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NiZnCu nanocomposite dehydrogenation catalyst and preparation method thereof

A dehydrogenation catalyst and nano-composite technology, applied in the direction of catalyst activation/preparation, catalyst protection, chemical instruments and methods, etc., can solve the problems of no catalytic activity and limited contribution, so as to improve catalytic activity, improve stability, prevent The effect of sintering

Active Publication Date: 2020-10-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current patents such as Chinese patent CN111111718A mainly focus on binary LDH, and studies have shown that ternary LDH doped with other metal substances may provide higher catalytic activity, and LDH is often used as a catalyst carrier, which itself does not have catalytic activity. Greatly limit its contribution in the field of catalysis

Method used

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  • NiZnCu nanocomposite dehydrogenation catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] At room temperature, 0.23g ZnCl 2 , 0.23gCuCl 2 ·6H 2 O, 0.80gNiCl 2 ·6H 2 O, 0.32g of urea and 80g of deionized water were added to the reaction kettle, stirred for 0.5h, heated to 110°C for hydrothermal reaction for 12h, cooled to room temperature, filtered, washed with 150g of deionized water for 3 times, and vacuum-dried at 60°C 6h, obtain NiZnCu layered hydroxide;

[0036] Weigh 1.00g of the above-prepared NiZnCu layered hydroxide, 31.08g of trishydroxymethylaminomethane, 1.00g of dopamine, 260g of deionized water, and 12g of concentrated hydrochloric acid with a concentration of 37% into the reaction kettle and mix evenly. React for 12 hours, filter after cooling down to room temperature, wash the filter cake with 200g of deionized water three times, and vacuum dry at 60°C for 12 hours to obtain NiZnCu layered hydroxide / polydopamine;

[0037] Add 0.14g of graphene oxide, 1.00g of NiZnCu layered hydroxide / polydopamine, and 80g of deionized water into the react...

Embodiment 2

[0041] At room temperature, 1.72g ZnCl 2 , 1.72g CuCl 2 ·6H 2 O, 8.60gNiCl 2 ·6H 2 O, 3.44g of urea and 860g of deionized water were added to the reaction kettle, stirred for 0.5h, heated to 120°C for hydrothermal reaction for 12h, cooled to room temperature and filtered, washed with 800g of deionized water for 4 times, vacuumed at 70°C Dry for 8h to obtain NiZnCu layered hydroxide;

[0042] Weigh 3.20g of the above-prepared NiZnCu layered hydroxide, 96.40g of tris, 4.00g of dopamine, 1200g of deionized water, and 60g of concentrated hydrochloric acid with a concentration of 37% into the reaction kettle and mix evenly. React for 14 hours, filter after cooling down to room temperature, wash the filter cake with 600g deionized water 4 times, and vacuum dry at 60°C for 12 hours to obtain NiZnCu layered hydroxide / polydopamine;

[0043] Add 0.25g of graphene oxide, 2.00g of NiZnCu layered hydroxide / polydopamine, and 200g of deionized water into the reaction kettle for mixing, ...

Embodiment 3

[0047] At room temperature, 0.65gZn(NO 3 ) 2 ·6H 2 O, 0.65gCu(NO 3 ) 2 ·3H 2 O, 3.00g Ni(NO 3 ) 2 ·6H 2 O, add 1.50g urea and 320g deionized water into the reaction kettle, stir for 1h, heat up to 130°C for hydrothermal reaction for 20h, cool down to room temperature, filter, wash the filter cake with 300g deionized water for 3 times, and vacuum dry at 60°C for 8h , to obtain NiZnCu layered hydroxide;

[0048] Weigh 2.00g of the above-prepared NiZnCu layered hydroxide, 81.20g of tris, 3.50g of dopamine, 800g of deionized water, and 35g of concentrated hydrochloric acid with a concentration of 37% into the reaction kettle and mix evenly. React for 16 hours, filter after cooling down to room temperature, wash the filter cake with 350g deionized water 4 times, and vacuum dry at 60°C for 10 hours to obtain NiZnCu layered hydroxide / polydopamine;

[0049] Add 0.25g of graphene oxide, 2.00g of NiZnCu layered hydroxide / polydopamine, and 170g of deionized water into the reacti...

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Abstract

The invention relates to a preparation method of a NiZnCu nanocomposite dehydrogenation catalyst. The preparation method of the catalyst comprises the following steps: firstly, synthesizing NiZnCu layered hydroxide; then adding dopamine, and carrying out a self-polymerization reaction on dopamine on the surface of the NiZnCu layered hydroxide under an alkaline condition to obtain NiZnCu layered hydroxide / polydopamine; then adding graphene oxide; carrying out a hydrothermal reaction to obtain NiZnCu layered hydroxide / polydopamine / graphene oxide; and finally, roasting at a high temperature of 400-600 DEG C in a nitrogen atmosphere to prepare the NiZnCu nanocomposite dehydrogenation catalyst. The catalyst is a nanocomposite of NiZnCu nitrogen-carbon core-shell nano-microspheres and reduced graphene oxide, the inner core of the NiZnCu nitrogen-carbon core-shell nano-microsphere is a NiZnCu alloy nano-microsphere, the diameter of the inner core is 10-100 nm, the shell of the inner core is anitrogen-carbon nanomaterial, and the thickness of the shell layer is 20-50 nm. The catalyst can be applied to pyridine catalytic dehydrogenation to synthesize 2, 2'-dipyridyl, can obtain higher 2, 2'-dipyridyl yield under the condition of relatively low catalyst consumption, and has favorable industrial application prospects.

Description

technical field [0001] The invention relates to a NiZnCu nanocomposite dehydrogenation catalyst and a preparation method thereof, belonging to the catalyst preparation technology in the technical field of catalysis. Background technique [0002] 2,2'-Bipyridine is an important intermediate in modern chemical production, and has been widely used in the fields of redox indicators, photosensitizers, supercritical carbon dioxide extraction, electroless copper plating, etc. Among them, as the herbicide diquat The demand for main raw material intermediates is huge. Therefore, the development of efficient 2,2'-bipyridine production technology is the key to reducing the production cost of diquat, and direct dehydrocoupling of pyridine is the greenest and safest production route for the synthesis of 2,2'-bipyridine. Therefore, it is of great economic value and market prospect to develop a catalyst with high yield, low cost, low pollution and no risk of operation to catalyze the dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J27/24B01J33/00B01J35/00B01J37/08B01J37/10B01J37/16C07D213/127C07D213/22
CPCB01J23/80B01J27/24B01J33/00B01J37/082B01J37/10B01J37/16C07D213/22C07D213/127B01J35/393
Inventor 周钰明汪嘉祺鲍杰华张一卫卜小海张泽武刘文奇王泳娟
Owner SOUTHEAST UNIV