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A APPENDIX A: UTILIZATION OF CO2 Treatment of Miscellaneous Gases H2S is produced in large amounts during de-sulfurization of fossil fuels and in coal gasification and liquefaction processes. H2S gas is frequently released to the atmosphere above the waste water in sewers, where it can accumulate, oxidize to sulfuric acid, and corrode pipes. Electrochemical alternatives to the Claus process for H2S treatment have been tested with H2S removal of 99% [32]. Heating H2S to yield H2 to be fed to a SOFC is an option. Using a Na-S cell, hydrogen can be generated from H2S effluent from various process streams such as crude oil or natural gas. The hydrogen generated can be fed to a fuel cell for current generation. Electrical coupling of the fuel cell with the Na-S cell would result in high process efficiency. Some other examples of treatment of effluents are given below: • Reduction of NO and SO2 to N2O, N2 etc. Thermodynamically favorable reduction of NO to produce NH3, HA, and N2O – electro-generative process can be used to react NO in cell, with H2 feed, thus behaving like a fuel cell. • N2O – H2 fuel cell using Pd-Pt (1:1) catalyst provides OCV of 1V, and is a viable option for generating power. • Mixed ioninc and electronic conductors (MIEC) such as perovskites transfer ions and electrons simultaneously perovskite type mixed oxides suitable for this. This can be used to decompose NOx. Similar schemes have been proposed for H2S decomposition. • Electrochemical decomposition of CFCs by metal-supported gas diffusion electrodes. • NOx catalyzed partial oxidation of CH4 to yield syngas, HCHO, CH3OH. • Partial reduction of SOx by CH4 and waste biomass inside coal-fired boiler. • Catalytic conversion and combustion of methane. 92PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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