Catalyst for catalytic oxidation of formaldehyde pollutant at room temperature, preparation method and application thereof

A catalytic oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of complex catalyst preparation, high precious metal content, and poor formaldehyde purification effect. and other problems, to achieve the effect of high formaldehyde purification effect, repeatable preparation process and simple preparation process

Active Publication Date: 2019-08-16
江苏博斯纳环境科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

For example, Chinese patent CN 103736484 A mentioned a catalyst for catalyzing the oxidation of formaldehyde at room temperature. The catalyst is composed of titanium dioxide nanotube arrays loaded with noble metals. The catalyst has short life, relatively poor activity, and poor activity under anhydrous conditions.
Chinese patent CN 106040230 A mentions a metal-based anodized aluminum integrated catalyst for removing formaldehyde. The catalyst uses a special self-assembled and ordered anodized aluminum material self-grown by metal aluminum as the substrate, but its carrier and The preparation of the catalyst is complicated, secondary water pollution occurs during the preparation process, and the formaldehyde purification effect at room temperature is poor. "When the platinum content is 2-2.5wt%, the formaldehyde conversion rate reaches 72% at room temperature", and the precious metal content is relatively high , high cost, not conducive to promotion

Method used

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  • Catalyst for catalytic oxidation of formaldehyde pollutant at room temperature, preparation method and application thereof
  • Catalyst for catalytic oxidation of formaldehyde pollutant at room temperature, preparation method and application thereof
  • Catalyst for catalytic oxidation of formaldehyde pollutant at room temperature, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] Preparation and testing of honeycomb catalyst: Mix the ground catalyst powder with water at a solid-to-liquid ratio of 30% to prepare a slurry; then coat it on a honeycomb cordierite carrier and dry and roast it After that, the honeycomb catalyst sample was prepared; the figure 1 The U-shaped reaction tube in the device is replaced by a straight tube, and the catalyst of 1in*1in (inch, about 25.4mm) is loaded into the straight tube with an inner diameter of 30mm. The loading diagram of the catalyst is as follows figure 2 As shown, the straight tube was placed in a water bath with a constant temperature of 25°C. A certain concentration of formaldehyde is passed into the inlet of the straight pipe, and the outlet gas is analyzed online by a special formaldehyde analyzer.

[0044] Catalyst activity evaluation experimental conditions are as follows: under room temperature conditions, volume composition (volume ratio): oxygen: 20%, nitrogen: 80%, relative humidity RH is 0...

Embodiment 1

[0045] Embodiment 1: the preparation method of aluminum oxide monohydrate (AlOOH)

[0046] First make your own or buy commercial Al(OH) 3 . Laboratory-made Al(OH) 3 There are two main methods: the reaction of soluble aluminum salts with ammonia water, and the reaction of sodium metaaluminate with excess carbon dioxide.

[0047] Preparation of Al(OH) by Reaction of Soluble Aluminum Salt and Ammonia 3 The steps are: measure 10ml of AlCl with a concentration of 1mol / L 3 Solution, under the condition of stirring, dilute ammonia water with a concentration of 0.5mol / L was added dropwise to it, and the dropping time was controlled at more than 2h until no precipitation appeared, and then the obtained precipitation was washed with deionized water and ethanol respectively. Centrifuge and wash 3 times, then dry it to get Al(OH) 3 .

[0048] Preparation of Al(OH) by Reacting Sodium Metaaluminate with Excess Carbon Dioxide 3 The steps are: weigh 5.0g of sodium metaaluminate solid, ...

Embodiment 2

[0050] Embodiment 2: Preparation of 1Pt(N) / AlOOH catalyst and its activity test

[0051] Use a pipette to measure 2ml of Pt(NO 3 ) 2 (10g Pt / L, the same below) is placed in a 50ml beaker; add a stirring rotor to it, put it on the stirrer and stir, add an appropriate amount of deionized water, and add 2.0g of AlOOH prepared by roasting at 300°C in Example 1 to the beaker Carrier; stir at room temperature for 12 hours to distribute the active components evenly; after stirring, heat the two samples to 70°C and continue stirring until viscous (paste); put the samples in a drying oven for drying (110°C, 12h); after drying, the sample was taken out, and after cooling to room temperature, it was ground into a powder; the sample was placed in a crucible and baked in a muffle furnace (300°C, 3h); After the burning is completed, after the temperature in the muffle furnace is cooled to room temperature, the sample is pressed into tablets and sieved into 40-60 meshes for reduction.

[...

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Abstract

Provided are a catalyst for room-temperature catalytic oxidation of formaldehyde pollutants and a preparation method and application thereof. Alumina monohydrate (AlOOH) is used as a carrier, precious metals Pt and Pd are supported on the AlOOH by adopting an impregnation method and the like, and the catalyst capable of conducting efficient catalytic oxidation on formaldehyde in the polluted air under normal pressure and room temperature into harmless carbon dioxide and water is obtained. The AlOOH carrier is prepared through direct calcination of aluminum hydroxide, and its preparation process is simple and repeatable, the surface area is larger, and lots of hydroxyl groups are produced. Nitrate is used as a precursor solution, the prepared Pt / AlOOH or Pd / AlOOH catalyst has higher dispersion degree of precious metals, and thus a more excellent room-temperature formaldehyde purification effect is obtained. Experimental tests show that the formaldehyde concentration is 80ppm in the air with the relative humidity RH of 0-80%, and the formaldehyde conversion rate of catalytic oxidation of the catalyst can be kept to 100% for a long time.

Description

technical field [0001] The invention belongs to the technical field of catalysts and environmental protection, and in particular relates to a room-temperature catalytic oxidation catalyst for formaldehyde, an indoor pollutant, and a preparation method and application thereof. Background technique [0002] In recent years, formaldehyde poisoning incidents have occurred frequently. In 2014, the formaldehyde poisoning incident in the dormitory of Zhejiang Normal University, and the collective formaldehyde poisoning in Bao Kindergarten in Nanchang, Jiangxi; Symptoms such as nausea, high fever, and bronchial inflammation appeared one after another. The reason was that the formaldehyde in the newly built kindergarten exceeded the standard. Currently, formaldehyde has been identified as a possible carcinogen by the U.S. Environmental Protection Agency (EPA) and as a Class 1 carcinogen by the International Agency for Research on Cancer (IARC) under the World Health Organization. F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J23/42B01D53/86B01D53/72
CPCB01D53/8668B01D2257/708B01J23/42B01J23/44
Inventor 郭燏李清陈飞王峰曹财源刘怡赵阳孙路
Owner 江苏博斯纳环境科技有限公司
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