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Core-shell structured catalyst for preparation of cyclohexanol by selective hydrodeoxygenation of catalytic guaiacol

A core-shell structure and guaiacol technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrogenation preparation, etc., can solve the problem of short service life of catalysts and selectivity of reaction products Low cost, easy polymerization of oxygen-containing compounds and other problems, to achieve the effect of cheap raw materials, good recycling performance, and good catalytic performance

Active Publication Date: 2015-09-23
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the harsh reaction conditions in the hydrodeoxygenation process, which requires high temperature and high pressure, the oxygen-containing compounds are easy to polymerize and coke, covering the surface of the catalyst, so that the service life of the catalyst is not long
Moreover, the selectivity of the reaction product is not high, which is also a major defect of the catalyst.

Method used

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  • Core-shell structured catalyst for preparation of cyclohexanol by selective hydrodeoxygenation of catalytic guaiacol
  • Core-shell structured catalyst for preparation of cyclohexanol by selective hydrodeoxygenation of catalytic guaiacol
  • Core-shell structured catalyst for preparation of cyclohexanol by selective hydrodeoxygenation of catalytic guaiacol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Weigh 7g Ni(NO 3 ) 2 x6 2 O, dissolve it in 700ml of ethanol aqueous solution (volume ratio of alcohol to water: 4:3), add 1g of polyvinylpyrrolidone (PVP) as a stabilizer, and stir well. Then, under stirring condition, 140ml of 25% ammonia water was added dropwise and left for 10min.

[0027] Step 2: Weigh 6g of surfactant cetyltrimethylammonium bromide (CTAB), add it into the above solution, stir evenly, and let stand for 10min. Then measure 20ml of tetraethyl orthosilicate (TEOS), and add it dropwise into the solution under stirring condition. Place it at room temperature for 48 hours.

[0028] Step 3: Filter out the precipitate, wash it with deionized water, dry it in an oven at 60°C for 12 hours, grind it after the end, calcinate it in a muffle furnace at 500°C for 6 hours, and finally reduce it in a hydrogen atmosphere at 550°C for 6 hours to obtain 20 %NiSiO 2 Core-shell catalysts.

[0029] 20%NiSiO 2 SEM and TEM images of core-shell catalysts can...

Embodiment 2

[0036] Step 1: Weigh 10.5g Ni(NO 3 ) 2 x6 2 O, dissolve it in 1000ml of ethanol aqueous solution (volume ratio of alcohol to water: 1:1), add 2g of polyvinylpyrrolidone (PVP) as a stabilizer, and stir well. Then, under stirring condition, 210ml of 25% ammonia water was added dropwise and left for 10min.

[0037] Step 2: Weigh 9g of surfactant cetyltrimethylammonium bromide (CTAB), add it into the above solution, stir evenly, and let stand for 10min. Then measure 30ml of tetraethyl orthosilicate (TEOS), and add it dropwise into the solution under stirring condition. Place it at room temperature for 48 hours.

[0038] Step 3: Filter out the precipitate, wash it with deionized water, dry it in an oven at 60°C for 12 hours, grind it after the end, calcinate it in a muffle furnace at 500°C for 4 hours, and finally reduce it in a hydrogen atmosphere at 550°C for 4 hours to obtain 20 %NiSiO 2 Core-shell catalysts.

[0039]Evaluation of catalytic performance: Add 20ml of decahy...

Embodiment 3

[0043] Step 1: Weigh 4.6g Ni(CH 3 COO) 2 4H 2 O, dissolve it in 700ml of ethanol aqueous solution (volume ratio of alcohol to water: 4:3), add 1g of polyvinylpyrrolidone (PVP) as a stabilizer, and stir well. Then, under stirring condition, 100 ml of 25% ammonia water was added dropwise and left for 10 min.

[0044] Step 2: Weigh 6 g of cetyltrimethylammonium bromide (CTAB) as a surfactant, add it to the above solution, stir evenly, and let stand for 10 minutes. Then measure 20ml of tetraethyl orthosilicate (TEOS), and add it dropwise into the solution under stirring condition. Place it at room temperature for 48 hours.

[0045] Step 3: Filter out the precipitate, wash it with deionized water, dry it in an oven at 60°C for 12 hours, grind it after the end, calcinate it in a muffle furnace at 500°C for 6 hours, and finally reduce it in a hydrogen atmosphere at 550°C for 6 hours to obtain 15 %NiSiO 2 Core-shell catalysts.

[0046] Evaluation of catalytic performance: Add 2...

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Abstract

The invention discloses core-shell structured catalyst for preparation of cyclohexanol by selective hydrodeoxygenation of catalytic guaiacol. A preparing method of SiO2-clad Ni@SiO2 core-shell structured catalyst includes the steps of adding soluble nickel salt and polyvinylpyrrolidone to alcohol-water mixed solvent, performing mixing, dropwise adding ammonia water under stirring, adding cetyltrimethylammonium bromide as surfactant, dropwise adding soluble silicon source, and performing violent mixing; and performing filtering, collecting, washing, drying, calcining and reducing to obtain the Ni@SiO2 core-shell structured catalyst. In hydrodeoxygenation reaction of the guaiacol, the Ni@SiO2 core-shell structured catalyst prepared by the preparing method has high target product selectivity, good sintering resistance, carbon accumulation resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a core-shell structure catalyst for catalyzing the selective hydrodeoxygenation of guaiacol to prepare cyclohexanol. Background technique [0002] With the depletion of fossil fuels, energy demand is getting tighter. Biomass has the characteristics of rich carbon content, large reserves, wide distribution, low pollution, cheap and renewable. Compared with fossil fuels, its sulfur and nitrogen content are lower, and its ash content is also very small. It is a potential petrochemical alternative energy source. As the main component of biomass, lignin is the main by-product of the paper industry, most of which are directly burned as fuel, which not only brings great pressure to the environment, but also causes serious waste of resources. Lignin is a natural polymer composed of phenylpropane structural units. Through liquefaction through directional catalytic depolyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J35/02C07C35/08C07C29/20B01J35/00
Inventor 张琦舒日洋龙金星张兴华马隆龙王铁军
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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