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High-activity Ni/ACP catalyst and preparation method and application thereof

A catalyst, high activity technology, used in catalyst activation/preparation, physical/chemical process catalysts, catalysts, etc., can solve problems such as low catalytic activity, unfavorable metal dispersion, and small catalyst specific surface area.

Active Publication Date: 2021-07-30
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported nickel-carbon catalysts prepared by in-situ synthesis and pyrolysis reduction from raw materials such as glucose have low catalytic activity. On the one hand, the specific surface area of ​​the catalyst is small, which is not conducive to the dispersion of metals. During the process, the active metal will be coated, reducing the active metal on the surface

Method used

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  • High-activity Ni/ACP catalyst and preparation method and application thereof
  • High-activity Ni/ACP catalyst and preparation method and application thereof
  • High-activity Ni/ACP catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: the preparation of catalyst Ni / ACP

[0030] 1. Preparation of activated carbon carrier (ACP) from cellulose

[0031] First, 18 g of cellulose powder was placed in a high-temperature tube furnace under a nitrogen atmosphere with a flow rate of 200 mL / min, heated from room temperature to 650 °C at a heating rate of 10 °C / min, and carbonized at 650 °C for 2 h. to prepare coke. After completion of carbonization, the obtained coke was ground into powder and mixed thoroughly with potassium hydroxide (KOH), the mass ratio of KOH to coke was 3:1, and the mixture was put into a tube furnace with a nitrogen atmosphere at a flow rate of 200 mL / min In the process, heating from room temperature to 700°C at a heating rate of 10°C / min, and activation treatment at 700°C for 2h. After the activation is completed, wash the product with the prepared 2mol / L dilute hydrochloric acid solution, and then continue washing with deionized water until the filtrate is neutral. Fina...

Embodiment 2

[0047] Embodiment 2: Application of catalytic hydrogenation of diphenyl ether

[0048] All catalytic reactions were performed in a 100 mL stainless steel autoclave.

[0049] The substrate diphenyl ether (100 mg), catalyst (50 mg) and isopropanol (20 mL) were placed in the reactor. After sealing, the residual air was removed by bubbling hydrogen 3 times. Subsequently, the reactor was pressurized to the desired pressure (1.0 MPa) with hydrogen at room temperature. The temperature was then raised to the desired reaction temperature (140° C.) and maintained for a certain time (120 min) at a vigorous stirring speed of 800 rpm. After the experiment, the reaction system was naturally cooled to room temperature and the pressure was released. The reaction mixture was filtered to remove the catalyst, and the obtained organic phase was analyzed by mass spectrometry (GC-MS) and gas phase (GC).

[0050] Table 2 The hydrogenation catalytic performance of different catalysts to diphenyl ...

Embodiment 3

[0053] Embodiment 3: the influence of reaction temperature on diphenyl ether conversion

[0054] Reaction procedure is the same as embodiment 2, and difference is reaction conditions: 100mg diphenyl ether, 20mL Virahol, 50mg Ni / ACP catalyst, 1MPa H 2 , 2h.

[0055] Depend on Figure 5 It can be seen that the conversion rate of diphenyl ether catalyzed by Ni / ACP catalyst increases gradually with the increase of reaction temperature, and only at 160 °C, the conversion rate reaches the maximum value of 100%, and then remains unchanged. At a lower reaction temperature, the product distribution is wider, and the yield of cyclohexane and cyclohexanol in the product increases gradually with the increase of the reaction temperature. At 180 ° C, a higher yield of cyclohexane and cyclohexanol is obtained. Cyclohexanol.

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Abstract

The invention discloses a high-activity Ni / ACP catalyst and a preparation method and application thereof.Cellulose powder is selected as a raw material and subjected to carbonization and alkali activation to prepare a carrier ACP, then metal nickel is loaded on the carrier ACP through an impregnation method, and the high-activity Ni / ACP catalyst is obtained. The nickel-carbon catalyst shows excellent catalytic performance in catalytic hydrogenation of diphenyl ether and other lignin model compounds, C-O bonds in reactants can be effectively cracked, and finally the lignin model compounds are converted into high-added-value small-molecule chemicals and fuels.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a highly active Ni / ACP catalyst and its preparation method and application. Background technique [0002] Due to the depletion of fossil fuels and increasing concerns about environmental pollution, how to effectively utilize renewable resources has attracted much attention. It is well known that lignin is a three-dimensional highly branched aromatic biopolymer composed of methoxylated phenylpropane units with a large number of ether C-O bonds, mainly 4-O-5, α-O-4 and beta-O-4. Therefore, efficient cleavage of ether C–O bonds is one of the most important steps in the production of low-carbon chemicals from lignin. However, it is difficult to crack lignin due to the high bond dissociation energy (BDE). Currently, there are many strategies for lignin depolymerization, such as pyrolysis, hydrolysis, oxidation, and hydrogenolysis. Among them, the hydrogenolysis reacti...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/10B01J37/08B01J37/02B01J37/18C07C1/22C07C15/04C07C13/18C07C37/00C07C39/04C07C29/19C07C35/08
CPCB01J23/755B01J37/084B01J37/0207B01J37/088B01J37/18C07C1/22C07C37/002C07C29/19C07C2523/755C07C2601/14B01J35/393B01J35/23B01J35/399B01J35/618B01J35/635B01J35/643C07C15/04C07C39/04C07C35/08C07C13/18Y02P20/52
Inventor 曹景沛江玮解金旋赵小燕赵亮张创冯晓博刘天龙
Owner CHINA UNIV OF MINING & TECH
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