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A kind of cuo/zro2 water gas shift catalyst and preparation method thereof

A technology for transforming catalysts and water gas, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problem of uneven distribution of CuO particles on the surface of catalysts and the inability of CuO Catalysis, difficult to maintain thermal stability and other problems, to achieve excellent catalytic performance, improve thermal stability and water resistance, and broad industrial application prospects

Inactive Publication Date: 2015-12-02
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above preparation methods all have shortcomings: (1) CuO / ZrO prepared by precipitation method 2 ZrO exists in the catalyst 2 The embedding of active CuO particles makes some CuO unable to play a catalytic role. In addition, the catalyst prepared by this method is prone to hard agglomeration during the roasting process, resulting in the growth of particle size, which is not conducive to the occurrence of catalytic reactions.
(2) CuO / ZrO prepared by impregnation method 2 The CuO particles on the surface of the catalyst are often distributed unevenly, and high-temperature roasting can easily cause the sintering and growth of the CuO particles on the surface, which is also not conducive to the progress of the catalytic reaction.
(3) Preparation of CuO / ZrO by deposition precipitation method 2 Although the CuO particles on the surface of the catalyst are uniformly distributed, CuO and ZrO 2 The interaction between them is often weak, and it is difficult to maintain good thermal stability during the catalytic reaction.
In addition, the preparation method of this method is cumbersome, and it is necessary to prepare ZrO 2 The carrier is then loaded with CuO, and there are unfavorable factors such as secondary washing and secondary roasting in the preparation process.

Method used

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  • A kind of cuo/zro2 water gas shift catalyst and preparation method thereof
  • A kind of cuo/zro2 water gas shift catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 0.877gCuCl 2 2H 2 O, 15.081g ZrOCl 2 ·8H 2 O and 3.120g urea were dispersed in 65mL deionized water to prepare a mixed solution [ie n(Cu):n(Zr)=1:9, n(Cu+Zr):n(urea)=1:1]. The above mixed solution was transferred into a hydrothermal reaction kettle with a volume of 100 mL, the hydrothermal temperature was controlled at 210° C., and the hydrothermal time was 3 hours. The hydrothermal product was washed to remove impurity ions, dried at 120°C for 8 hours, and then calcined at 500°C for 4 hours to obtain CuO / ZrO 2 Water gas shift catalyst.

Embodiment 2

[0019] 3.769gCu(NO 3 ) 2 ·3H 2 O, 11.730gZrOCl 2 ·8H 2 O and 3.744g urea were dispersed in 65mL deionized water to prepare a mixed solution [ie n(Cu):n(Zr)=3:7, n(Cu+Zr):n(urea)=1:1.5]. The above mixed solution was transferred into a hydrothermal reaction kettle with a volume of 100 mL, and the hydrothermal temperature was controlled at 180° C., and the hydrothermal time was 6 hours. The hydrothermal product was washed to remove impurity ions, dried at 120°C for 8 hours, and then calcined at 400°C for 4 hours to obtain CuO / ZrO 2 Water gas shift catalyst. figure 1 It is CuO / ZrO in Example 2 2 X-ray diffraction pattern of a water gas shift catalyst. Depend on figure 1 It can be known that CuO / ZrO in Example 2 2 ZrO in Water Gas Shift Catalyst 2 At the same time, it has two crystal phases of tetragonal phase and monoclinic phase. And no diffraction peak of crystalline CuO was found, indicating that CuO exists in a highly dispersed state or has been mixed with ZrO 2 Th...

Embodiment 3

[0021] 5.191gCu(Ac) 2 2H 2 O, 11.162gZr(NO 3 ) 4 ·5H 2 O and 4.68g urea were dispersed in 65mL deionized water to prepare a mixed solution [ie n(Cu):n(Zr)=5:5, n(Cu+Zr):n(urea)=1:2]. The above mixed solution was transferred into a hydrothermal reaction kettle with a volume of 100 mL, and the hydrothermal temperature was controlled at 150° C., and the hydrothermal time was 24 hours. The hydrothermal product was washed to remove impurity ions, dried at 120°C for 8 hours, and then calcined at 300°C for 4 hours to obtain CuO / ZrO 2 Water gas shift catalyst.

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Abstract

The invention discloses a CuO / ZrO2 water-gas shift catalyst and a preparation method thereof, belonging to the technical fields of water-gas shift processes and catalysts. The preparation method of the CuO / ZrO2 water-gas shift catalyst comprises the following steps: firstly, dissolving copper salt, zirconium salt and urea into water to form mixed liquor; then, carrying out hydro-thermal treatment onto the mixed liquor; and washing, drying and roasting hydro-thermal products to prepare the CuO / ZrO2 water-gas shift catalyst. The preparation method disclosed by the invention is simple, convenient and easy to implement, and the prepared CuO / ZrO2 water-gas shift catalyst has advantages of being low in activating temperature, high in activity, wide in active temperature zone, high in selectivity and good in thermal stability, and is especially suitable for a hydrogen-rich reaction gas operation environment.

Description

technical field [0001] The invention belongs to the field of water gas shift technology and catalyst technology, in particular to a CuO / ZrO 2 Water gas shift catalyst and preparation method thereof. Background technique [0002] Water-Gas-Shift Reaction (Water-Gas-ShiftReaction, CO+H 2 O→CO+H 2 ) is an extremely important reaction process in the chemical industry, and is widely used in the ammonia synthesis industry and hydrogen production industry using coal, oil and natural gas as raw materials. In recent years, with the development of vehicle-mounted proton exchange membrane fuel cell (PEMFC) technology, the water-gas shift reaction, as an important link in the PEMFC online hydrogen production system, has once again attracted widespread attention. At present, shift catalysts commonly used in industry mainly include iron-chromium-based high-temperature shift catalysts, copper-zinc-based low-temperature shift catalysts, and cobalt-molybdenum-based wide-temperature sulfur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72
CPCY02P20/52
Inventor 郑起张燕杰陈崇启詹瑛瑛林性贻
Owner FUZHOU UNIV
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