The document discusses a catalytic process called catalytic pressure-less depolymerization (CPD) that converts polymers and long chain hydrocarbons into short-chain hydrocarbons similar to diesel fuel. The CPD process uses ion-exchanging catalysts to break down biomass sources like wood, plastics, and waste materials into synthetic diesel at temperatures between 270-350°C without producing pollutants. The resulting synthetic diesel has similar efficiency and quality to conventional diesel but is more environmentally friendly as it doesn't require additives like catalysts.