[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-42822-en":3,"doc-seo-42822-105":30,"detail-sidebar-cat-0-en-105":91},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":21,"is_downloadable":21,"audit_status":21,"page_count":22,"language":23,"language_code":24,"site_id":25,"html_lang":24,"table_of_contents":26,"faqs":27,"seo_title":13,"seo_description":14,"update_tm":28,"read_time":29},42822,1099513958607,"Jiven","https://ap-avatar.wpscdn.com/avatar/100002390cf8733938c?x-image-process=image/resize,m_fixed,w_180,h_180&k=1778829742770036399",8,"Research & Report","Gas-Phase Photochemical Overall H2 S Splitting by UV Light Irradiation","Gas-phase photochemical splitting of hydrogen sulfide enables production of stoichiometric H2 and S under UV irradiation. The study examines H2S dissociation at 254 nm near room temperature, explicitly considering the impact of typical natural-gas/biogas components such as CH4 and CO2 and the absence of catalysts or photocatalysts. Results show near-50% quantum efficiency and propose a mechanism for H2 and S formation, aiming for direct treatment of gas streams containing unwanted H2S.","DOI: 10.1002/cssc.201700294 Full Papers  \nGas-Phase Photochemical Overall H2 S Splitting by UV Light Irradiation  \nHerme G. Baldovi,[a] Josep Albero,[b] Belen Ferrer,[a] Diego Mateo,[b] Mercedes Alvaro,[a] and Hermenegildo Garc&a*[b]  \n\n| Splitting of hydrogen sulfide is achieved to produce valueadded chemicals. Upon irradiation at 254 nm in the gas phase | presence of CH4 and CO2 (typical components in natural gas and biogas in which H2S is an unwanted component) on the |\n| --- | --- |\n| and in the absence of catalysts or photocatalysts at near room | efficiency of overall H2S splitting was observed. A mechanism |\n| temperature, H2S splits into stoichiometric amounts of H2 and | for the H2 and S formation is proposed. |\n| S with a quantum efficiency close to 50% . No influence of the |  |\n\nIntroduction  \nHydrogen sulfide is a toxic and malodorous gas formed during the anaerobic fermentation and decomposition of organic matter that is present in biogas, most natural gas wells, and in volcanic eruptions. Besides such natural origin, the presence of S compounds in fossil oils and the environmental problems associated to their combustion makes it necessary to use harsh hydrodesulfuration treatments of fuels, which is also a massive source of H2S at refineries. [1]  \nDifferent methods are employed for H2S trapping and removal from natural and biogas, however, those based on its solubilization in aqueous basic media are the most widely used. [2] This creates the problem of treating large volumes of the wastewaters generated in H2S separation. It would be desirable to develop methodologies to transform H2S directly in the gas phase without interference of the presence of a large excess of CH4, CO2, moisture, or other gases. In this way, it should be possible the selectively decompose H2S in those streams in which this gas is usually present without the need of isolation. The most widely industrial application of H2S is asa source of elemental sulfur that is used in a large percentage for the synthesis of sulfuric acid.  \nThe classical industrial process for large-scale conversion of H2S is the over hundred-years old Claus process [Eq. (1)] . In this process, H2S is converted in two steps into elemental Sand H2O. The first step of the Claus process consists in the controlled thermal oxidation of H2S to SO2 and H2O at tempera-  \n[a] Dr. H. G. Baldovi, Dr. B. Ferrer, Prof. M. Alvaro Departmento de Qu&mica  \nUniversitat PolitHcnica de ValHncia  \nCamino de Vera s/n, 46022, Valencia (Spain)  \n[b] Dr. J. Albero, D. Mateo, Prof. H. Garc&a  \nInstituto Universitario de Tecnolog&a Qu&mica, CSIC-UPV  \nUniversitat PolitHcnica de ValHncia  \n[Avda. de](Avda. de) los Naranjos s/n, 46022, Valencia (Spain)  \n[E-mail: hgarcia@qim.upv.es](E-mail: hgarcia@qim.upv.es)  \n Supporting Information and the ORCID identification number(s) for the  \n author(s) of this article can be found under [https://doi.org/10.1002/](https://doi.org/10.1002/)[ ](https://doi.org/10.1002/)[cssc.201700294](cssc.201700294) .  \ntures above 850 8C [Eq. (2)] . A subsequent catalytic step with activated aluminum(III) or titanium(IV) oxides yields elemental S and H2O [Eq. (3)] .  \n8H2 S þ 6O2 D! 2SO2 þ 3S2 þ 8H2 O ð1Þ  \n2H2 S þ 3O2 D! 2 SO2 þ 2H2 O ð2Þ  \n2H2 S þ SO2 cKat!: 3S þ 2H2 O cat : Al2 O3 or TiO2 ð3Þ  \nAlthough the Claus process is a well-proven technology, it has several drawbacks including the need to purify and capture H2S from the effluents, the capital investment required for the two-step processes, the high temperatures required in the thermal step [Eq. (2)], and the severe catalyst deactivation during the second step [Eq. (3)], among others.  \nA conceptual limitation of the Claus reaction is the waste of part of the chemical energy stored in the H2S bonds that is used to provide the heat needed in the process, leading to the formation of H2O. [3] An alternative to the Claus process should consider the possibility of converting H2S directly in the gas phase without inte","cbCaifQ9HPx0D1rj","https://ap.wps.com/l/cbCaifQ9HPx0D1rj","pdf",697093,2,1,5,"English","en",105,"# Introduction\n## Industrial background and limitations of Claus process\n## Need for direct gas-phase conversion of H2S\n## Previous approaches and gaps\n## Study focus and objectives","[{\"question\":\"What reaction does the paper focus on for hydrogen sulfide treatment?\",\"answer\":\"It focuses on direct, overall gas-phase photochemical splitting of H2S into stoichiometric H2 and elemental S under UV light irradiation.\"},{\"question\":\"Under what conditions is the H2S splitting investigated?\",\"answer\":\"The work investigates irradiation at 254 nm in the gas phase near room temperature, specifically evaluating the role of CH4 and CO2 presence and the absence of catalysts or photocatalysts.\"},{\"question\":\"Why is the traditional Claus process considered to have limitations?\",\"answer\":\"The Claus process requires purification and capture steps, involves two-step capital-intensive operation, uses high temperatures, and suffers from severe catalyst deactivation in the catalytic 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reaction does the paper focus on for hydrogen sulfide treatment?","Question",{"text":75,"@type":76},"It focuses on direct, overall gas-phase photochemical splitting of H2S into stoichiometric H2 and elemental S under UV light irradiation.","Answer",{"name":78,"@type":73,"acceptedAnswer":79},"Under what conditions is the H2S splitting investigated?",{"text":80,"@type":76},"The work investigates irradiation at 254 nm in the gas phase near room temperature, specifically evaluating the role of CH4 and CO2 presence and the absence of catalysts or photocatalysts.",{"name":82,"@type":73,"acceptedAnswer":83},"Why is the traditional Claus process considered to have limitations?",{"text":84,"@type":76},"The Claus process requires purification and capture steps, involves two-step capital-intensive operation, uses high temperatures, and suffers from severe catalyst deactivation in the catalytic 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