Cинтез композитов состава Co-Mn/диатомит методом низкотемпературного горения

Энергоэффективным методом низкотемпературного горения получены Co-Mn-содержащие композиты на основе природного и активированного диатомита Утесайского месторождения (Республика Казахстан) в качестве носителя (матрицы). Активация включала этапы промывки водой, прокалки при 500 °С, а также обработки раствором HCl, в различных сочетаниях. Нанесение фазы, содержащей 5 мас. % Co + 5 мас. % Mn (в расчете на металлы), на диатомит производили путем низкотемпературного горения смеси нитратов Co и Mn (окислители) с мочевиной (восстановитель, горючее). Максимальная температура в волне горения достигала 337 °С. Исследованы физико-химические свойства композитов методами РФА, СЭМ/ЭДС, и измерена удельная поверхность по адсорбции азота. Основными фазами в составе композитов по данным РФА являлись модификации SiO₂ (кварц, тридимит и кристобалит). Согласно результатам СЭМ/ЭДС, имеет место неравномерное распределение компонентов Co-Mn-содержащей фазы по поверхности гранул катализаторов, связанное с неоднородностью морфологии поверхности и внутренних пор природного диатомита. Также были обнаружены примесные элементы (Mg, Al, Na, K, Ca, Fe). Удельная поверхность по БЭТ образцов носителей составила от 56,0 до 83,5 м²/г, а композитов – от 46,4 до 78,5 м²/г. Полученные композиты предполагается использовать как катализаторы процесса глубокого окисления СО и углеводородов для экологически важных технологий нейтрализации выхлопных и отходящих газов техногенной природы. 

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