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Nanogold catalyst adhered to inner wall of microtube as well as preparation method and application thereof

A nano-gold and catalyst technology, which is applied in the direction of molecular sieve catalyst, oxidation reaction preparation, carbon-based compound preparation, etc., can solve the problem that the selectivity of cyclohexane oxidation reaction has not been significantly improved, and achieve good mass and heat transfer performance and loading efficiency High and selective effect

Inactive Publication Date: 2014-11-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no catalytic oxidation reaction of cyclohexane in microtubes. Although the space-time yield and safety have been greatly improved, the selectivity of cyclohexane oxidation reaction has not been significantly improved. The side reaction of the oxidation reaction has a catalytic effect, and coating the catalyst on the tube wall can effectively eliminate the side reaction, so it is worth further study in which way to coat which catalyst in the tube

Method used

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  • Nanogold catalyst adhered to inner wall of microtube as well as preparation method and application thereof
  • Nanogold catalyst adhered to inner wall of microtube as well as preparation method and application thereof
  • Nanogold catalyst adhered to inner wall of microtube as well as preparation method and application thereof

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Effect test

Embodiment 1

[0034] Preparation of boehmite sol suspension A. Put 20g of boehmite into a certain concentration of nitric acid solution, stir mechanically at room temperature for 30 minutes, and use it after standing for two days. After the boehmite was hydrolyzed, polyvinyl alcohol (Shanghai Chemical Reagent Co., Ltd.) with a content of 4% of the total mass of the boehmite solution was added to obtain the boehmite sol suspension A.

Embodiment 2

[0036] Preparation of supported gold catalyst suspension B. Take 20.00g of γ-Al with a particle size of 0.1~0.3μm 2 o 3 , mix 4.00g of PVA with 76mL of water, adjust the pH of the above mixed solution to 7 with nitric acid solution or KOH solution, stir mechanically for 15 h to make the above mixed solution fully mix to form a stable suspension, slowly add 4.22ml dropwise with a concentration of 1g / L's chloroauric acid (HAuCl 4 4H 2 O, analytically pure, 47.8%, Aladdin Chemical Reagent Co., Ltd.) solution, and continued to stir for 10 h to obtain gold-loaded catalyst suspension B.

Embodiment 3

[0038] Preparation of microtubes C coated with supported gold nanocatalysts inside the tubes. Select a microtube with an outer diameter of 1.6 mm, an inner diameter of 1 mm, and a length of 9 m, made of 316 stainless steel, and roll it into a ring with a diameter of 20 cm. Use 30% hydrochloric acid solution, detergent (such as Mr. Wittmann's sweet kumquat flavor 500mL) and acetone in sequence, and use a device consisting of a syringe 1, an ultrasonic scrubber 2, a microtube 3 and a waste liquid bottle 4 ( figure 1 ) to wash the inner wall of the microtube at a flow rate of 80mL / h. Extract 20mL of the above-mentioned boehmite sol suspension with a syringe, and use a device consisting of a nitrogen cylinder 5, a ball valve 6, a polytetrafluoroethylene tube 7, a sample bottle 8 and a cleaned microtube 9 ( figure 2) for coating. Put the suspension into the sample bottle, insert the microtube at a position 1mm away from the bottom of the sample bottle, control the nitrogen press...

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Abstract

The invention discloses a nanogold catalyst adhered to the inner wall of a microtube as well as a preparation method and an application thereof. According to the nanogold catalyst adhered to the inner wall of the microtube as well as the preparation method and the application thereof, an Au / Al2O3 catalyst is coated at the tube wall of a stainless steel microtube to form an adhered and structured catalyst microtube reactor, wherein Au is taken as a main active ingredient of the catalyst and is relatively high in load efficiency and relatively good in dispersing degree, and Al2O3 is taken as a carrier of the catalyst. When cyclohexanone and cyclohexanol are prepared by utilizing cyclohexane oxidation, the catalyst has the characteristics that the activity and the selectivity are good, and the reaction can be continuously carried out and meets requirements of industrial production.

Description

technical field [0001] The invention relates to a nano-gold catalyst adhered to the inner wall of a microtube, a preparation method and application thereof. Background technique [0002] Cyclohexanone and cyclohexanol (commonly known as KA oil) are important chemical raw materials, and millions of tons of cyclohexanone and cyclohexanol are obtained through the non-catalytic oxidation of cyclohexane every year. acid, and then synthesize nylon-6 and nylon-66, it can also be directly used as a solvent. [0003] The traditional cyclohexane oxidation process has low conversion rate and poor selectivity, and there is a safety hazard of oxidation explosion. Due to the large specific surface area of ​​microtubes and good mass and heat transfer, microtubes have good application prospects in improving gas-liquid mass transfer, improving safety, and strengthening reactions. However, there is no catalytic oxidation reaction of cyclohexane in microtubes. Although the space-time yield a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/00C07C27/14C07C29/50C07C35/08C07C45/33C07C49/403
Inventor 朱明乔刘懿王磊曲刚卢建刚陈新志何潮洪
Owner ZHEJIANG UNIV