A hydrotalcite-derived cobalt-based catalyst is promoted by an auxiliary for autothermal reforming of acetic acid for hydrogen production

A cobalt-based catalyst and autothermal reforming technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as catalyst deactivation and carbon deposition , to achieve high activity, promote diffusion, and good catalytic stability.

Inactive Publication Date: 2019-02-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • 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 structurally stable, A new catalyst with sintering resistance, carbon deposition resistance, oxidation resistance and stable activity

Method used

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  • A hydrotalcite-derived cobalt-based catalyst is promoted by an auxiliary for autothermal reforming of acetic acid for hydrogen production
  • A hydrotalcite-derived cobalt-based catalyst is promoted by an auxiliary for autothermal reforming of acetic acid for hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Weigh 2.329g Co(NO 3 ) 2 ·6H 2 O, add 74.7 ml of deionized water to make solution #1. Weigh out 23.904g NaOH and 3.950g Na 2 CO 3 , and 634.9 ml of deionized water was added to prepare precipitant solution #2. Under the conditions of 68°C and PH=10.5±0.5, the solutions #1 and #2 were subjected to co-precipitation reaction, and the stirring was continued for 18 hours; after the aging, the mixed solution was filtered and washed three times, and the resulting precipitate was transferred to vacuum drying In the oven, drying at 105 °C for 12 hours, the hydrotalcite-like precursor was obtained, and its typical X-ray diffraction spectrum is shown in the attached figure 1 then calcined at 650°C for 4 hours, tableted and sieved to obtain a 20-40 mesh CDUT-CAF-0 catalyst, the composition of which is (Co 3 O 4 ) 0.12 (Al 2 O 3 ) 1.5 , and its X-ray diffraction pattern is shown in Figure 2. The weight percentage of the catalyst is: 15.0% of cobalt oxide and 85.0% of alu...

example 2

[0030] Weigh 2.343g Co(NO 3 ) 2 ·6H 2 O, 4.202g Fe(NO 3 ) 3 9H2O and 18.881g Al(NO 3 ) 3 ·9H 2 O, add 68.7 ml of deionized water to make solution #1. Weigh out 22.012g NaOH and 3.645g Na 2 CO 3 , 584.7 ml of deionized water was added to prepare precipitant solution #2. The subsequent steps are the same as in Reference Example 1, and the typical structure of the hydrotalcite-like precursor is shown in Figure 1; after calcination, a CDUT-CAF-20 catalyst is obtained, which is composed of (Fe 2 O 3 ) 0.21 (Co 3 O 4 ) 0.16 (Al 2 O 3 ) 1.5 , and its typical structure is shown in Figure 2. The weight percentage of the catalyst is: 15.1% of cobalt oxide, 20.8% of iron oxide, and 64.1% of aluminum oxide.

[0031] The CDUT-CAF-20 catalyst was tested for the activity of acetic acid autothermal reforming, and the reaction conditions were the same as those of Reference Example 1. The acetic acid conversion rate of the catalyst was 85.46%, and the hydrogen yield was low, ...

Embodiment 1

[0033] Weigh 2.364g Co(NO 3 ) 2 ·6H 2 O, 2.188g Fe(NO3)3 9H2O and 23.543g Al(NO3 3 ) 3 ·9H 2 O, add 71.5 ml of deionized water to make solution #1. Weigh out 22.904g NaOH and 3.793g Na 2 CO 3 , and 608.4 ml of deionized water was added to make solution #2. The subsequent steps are the same as in Reference Example 1, and the typical structure of the hydrotalcite-like precursor is shown in Figure 1; after calcination, a CDUT-CAF-10 catalyst is obtained, which is composed of (Fe 2 O 3 ) 0.14 (Co 3 O 4 ) 0.14 (Al 2 O 3 ) 1.5 , and its typical structure is shown in Figure 2. The weight percentage of the catalyst is: 15.2% of cobalt oxide, 10.8% of iron oxide, and 74% of alumina.

[0034] The CDUT-CAF-10 catalyst was tested for the activity of autothermal reforming of acetic acid, and the reaction conditions were the same as those of Reference Example 1. The acetic acid conversion of the catalyst is stable at 100%, and the hydrogen yield is stable at about 2.41mol-...

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Abstract

The invention relates to an iron-promoted cobalt-based catalyst used for hydrogen preparation through auto-thermal reforming of acetic acid and derived from carbonated LDHs (layered double hydroxides)structures. In order to solve the problem about inactivation of existing catalysts due to change of catalyst structures as well as oxidation and calcination of active components in the auto-thermal reforming process of acetic acid, the catalyst with sintering resistance, carbon deposition resistance, oxidation resistance and high activity is provided. The chemical ingredient of the catalyst is (Fe2O3)a(Co3O4)b(Al2O3)1.5, wherein a ranges from 0 to 0.21 and b ranges from 0.12 to 0.16. The Co-Fe-Al LDHs structure is taken as a precursor, and accordingly, active component, namely, cobalt, can beconveniently introduced into the layered structure; meanwhile, an auxiliary, namely, iron, inhibits the acidity of a catalyst carrier, the reducibility and the stability of the active ingredient of the catalyst are improved, and the hydrogen yield is notably increased and kept stable.

Description

technical field [0001] The invention relates to a carbonate-type hydrotalcite-like structure-derived auxiliary-promoting cobalt-based catalyst for producing hydrogen by autothermal reforming of acetic acid and a preparation method thereof, and belongs to the field of producing hydrogen by autothermal reforming of acetic acid. Background technique [0002] Hydrogen is an important energy carrier that powers mobile devices such as cars and ships. Fossil fuels such as natural gas and coal can be converted to hydrogen, however, this method releases additional carbon dioxide into the atmosphere. Biomass feedstocks are renewable and relatively inexpensive, and hydrogen production from biomass is a carbon-neutral approach to hydrogen production. However, the low energy density of biomass brings inconvenience to storage and transportation, so researchers use rapid pyrolysis to convert biomass into biomass oil with higher energy density. The components of biomass oil are complex. I...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J37/03B01J37/08C01B3/32
CPCB01J23/002B01J23/75B01J37/03B01J37/088B01J2523/00C01B3/326C01B2203/0244C01B2203/1052B01J2523/31B01J2523/842B01J2523/845
Inventor 黄利宏王巧周庆李辉谷杨季龙
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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