Ruthenium and nickel/activated carbon co-loaded catalyst and preparation and application thereof

A supported catalyst and activated carbon technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, hydroxyl compound preparation, etc., can solve the problems of complex preparation methods, low catalytic efficiency, and low catalytic efficiency, and achieve simple preparation methods , fast adsorption speed and large specific surface area

Inactive Publication Date: 2019-02-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN105859522 discloses a preparation process of a series of sugar alcohols such as sorbitol, mannitol, xylitol, arabitol, and galactitol. The process uses formate as a hydrogen donor and uses a general-purpose noble metal catalyst. Hydrogenation of a series of monosaccharides under mild conditions, but the highest conversion rate of the catalyst is 88.1%, the highest sugar alcohol yield is 78.4%, the catalytic efficiency is not high, and the selectivity is poor
[0005] To sum up, the current catalysts used in the sugar alcohol production process have problems such as complex preparation methods, high preparation costs, low catalytic efficiency, and poor versatility.

Method used

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  • Ruthenium and nickel/activated carbon co-loaded catalyst and preparation and application thereof
  • Ruthenium and nickel/activated carbon co-loaded catalyst and preparation and application thereof
  • Ruthenium and nickel/activated carbon co-loaded catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the preparation of Ru-Ni / AC catalyst

[0025] (1) Pretreatment of activated carbon: 5.0 g of activated carbon was added to a 250 mL round-bottomed ground flask, and then 100 mL of 30% nitric acid solution was added. Place the flask in a water-bath thermostat, install a reflux condenser on it, turn on the power, set the water-bath thermostat to 90°C, and reflux at a constant temperature for 3 hours. After the constant temperature was finished, it was cooled to room temperature, then washed with distilled water until the pH of the filtrate was neutral, and dried at 60° C. under vacuum for 12 hours.

[0026] (2) Preparation of Ru-Ni / AC catalyst by impregnation reduction method: add 50mL ethanol and 50mL ultrapure water into a 250mL round bottom flask, add 1.0g nitric acid treated activated carbon, 0.10-0.20g (preferably 0.14g) trichloro Ruthenium chloride, 0.05-0.10g (preferably 0.08g) nickel dichloride hexahydrate, ultrasonically disperse the above mixed so...

Embodiment 2

[0027] Embodiment 2: the conversion rate of sugar and the selective detection method of sugar alcohol

[0028] Take 20 μL of the reactant before the sealed reactor and the product after the hydrogenation reaction, dilute to 1 mL with ultrapure water, and detect the sugar concentration in the reactant, the residual sugar concentration and the sugar alcohol concentration in the product by high performance liquid chromatography .

[0029] The high-performance liquid chromatographic instrument used for detection is a waters system 2414 differential detector, and the chromatographic column is an AminexHPX-87H column (300 × 7.8mm), and the mobile phase is 5mM H 2 SO 4 , flow rate 0.6mL / min, column temperature: 60.0°C, injection volume: 20μL.

[0030] The conversion rate of sugar and the selectivity calculation formula of sugar alcohol are as follows:

[0031]

[0032]

Embodiment 3

[0033] Embodiment 3: Preparation of xylitol by hydrogenation of xylose

[0034]

[0035] Weigh 10.0g of anhydrous xylose, add it to 40mL ultrapure water, prepare a xylose solution with a mass fraction of 20%, transfer the xylose solution to a 100mL reactor, add 1.0g of Ru-Ni / AC catalyst, and seal the reaction kettle. The reactor was replaced three times with nitrogen, and the air in the reactor was removed. Adjust the temperature of the reactor to 110° C., and the stirring speed to 500 rpm. After the temperature is stabilized, hydrogen gas is charged to 4.0 MPa to start the reaction. After reacting for 90 minutes, the reactor was rapidly cooled, and when the temperature dropped to room temperature, the hydrogen gas was vented to end the hydrogenation reaction.

[0036] Using the method of Example 2 to detect, the conversion rate of xylose is 99.8%, and the selectivity of xylitol is 99.0%.

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Abstract

The invention relates to a ruthenium and nickel / activated carbon co-loaded catalyst, a preparation method thereof and application of the ruthenium and nickel / activated carbon co-loaded catalyst to preparation of sugar alcohols by sugar through catalytic hydrogenation. Through a simple impregnation reduction method, metal ruthenium and nickel are co-loaded to activated carbon with the high adsorption speed and large specific surface area to prepare the Ru-Ni / AC catalyst, and the Ru-Ni / AC catalyst is applied to preparation of the series of sugar alcohols such as xylitol, arabitol, sorbitol, mannose and maltol. The catalyst is high in activity, good in stability, capable of being reused in multiple batches, and high in product yield. In a word, the catalyst is simple in preparation process, low in production cost, high in catalytic efficiency, good in stability, suitable for the preparation process of the multiple sugar alcohols, and good in universality.

Description

(1) Technical field [0001] The invention relates to a ruthenium-nickel / activated carbon co-supported catalyst, its preparation method and its application in the preparation of sugar alcohol by catalytic hydrogenation of sugar. (2) Background technology [0002] Functional sugar alcohols have important applications in the fields of food, beverages, health products, and special foods because of their moderate sweetness, low calorific value, no influence on insulin secretion, and no fluctuations in blood sugar. Using transition metal catalysts, hydrogenation reduction of sugars under high temperature and high pressure conditions is the main production method of sugar alcohols. Among them, the performance and cost of the catalyst are the key factors restricting the production of sugar alcohols. [0003] Patent CN102886260A discloses a composite palladium ruthenium / multi-walled carbon nanotube catalyst prepared by impregnation reduction method. The electrochemical performance te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/02B01J37/16C07C29/141C07C31/26C07H1/00C07H15/04
CPCB01J23/892B01J37/0201B01J37/16C07C29/141C07C31/26C07H1/00C07H15/04
Inventor 柳志强张晓健郑裕国李海伟金利群
Owner ZHEJIANG UNIV OF TECH
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