The cycle described here for producing H 2 gas from MSW involves four chemical processes operating continuously. Table lists the primary chemical reactions that take place at each step, using cellulose as an example feedstock, but it should be noted that other reactions and chemical intermediates are possible depending on starting feedstock and reaction conditions. The rationale for each of the four steps in the process will be discussed in detail in the next four sections respectively along with technical considerations and thermodynamic analysis.