Introduction; 1 Thermocatalytic Conversion of CO2; 1.1 Motivation and General Background; 1.2 Conversion Pathways and Major Challenges; 1.3 Catalysis and Catalyst Deactivation; 1.4 Reactor and System Design; 1.5 Methane Dry Reforming; 1.6 Methanol Synthesis via CO2 Hydrogenation; 1.7 Reverse Water Gas Shift Reaction; 1.8 Sabatier Reaction, Power-to-Gas and Renewable Natural Gas; 1.9 Future Perspectives; References; 2 Electrocatalytic Reduction of CO2; 2.1 Basics of Electrochemical Reduction of CO2; 2.2 Fundamental Challenges; 2.3 Catalysis for Electrochemical Reduction of CO2

2.4 Electrochemical Cell Design2.5 Methanol Synthesis; 2.6 Syngas Production in Solid Oxide Fuel Cells; 2.7 Concluding Remarks; References; 3 Photocatalytic Reduction of CO2; 3.1 Basic Principles; 3.2 Main Drawbacks; 3.3 Photocatalysis for CO2 Conversion; 3.4 Photochemical Reactor Design; 3.5 Operational Constraints and Feasibility of Practical Operations; References; 4 Biological Conversion of CO2; 4.1 Biological Fixation of CO2 Using Microorganisms; 4.2 Synthetic Biology; 4.3 Biological Electrofuels; 4.4 Biological Hydrogenation of CO2; 4.5 Challenges and Opportunities; References