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Perovskite composite oxide loaded platinum catalyst and preparation and application thereof

A composite oxide and platinum catalyst technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, hydroxyl compound preparation, organic compound preparation, etc., can solve rare problems and achieve good activity retention and catalyst Superior performance and mild reaction conditions

Inactive Publication Date: 2018-12-21
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, breakthroughs have been made in the application of perovskite composite oxides in the catalytic industry, such as the decomposition reaction of nitric oxide, CO and CH 3 OH and (CH) X etc. have reported that perovskite oxides were used as catalysts in the combustion reactions of α, β-unsaturated aldehydes such as cinnamaldehyde or citral. There are few reports on selective catalytic hydrogenation reactions

Method used

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  • Perovskite composite oxide loaded platinum catalyst and preparation and application thereof
  • Perovskite composite oxide loaded platinum catalyst and preparation and application thereof
  • Perovskite composite oxide loaded platinum catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Take 0.03mol citric acid as a complexing agent, add 0.015mol yttrium nitrate, 0.0045mol cobalt nitrate, and 0.0105mol ferric nitrate into a mixed solution, stir for 0.5 hours and add 1 gram of SBA-15 to the above solution, After stirring for 2 hours, transfer the above solution to a water bath at 90°C to continue stirring to form a gel, then put it in a drying oven at 140°C to dry, and then pre-baked it in a muffle furnace at 500°C for 4 hours and then raised it to 950°C. °C for another 6 hours.

[0029] b. After the roasting is completed, use 0.05 mol of sodium hydroxide solution (concentration of 2 mol / L) to remove silicon, stir for 35 hours, filter with suction, rinse with a large amount of deionized water, and dry in an oven at 80°C for 10 hours. The product is YCo 0.3 Fe 0.7 o 3 Perovskite type composite oxide.

[0030] See attached image 3 , YCo prepared above 0.3 Fe 0.7 o 3 The perovskite-type composite oxide is characterized by wide-angle X-ray diffr...

Embodiment 2

[0039] a. Weigh 25 mg of the 5Pt / YCo prepared above 0.3 Fe 0.7 o 3 The platinum catalyst was treated in a vacuum oven at 90°C for 1 hour, followed by a pretreatment in 99.999% hydrogen at a temperature of 200°C for 2 hours.

[0040] b. Mix the above-mentioned pretreated catalyst with 0.5g of cinnamaldehyde in a mixed solution prepared by adding 9mL of isopropanol and 1mL of water, and pass in hydrogen gas with a purity of 99.999% and a pressure of 2.0MPa, in a constant temperature water bath at 90°C The catalytic hydrogenation reaction was carried out with electromagnetic stirring for 60 minutes.

[0041] C, after the hydrogenation reaction ends, its product is separated from the catalyzer, and its product is analyzed by gas chromatography, and its transformation rate is 98.9%, and the reaction rate is 5.93 (mol CAL · gPt -1 h -1 ), the selectivity of cinnamyl alcohol is 94.9%, the selectivity of phenylpropionaldehyde is 0.5%, and the selectivity of phenylpropanol is 4.6%...

Embodiment 3

[0043] Using 3Pt / YCo 0.3 Fe 0.7 o 3 Platinum catalyst (that is, the loading of Pt is 3%), the application in the liquid phase selective hydrogenation reaction of cinnamaldehyde, takes by weighing 40mg catalyst and 1.0g cinnamaldehyde, other conditions are the same as embodiment 2, react with gas chromatography after finishing Its product is analyzed, and its transformation rate is 54.8%, and reaction rate is 6.85 (mol CAL g Pt -1 h -1 ), the selectivity of cinnamyl alcohol is 93.3%, the selectivity of phenylpropanal is 4.6%, and the selectivity of phenylpropanol is 2.1%.

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Abstract

The invention discloses a perovskite composite oxide loaded platinum catalyst and preparation and application thereof. The preparation is characterized in that the loaded platinum catalyst is preparedfrom SBA-15 as a hard template agent, a chloroplatinic acid aqueous solution as an active component precursor and a YCoxFe1-xO3 perovskite composite oxide as a carrier through impregnation, drying, calcination and reduction of a sodium formate aqueous solution, and is used for a selective hydrogenation reaction of cinnamyl aldehyde. Compared with the prior art, the perovskite composite oxide loaded platinum catalyst has the advantages that Pt particle distribution is uniform, the specific surface area and the pore volume are large, and the loaded platinum catalyst is used for the selective hydrogenation reaction of cinnamyl aldehyde, is higher in catalytic activity, is simple in preparation process, is easily produced industrially, and is environmentally friendly in the reaction process.

Description

technical field [0001] The invention relates to the technical field of supported metal catalytic materials, in particular to a perovskite-type composite oxide material-supported platinum catalyst and its preparation and use in the liquid-phase selective hydrogenation reaction of α,β-unsaturated aldehyde compounds Applications. Background technique [0002] Catalytic selective hydrogenation reaction is widely used in basic research and chemical production because of its better atom utilization. With the deepening of research, many efficient green catalysts have emerged. Catalytic hydrogenation reactions generally include two types, one is the hydrocracking reaction of saturated compounds, and the other is the hydrogenation of compounds containing unsaturated double bonds such as aldehydes, ketones or carbon-carbon. The selective hydrogenation of α,β-unsaturated aldehydes to unsaturated alcohols is an important reaction in the synthesis of fine chemicals. How to selectively g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10C07C29/141C07C33/32
CPCC07C29/141B01J23/002B01J23/894B01J2523/00B01J35/613B01J35/633B01J35/647B01J2523/36B01J2523/842B01J2523/845C07C33/32
Inventor 李晓红薛玉洁吴鹏
Owner EAST CHINA NORMAL UNIV
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