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Preparation of supported platinum group metal monatomic catalyst, and applications of supported platinum group metal monatomic catalyst in deoxidation reaction

A platinum group metal and catalyst technology, which is applied in the field of preparation of supported platinum group metal single-atom catalysts, can solve problems such as unsuccessful application, and achieve the effects of high utilization rate, good deoxidation depth and high intrinsic activity

Pending Publication Date: 2020-06-02
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

[0006] At present, single-atom catalysts have shown high activity in a series of reactions such as water-gas shift (CN201610586356) and hydroformylation (CN2016104878090), but there are no reports on their successful application in hydrogen catalytic deoxygenation reactions.

Method used

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  • Preparation of supported platinum group metal monatomic catalyst, and applications of supported platinum group metal monatomic catalyst in deoxidation reaction
  • Preparation of supported platinum group metal monatomic catalyst, and applications of supported platinum group metal monatomic catalyst in deoxidation reaction
  • Preparation of supported platinum group metal monatomic catalyst, and applications of supported platinum group metal monatomic catalyst in deoxidation reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 3.0mg PdCl 2 Dissolve completely in 15 mL of deionized water with vigorous stirring. Pour 5g of spherical alumina carrier into the precursor solution. After the carrier is saturated, heat it at 80°C until the water is completely volatilized while stirring continuously. The obtained Pd-adsorbed alumina carrier was dried in an oven at 80° C. for 10 h, and then taken out. Reduction with hydrogen at 50 °C for 30 min. After natural cooling, the sample was taken out to obtain a spherical alumina-supported 0.036wt% monoatomic palladium catalyst. The 0.036wt% monoatomic palladium catalyst of 1.5g spherical alumina loading is packed in the reaction tube, open feed gas, O 2 Content: 0.3vol%; H 2 Content: 99.7vol%; Adjust volume space velocity: 7000h -1 . Set the reaction temperature as room temperature, the reaction pressure as normal pressure, and the oxygen concentration in the tail gas as 0.05ppm.

Embodiment 2

[0039] 5.5mg Pd(NO 3 ) 2 Dissolve completely in 10 mL of deionized water with vigorous stirring. Pour 5g of manganese oxide powder carrier into the precursor solution. After the carrier is saturated, heat it at 70°C until the water is completely volatilized while stirring continuously. The obtained Pd-adsorbed manganese oxide support was dried in an oven at 150° C. for 2 h, and then taken out. Reduction with hydrogen at 20°C for 10 min. After natural cooling, the sample was taken out to obtain a catalyst in which 0.051wt%>50% of Pd supported on manganese oxide existed in the form of single atoms. The 0.051wt%>50% Pd that 2.0g manganese oxide load is present is packed in the reaction tube with the catalyst of monoatomic form, open feed gas, O 2 Content: 0.1vol%; H 2 Content: 99.9vol%; Adjust volume space velocity: 4500h -1 . Set the reaction temperature at 80° C., the reaction pressure at 1.5 MPa, and the oxygen concentration in the tail gas at 0.53 ppm.

Embodiment 3

[0041] 11.0mg Pd(OAc) 2 Dissolve completely in 5 mL of deionized water with vigorous stirring. Pour 5g of molecular sieve powder carrier into the precursor solution. After the carrier is saturated, heat it at 80°C until the water is completely volatilized while stirring continuously. The obtained Pd-adsorbed molecular sieve carrier was dried in an oven at 300° C. for 4 h, and then taken out. Reduction with hydrogen at 80°C for 20 min. After natural cooling, the sample is taken out to obtain a catalyst in which 0.10wt%>50% of Pd supported by molecular sieves exists in the form of single atoms. The 0.10wt%>50% Pd that 1.5g molecular sieve load exists is packed in the reaction tube with the catalyst of monatomic form, open feed gas, O 2 Content: 5vol%; H 2 Content: 50vol%; balance gas is helium; volumetric space velocity adjustment: 15000h -1 . Set the reaction temperature at 300° C., the reaction pressure at 0.5 MPa, and the oxygen concentration in the tail gas at 0.08 ppm...

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Abstract

The invention relates to preparation of a supported platinum group metal monatomic catalyst, and applications of the supported platinum group metal monatomic catalyst in a deoxidation reaction, wherein the platinum group metal component is one or more than two selected from palladium (Pd), platinum (Pt), ruthenium (Ru), rhodium (Rh) and iridium (Ir), the carrier is one or more than two selected from aluminum oxide, manganese oxide, copper oxide, iron oxide, titanium oxide, zirconium oxide, cerium oxide, silicon oxide, diatomite and a molecular sieve, the active metal is highly dispersed on thecarrier mainly in the form of single atoms, and the content of the active metal accounts for 0.001-2% of the total mass of the catalyst. The catalyst is high in oxygen removal reaction activity in hydrogen, wherein the deoxidation purification depth can reach less than 1 ppm. The catalyst prepared by the method has the remarkable advantages of high metal atom utilization rate, good intrinsic activity of a metal active center and the like, and has a good application prospect.

Description

technical field [0001] The invention relates to the preparation of a supported platinum group metal single-atom catalyst and its application in deoxidation reaction. Background technique [0002] Oxygen is one of the main components of the atmosphere. Some industrial raw materials are inevitably mixed with different amounts of oxygen, so under some working conditions, the raw materials need to remove oxygen before use. In addition, some processes will produce oxygen, so the exhaust gas often contains oxygen, which needs to be removed before further treatment or utilization. Therefore, the deoxygenation reaction is currently widely used in industrial processes. [0003] The deoxidation process of mixed gas mainly includes physical method and chemical method. Physical methods such as adsorption and chemical methods such as combustion and reduction. The reduction method mainly includes two types: the first type is chemical absorption deoxidation, which means that under the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/56B01J23/656B01J23/89B01J23/63
CPCB01J23/56B01J23/6562B01J23/8906B01J23/63
Inventor 乔波涛郎睿郑明远王爱琴张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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