include adsorption method, direct combustion method, low-temperature plasma method and catalytic combustion method. Among them, catalytic combustion method is considered to be the most effective treatment method because of its advantages such as low ignition temperature, high treatment efficiency and not easy to generate secondary pollution. One of the most promising technologies for VOCs. For volatile organic compound combustion catalysts containing heteroatoms such as sulfur and halogen, the active sites are easily eroded by halogen and sulfur during the catalytic reaction process, resulting in catalyst deactivation, which may be due to the typical sulfur-containing and halogen-containing VOCs combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/652B01J35/04F23G7/07
CPCB01J23/002B01J23/6522B01J23/44F23G7/07B01J2523/00F23G2209/14B01J35/56B01J2523/31B01J2523/3712B01J2523/48Y02A50/20
Inventor 王胜王树东林乐倪长军汪明哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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