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Catalyst as well as preparation method and application thereof

A catalyst and co-catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of incomplete catalytic oxidation of formaldehyde, poor stability, low oxidation activity, etc., and achieve inhibition of self-poisoning effect, Enhanced stability and large stacking voids

Active Publication Date: 2022-02-11
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most developed catalysts target a single specific pollutant but show low oxidation activity for other pollutants
[0003] At present, the methods for removing formaldehyde and carbon monoxide mainly include the following: (1) Adsorption method: Adsorption method is the most common technology for eliminating harmful gases such as formaldehyde and carbon monoxide , using potassium permanganate, activated carbon, alumina, and some ceramic materials as adsorbents to remove formaldehyde and carbon monoxide have been widely studied, but the adsorption method has the following problems: the effectiveness of the adsorbent is usually limited by the low adsorption capacity
However, this series of catalysts currently has the following disadvantages: (1) The temperature required to completely catalyze carbon monoxide is relatively high; (2) The catalyst is rapidly deactivated under humid conditions
The noble metal catalysts in the literature have problems such as poor moisture resistance and poor stability, and the non-noble metal catalysts cannot completely catalyze the oxidation of formaldehyde at room temperature, and no further research has been carried out on the catalytic oxidation of formaldehyde at different concentrations.

Method used

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  • Catalyst as well as preparation method and application thereof
  • Catalyst as well as preparation method and application thereof
  • Catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a catalyst, which includes a spherical alumina carrier, cerium oxide supported on the alumina carrier, a platinum active component supported on the surface of the cerium oxide, and a carbon additive supported on the surface of the platinum active component;

[0049] Among them, the maximum major diameter of the alumina carrier is 4 mm, the mass ratio of cerium oxide to alumina carrier is 20:100, the mass ratio of platinum to alumina carrier is 0.2:100, and the mass ratio of carbon additive to alumina carrier is 0.02:100.

[0050] The preparation method of described catalyst is as follows:

[0051] (1) Load cerium nitrate on a 4mm long-diameter alumina support by impregnation method, dry at 80°C overnight and then bake at 450°C for 2h to obtain 20% CeO 2 / Al 2 o 3 , and then Pt was supported on CeO by the impregnation method 2 surface, dried overnight at 80°C, and then calcined at 450°C for 2 hours to obtain a catalyst precursor;

[0052] (2...

Embodiment 2

[0055] This embodiment provides a catalyst, which comprises a spherical alumina carrier, cerium oxide loaded on the alumina carrier, a palladium active component loaded on the surface of the cerium oxide, and a carbon additive loaded on the surface of the palladium active component;

[0056] Wherein, the maximum long diameter of alumina carrier is 10mm, the mass ratio of cerium oxide and alumina carrier is 30:100, the mass ratio of palladium and alumina carrier is 0.5:100, the mass ratio of carbon additive and alumina carrier is 0.05:100.

[0057] The preparation method of described catalyst is as follows:

[0058] (1) Load cerium nitrate on a 10mm-long-diameter alumina support by impregnation method, dry at 80°C overnight, and then bake at 450°C for 2 hours to obtain 30% CeO 2 / Al 2 o 3 , and then palladium was supported on CeO by the impregnation method 2 surface, dried overnight at 80°C, and then calcined at 450°C for 2 hours to obtain a catalyst precursor;

[0059] (2...

Embodiment 3

[0061] This embodiment provides a catalyst, which includes a spherical alumina carrier, cerium oxide supported on the alumina carrier, a platinum active component supported on the surface of the cerium oxide, and a carbon additive supported on the surface of the platinum active component;

[0062] Among them, the maximum long diameter of the alumina carrier is 4 mm, the mass ratio of cerium oxide to alumina carrier is 10:100, the mass ratio of platinum to alumina carrier is 0.8:100, and the mass ratio of carbon additive to alumina carrier is 0.005:100.

[0063] The preparation method of described catalyst is as follows:

[0064] (1) Load cerium nitrate on an alumina carrier with a long diameter of 4mm by impregnation method, dry at 80°C overnight and then bake at 450°C for 2h to obtain 10% CeO 2 / Al 2 o 3 , and then Pt was supported on CeO by the impregnation method 2 surface, dried overnight at 80°C, and then calcined at 450°C for 2 hours to obtain a catalyst precursor; ...

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Abstract

The invention provides a catalyst as well as a preparation method and application thereof. The catalyst comprises a structure carrier, a co-catalyst loaded on the structure carrier, a noble metal active component loaded on the surface of the co-catalyst, and a carbon assistant loaded on the surface of the noble metal active component. According to the catalyst provided by the invention, the noble metal can be modified by adding a carbon additive, and the self-poisoning effect in the CO and formaldehyde oxidation process is inhibited, so the stability of the catalyst is enhanced, and the technical effect of simultaneously removing formaldehyde and carbon monoxide at room temperature is realized.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a catalyst and its preparation method and application. Background technique [0002] Both formaldehyde and carbon monoxide are potential indoor air pollutants. Formaldehyde is usually released by various building and decoration materials, while indoor carbon monoxide is usually produced by incomplete combustion in daily life (such as cooking and heating). These two pollutants may coexist in some specific spaces and cause damage to human health. Therefore, people have been devoting themselves to the development of efficient means to remove formaldehyde and carbon monoxide that coexist indoors. Among the methods that have been developed, the most promising are catalytic oxidations with high activity at room temperature and no energy input. The core of this method is an efficient oxidation catalyst, including supported noble metal and non-noble metal oxides. Most of the catalysts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/86B01D53/72B01D53/62
CPCB01J23/63B01D53/864B01D53/8668Y02A50/20
Inventor 张长斌张江浩
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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