Method for preparing expanded graphite carbon-based solid acid catalyst
A solid acid catalyst, carbon-based solid acid technology, applied in the preparation of organic compounds, carboxylic acid ester preparation, chemical instruments and methods, etc., can solve the problems of waste liquid treatment, environmental pollution, difficult recycling and other problems, and achieve the goal of preparing The method is simple, easy for industrial production, and the effect of good catalytic conversion performance of glycolic acid
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Embodiment 1
[0028] In this example, the expanded graphite is placed in a 2.5 mol / L sulfuric acid solution, and after a hydrothermal reaction at 200°C for 10 h, the acid catalytic performance is evaluated. The specific operation steps are as follows:
[0029] (1) Mixing: Add 1.0 g of expanded graphite to 60 mL of 2.5 mol / L sulfuric acid solution, and stir at room temperature for 1~2 h;
[0030] (2) Hydrothermal reaction: transfer the mixture of expanded graphite and 2.5 mol / L sulfuric acid solution to a hydrothermal kettle, and react at 200°C for 10 h;
[0031] (3) Washing: use a suction filtration device to wash the catalyst obtained after the hydrothermal reaction with deionized water until neutral;
[0032] (4) Drying: Dry the washed solid in an oven with an oven temperature of 80-100°C and a drying time of 8-12 h to obtain a solid acid catalyst;
[0033] (5) Evaluation of solid acid catalytic performance: 0.04 g of solid acid catalyst was added to an ethanol solution with a mass fract...
Embodiment 2
[0035] In this example, the expanded graphite is placed in a 5.0 mol / L sulfuric acid solution, and after a hydrothermal reaction at 200°C for 10 h, the acid catalytic performance is evaluated. The specific operation steps are as follows:
[0036] (1) Mixing: Add 1.0 g of expanded graphite to 60 mL of 5.0 mol / L sulfuric acid solution, and stir at room temperature for 1~2 h;
[0037] (2) Hydrothermal reaction: transfer the mixture of expanded graphite and 5.0mol / L sulfuric acid solution to a hydrothermal kettle, and react at 150°C for 4 h;
[0038] (3) Washing: use a suction filtration device to wash the catalyst obtained after the hydrothermal reaction with deionized water until neutral;
[0039] (4) Drying: Dry the washed solid in an oven with an oven temperature of 80-100°C and a drying time of 8-12 h to obtain a solid acid catalyst;
[0040] (5) Evaluation of solid acid catalytic performance: 0.04 g of solid acid catalyst was added to an ethanol solution with a mass fractio...
Embodiment 3
[0042] In this example, the expanded graphite is placed in a 7.5 mol / L sulfuric acid solution, and after a hydrothermal reaction at 200°C for 10 h, the acid catalytic performance is evaluated. The specific operation steps are as follows:
[0043] (1) Mixing: Add 1.0 g of expanded graphite and 60 mL of 7.5 mol / L sulfuric acid solution, and stir at room temperature for 1~2 h;
[0044] (2) Hydrothermal reaction: transfer the mixture of expanded graphite and 7.5 mol / L sulfuric acid solution to a hydrothermal kettle, and react at 200°C for 10 h;
[0045] (3) Washing: use a suction filtration device to wash the catalyst obtained after the hydrothermal reaction with deionized water until neutral;
[0046] (4) Drying: Dry the washed solid in an oven with an oven temperature of 80-100°C and a drying time of 8-12 h to obtain a solid acid catalyst;
[0047] (5) Evaluation of solid acid catalytic performance: 0.04 g of solid acid catalyst was added to an ethanol solution with a mass frac...
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