Photo-thermal driving nickel-based catalyst as well as preparation method and application thereof

A nickel-based catalyst, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc., can solve the problems of limited large-scale application, rapid deactivation, etc. The effect of improving stability and high conversion efficiency

Active Publication Date: 2022-05-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nickel-based catalysts suffer from severe sintering and coking problems and rapidly deactivate over time, which limits their large-scale application

Method used

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  • Photo-thermal driving nickel-based catalyst as well as preparation method and application thereof
  • Photo-thermal driving nickel-based catalyst as well as preparation method and application thereof
  • Photo-thermal driving nickel-based catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of a photothermally driven methane dry reforming nickel-based core-shell structure catalyst is specifically prepared by the following method:

[0032] (1) Dissolve 0.164g magnesium nitrate hexahydrate, 0.135g aluminum nitrate hexahydrate, 0.12g silicon dioxide powder, and 2.7g urea in 8mL deionized water to form a first solution;

[0033] (2) Add 9 mL of ethanol to the first solution, and magnetically stir for 20 min at room temperature to form a suspension;

[0034] (3) Add 8mL of 0.1mol / L nickel nitrate solution to the suspension, then sonicate and stir for 5h;

[0035] (4) Transfer the stirred solution in (3) into a polytetrafluoroethylene liner, and put it into a high-pressure reactor for 36 hours at 190 °C;

[0036] (5) Centrifuge the mixed solution obtained after hydrothermal treatment in (4) at 8000 r / min, and wash the obtained precipitate three times with water and ethanol;

[0037] (6) drying the precipitate obtained in (5) at 80 °C overn...

Embodiment 2

[0048] A preparation method of a photothermally driven methane dry reforming nickel-based core-shell structure catalyst is specifically prepared by the following method:

[0049] (1) Dissolve 0.141g magnesium nitrate hexahydrate, 0.169g aluminum nitrate hexahydrate, 0.12g silicon dioxide powder, and 2.7g urea in 8mL deionized water to form a first solution;

[0050] (2) Add Lml of ethanol to the first solution, and magnetically stir at room temperature for 20 min to form a suspension;

[0051] (3) Add 8ml of 0.1mol / L nickel nitrate solution to the suspension, then sonicate and stir for 5h;

[0052] (4) Transfer the stirred solution in (3) into a polytetrafluoroethylene liner, and put it into an autoclave at 180°C for 40 hours of reaction;

[0053] (5) Centrifuge the mixed solution obtained after hydrothermal treatment in (4) at 8000 r / min, and wash the obtained precipitate three times with water and ethanol;

[0054] (6) drying the precipitate obtained in (5) at 80°C overnig...

Embodiment 3

[0059] A preparation method of a photothermally driven methane dry reforming nickel-based core-shell structure catalyst is specifically prepared by the following method:

[0060] (1) Dissolve 0.103g magnesium nitrate hexahydrate, 0.225g aluminum nitrate hexahydrate, 0.12g silicon dioxide powder, and 2.7g urea in 8mL deionized water to form a first solution;

[0061] (2) Add 8 mL of ethanol to the first solution, and magnetically stir for 20 min at room temperature to form a suspension;

[0062] (3) Add 4mL of 0.2mol / L nickel nitrate solution to the suspension, then sonicate and stir for 5h;

[0063] (4) Transfer the stirred solution in (3) into a polytetrafluoroethylene liner, and put it into a high-pressure reactor for 30 hours at 200°C;

[0064] (5) Centrifuge the mixed solution obtained after hydrothermal treatment in (4) at 8000 r / min, and wash the obtained precipitate three times with water and ethanol;

[0065] (6) drying the precipitate obtained in (5) at 80 °C overni...

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Abstract

The invention discloses a photo-thermal driving nickel-based catalyst as well as a preparation method and application thereof. The expression of the catalyst is Ni / MgAlOx coated SiO2, the preparation method comprises the following steps: by taking SiO2 particles as a core, growing mutually connected Ni / MgAlOx nanosheets on the SiO2 particles to form a shell to form a core-shell structure; wherein the Ni / MgAlOx nanosheet is prepared from metal nickel and magnesium aluminum silicate through strong interaction of a metal carrier. The core-shell structure catalyst Ni / MgAlOx (at) SiO2 is prepared by adopting a one-pot hydrothermal method, taking magnesium aluminum silicate with a high specific surface area as a carrier and taking nickel as an active metal component. The catalyst provided by the invention enhances CO2 absorption and activation capabilities, reduces the influence of catalyst sintering on reaction activity, shows high spectral absorption capability in an ultraviolet-visible light range, and realizes high-performance long-time photo-thermal driven methane dry reforming reaction.

Description

technical field [0001] The invention belongs to a solar fuel catalyst, in particular to a photothermal driven methane dry reforming nickel-based core-shell structure catalyst and a preparation method thereof. Background technique [0002] The greenhouse gas methane (CH 4 ) has increased by nearly 10 percent over the past two decades, with its atmospheric concentration setting a new record of 1.875 ppm. Due to CH 4 The heating capacity of CO is CO 2 80 times, so CH 4 It is the second largest greenhouse gas produced by human activities. Therefore, how to deal with these greenhouse gases has become an urgent problem to be solved. will CO 2 and CH 4 The two main greenhouse gases are converted into syngas with added value, namely H 2 and CO, a process known as methane dry reforming, is considered one of the most beneficial ways to achieve sustainable development. For methane dry reforming catalysts, noble metals (Pt, Pd, Rh, Ru) have been extensively studied and demonstr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J35/08C01B3/40
CPCB01J23/78B01J23/002B01J35/0013B01J35/008B01J35/004B01J35/08C01B3/40B01J2523/00C01B2203/0227C01B2203/1058C01B2203/1041C01B2203/1241B01J2523/22B01J2523/31B01J2523/41B01J2523/847Y02P20/52
Inventor 刘向雷凌月悦宣益民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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