Материалы на основе La и Co для разложения аммиака: активность, стабильность и структурные изменения

Были синтезированы фазы La_0.9Sr_0.1Sc_0.9Co_0.1O_3-δ (LS) и La_0.9Sr_0.1CoO_3-δ (LC) и композитные материалы на их основе. В литературе есть данные об активности чистых или модифицированных форм LC при разложении аммиака, но нет данных об активности фазы LS и композитов LS-LC. Поэтому были исследованы стабильность и активность композитов LS-LC и исходных LS и LC в разложении аммиака. Наилучший результат разложения аммиака при температуре 700 °C и WHSV 60 000 мл NH₃·г_кат^-1·ч^-1 показывает LC — 99%, наихудший — LS — 80%. При тех же условиях активность образцов LC, 40LS-60LC и 50LS-50LC остаётся неизменной в течение 40 часов. Было обнаружено, что при разложении аммиака фаза LC распадается с образованием наночастиц кобальта и La(OH)₃, но фаза LS не претерпевает значительных изменений, что подтверждается результатами рентгеновской дифракции, ИК-спектроскопии, рамановской спектроскопии и ПЭМ.

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