Ru-Mo sulfide bimetallic catalysts are disclosed for catalytic hydrothermal gasification (CHG) of aqueous stream produced from hydrothermal liquefaction of wet wastes. This catalyst is sulfur resistant and require less Ru loading compared to the current baseline catalyst, which addresses the most critical challenge for CHG. The CHG process with this catalyst converts the aqueous stream to CH4, H2, CO2, and other light hydrocarbons as well as cleaned water that can be recycled or even released into the environment.