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Nickel silicate-derived catalyst for producing xylitol by hydrogenation of xylose as well as preparation and application of nickel silicate-derived catalyst

A catalyst, nickel silicate technology, applied in catalyst activation/preparation, molecular sieve catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low xylitol selectivity, complex catalyst composition, environmental pollution, etc. problem, to achieve the effect of high xylitol selectivity, suitable for large-scale industrial application, and high metal loading

Inactive Publication Date: 2021-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN 108821940 discloses a method for efficiently transforming rice straw into xylitol, wherein NaBH 4 Reducing xylose to produce xylitol, this system needs to use a large amount of strong alkaline solution, which has the problem of environmental pollution
Gina Pecchi (RSCAdv., 2016, 6, 67817; Mole. Catal., 2017, 436, 182; Catal. Today, 2018, 310, 59) reported a class of nickel-based xylose hydrogenation with perovskite salt as precursor The xylitol catalyst system has a high reactivity of the catalyst, which to a certain extent inhibits the loss of nickel species in the three-phase reaction system, but the catalyst composition is complex and the xylitol selectivity is low, not exceeding 60%. The separation and purification of the product poses a big problem

Method used

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  • Nickel silicate-derived catalyst for producing xylitol by hydrogenation of xylose as well as preparation and application of nickel silicate-derived catalyst
  • Nickel silicate-derived catalyst for producing xylitol by hydrogenation of xylose as well as preparation and application of nickel silicate-derived catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Preparation and Application of 50Ni / SBA-15-EA Catalyst

[0046] 24.8g Ni(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, and high-purity ammonia gas was pulsed into the above solution. After the pH of the system no longer increased, the ammonia gas was stopped, and the obtained solution system was stirred for 20 minutes. Weigh 5g of SBA-15 powder into the solution and stir for 4h at room temperature. The uniformly stirred mixture system was transferred to a water bath at 80°C, and the ammonia gas in the mixture was continuously stirred to remove it. After the pH of the system was reduced to nearly neutral, the mixture was removed from the water bath to cool down. After the system was cooled to room temperature, filter cake was obtained by filtration. After washing the filter cake with deionized water for 5 times, the filter cake was dried at 120°C for 12h, then roasted at 650°C for 4h, and reduced in a hydrogen atmosphere at 500°C for 2h. The catalyst is designa...

Embodiment 2

[0049] 30Ni / SiO 2 - Preparation and application of EA catalyst

[0050] 10.6g Ni(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to obtain solution A. Prepare 0.5M Na 2 CO 3 solution, solution B. Weigh 5g of SiO produced by Shandong Ocean Chemical 2 The powder was added to the solution to obtain Suspension C. Heat C to 50°C, and under constant temperature stirring, add A and B into the system simultaneously and at a constant speed to keep the pH of the system constant. After the dropwise addition was completed, the stirring aging treatment was continued for 2 h at this temperature. The system was cooled to room temperature, and filtered to obtain a filter cake. After washing the filter cake with deionized water for 5 times, the filter cake was dried at 120°C for 12h, then roasted at 700°C for 4h, and reduced in a hydrogen atmosphere at 600°C for 2h. The catalyst is designated as B. Sample B was characterized by XRD ( figure 1 ), proving that the nickel component...

Embodiment 3

[0053] Preparation and Application of 5Ni / MCM-41-EA Catalyst

[0054] 1.3g Ni(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, 15 g of urea was added, and the obtained solution system was stirred for 20 min. Weigh 5g of MCM-41 powder into the solution and stir at room temperature for 2h. The reaction system was heated to 50°C, and the urea was decomposed slowly under stirring, and the temperature of the mixture was lowered after the pH of the system was lowered to near neutral. After the system was cooled to room temperature, filter cake was obtained by filtration. After washing the filter cake with deionized water for 5 times, the filter cake was dried at 120°C for 12h, then roasted at 450°C for 4h, and reduced in a hydrogen atmosphere at 400°C for 2h. The catalyst is designated as C. Sample C was characterized by XRD ( figure 1 ), proving that the nickel component in the sample exists in the form of nickel phyllosilicate (nickel phyllosilicate, layered nickel silica...

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Abstract

The invention relates to a nickel silicate-derived catalyst for producing xylitol by hydrogenation of xylose as well as preparation and application of the nickel silicate-derived catalyst. The catalyst is composed of a metal nickel component and a carrier, wherein the metal nickel exists in the form of layered nickel silicate; and the carrier is a silicon oxide-containing inorganic carrier such as SiO2, HMS, MCM-41, SBA-15, ZSM-5, silicon oxide aerosol or the like. The catalyst is prepared through a uniform deposition-precipitation method which is an ammonia evaporation induced deposition-precipitation method, a urea decomposition induced deposition-precipitation method or a deposition-precipitation method using carbonate as a precipitant specifically, wherein the carbonate comprises sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate. The catalyst disclosed by the invention is used for catalyzing a reaction for producing xylitol through hydrogenation of xylose, and the catalyst has high xylose conversion activity and high xylitol selectivity; the preparation method of the catalyst is simple and convenient; requirements on equipment required by raw material storage and catalyst preparation are low; large-scale amplification application is easy; and the catalyst has a good industrial application prospect.

Description

technical field [0001] The invention relates to a catalyst for producing xylitol by hydrogenation of xylose derived from nickel silicate and a preparation method thereof, belonging to the technical field of biomass conversion and catalysis. Background technique [0002] The increasingly serious contradiction between energy supply and demand and increasingly stringent environmental protection requirements have promoted the research on the conversion and utilization of renewable biomass resources. China is the largest agricultural producer in the world, but the high-value utilization of agricultural and forestry waste is very limited. Xylose is a carbon-containing chemical derived from woody biomass such as agricultural and forestry residues. High value-added xylitol can be prepared by hydrogenation of xylose. Xylitol is a healthy sweetener, its sweetness is equivalent to that of sucrose, but its calories are only one-third of that of sucrose, and the metabolism of xylitol d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J29/03B01J35/00B01J37/03B01J37/18C07C29/141C07C31/18
CPCB01J23/755B01J29/0333B01J37/035B01J37/18C07C29/141B01J35/394C07C31/18
Inventor 张宗超杜虹马秀云
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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