Method for preparing sulfonated carbon nanotube solid acid catalyst with attapulgite as template

The invention discloses a method for preparing a sulfonated carbon nanotube solid acid catalyst with attapulgite as a template. The method comprises the following steps: crushing attapulgite mineral, rolling the crushed attapulgite mineral, acidifying the rolled attapulgite mineral, carrying out pumping filtration on the acidified attapulgite mineral, washing the filtered attapulgite mineral with water, and freeze-drying the washed attapulgite mineral to obtain acidified attapulgite; carrying out vapor deposition on the acidified attapulgite to load furfuryl alcohol, charring the loaded acidified attapulgite, etching the charred acidified attapulgite to remove an attapulgite template, washing the obtained product with water, and drying the washed product to obtain amorphous carbon nanotubes; and processing the amorphous carbon nanotubes with concentrated sulfuric acid, washing the processed amorphous carbon nanotubes with water, and drying the washed amorphous carbon nanotubes to obtain the sulfonated carbon nanotube solid acid catalyst. The preparation method has the advantages of simplicity, low cost, and facilitation of a sulfonyl group due to low temperature incomplete charring of furfuryl alcohol, and the obtained sulfonated carbon nanotubes have high specific surface area and catalysis activity and good application prospect.