Carbon-based solid acid catalyst and preparation method thereof

A carbon-based solid acid and catalyst technology, which is used in catalyst activation/preparation, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of weak acidity and high cost, and achieve low production cost, low price and high mechanical strength. Effect

Inactive Publication Date: 2012-05-23
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that these solid acids have high catalytic activity, and the products are easy to separate and clean and environmentally friendly. The disadvantages are weak acidity and high cost.

Method used

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  • 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

[0023] Add 0.075mol p-aminobenzenesulfonic acid and 187ml, 1mol / l hydrochloric acid into the three-necked flask to form a reaction system, turn on the electromagnetic stirring, control the temperature of the reaction system at 4°C with an ice-water bath, and use a separatory funnel in the reaction system Slowly add 80ml, 1mol / l sodium nitrite solution, stir and react for 30min to obtain a white precipitate, diazonium benzenesulfonate, wash the diazonium benzenesulfonate with distilled water, filter and set aside.

[0024] The chemical reaction formula of the reaction system is as follows:

[0025]

[0026] Then, 1.5 g of activated carbon, 100 ml of absolute ethanol, 100 ml of distilled water, and 400 ml of 50 wt % hypophosphorous acid and the prepared diazonium benzenesulfonate were added to the three-necked flask for 90 minutes of reaction.

[0027] The chemical reaction formula of the reduction reaction is as follows:

[0028]

[0029] The activated carbon was washed ...

Embodiment 2

[0032] Add 0.075mol of p-aminobenzenesulfonic acid and 187ml of 1mol / l hydrochloric acid into the three-necked flask to form a reaction system, turn on the electromagnetic stirring, control the temperature of the reaction system at 2°C with an ice-water bath, and use a separatory funnel in the reaction system Slowly add 80ml, 1mol / l sodium nitrite solution, stir and react for 60min to obtain a white precipitate, diazonium benzenesulfonate, wash the diazonium benzenesulfonate with distilled water, filter and set aside. The chemical reaction formula of reaction system is the same as embodiment 1.

[0033] Then, 1.5 g of activated carbon, 100 ml of absolute ethanol, 100 ml of distilled water, and 400 ml of 50 wt % hypophosphorous acid and the prepared diazonium benzenesulfonate were added to the three-necked flask for 90 minutes of reaction. The activated carbon was washed with distilled water and acetone, and dried in an oven at 120°C for 12 hours to obtain a carbon-based solid ...

Embodiment 3

[0036] Add 0.075mol p-aminobenzenesulfonic acid and 187ml, 0.5mol / l sulfuric acid into the three-necked flask to form a reaction system, turn on the electromagnetic stirring, control the temperature of the reaction system at 2°C with an ice-water bath, and use a separatory funnel in the reaction system Slowly add 80ml, 1mol / l potassium nitrite solution, and stir for 90min to obtain a white precipitate, diazonium benzenesulfonate. Wash the diazonium benzenesulfonate with distilled water and filter for later use. The chemical reaction formula of reaction system is the same as embodiment 1.

[0037] Then, 2.0 g of activated carbon, 100 ml of absolute ethanol, 100 ml of distilled water, 400 ml of 50 wt % hypophosphorous acid and the prepared diazonium benzenesulfonate were added to the three-necked flask, and reacted for 120 min. Wash with distilled water and acetone, and dry in an oven at 120° C. for 12 hours to obtain a carbon-based solid acid catalyst. The chemical reaction fo...

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Abstract

The invention discloses a carbon-based solid acid catalyst and a preparation method thereof. The prepared catalyst adopts activated carbon as carrier and benzenesulfonic acid as acid site which are combined through firm carbon-carbon covalent bond. The preparation method comprises the following steps: first adopting aminobenzene sulfonic acid to perform diazotization process, obtaining diazosalt of sulfanilic acid, then using hypophosphorous acid as reductant to react with diazosalt of sulfanilic acid on activated carbon, and finally filtrating, washing and drying the products after finishingthe reaction to obtain the carbon-based solid acid catalyst. The carbon-based solid acid catalyst has the advantage of stable structure, strong acidity, low cost, good catalytic effect and environmental-friendliness and can be reproducible and reused.

Description

technical field [0001] The invention relates to a catalyst and its preparation, in particular to a carbon-based solid acid catalyst and its preparation method. Background technique [0002] Traditional homogeneous acid catalysts such as sulfuric acid, phosphoric acid, aluminum trichloride, etc. are widely used in chemical production processes such as alkylation, esterification, hydrolysis, hydration, etc., and the annual consumption of sulfuric acid as a catalyst exceeds 15 million tons (Hara, M, et al. Angew Chem Int Ed, 2004, 43:2955-2958). The advantages of these homogeneous acids are low cost, strong acidity, and high catalytic efficiency, but there are also many disadvantages, such as easy corrosion of equipment, difficulty in separating the catalyst from the reaction system, difficulty in recycling, and easy environmental pollution. [0003] Under the current background of advocating green chemistry and sustainable development, solid acid materials with high catalytic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02B01J37/16C07C67/08C07C69/14C07C69/24
Inventor 高锦明汪小红马海龙张增强
Owner NORTHWEST A & F UNIV
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