Образование металл-оксидных нанокомпозитов при частичном восстановлении никелатов неодима-стронция

Термическое восстановление твердых растворов Nd_2-xSrxNiO₄- (x = 0 - 1.4) в аргоноводородной смеси протекает в несколько раздельных стадий. Начальные стадии восстановления, по-видимому, связанные с восстановлением Ni³⁺ до Ni² , сопровождаются минимальными изменениями первоначальной структуры типа K₂NiF₄ при отсутствии изменений морфологии оксидных частиц. Необычным является одновременное появление наночастиц металлического никеля на поверхности оксидных продуктов восстановления. Образующиеся таким образом никель-оксидные нанокомпозиты, сходные с продуктами высокотемпературного частичного восстановления некоторых сложных оксидов (redox exsolution), проявляют значимую каталитическую активность в процессах восстановления CO₂ при T = 350-400C.

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