N‐Doped Defective Graphene from Biomass as Catalyst for CO2 Hydrogenation to Methane

N‐doped, defective graphene obtained by pyrolysis of chitosan at 900 °C under Ar exhibits catalytic activity for the Sabatier hydrogenation of CO2 to CH4 at temperatures about 500 °C with estimated turnover frequencies and activation energy values of 73.17 s−1 and 24.3 kcal×mol−1, respectively. It has been found that this enhanced catalytic activity compared to other related doped defective graphenes derives from the presence of pyridinic N atoms that adsorbs CO2 forming carbamate‐type adsorbates. Defective graphenes obtained from biomass waste were used to promote the selective hydrogenation of CO2 to methane. The catalytic activity of these materials is notably improved by N doping.