Preparation of platinum/carbon nanotube catalyst and application of catalyst to furfural catalytic hydrogenation
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A carbon nanotube, catalytic hydrogenation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, organic chemistry, etc., to achieve convenient operation, high conversion rate and selectivity, and simple process Effect
Inactive Publication Date: 2015-11-18
ZHEJIANG UNIV
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[0005] The technical problem to be solved in the present invention is to provide a preparation of a platinum/carbon nanotube catalyst and carry out catalytic hyd
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Embodiment 1
[0026] The preparation method of platinum / carbon nanotube catalyst comprises the following steps:
[0027] (1) Pretreatment of carbon nanotube carrier
[0028] Weigh 3g of carbon nanotubes (MWNT, Beijing Deke Daojin Technology Co., Ltd., diameter 30-50nm, length 10-20um, purity > 95%) and put them into a round bottom flask, add 140ml concentrated nitric acid; ultrasonic treatment at room temperature for 30 Minutes later, reflux for 4 hours at 120°C under agitation; after the reaction, cool to room temperature, take out the carbon nanotubes and soak them in deionized water repeatedly, wash and filter until the pH value of the filtrate is 7; then the carbon nanotubes drying at 100° C. for 12 hours to obtain a carbon nanotube carrier for loading active components;
[0029] (2) Preparation of platinum / carbon nanotube catalyst
[0030] Take 0.1mL concentration as 0.1g·mL -1 Chloroplatinic acid, and the deionized water of 2.2mL is made into dilute solution of chloroplatinic acid,...
Embodiment 2
[0034] A method for catalytic hydrogenation of furfural under mild conditions, comprising the following steps:
[0035] (1) Add 0.5mL furfural, 0.1g of 1.0wt% platinum / carbon nanotube catalyst and 5mL ethanol solvent in the reactor;
[0036] (2) Filling the reactor with hydrogen until the pressure is 2MPa and emptying, repeating the operation 5 times to replace and remove the air in the reactor; finally filling the reactor with hydrogen until the pressure is 3MPa;
[0037] (3) Adjust the stirring rate of the reactor to 500r / min, and react at room temperature (25° C.) for 5 hours (the reaction does not need to be heated, and the reaction is carried out at room temperature);
[0038] (4) After the reaction is completed, the hydrogen in the reactor is discharged, the reacted mixture is taken out, the catalyst is separated by filtration, and the product of furfural catalytic hydrogenation is obtained.
[0039] (5) The product was quantitatively analyzed by SP-6890 gas chromatogra...
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Abstract
The invention relates to a furfural catalytic hydrogenation technology and aims to provide preparation of a platinum/carbon nanotube catalyst and an application of the catalyst to furfural catalytic hydrogenation. The preparation process for the catalyst comprises: performing ultrasonic and heating stirring reflux treatment on a carbon nanotube in concentrated nitric acid at the room temperature, cooling, taking out, soaking, washing and performing suction filtration until filter liquor is neutral; then drying for later use; adding a treated carbon nanotube carrier into a chloroplatinic acid dilute solution, and performing same-volume dipping and standing at the room temperature; removing the moisture by distillation under magnetic stirring and warm water bath conditions, and drying; and before use, performing high-temperature reduction on a catalyst in a nitrogen-hydrogen mixed atmosphere to obtain the platinum/carbon nanotube catalyst with the platinum loading capacity of 1.0 wt%. The method is simple in process, convenient to operate and low in energy consumption, no heating is required in a reaction, and the pressure of used hydrogen is relatively low. Furfural can be hydrogenated under the room-temperature condition, so that the conversion rate and the selectivity are relatively high. The catalyst still can keep high activity after being used for multiple times, so that carbon deposition is basically not caused.
Description
technical field [0001] The invention relates to the catalytic hydrogenation technology of furfural under mild conditions, in particular to the preparation and application of a catalyst used in the catalytic hydrogenation of furfural under mild conditions. Background technique [0002] Energy is the basis for the survival and development of modern society. Biomass energy is one of the effective energy sources to replace traditional fossil fuels due to its advantages of wide source, renewable and environmental friendliness. However, because bio-oil has the characteristics of strong acidity, high water content, high oxygen content, etc., and is easy to condense, resulting in unstable properties, therefore, bio-oil must be upgraded before use to enhance its quality. However, the composition of bio-oil is complex, containing a variety of unsaturated oxygen-containing compounds, including acids, phenols, aldehydes, ketones, esters, and sugars. The existence of substances such as...
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