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A kind of supported metal diatomic catalyst and its preparation method and application

A diatom and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of low ethanol selectivity and low conversion efficiency, and achieve high activity Effect

Active Publication Date: 2021-04-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to achieve highly active CO 2 Hydrogenation to ethanol is a challenging task because CO 2 is a thermodynamically stable and chemically inert molecule, which makes its conversion extremely inefficient and correspondingly requires high temperatures to trigger the catalytic reaction (>200°C)
In addition, the reaction process of producing ethanol is limited by thermodynamics, under the reaction pressure condition of 1-30bar, CO 2 Hydrogenation preferentially produces CO or CH 4 , which results in very low selectivity to ethanol

Method used

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  • A kind of supported metal diatomic catalyst and its preparation method and application
  • A kind of supported metal diatomic catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: synthesis oxide carrier CeO 2

[0027] At 25°C, dissolve cerium nitrate in water to prepare a cerium nitrate solution with a concentration of 0.15 mol / L, add 0.15 mol / L sodium carbonate solution to the cerium nitrate solution, stir for 6 hours and then let stand for more than 12 hours; filter to obtain precipitate , after repeated washing with deionized water, dry in the air to obtain basic cerium carbonate; in N 2 and O 2 Under the atmosphere, basic cerium carbonate was calcined at 400°C for 3 hours to obtain the oxide support CeO 2 .

Embodiment 2

[0028] Embodiment 2: synthetic CeO 2 supported Pd catalyst

[0029] At 25°C, palladium nitrate was prepared into a 0.15 mmol / L Pd metal precursor aqueous solution, and HCl was added to adjust the isoelectric point of the solution to 5 to form a 2-membered coordination configuration. CeO 2 The carrier is dispersed in water, and the CeO is lifted by ultrasonic vibration for 5 minutes 2 The degree of dispersion of the carrier in the solution. The palladium nitrate solution is added in the above-mentioned support oxide solution by the method (injection speed 0.5ml / min) of peristaltic pump microsampling, makes it evenly dispersed on the surface of oxide support, after filtering, vacuum drying, in Calcined at 300°C in air for 4 hours to form CeO 2 Supported Pd diatomic catalysts.

[0030] CeO synthesized above 2 Loaded Pd catalyst, the mass percentage of Pd is 0.5wt.%, abbreviated as 0.5wt.%Pd 2 / CeO 2 .

[0031] PD 2 / CeO 2 Extended X-ray Edge-Fine Adsorption Spectroscop...

Embodiment 3

[0038] Embodiment 3: synthetic CeO 2 Supported Pt catalyst

[0039] Synthetic method is similar to embodiment 1, and the catalyst that obtains is 0.8wt.%Pt 2 / CeO 2 .

[0040] After testing, the reaction pressure is 2MPa and H 2 / CO 2 Under the condition of ratio 3, 0.8wt.%Pt 2 / CeO 2 Catalyst to CO 2 The conversion rate was 14.2%, and the ethanol selectivity was 99.8%.

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Abstract

The invention discloses a supported metal diatomic catalyst, its preparation method and application. The preparation method comprises: dissolving chlorides or nitrates of platinum group metals in water or alcohol solvents to obtain a metal precursor solution, controlling the precursor The temperature of the precursor solution is 20-40°C, and the isoelectric point of the solution is 1-8, so that the platinum group metal in the metal precursor solution forms a 2-membered coordination configuration; the oxide carrier is dispersed in water or alcohol solvent to prepare support solution, wherein the oxide support includes CeO 2 , Ga 2 o 3 、In 2 o 3 , ZnO; the metal precursor solution is added to the carrier solution, so that the metal precursor is uniformly dispersed on the surface of the oxide carrier; after filtering and drying, it is roasted in air or oxygen to obtain a supported metal double-atom catalyst. Supported metal diatomic catalyst of the present invention, to CO 2 Catalytic hydrogenation to ethanol has high activity and high selectivity.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a supported metal diatomic catalyst and its preparation method and application. Background technique [0002] will CO 2 Catalytic hydrogenation to produce high-value chemicals is of great commercial and environmental significance, not only for the mitigation of CO 2 caused by the greenhouse effect, but also provides the CO 2 Method of conversion to C1 base stock. In particular, with the C1 product (CO, CH 4 and CH 3 OH) compared to ethanol as a renewable fuel additive and an outstanding motor fuel with higher energy density is CO 2 One of the most ideal products for hydrogenation. However, to achieve highly active CO 2 Hydrogenation to ethanol is a challenging task because CO 2 is a thermodynamically stable and chemically inert molecule, which makes its conversion extremely inefficient and correspondingly requires high temperatures to trigger the catalytic reaction (>...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J23/62B01J23/60C07C29/157C07C31/08C07C29/158
CPCB01J23/63B01J23/62B01J23/60C07C29/157C07C29/158B01J35/394C07C31/08
Inventor 娄阳姜枫姚庭怡王莉朱永法刘小浩
Owner JIANGNAN UNIV
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