Lithium aluminum hydrotalcite-derived nickel-based catalysts for autothermal reforming of acetic acid to hydrogen

A nickel-based catalyst, autothermal reforming technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydrogen, etc., can solve the problem of catalyst deactivation, easy to be oxidized, not resistant to sintering and other problems, to achieve the effect of promoting gasification reaction, promoting adsorption activation, and improving dispersion degree

Active Publication Date: 2019-11-05
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a stable structure and sintering-resistant , anti-oxidation, anti-coking, new catalyst with stable activity

Method used

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  • Lithium aluminum hydrotalcite-derived nickel-based catalysts for autothermal reforming of acetic acid to hydrogen
  • Lithium aluminum hydrotalcite-derived nickel-based catalysts for autothermal reforming of acetic acid to hydrogen
  • Lithium aluminum hydrotalcite-derived nickel-based catalysts for autothermal reforming of acetic acid to hydrogen

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Weigh 2.322g of Ni (NO 3 ) 2 ·6H 2 O, 22.609g of Al(NO 3 ) 2 9H 2 O and 1.527 g of LiNO 3 , add 90.3ml of deionized water to prepare solution #1; weigh 28.930g of NaOH and 4.791g of anhydrous Na 2 CO 3 , adding 200.8ml of deionized water to prepare solution #2; at 48°C and pH of the solution at 8.0±0.5, add solution #1 and solution #2 dropwise into the beaker and keep stirring for co-precipitation reaction, and Continue stirring and aging for 12 hours; after the aging, the mixture is suction filtered and washed three times, and the obtained precipitate is dried in a 105°C drying oven for 24 hours; the precipitate is calcined at 750°C for 4 hours to obtain CDUT-LNA-101 catalyst. The molar composition of the catalyst is (LiO 0.5 ) 1.47 (NiO) 0.53 (AlO 1.5 ) 4.00 , and the composition in weight percent is as follows: lithium oxide is 8.0%, nickel oxide is 15.0%, and aluminum oxide is 77.0%.

[0030] The reactivity evaluation of autothermal reforming of acetic ...

Embodiment 1

[0033] Weigh 2.369g of Ni (NO 3 ) 2 ·6H 2 O, 16.299g of Al(NO 3 ) 2 9H 2 O and 5.250 g of LiNO 3 , add 130.7ml of deionized water to prepare solution #1; weigh 8.342g of NaOH and 1.381g of anhydrous Na 2 CO 3 , add 221.8ml of deionized water to prepare solution #2; the subsequent steps are the same as in Reference Example 1 to obtain a precursor of hydrotalcite-like structure, and its typical structure is shown in the attached figure 1 shown; Li-Ni-Al-O composite oxide of nickel-aluminum spinel partially substituted by lithium was obtained after calcination, and its typical structure is shown in the attached figure 2 shown. Promptly obtain CDUT-LNA-102 catalyst; This catalyst is a mesoporous material, and its typical pore size distribution is as attached image 3 shown. The molar composition of the catalyst is (LiO 0.5 ) 3.63 (NiO) 0.38 (AlO 1.5 ) 2.00 , and the composition in weight percent is as follows: lithium oxide is 17.0%, nickel oxide is 15.0%, and alum...

Embodiment 2

[0036] Weigh 2.330g of Ni(NO 3 ) 2 ·6H 2 O, 20.038g of Al(NO 3 ) 2 9H 2 O and 3.130 g of LiNO 3 , add 160.3ml of deionized water to prepare solution #1; weigh 34.187g of NaOH and 5.661g of anhydrous Na 2 CO 3 , adding 200.7ml of deionized water to prepare solution #2; the subsequent steps are the same as in Reference Example 1 to obtain a precursor of hydrotalcite-like structure, and its typical structure is shown in the attached figure 1 As shown, Li-Ni-Al-O composite oxide of nickel-aluminum spinel partially substituted by lithium was obtained after calcination, and its typical structure is shown in the attached figure 2 As shown, promptly obtain CDUT-LNA-103 catalyst. The molar composition of the catalyst is (LiO 0.5 ) 3.40 (NiO) 0.60 (AlO 1.5 ) 4.00 , The weight percentage is: lithium oxide is 30.0%, nickel oxide is 15.0%, and aluminum oxide is 55.0%.

[0037] The activity of the CDUT-LNA-103 catalyst was investigated by the autothermal reforming reaction of...

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Abstract

The invention relates to a lithium-aluminium hydrotalcite-derived nickle-based catalyst used for hydrogen production by acetic acid auto-thermal reforming. In order to solve the problem that for existing catalysts, in acetic acid auto-thermal reforming reaction, change of catalyst structures and oxidation and sintering of active components cause inactivation of the catalysts, the novel catalyst which is stable in structure, sintering-resistant, carbon-deposition-resistant and oxidation-resistant is provided. Chemical components of the catalyst are (LiO0.5)a(NiO)b(AlO1.5)c, wherein a is 1.47-3.63, b is 0.38-0.60, and c is 2.00-4.00. According to the lithium-aluminium hydrotalcite-derived nickle-based catalyst used for hydrogen production by acetic acid auto-thermal reforming, a coprecipitation method is adopted for preparing a precursor of a Li-Al carbonate hydrotalcite structure, through calcination, the nickel aluminate Li-Ni-Al-O compound oxide catalyst with lithium partially replaced is obtained, gasification of a carbon-containing intermediate is promoted, and the thermal stability and the catalytic activity of the catalyst in the acetic acid auto-thermal reforming reaction areimproved.

Description

technical field [0001] The invention relates to a nickel-based catalyst for the autothermal reforming of acetic acid to produce hydrogen, in particular to a nickel-based catalyst for the autothermal reforming of acetic acid to produce hydrogen, which uses a lithium aluminum hydrotalcite structure as a precursor. The field of producing hydrogen by autothermal reforming of acetic acid. Background technique [0002] Today, the main energy sources for human life and production are still fossil energy such as natural gas and oil; however, ecological and environmental problems such as resource scarcity, greenhouse effect, and air pollution are becoming increasingly prominent, and countries are paying more and more attention to the development and utilization of clean energy. In recent years, hydrogen energy has become a research hotspot for scientists from all over the world, mainly because of its high energy density, good thermal conductivity, good combustion performance, various...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78C01B3/32
Inventor 黄利宏胡晓敏杨季龙王巧
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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