Copper-iridium composite oxide catalyst for preparing methanol by methane oxidation

A technology of composite oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, oxidation reaction preparation, etc., can solve the problems of poor catalyst activity and poor stability of active sites, etc. Achieve the effects of convenient operation, simple use conditions and high catalytic stability

Active Publication Date: 2019-07-23
SUN YAT SEN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] Aiming at the problems faced by the heterogeneous reaction system of the direct oxidation of methane to methanol, the purpose of the present invention is to solve the problems of poor activity and poor stability of active sites of traditional catalysts, and to provide a copper-iridium composite catalyst for the oxidation of methane to methanol. Oxide catalyst and its preparation method and application

Method used

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  • Copper-iridium composite oxide catalyst for preparing methanol by methane oxidation

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Embodiment 1

[0018] A kind of copper-iridium composite oxide catalyst that is used for methane oxidation to methanol, described catalyst is made of CuO and IrO 2 composition. The weight percentage of iridium is 1% based on 100% by mass of the catalyst. First, a certain concentration of copper acetate solution and sodium hydroxide solution were mixed, and then hydrothermally treated at 100 °C for 30 min to obtain a black CuO precipitate, which was centrifuged, washed, and dried to obtain CuO powder. Then use the equal volume impregnation method to impregnate the solution containing the required amount of chloroiridic acid onto the carrier CuO overnight, then dry it at 80 °C, and finally treat it under a nitrogen atmosphere at 500 °C for 4 hours to obtain a copper-iridium composite oxide catalyst.

Embodiment 2

[0020] A kind of copper-iridium composite oxide catalyst that is used for methane oxidation to methanol, described catalyst is made of CuO and IrO 2 composition. The catalyst is based on 100% by mass, and the weight percentage of iridium is 3%. Firstly, Cu-BTC was prepared, and then it was calcined in air at 500°C for 3 hours to obtain CuO support. Afterwards, the equal volume impregnation method was used to impregnate the solution containing the required amount of chloroiridic acid on the carrier CuO overnight, and then 80 o C drying, and finally calcined in an air atmosphere at 700 °C for 3 hours to prepare a copper-iridium composite oxide catalyst for methane oxidation to methanol.

Embodiment 3

[0022] A kind of copper-iridium composite oxide catalyst that is used for methane oxidation to methanol, described catalyst is made of CuO, ZnO and IrO 2 composition. Based on the weight of the catalyst being 100%, the weight percentage of iridium is 2.0%, and the weight percentage of ZnO is 10%. Cu-BTC was prepared first, and then it was calcined at 500 °C in air for 3 hours to obtain CuO support. Co-impregnate the required amount of chloroiridic acid solution and zinc acetate solution on the carrier CuO carrier overnight, then dry it at 100 °C, and finally bake it in an air atmosphere at 600 °C for 6 hours to prepare methanol for methane oxidation. Zinc-doped copper-iridium composite oxide catalyst.

[0023] Take 10 mg of the catalysts described in Examples 1-3 respectively, and place them in a high-pressure reactor (with a lining volume of 100 mL) for experimentation. The experimental conditions are as follows: 30 mL of water was added to the reactor, the methane pressur...

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Abstract

The invention discloses a copper-iridium composite oxide catalyst for preparing methanol by direct methane oxidation and a preparation method thereof, belonging to the technical field of preparing themethanol by methane oxidation. The catalyst consists of an iridium oxide, a copper oxide and a cocatalyst of a zinc oxide, a cobalt oxide or an iron oxide. The weight percentage of noble metal iridium is 0.1-10.0% and the weight percentage of the cocatalyst MOX is 0-20.0% based on the weight percentage of the catalyst of 100%. Compared with other copper-based catalysts use for preparing the methanol by methane oxidation, the copper-iridium composite oxide catalyst has the characteristics of simple preparation method, high methanol yield and repeated recycle in the reaction of preparing the methanol by methane oxidation.

Description

technical field [0001] The invention relates to the technical field of methane oxidation to methanol, in particular to a copper-iridium composite oxide catalyst for methane oxidation to methanol, its preparation method and application. Background technique [0002] my country's natural gas resources are generally relatively rich, but the distribution of gas fields is scattered and cannot be effectively utilized due to geographic location or economic factors; oil-associated gas obtained from oil extraction is also mostly unable to be converted into effective production capacity due to the limitation of mining areas. Methanol is a liquid organic chemical raw material at room temperature and a core product of C1 chemistry, and is considered an ideal product for methane conversion. Therefore, according to the characteristics of remote inland and offshore natural gas fields and petroleum-associated gas, the development of methane direct catalytic oxidation to methanol technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C29/50C07C31/04
CPCB01J23/002B01J23/8953B01J23/8926C07C29/50B01J2523/00B01J2523/17B01J2523/27B01J2523/827C07C31/04Y02P20/52
Inventor 芮泽宝王锦栩杨乐
Owner SUN YAT SEN UNIV
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