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A Zn-Cr hydrotalcite-derived Ni-based catalyst for hydrogen production by autothermal reforming of acetic acid

A nickel-based catalyst, autothermal reforming technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, heterogeneous catalyst chemical elements, etc., can solve catalyst deactivation, intolerance Solve problems such as sintering and poor stability, and achieve the effects of stable skeleton structure, improved oxidation resistance, and good thermal stability

Active Publication Date: 2019-05-03
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a stable structure, resistant A new type of catalyst with sintering, anti-oxidation, anti-coke, stable activity

Method used

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  • A Zn-Cr hydrotalcite-derived Ni-based catalyst for hydrogen production by autothermal reforming of acetic acid
  • A Zn-Cr hydrotalcite-derived Ni-based catalyst for hydrogen production by autothermal reforming of acetic acid
  • A Zn-Cr hydrotalcite-derived Ni-based catalyst for hydrogen production by autothermal reforming of acetic acid

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Weigh 2.398g of Ni(NO 3 ) 2 ·6H 2 O, 5.213g of Zn(NO 3 ) 2 ·6H 2 O and 10.311g of Cr(NO 3 ) 3 9H 2 O, add 51.5ml of deionized water to prepare solution #1; weigh 8.246g of NaOH and 1.366g of anhydrous Na 2 CO 3 , add 219.0ml of deionized water to prepare solution #2; at 78°C and the pH of the solution at 10.5±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 14h; after aging, the mixture is suction filtered and washed 3 times, and the resulting precipitate is dried in a 105°C drying oven for 12 hours, and the XRD characterization shows that no hydrotalcite structure is formed; the precipitate is roasted at 700°C for 4 hours A CUT-ZNC-101 catalyst was obtained after 1 hour. The molar composition of the catalyst is (ZnO) 0.5 (NiO) 0.16 (CrO 1.5 ) 0.34 , The weight percentage is: zinc oxide is 35.6%, nickel oxide is 15.4%, and chromium oxide is 49.0%.

[0029] Th...

example 2

[0032] Weigh 2.361g of Ni(NO 3 ) 2 ·6H 2 O, 10.410g of Zn (NO 3 ) 2 ·6H 2 O and 2.875g of Cr(NO 3 ) 3 9H 2 O, add 50.3ml of deionized water to prepare solution #1; weigh 8.047g of NaOH and 1.333g of anhydrous Na 2 CO 3 , adding 213.8ml of deionized water to prepare solution #2; the subsequent steps were the same as those in Reference Example 1 to obtain the CUT-ZNC-102 catalyst. The molar composition of the catalyst is (ZnO) 0.68 (NiO) 0.18 (CrO 1.5 ) 0.14 , The weight percentage is: zinc oxide is 69.2%, nickel oxide is 17.1%, and chromium oxide is 13.7%.

[0033] The activity of the CUT-ZNC-102 catalyst was investigated by the autothermal reforming reaction of acetic acid. The space velocity was 11250mL / (g-catalyst h), the reaction temperature was 700°C, and the feed ratio was CH 3 COOH / H 2 O / O 2 =1 / 4.0 / 0.28, the reaction time is 10h; the acetic acid conversion rate of the catalyst is about 99.5%, and the hydrogen production rate is 2.50molH 2 / molHAc, CO 2...

Embodiment 1

[0035] Weigh 2.432g of Ni (NO 3 ) 2 ·6H 2 O, 8.820g of Zn(NO 3 ) 2 ·6H 2 O and 5.070g of Cr(NO 3 ) 3 9H 2 O, add 50.7ml of deionized water to prepare solution #1; weigh 16.217g of NaOH and 2.686g of anhydrous Na 2 CO 3 , add 430.8ml of deionized water to prepare solution #2; the follow-up steps are the same as those in Reference Example 1 to obtain the precursor of Zn-Cr carbonate-type hydrotalcite structure, and its typical structure is shown in the attached figure 1 shown; after roasting, a zinc oxide-containing spinel phase (NiCr 2 o 4 / ZnCr 2 o 4 ) Zn-Ni-Cr-O composite oxide, its typical structure is as attached figure 2 As shown, the CUT-ZNC-103 catalyst is obtained; the catalyst is a mesoporous material, and its typical pore size distribution is shown in the attached image 3 As shown, the pores are concentrated in the range of 2-10 nm. The molar composition of the catalyst is (ZnO) 0.59 (NiO) 0.16 (CrO 1.5 ) 0.25 , The weight percentage is: zinc oxi...

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Abstract

The invention relates to a zinc-chromium hydrotalcite derivative nickel-based catalyst for autothermal reforming of acetate to produce hydrogen. In view of the problem that deactivation of the catalyst is caused by change of a catalyst structure of an existing catalyst in autothermal reforming of acetate and oxidation and sintering of active ingredients, the catalyst with stable structure, sintering resistance, carbon accumulation resistance, oxidation resistance and high activity is provided. Chemical components of the catalyst disclosed by the invention are (ZnO)a(NiO)b(CrO1.5)c, wherein a is 0.55 to 0.68, b is 0.12 to 0.18, and c is 0.14 to 0.33. According to the zinc-chromium hydrotalcite derivative nickel-based catalyst disclosed by the invention, a precursor of a Zn-Cr carbonate typehydrotalcite structure is prepared by adopting a co-precipitation method, and nickel as an active ingredient and chromium oxide as an auxiliary are introduced, zinc is replaced by the nickel, and thenickel and the chromium oxide enter into a framework of a hydrotalcite-like substance and a position of a laminated plate; a Zn-Ni-Cr-O compound oxide catalyst containing nickel spinel, which is roasted, is obtained, so that reduction of the nickel is promoted, the catalytic performance of the catalyst is improved, and the stable zinc oxide framework and the spinel structure are formed, and the oxidation resistance, the carbon accumulation resistance and the sintering resistance abilities of the catalyst in the autothermal reforming of the acetate are improved.

Description

technical field [0001] The invention relates to a nickel-based catalyst for autothermal reforming of acetic acid to produce hydrogen, in particular to a nickel-based catalyst for autothermal reforming of acetic acid to produce hydrogen, which uses a zinc-chromium hydrotalcite structure as a precursor. The field of producing hydrogen by thermal reforming. Background technique [0002] With the progress of the times and the rapid development of society, people's demand for energy has also increased. Fossil fuels are the main energy carrier today, but fossil fuels also bring environmental pollution problems. Finding efficient new energy sources to replace fossil fuels is an important goal of all countries today. Hydrogen is a clean secondary energy source. Combusting one gram of hydrogen can release 142 kilojoules of heat, which is three times the calorific value of gasoline. It is considered to be an ideal energy source in the 21st century. Hydrogen is widely distributed in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/86C01B3/22
CPCB01J23/002B01J23/866B01J2523/00C01B3/22B01J2523/847B01J2523/27B01J2523/67
Inventor 黄利宏贾玄弈杨季龙李辉谷谢星月
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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