Catalyst for efficiently removing formaldehyde in air or waste water at room temperature as well as preparation method thereof

A catalyst and high-efficiency technology, applied in the field of catalysis, can solve the problem of high consumption of precious metals, and achieve the effects of reducing production costs, excellent formaldehyde removal performance, and easy control

Active Publication Date: 2018-07-06
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN107376982A discloses a mesoporous silicon-supported nano-gold catalyst, w

Method used

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  • Catalyst for efficiently removing formaldehyde in air or waste water at room temperature as well as preparation method thereof
  • Catalyst for efficiently removing formaldehyde in air or waste water at room temperature as well as preparation method thereof
  • Catalyst for efficiently removing formaldehyde in air or waste water at room temperature as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Catalyst preparation

[0033] Weigh 2.74g Mn(NO 3 ) 2 4H 2 O was dissolved in 200ml deionized water and stirred for 30min to obtain solution A. Weigh 1.15g KMnO 4 Dissolve in 100ml deionized water and stir for 30min to prepare solution B. Solution B was slowly added dropwise to solution A, and 0.2 mol / L KOH solution was added dropwise to adjust the pH of the reaction mixture to 10. Add 1.26mL 1mg / mL PdCl 2 After solution, the reaction mixture was transferred to a hydrothermal reaction kettle for hydrothermal reaction at 100° C. for 8 h. After cooling to room temperature, filter, wash and dry, N 2 Pd / MnO was prepared by calcination at 400℃ for 4h in atmosphere 2 catalyst.

[0034] Before the formaldehyde catalytic oxidation reaction, the catalyst needs to be pre-reduced with hydrogen at 350°C for 1h, and then react in a continuous flow fixed bed with a reaction space velocity of 15000h -1 , the formaldehyde pollutant concentration is 500ppm, room temperature, n...

Embodiment 2

[0036] Catalyst preparation is with reference to embodiment 1, Mn(NO 3 ) 2 4H 2 O is replaced by MnSO 4 , KOH solution was replaced by NaOH solution, PdCl 2 The solution was changed to 1.98mL 1mg / mL H 2 PtCl 6 ·6H 2 O solution, and the rest of the conditions were the same, and Pt / MnO was prepared 2 catalyst. Evaluation conditions are the same as in Example 1, and the evaluation results are shown in Table 1.

Embodiment 3

[0038] Catalyst preparation is with reference to embodiment 1, Mn(NO 3 ) 2 4H 2 O is replaced by Mn(CH 3 COO) 2 4H 2 O, KOH solution is replaced by ammonia water, PdCl 2 The solution was changed to 1.92mL 1mg / mL RhCl 3 ·3H 2 O solution, the rest of the conditions are the same, and Rh / MnO 2 catalyst. Evaluation conditions are the same as in Example 1, and the evaluation results are shown in Table 1.

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Abstract

The invention discloses a catalyst for efficiently removing formaldehyde in air or waste water at room temperature as well as a preparation method thereof. In the catalyst, a trace amount of noble metal serves as an active component and manganese-based composite oxide serves as a carrier; the general formula can be expressed as M/M1Ox-MnO2; in the formula, M represents one of Ru, Rh, Pt or Pd, M1is one of Fe, Co, Ni, Cu or Ce and x is less than or equal to 2; the catalyst comprises 0.01 to 1 percent (preferably 0.05 to 0.8 percent) by weight of noble metal M and the balance of composite oxidecarrier, and the molar ratio of M1 to Mn is 0:1 to 1:1; and the catalyst can be prepared by a redox-hydrothermal one-step method. The prepared catalyst can effectively transform formaldehyde into carbon dioxide and water at room temperature, has high selectivity and has the advantages of energy saving and environmental friendliness. The preparation method of the catalyst has the advantages of lowcost, simplicity, practicability, mild condition, easiness in control, suitability for industrialized production and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a catalyst for efficiently removing formaldehyde in air or waste water at room temperature and a preparation method thereof. Background technique [0002] Formaldehyde ranks second on the list of toxic chemicals, and is determined by the World Cancer Society as a substance with strong carcinogenic and cancer-promoting effects. With the development of the economy, my country is currently facing serious formaldehyde pollution problems (air pollution and water pollution). Excessive formaldehyde content in the air will lead to leukemia in humans, and excessive formaldehyde content in water will destroy the ecological balance of water bodies and bring serious environmental problems. Therefore, formaldehyde pollution control and treatment has become the top priority of my country's environmental protection work. [0003] At present, the harmless removal methods of forma...

Claims

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Application Information

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IPC IPC(8): B01J23/656B01J23/89B01J37/08B01J37/10B01J37/18B01D53/86B01D53/72C02F1/58C02F101/34
CPCB01D53/72B01D53/8668B01D2257/704B01D2257/708B01J23/002B01J23/656B01J23/8986B01J37/088B01J37/10B01J37/18C02F1/58C02F2101/34
Inventor 陈秉辉朱慧娟张诺伟荣成礼耿莉莉郑进保
Owner XIAMEN UNIV
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