Substitute natural gas

About: Substitute natural gas is a research topic. Over the lifetime, 1216 publications have been published within this topic receiving 23604 citations. The topic is also known as: synthetic natural gas.

Catalytic hydrothermal gasification of biomass for the production of synthetic natural gas

Abstract: xiii

Parametric Study of CO2 Methanation for Synthetic Natural Gas Production

Abstract: The production of methane by carbon dioxide hydrogenation through optimization of the operating parameters to enhance methane yield and carbon dioxide conversion in a two‐stage fixed bed reactor is investigated. The influence of temperature, gas hourly space velocity (GHSV), and H2:CO2 ratio on the production of methane is studied. In addition, different methanation catalysts in terms of metal promoters and support materials are investigated to maximize methane production. The results show that the maximum methane yield and maximum carbon dioxide conversion are obtained at a catalyst temperature of 360 °C with a H2:CO2 ratio of 4:1 and total GHSV of 6000 mL h−1 g−1catalyst and reactant GHSV of 3000 mL h−1 g−1catalyst. The optimum metal‐alumina catalyst investigated for CO2 conversion and methane yield is the 10 wt%‐Ni‐Al2O3 catalyst. However, reduction in the methane yield is observed with the addition of Fe and Co promoters because of catalyst sintering and nonuniform dispersion of metals on the support. Among the different catalyst support materials studied, i.e., Al2O3, SiO2 and MCM‐41, the highest catalytic activity is shown by the Al2O3 catalyst with 83 mol% CO2 conversion, producing 81 mol% CH4 with 98% CH4 selectivity.

Process for the generation of a synthesis gas

Abstract: A process for the generation of a synthesis gas is described comprising the steps of: (a) forming a raw synthesis gas comprising hydrogen and carbon oxides by (i) gasification of a carbonaceous feedstock at elevated temperature and pressure, and (ii) cooling and washing the resulting gas stream with water, (b) dividing the raw synthesis gas into first and second streams, (c) subjecting the first stream of raw synthesis gas, in the presence of steam, to the water gas shift reaction to form a shifted gas mixture, (d) cooling the second raw synthesis gas stream and shifted gas mixture to below the dew point to condense water and separating the resulting condensates therefrom to form a dry raw synthesis gas mixture, and a dry shifted gas mixture respectively, (e) feeding the dry raw synthesis gas mixture and a dry shifted gas mixture to a gas- washing unit operating by means of counter-current solvent flow, such that the solvent flowing through said unit contacts first with the dry raw gas mixture and then the dry shifted gas mixture, and (f) collecting from said gas-washing unit a synthesis gas having a stoichiometry ratio, R = (H2-CO2)/(CO+CO2), in the range 1.4 to 3.3. The synthesis gas may be used for methanol production, for the Fischer-Tropsch synthesis of liquid hydrocarbons or for the production of synthetic natural gas.