Japan has declared carbon neutrality by 2050 as a government target to reduce net greenhouse gas emissions to zero by 2050. In order to substantially reduce CO2 emissions, it is important not only to control CO2 emissions through existing processes, but also to develop innovative processes to utilize CO2 as a resource for production of fuels and chemicals. The core of these efforts is technology to produce syngas, a carbon monoxide and hydrogen gas mixture, from CO2.