Carbon-based solid acid catalyst and preparation method thereof

A carbon-based solid acid and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., to achieve increased specific surface area, high catalytic activity, and thermal stability good sex effect

Inactive Publication Date: 2012-07-25
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Coal is structurally a supramolecular system composed of carbon condensed rings with supramolecular characteristics, but ordinary coal species are limited as raw materials for carbon-based solid acids due to their high ash content.

Method used

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  • Carbon-based solid acid catalyst and preparation method thereof
  • Carbon-based solid acid catalyst and preparation method thereof
  • Carbon-based solid acid catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The first step, the preparation of the precursor of the modified coal: crush 20 g of Taixi coal with an ash content of 3.5% until it passes through a 200 mesh sieve, put it into a polytetrafluoroethylene beaker, and measure it according to the ratio of 30:4:4:15 Add distilled water, hydrofluoric acid with a mass concentration of 40%, perchloric acid with a mass concentration of 99%, and hydrochloric acid with a mass concentration of 36%, and stir evenly at room temperature for 24 hours, filter, wash with water until neutral, and store at 120 Drying at ℃, the measured ash content is 0.61%;

[0017] The second step, compounding: mix the deashed Taixi coal, sodium humate as a binder, calcium oxide as a pore-forming agent, and distilled water in a mass ratio of 100:25:8:40 Evenly, after natural air-drying, put it in an oven and bake at 120°C for 2 hours, cool to room temperature, and then grind to below 200 mesh for later use;

[0018] The third step, carbonization: put 20...

Embodiment 2-7

[0022] On the basis of the process steps in the above-mentioned Example 1, step 1: the preparation conditions of the modified coal precursor are changed, and the process technical conditions of other steps remain unchanged, and the examples 2-6 are shown in the following table.

[0023]

[0024] The unit of the ash content of raw coal in the above-mentioned embodiment is mass percentage, and the amount of coal, water, hydrofluoric acid, perchloric acid, hydrochloric acid is to measure by weight, and the concentration of hydrofluoric acid, perchloric acid, hydrochloric acid is identical with embodiment 1, The unit of temperature is °C, the unit of time is hour, and the unit of product acid value is mmol / g.

Embodiment 7-12

[0026] On the basis of any of the above-mentioned embodiments of 2-6, only the process conditions in the carbonization and sulfonation steps are changed, and the specific implementation methods are shown in the following table on the basis that the conditions of other steps are constant;

[0027]

[0028] With the charcoal-based solid acid catalyst that above-mentioned embodiment obtains, the specific implementation mode that is used to catalyze ketal (aldehyde) reaction is as follows:

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Abstract

The invention relates to preparation of a catalyst, in particular to a carbon-based solid acid catalyst and a preparation method thereof. The carbon-based solid acid catalyst has a pore size distribution of 3-50nm, a BET (Brunauer, Emmett and Teller) specific surface of 40-80m<2> / g and an acid value of 0.82-1.52mmol / g. The carbon-based solid acid catalyst is used for thermally decomposing granular carbon-based sulfonic acid under the temperature at 300 DEG C. The preparation method for preparing the carbon-based solid acid catalyst according to claim 1 is characterized by comprising the following steps of: preparing a modified coal precursor; preparing a compounding raw material; and carbonizing and sulfonating to obtain the solid acid catalyst. The carbon-based solid acid catalyst provided by the invention has the advantages that the preparation process is simple; the adopted raw materials are low in cost and easily obtained; based on a lyophobic amorphous carbon structure which is obtained by calcining an ultralow ash Taixi coal compound, a sulfo group is connected, and thus the carbon-based solid acid catalyst has porosity characteristic, developed mesopores, increased specific surface area and excellent heat stability; and the catalytic activity of the carbon-based solid acid catalyst is higher than that of the traditional acid catalyst, and the carbon-based solid acid catalyst is reusable and easy to be recovered.

Description

Technical field [0001] The invention relates to the preparation of a catalyst, in particular to a carbon-based solid acid catalyst and a preparation method thereof. Background technique [0002] In recent years, the preparation and application of solid carbon sulfonic acid catalysts have attracted the attention of academic circles. People have developed a variety of solid carbons obtained from polycyclic aromatic hydrocarbons, sugars (such as glucose, etc.), natural substances (such as wood, walnuts, millet, and lignin, etc.) through partial carbonization and sulfuric acid sulfonation. Sulfonic acid, and has a good catalytic effect in some fine organic synthesis and biomass conversion. However, the materials obtained by these methods are limited by the source of the carbon source matrix, or the source of the raw material is expensive, and it is a powdery soft material with a dense structure on the surface, underdeveloped pore size and difficult to control, and the acidity i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J21/18B01J35/10
Inventor 刘万毅梁世娇李冰陈晓燕张霞蔡磊胡奇林
Owner NINGXIA UNIVERSITY
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