Tseng Ting Ke, Chang Han Ching, Chu Hsin, Chen Hung Ta
Department of Environmental Engineering and Sustainable Environment Research Center, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan.
J Hazard Mater. 2008 Dec 30;160(2-3):482-8. doi: 10.1016/j.jhazmat.2008.03.058. Epub 2008 Mar 20.
The metal-ferrite (chromium-ferrite and zinc-ferrite) sorbents made from the heavy metal wastewater sludge have been developed for the hydrogen sulfide removal from coal gas. The high temperature absorption of hydrogen sulfide from coal gas with the metal-ferrite sorbent in a fixed bed reactor was conducted in this study. The metal-ferrite powders were the products of the ferrite process for the heavy metal wastewater treatment. The porosity analysis results show that the number of micropores of the sorbents after sulfidation and regeneration process decreases and the average pore size increases due to the acute endothermic and exothermic reactions during the sulfidation-regeneration process. The FeS, ZnS, and MnS peaks are observed on the sulfided sorbents, and the chromium extraction of the CFR6 can fulfill the emission standard of Taiwan EPA. The suitable sulfidation temperature range for chromium-ferrite sorbent is at 500-600 degrees C. In addition, effects of various concentrations of H2 and CO were also conducted in the present work at different temperatures. By increasing the H2 concentration, the sulfur sorption capacity of the sorbent decreases and an adverse result is observed in the case of increasing CO concentration. This can be explained via water-shift reaction.
由重金属废水污泥制成的金属铁氧体（铬铁氧体和锌铁氧体）吸附剂已被开发用于从煤气中去除硫化氢。本研究在固定床反应器中用金属铁氧体吸附剂对煤气中的硫化氢进行了高温吸附。金属铁氧体粉末是重金属废水处理铁氧体工艺的产物。孔隙率分析结果表明，由于硫化 - 再生过程中剧烈的吸热和放热反应，硫化和再生后的吸附剂微孔数量减少，平均孔径增大。在硫化后的吸附剂上观察到了FeS、ZnS和MnS峰，CFR6的铬提取量可达到台湾环保署的排放标准。铬铁氧体吸附剂合适的硫化温度范围是500 - 600摄氏度。此外，本工作还在不同温度下研究了各种浓度的H2和CO的影响。通过提高H2浓度，吸附剂的硫吸附容量降低，而提高CO浓度则会观察到相反的结果。这可以通过水煤气变换反应来解释。
