TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: Naphtha gas comprising hydrogen, methane, and carbon dioxide is produced from a mixed gas stream comprising methane and carbon dioxide by separating the mixed gas stream into two mixed gas streams. Methane is separated from the first mixed gas stream, and separating the purified methane gas into two methane gas streams. The methane in the first methane gas stream is converted into carbon dioxide and hydrogen to obtain a hydrogen-bearing gas stream which is combined with the second methane gas stream and the second mixed gas stream to produce the naphtha gas stream. The mixed gas stream is collected from a landfill. The mixed gas stream is free of volatile organic compounds and hydrogen sulfide. Methane is separated from the first mixed gas stream by passing the first mixed gas stream through a pressure swing adsorption separation system, a liquid adsorbent bed that adsorbs carbon dioxide, or a permeable membrane. Methane is converted into carbon dioxide by passing the first methane gas stream through a hydrogen reformer. It is converted into carbon dioxide and hydrogen by passing the first methane gas stream through a hydrogen reformer at 600-900 degrees C, and passing effluent gas stream from the hydrogen reformer through a shift reactor. The effluent gas is cooled at 260-430 degrees C before it is passed through the shift reactor. The hydrogen-bearing gas stream further comprises water is preferably removed prior to mixing the hydrogen-bearing stream with the second methane gas stream and the second mixed gas stream. The mixed gas stream has a flow rate of 1-15 million standard cubic feet per day. Naphtha gas is produced having a flow rate of 1-15 million standard cubic feet per day. The mixed gas stream may also comprise contaminants which are removed by passing the landfill or mixed gas over an adsorbent column comprising activated carbon bed.Preferred Composition: The mixed gas stream comprises at least 40 vol.% of the mixed gas stream. The first mixed gas stream comprises 70 or 40% of the total volume of the mixed gas stream, and up to 30 or 60% of the total volume of the mixed gas stream is used to form the second mixed gas stream, respectively. The hydrogen-bearing gas stream comprises at least 70 vol.% hydrogen. The naphtha gas comprises 40-60 vol.% hydrogen, 20-40 vol.% methane and 10-30 vol.% carbon dioxide.