TEM Evidence for Factors Affecting the Genesis of Carbon Species on Bare and K-Promoted Ni/MgO Catalysts During the Dry Reforming of Methane Научная публикация
Журнал |
Carbon
ISSN: 0008-6223 , E-ISSN: 1873-3891 |
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Вых. Данные | Год: 2002, Том: 40, Номер: 7, Страницы: 1063-1070 Страниц : 8 DOI: 10.1016/S0008-6223(01)00243-3 | ||||||
Ключевые слова | A. Catalytically grown carbon, B. Catalyst support, Doping, C. Transmission electron microscopy | ||||||
Авторы |
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Организации |
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Реферат:
The structure and morphology of carbon species generated under dry reforming of methane (DRM) at 650 and 800°C on ‘bare’ and ‘K-doped’ Ni/MgO catalysts have been comparatively investigated by Transmission Electron Microscopy (TEM) analyses of ‘used’ samples. K-addition (Kat/Niat, 0.125) strongly improves the resistance of the Ni/MgO catalyst to coking and sintering phenomena at any temperature. At 650°C, an extensive formation of filamentous (whisker carbon) carbon species on bare Ni/MgO catalyst causes the detachment of a large number of Ni particles from the support with a consequent destruction of the structure and remarkable sintering phenomena of the active phase. Considerably lower amounts of carbon deposits with a shell-like (encapsulating carbon) morphology, forming at 800°C on both catalysts, point to the Bouduard reaction as the main route of carbon deposition on Ni-based catalysts during DRM. The electronic effect induced by potassium on the active phase of the Ni/MgO system, timely monitored by a rise in Eapp of DRM from 50 to 70 kJ/mol, markedly hinders the rate of coking also affecting the morphology of carbon whiskers, by inhibiting the processes of C diffusion and nucleation across Ni particles under steady-state conditions.
Библиографическая ссылка:
Frusteri F.
, Spadaro L.
, Arena F.
, Chuvilin A.L.
TEM Evidence for Factors Affecting the Genesis of Carbon Species on Bare and K-Promoted Ni/MgO Catalysts During the Dry Reforming of Methane
Carbon. 2002. V.40. N7. P.1063-1070. DOI: 10.1016/S0008-6223(01)00243-3 WOS Scopus РИНЦ
TEM Evidence for Factors Affecting the Genesis of Carbon Species on Bare and K-Promoted Ni/MgO Catalysts During the Dry Reforming of Methane
Carbon. 2002. V.40. N7. P.1063-1070. DOI: 10.1016/S0008-6223(01)00243-3 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 31 мая 2001 г. |
Принята к публикации: | 4 сент. 2001 г. |
Опубликована online: | 2 мая 2002 г. |
Опубликована в печати: | 1 июн. 2002 г. |
Идентификаторы БД:
Web of science | WOS:000176400500010 |
Scopus | 2-s2.0-0036603546 |
РИНЦ | 13390737 |
Chemical Abstracts | 2002:337699 |
Chemical Abstracts (print) | 137:203568 |
OpenAlex | W1975979625 |