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Preparation method of alpha-terpinene high yield catalyst

A high-yield technology of terpinene, which is applied in the field of catalyst preparation, can solve the problems of no α-terpinene catalyst documented in the literature, and achieve the effect of improving selectivity

Inactive Publication Date: 2015-09-16
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The above-mentioned documents are quoted here as background technology, and after searching, no document is found to use carbon nanotube-loaded silicotungstic heteropolyacid as α-terpinene catalyst

Method used

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Embodiment

[0017] 1) Preparation of silicotungstic heteropoly acid: weigh 50g Na 2 WO 3 2H 2 O was dissolved in distilled water and 4 g of Na was added under vigorous stirring 2 SiO 3 9H 2 O, heat in a water bath to 90-95°C, add 20-30ml of concentrated hydrochloric acid dropwise under stirring, adjust the pH to 1-2, react for 8 hours and then filter with suction, add 25-30ml of ether to the filtered liquid, and add dropwise H at a volume ratio of 1:1 2 SO 4 10-15ml, fully shaken, and after static layering, separate the oily substance in the lower layer, place it in a constant temperature drying oven to dry, and precipitate silicotungstic heteropolyacid crystals.

[0018] 2) Preparation of catalyst: Weigh 0.2g of silicotungstic acid and 1g of treated carbon nanotubes, prepare a supported catalyst by impregnation method, seal it with a plastic wrap and place it for 24 hours, dry it, and then roast it at 190°C for 3 hours to obtain a supported catalyst. Type silicotungstic heteropoly...

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Abstract

The invention relates to a preparation method of a catalyst, and concretely relates to a preparation method of an alpha-terpinene high yield catalyst. The method comprises the following steps: 1, preparing silicotungstic acid; 2, immersing carbon nano-tubes in nitric acid with the concentration of 10-18% at normal temperature for 12h, washing, filtering, drying, dissolving silicotungstic acid in deionized water, uniformly stirring, adding the carbon nano-tubes into the obtained silicotungstic acid solution according to a mass ratio of silicotungstic acid to the carbon nano-tubes of 20-40:100, stirring for 4h, carrying out sealed ageing for 24-48h, drying, and roasting at 190DEG C for 3h to prepare carbon nano-tube supported silicotungstic acid. The carbon nano-tubes with large apertures are especially selected in the invention, and the aperture of the catalyst obtained after supporting the silicotungstic acid by the carbon nano-tubes is similar to the molecular effective path of alpha-terpinene, and the aperture is used to improve the product selectivity.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a high-yield α-terpinene catalyst. Background technique [0002] α-pinene carries out isomerization reaction under different catalyst conditions, and the distribution difference of its product is bigger, and the main purpose of this technology is exactly in order to improve the yield of monocyclic terpene (limonene, terpinene, etc.), miscellaneous Although polyacids have excellent catalytic properties, they have poor thermal stability and small surface area. A fixed-bed reactor is used to carry out gas-solid phase reaction to α-pinene, and the reaction temperature is high. Therefore, in order to improve the thermal stability of heteropolyacids There are many types of carriers, such as activated carbon, alumina, molecular sieve, etc., which are commonly used. [0003] "The influence of acid on the catalytic performance of silicotungstic heteropoly acid i...

Claims

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Application Information

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IPC IPC(8): B01J31/16C07C13/23C07C5/25
Inventor 李凝滕俊江
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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