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Preparation and application methods of Cu-Ni-based catalyst for reversed water gas reaction

A technology of reverse water gas and catalyst, which is applied in the field of preparation of Cu-Ni-based catalysts, can solve problems such as difficulty in regulation, and achieve the effects of low preparation cost, high activity, and good application prospects

Active Publication Date: 2019-03-22
ZHEJIANG UNIV
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  • Description
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Problems solved by technology

TiO in the rutile phase through Ir 2 It shows that the epitaxial growth of the pair has higher reactivity and stability, but its selectivity changes significantly with the loading of Ir, which is difficult to control

Method used

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  • Preparation and application methods of Cu-Ni-based catalyst for reversed water gas reaction
  • Preparation and application methods of Cu-Ni-based catalyst for reversed water gas reaction
  • Preparation and application methods of Cu-Ni-based catalyst for reversed water gas reaction

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preparation example Construction

[0032] Among them, through the control of the preparation conditions and reaction conditions of the catalyst, as well as the optimization of a number of experimental parameters, the structure and catalytic performance of CuNi-NMs catalysts with high activity and 100% selectivity for CO production can be realized.

[0033] When the catalyst is prepared in the present invention, the copper salt is preferably copper nitrate, the nickel salt is preferably nickel acetate, and the selected metal salt may or may not contain crystal water. The concentration of copper is preferably 0.2-0.6M; the concentration of nickel is preferably 0.2-0.6M. The complexing agent is preferably disodium ethylenediaminetetraacetic acid (EDTA·2Na). The dosage of the complexing agent is preferably 1 to 2 times the total moles of cobalt and aluminum. In the co-complexation reaction, the heating temperature is preferably 75-85° C., and the reaction time is preferably 8-10 hours. The drying temperature of t...

Embodiment 1

[0036] (1) Weigh 0.05mol Cu(NO 3 ) 2 ·3H 2 O and 0.05mol Ni(CH 3 COO) 2 4H 2 O, stirring and dissolving in the mixed solution of 100mL water and ethanol (volume ratio H 2 O:EtOH=1:1), that is, Cu in the resulting solution 2+ The concentration is 0.5M, Ni 2+ The concentration is 0.5M. Weigh 0.05mol ethylenediaminetetraacetic acid, add it into the above mixed solution, and stir and react at 70°C for 8h. The resulting precipitate was aged, filtered and washed to obtain CuNi-LDH.

[0037] (2) The obtained CuNi-LDH was dried at 100°C for 10h, then calcined in a muffle furnace at 400°C for 4h, and cooled to room temperature to obtain CuNi-NTs.

[0038] (3) CuNi-NTs in flowing H 2 The reduction reaction is carried out in a mixed gas atmosphere with Ar, where H 2 The volume fraction of CuNi-NMs was controlled to be 10%, the gas flow rate was controlled to be 80sccm, the temperature was controlled to be 500°C, the reduction time was 4h, and after natural cooling to room temp...

Embodiment 2

[0041] (1) Weigh 0.04mol Cu(NO 3 ) 2 ·3H 2 O and 0.08mol Ni(NO 3 ) 2 ·6H 2 O, stirring and dissolving in the mixed solution of 200mL water and ethanol (volume ratio H 2 O:EtOH=2:1), that is, Cu in the resulting solution 2+ The concentration is 0.2M, Ni 2+ The concentration is 0.4M. Weigh 0.16 mol of disodium ethylenediaminetetraacetate, add it to the above mixed solution, and stir and react at 80°C for 10h. The resulting precipitate was aged, filtered and washed to obtain CuNi-LDH.

[0042] (2) The obtained CuNi-LDH was dried at 105°C for 12h, then calcined in a muffle furnace at 450°C for 5h, and cooled to room temperature to obtain CuNi-NTs.

[0043] (3) CuNi-NTs in flowing H 2 The reduction reaction is carried out in a mixed gas atmosphere with Ar, where H 2 The volume fraction of CuNi-NMs was controlled to be 12%, the gas flow rate was controlled to be 70sccm, the temperature was controlled to be 550°C, the reduction time was 3h, and after natural cooling to roo...

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Abstract

The invention relates to preparation and application of catalysts and aims at providing preparation and application methods of a Cu-Ni-based catalyst for reversed water gas reaction. The preparation method comprises the following steps: dissolving soluble copper salt and soluble nickel salt into a mixed solution of water and ethanol; adding a complexing agent and reacting under heating and stirring conditions to obtain CuNi hydrotalcite; drying and roasting to prepare CuNi mixed oxide with a nanotube structure; after carrying out reduction reaction in a mixed gas atmosphere of flowing H2 and Ar, naturally cooling to room temperature, so as to obtain the Cu-Ni-based catalyst. The complexing preparation method provided by the invention is simple and feasible; influences, caused by uncertainfactors in a preparation process, on the structure and performance of the catalyst are avoided. Active components of the catalyst comprise copper and nickel and any noble metal is not used so that thepreparation cost of the catalyst is relatively low, and industrial large-scale production of the catalyst is easy to realize. The catalyst can be used for a CO synthesis technology and is further connected with a CO hydrogenation catalyst in series to produce alcohols and hydrocarbons with high additional value, so that the catalyst has an application prospect.

Description

technical field [0001] The invention relates to a catalyst and its preparation and application, in particular to a preparation and application method of a Cu-Ni-based catalyst for reverse water gas reaction. Background technique [0002] Due to the burning of a large amount of fossil energy by human production activities, the main greenhouse gas in the air—carbon dioxide (CO 2 ) concentration is constantly rising, and the resulting global warming problem is gradually becoming severe, which affects the earth's ecological environment and the sustainable development of human beings. Not only that, the contradiction between the high demand for energy in human production activities and the non-renewability of traditional fossil energy is becoming more and more obvious, and the resulting conflicts are also becoming more and more obvious. Therefore, for CO 2 The research on the resource application of this rich substance has become a breakthrough to solve energy problems and prom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C01B32/40
CPCB01J23/755C01B32/40
Inventor 王亮王凌翔肖丰收
Owner ZHEJIANG UNIV
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