Supported bimetallic carbon-silicon composite catalyst and preparation method and application thereof

A carbon-silicon composite and catalyst technology, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds, can solve problems such as expensive separation processes, toxic acid waste, and equipment corrosion, and achieve high catalytic activity and equipment The effect of low requirements and low cost

Active Publication Date: 2019-07-05
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commercially, it is mainly produced by the toluene chlorination / hydrolysis process, which generates large amounts of toxic acid waste and causes equipment corrosion and expensive separation processes

Method used

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  • Supported bimetallic carbon-silicon composite catalyst and preparation method and application thereof
  • Supported bimetallic carbon-silicon composite catalyst and preparation method and application thereof
  • Supported bimetallic carbon-silicon composite catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] (1) Rice husk crushing: rice husk is washed with water, dried, crushed, and sieved to obtain rice husk powder with a particle size of 90nm;

[0030] (2) Rice husk acid treatment: The rice husk powder was refluxed in the reaction kettle with a solid-to-liquid ratio of 1:10 and a hydrochloric acid solution with a mass fraction of 10% for 2 h, and the reflux product was washed with deionized water, and dried overnight at 105°C to obtain Acid-treated rice husk powder;

[0031] (3) Pyrolytic carbonization of rice husk: put the acid-treated rice husk powder in a quartz tube, put it into a tube furnace for pyrolytic carbonization at 500 °C, and raise the temperature from 20 °C to 500 °C at a rate of 5 °C / min. ℃, keep for 2 h, and transfer to the carbon-silicon composite support;

[0032] (4) Functionalization: Dissolve the carbon-silicon composite carrier in toluene in a narrow-mouth bottle at a solid-to-liquid ratio of ...

Embodiment 2

[0037] This embodiment includes the following steps:

[0038] (1) Rice husk crushing: rice husk is washed with water, dried, crushed, and sieved to obtain rice husk powder with a particle size of 80nm;

[0039] (2) Rice husk acid treatment: The rice husk powder was refluxed in the reaction kettle with a solid-to-liquid ratio of 1:10 and a hydrochloric acid solution with a mass fraction of 10% for 2 hours, and the reflux product was washed with deionized water (supplementary temperature 105°C) Drying in an oven to obtain acid-treated rice husk powder;

[0040] (3) Pyrolytic carbonization of rice husk: Put the acid-treated rice husk powder in a quartz tube and put it into a tube furnace for pyrolytic carbonization at 600 °C (from 20 °C to 600 °C at a rate of 5 °C / min. ℃, keep for 2 h. Supplementary time or other process conditions), to the carbon-silicon composite support;

[0041] (4) Functionalization: Dissolve the carbon-silicon composite carrier in toluene at a solid-to-li...

Embodiment 3

[0045] This embodiment includes the following steps:

[0046] (1) Rice husk crushing: rice husk is washed with water, dried, crushed, and sieved to obtain rice husk powder with a particle size of 70nm;

[0047] (2) Rice husk acid treatment: reflux the rice husk powder in a reaction kettle with a solid-to-liquid ratio of 1:10 and a hydrochloric acid solution with a mass fraction of 10% for 2 h, wash the reflux product with water, and dry to obtain acid-treated rice husk;

[0048] (3) Pyrolytic carbonization of rice husk: put the acid-treated rice husk in a quartz tube, put it into a tube furnace at 700°C for pyrolytic carbonization, and raise the temperature from 20°C to 700°C at a rate of 5°C / min , keep for 2 h. , to obtain a carbon-silicon composite carrier;

[0049] (4) Functionalization: Dissolve the carbon-silicon composite carrier in toluene in a narrow-mouthed bottle at a solid-to-liquid ratio of 1:9, and then add functionalized carrier 3-aminopropyltriethyl, which is ...

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Abstract

Provided are a supported bimetallic carbon-silicon composite catalyst and a preparation method and application thereof. The preparation method of the supported bimetallic carbon-silicon composite catalyst comprises the following steps of (1) rice husk breaking; (2) rice husk acid treatment; (3) rice hull pyrolysis carbonization; (4) functionalization; (5) metal loading. The catalyst is based on the concept of green chemistry, a biomass resource rice husk is utilized as the raw material of a catalyst carrier, the raw material is easy to obtain and cheap, the preparation process does not involvehigh temperature and high pressure, the reaction condition is mild, the requirement for equipment is low, and the energy consumption is greatly reduced; the catalyst preparation process is green, environmentally friendly, low-cost and reusable; (2) the prepared supported bimetallic carbon-silicon composite catalyst is applied to a benzene-methanol solvent-free selective oxidation catalytic reaction without involving other organic solvents, and is green and pollution-free; the catalyst is easy to recycle, reusableand high in catalytic activity.

Description

technical field [0001] The invention relates to a carbon-silicon composite catalyst and its preparation method and application, in particular to a supported bimetallic carbon-silicon composite catalyst and its preparation method and application. Background technique [0002] Rice husk is an inexpensive agricultural residue consisting of 20% ash, 38% cellulose, 22% lignin, 18% pentose sugars and 2% other organic components, and its annual production is as high as 140 million tons , usually burned or discarded. Human activities such as the production and consumption of fossil fuels and agricultural and industrial activities lead to increased concentrations of greenhouse gases in the atmosphere. The shortage of fossil fuels and the environmental problems of energy sources have created an urgency to develop clean and renewable energy sources. Therefore, many countries have proposed plans to reduce carbon dioxide emissions and fossil energy consumption. Biomass is one of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C45/38C07C47/54
CPCB01J27/24C07C45/38C07C47/54Y02P20/584
Inventor 喻宁亚张梦丽
Owner HUNAN NORMAL UNIVERSITY
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