Researchers successfully converted corn stover into furfural using a new type of solid acid made from carbon. They tested different carbon materials and found that sucrose-derived carbon worked best. This new solid acid, called ISC-CCA, produced more furfural than other types of carbon-based solid acids. It was also reusable and achieved a high furfural yield from corn stover in a short time. This study shows that ISC-CCA is a promising catalyst for converting biomass into valuable chemicals.