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Application of platinum-based catalyst for low-temperature CO oxidation or ADN decomposition

A catalyst and catalytic decomposition technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve the problems of incomplete oxidation and poor room temperature activity, and achieve Excellent low temperature catalytic oxidation performance, good low temperature activity, good activity effect

Active Publication Date: 2020-11-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, Newton et al. (Nat.Commun.2015,6:8675-9675; J.Am.Chem.Soc.2016,138:13930-13940) found that commercial 5%Pt / Al 2 o 3 The catalyst adsorbs CO and O 2 When Pt carbonate is formed, it has low-temperature CO oxidation activity, but the overall room temperature activity is poor, and a higher temperature carbonate is required to completely decompose
It can be seen that no matter whether Pt is modified by adding alkali metals or transition metals, or the support is modified by electronic regulation and doping, the complete oxidation of CO at room temperature or even at ultra-low temperature cannot be achieved on a single Pt catalyst supported by an inert support.

Method used

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  • Application of platinum-based catalyst for low-temperature CO oxidation or ADN decomposition
  • Application of platinum-based catalyst for low-temperature CO oxidation or ADN decomposition
  • Application of platinum-based catalyst for low-temperature CO oxidation or ADN decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dissolve 1g of chloroplatinic acid in 50ml of ethylene glycol solution, add it to a three-necked flask under the protection of Ar gas, and add NaOH (50ml, 0.5M) to the alcohol solution of chloroplatinic acid (1g), stir to obtain a transparent yellow Pt colloid solution, and then heated to 140 ° C for 3 hours, and the water and organic by-products in the system were taken away by Ar gas and condensed reflux. A dark brown, uniform colloidal solution of Pt clusters with a size of 0.5-1.3 nm was obtained, and the concentration of Pt in the sol was 3.7 mg / ml.

Embodiment 2

[0038] The difference from Example 1 is that the added NaOH is (50ml, 0.3M), other conditions and materials are the same as in Example 1, and the obtained Pt cluster sol has a size of 2.7±0.6nm. The test conditions of the catalyst for low-temperature CO oxidation are the same as in Example 15.

Embodiment 3

[0040] The difference from Example 1 is that the heating temperature is 160° C., the mass of chloroplatinic acid is 0.27 g, other conditions and materials are the same as in Example 1, and the obtained Pt cluster sol has a size of 0.5±0.3 nm.

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Abstract

The invention relates to an alumina-supported platinum (Pt) catalyst and a preparation method and application thereof. The catalyst is specifically a composite catalyst with a single component Pt as an active center and inert alumina as a carrier, wherein the platinum accounts for 0.5 to 5% of the total mass of the catalyst, and is highly dispersed on the alumina in a form of clusters with a cluster size of 0.5 to 3.0 nm. The catalyst is used in oxidation elimination of carbon monoxide (CO) in an ultra-low temperature environment (-80 to 0 DEG C), and purification of a hydrogen source used ina proton exchange membrane fuel cell power generation system. In particular, the catalyst is also suitable for catalytic decomposition of ammonium dinitramide (ADN) at low temperature. The catalyst has characteristics of simple preparation method, high selectivity and high stability, and has good industrial application prospect.

Description

technical field [0001] The invention relates to a platinum cluster catalyst supported by alumina and its preparation and application. Platinum is highly dispersed on alumina in the form of 0.5-3.0nm clusters, and is used as the only active center in the oxidation and oxidation of ultra-low temperature carbon monoxide (CO). The selective elimination of trace amounts of CO in hydrogen sources exhibits high catalytic performance. The catalyst realizes the decomposition of ammonium dinitramide (ADN) at low temperature. Background technique [0002] CO oxidation is one of the most important and widely studied catalytic processes. CO has a wide range of sources, high toxicity, and a wide explosion limit (12.5% ​​to 74%). Therefore, in environmental protection, CO 2 Lasers, CO gas gas masks, industrial applications, CO elimination in confined spaces, and new energy development (fuel cell technology) have very important application values. This reaction is particularly important ...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J37/03B01D53/94B01D53/62C06D5/04
CPCB01J23/42B01J37/036B01D53/94B01D53/62C06D5/04B01D2257/502Y02A50/20Y02E60/50
Inventor 王晓东陈洋林坚吕飞夏连根张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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