Petroleum ChemistryPetroleum ChemistryНефтехимия0028-24213034-5626The Russian Academy of Sciences65561810.31857/S0028242123030115JCJIPKArticlesСтатьиResearch ArticleNovel Samarium Cobaltate/Silicon Carbide Composite Catalyst for Dry Reforming of Methane into Synthesis GasКобальтат самария/карбид кремния - новый каталитический композитный материал для получения синтез-газа углекислотной конверсией метанаLoktevA. S.ЛоктевА. С.genchem@gubkin.ruArkhipovaV. A.АрхиповаВ. А.petrochem@ips.ac.ruBykovM. A.БыковМ. А.petrochem@ips.ac.ruSadovnikovA. A.СадовниковА. А.petrochem@ips.ac.ruDedovA. G.ДедовА. Г.petrochem@ips.ac.ruGubkin Russian State University of Oil and Gas (National Research University)Российский государственный университет нефти и газа (Национальный исследовательский университет) имени И.М. ГубкинаTopchiev Institute of Petrochemical Synthesis, Russian Academy of SciencesИнститут нефтехимического синтеза им. А.В. Топчиева РАНFaculty of Chemistry, Lomonosov Moscow State UniversityМосковский государственный университет имени М.В. Ломоносова15062023633NO3 (2023)№3 (2023)41642811022025Copyright ©; 2023, Russian Academy of SciencesCopyright ©; 2023, Российская академия наук2023Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0028-2421/article/view/655618

The paper describes a specifically developed novel samarium cobaltate/silicon carbide composite that transforms into a high-performance carbon-resistant catalyst for dry reforming of methane into syngas (DRM). This 30%SmCoO3/70%SiC composite without hydrogen prereduction was tested in DRM at atmospheric pressure and GHSV 15 L g–1 h–1 (of an equimolar CH4–CO2 mixture). During the test, the yields of hydrogen and carbon monoxide reached 92 and 91 mol %, respectively, at 900°C, and 20 and 28 mol % at 700°C. Using XRD, TGA, and SEM examination, zero carbonization of the catalyst surface was demonstrated. It was found that, in the course of DRM, the initial composite transformed into a material that contained silicon carbide, samarium silicate, and samarium oxide, as well as metallic cobalt nanoparticles (<20 nm).

Разработан новый композитный материал - кобальтат самария/карбид кремния, образующий эффективный, устойчивый к зауглероживанию катализатор углекислотной конверсии метана в синтез-газ. Показано, что композитный материал, содержащий 30 мас. % кобальтата самария и 70 мас. % карбида кремния, без предварительного восстановления водородом, при атмосферном давлении и скорости подачи эквимолярной смеси метана и диоксида углерода 15 (л/г кат.)·ч-1 позволяет достигать выходов водорода и монооксида углерода 92 и 91 мольн. % при 900°С и соответственно 20 и 28 мольн. % при 700°С. Методами рентгеновской дифрактометрии, термогравиметрического анализа и растровой электронной микроскопии показано отсутствие зауглероживания поверхности катализатора. Установлено, что после использования в углекислотной конверсии метана исходный композит преобразуется в материал, содержащий карбид кремния, силикат и оксид самария, а также металлический кобальт с размерами частиц менее 20 нм.

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