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CN-121988330-A - Catalyst for preparing synthesis gas by using solar-driven carbon dioxide/water, preparation method and application thereof

CN121988330ACN 121988330 ACN121988330 ACN 121988330ACN-121988330-A

Abstract

The invention belongs to the technical field of catalyst preparation, and particularly relates to a catalyst for preparing synthesis gas by using solar energy to drive carbon dioxide/water, a preparation method and application thereof. A solar-driven carbon dioxide/water synthesis gas catalyst, which is a composite metal oxide containing metal elements Fe, co, ni, ce and Zn. The invention develops a non-noble metal catalyst with high activity and stability, takes solar energy as the only input energy, efficiently converts CO 2 /H 2 O into synthesis gas under mild conditions, and shows high synthesis gas selectivity and good catalyst reusability.

Inventors

  • XIA QINENG
  • QIN SHENGXU
  • PAN HU
  • JI MIMI

Assignees

  • 嘉兴大学

Dates

Publication Date
20260508
Application Date
20260327

Claims (10)

  1. 1. The catalyst for preparing the synthesis gas by using the solar-driven carbon dioxide/water is characterized by being a composite metal oxide containing metal elements Fe, co, ni, ce and Zn.
  2. 2. The solar-driven carbon dioxide/water synthesis gas catalyst according to claim 1, wherein the molar ratio of the metal element Fe, co, ni, ce to Zn is 1:1:1:1.
  3. 3. The solar-driven carbon dioxide/water synthesis gas catalyst according to claim 1, wherein the micro-morphology of the catalyst is spherical nanoparticles with mesoporous structure.
  4. 4. The solar-driven carbon dioxide/water synthesis gas catalyst according to claim 2, wherein the catalyst has a forbidden bandwidth of 1.19 eV.
  5. 5. A method of preparing a solar-driven carbon dioxide/water synthesis gas catalyst according to any one of claims 1 to 4, comprising the steps of: dissolving a metal source containing Fe, co, ni, ce and Zn in an organic solvent, and stirring until the metal source is completely dissolved to obtain a precursor solution; Transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal crystallization reaction; after the reaction is finished, carrying out solid-liquid separation on the obtained mixture, collecting a solid product and washing by using a detergent; And step four, drying and grinding the washed solid product to obtain the catalyst.
  6. 6. The method according to claim 5, wherein in the first step, the metal sources containing Fe, co, ni, ce and Zn are iron acetylacetonate, cobalt acetylacetonate, nickel acetylacetonate, cerium acetylacetonate and zinc acetylacetonate, respectively, and the organic solvent is a mixed solvent of ethanol and acetone.
  7. 7. The method according to claim 5, wherein in the second step, the hydrothermal crystallization reaction is performed at a temperature of 180 ℃ to 200 ℃ and the crystallization time is 20 h to 24 h.
  8. 8. The preparation method according to claim 5, wherein in the third step, the detergent is absolute ethyl alcohol and water, and in the fourth step, the drying temperature is 60-70 ℃ and the drying time is 12 h.
  9. 9. Use of a solar-driven carbon dioxide/water synthesis gas catalyst according to any one of claims 1 to 4 for the preparation of synthesis gas from solar-driven CO 2 /H 2 O.
  10. 10. The use according to claim 9, wherein the process of the use comprises mixing the catalyst with water and placing in a CO 2 atmosphere, performing a catalytic reaction under simulated sunlight or under sunlight illumination conditions.

Description

Catalyst for preparing synthesis gas by using solar-driven carbon dioxide/water, preparation method and application thereof Technical Field The invention belongs to the technical field of catalyst preparation, and particularly relates to a catalyst for preparing synthesis gas by using solar energy to drive carbon dioxide/water, a preparation method and application thereof. Background Under the dual pressures of global climate warming and energy structure transformation, the recycling of greenhouse gases has become one of the core paths for achieving the dual carbon targets. The greenhouse gases are directionally converted into high-added-value chemicals such as methanol, synthesis gas (mixed gas of CO and H 2), C2+ hydrocarbons and the like, so that the carbon emission reduction and the carbon increment can be realized. Wherein, water (H 2 O) is used as the most abundant compound on earth, and hydrogen (H) and oxygen (O) elements in the molecule can be used as green reactants to participate in the catalytic conversion process without additionally introducing toxic oxidant or reducer. Conventional thermocatalytic techniques are widely used in industry, for example, to produce synthesis gas by steam reforming of methane with H 2 O, but the process has inherent disadvantages in that the reaction is typically carried out at high temperatures of 700-1100 ℃ and high pressures of 14-20 atm, with high energy consumption (35% -50% of the total cost of the reaction). In contrast, the photocatalysis technology takes solar energy as driving energy, can realize selective breaking and recombination of chemical bonds under the isothermal and condition of normal temperature and normal pressure, and fundamentally solves the problem of high energy consumption of traditional thermal catalysis. However, in the process of driving CO 2/H2 O to prepare synthesis gas, the conventional photocatalyst at present commonly has technical bottlenecks of narrow sunlight absorption range, high photo-generated electron-hole recombination rate, low catalytic yield, poor product selectivity (easy generation of methane, formic acid and other byproducts) and the like. In recent years, the high-entropy material is used as an emerging catalytic material, has rich oxygen vacancies and adjustable electronic structures through the synergistic effect of various metal cations, and provides a new idea for solving the photocatalytic bottleneck. However, how to screen out specific multi-metal combinations and develop a simple preparation process to achieve high synthesis gas yield and selectivity in photocatalytic CO 2 reduction remains a technical challenge to be solved in the art. Disclosure of Invention The invention aims to provide a catalyst for preparing synthesis gas by using solar energy to drive carbon dioxide/water, which has the advantages of simple preparation method, low cost and easy obtainment of raw materials, and the prepared catalyst shows high activity of synthesis gas under the irradiation reaction of simulated sunlight, and meanwhile, the maximum ratio of the synthesis gas is 99.26 percent through regulation and control. The technical scheme adopted for solving the technical problems is as follows: A solar-driven carbon dioxide/water synthesis gas catalyst, which is a composite metal oxide containing metal elements Fe, co, ni, ce and Zn. The invention develops a non-noble metal catalyst with high activity and stability, takes solar energy as the only input energy, efficiently converts CO 2/H2 O into synthesis gas under mild conditions, and shows high synthesis gas selectivity and good catalyst reusability. Preferably, the molar ratio of the metal element Fe, co, ni, ce to Zn is 0.5-2.0:0.5-2.0:0.5-2.0:0.5-2.0:0.5-2.0. The molar ratio is preferably 0.8-1.2:0.8-1.2:0.8-1.2:0.8-1.2:0.8-1.2. Optimally, the molar ratio of the metal element Fe, co, ni, ce to Zn is 1:1:1:1. Preferably, the micro morphology of the catalyst is spherical nano particles with mesoporous structure. Preferably, the forbidden bandwidth of the catalyst is 1.19 eV. The preparation method of the catalyst for preparing synthesis gas by using solar energy to drive carbon dioxide/water comprises the following steps: dissolving a metal source containing Fe, co, ni, ce and Zn in an organic solvent, and stirring until the metal source is completely dissolved to obtain a precursor solution; Transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal crystallization reaction; after the reaction is finished, carrying out solid-liquid separation on the obtained mixture, collecting a solid product and washing by using a detergent; And step four, drying and grinding the washed solid product to obtain the catalyst. Preferably, in the first step, the metal sources containing Fe, co, ni, ce and Zn are iron acetylacetonate, cobalt acetylacetonate, nickel acetylacetonate, cerium acetylacetonate and zinc acetylacetonate, respectively, and the organic solven