On the catalytic role of superficial VOx species and coke deposited on mesoporous MgO replica in oxidative dehydrogenation of ethylbenzene
Authors:
- Sebastian Jarczewski,
- Marek Drozdek,
- Piotr Michorczyk,
- Carlos Cuadrado-Collados,
- Jesus Gandara-Loe,
- Joaquín Silvestre-Albero,
- Lidia Lityńska-Dobrzyńska,
- Piotr Kuśtrowski
Abstract
Mesoporous MgO was synthesized by the nanoreplication method using CMK-3 carbon as a hard template and magnesium nitrate as a metal oxide precursor. The produced support was modified with different amounts of ammonium metavanadate solution. Various distributions of V-containing species on the MgO surface were found by XRD, low-temperature adsorption of N2, TEM, XPS and UV-vis-DR spectroscopy. At low V loadings isolated VO4 dominated. Increasing V content resulted in clustering of VO4 species and the formation of Mg3V2O8 crystallites. As found in temperature-programmed reduction (H2-TPR), the latter phase was clearly harder in reduction by H2 compared to highly dispersed VO4 forms. The developed materials appeared to be very active catalysts of oxidative dehydrogenation of ethylbenzene (ODH). The optimal catalytic performance was observed for the sample containing 10 wt.% of vanadium. The initial ethylbenzene conversion of 63.6 % at selectivity to styrene of 86.9 % was achieved at temperature as low as 500 °C. A notable influence of carbonaceous deposit formed during the ODH reaction on the catalytic activity was discussed, including presentation of both coexisting superficial reaction mechanisms. A reasonable regeneration procedure to recover lost activity was developed.
- Record ID
- CUTfe8158c211c14c3c9f6b72336046bb34
- Publication categories
- ;
- Author
- Journal series
- Applied Surface Science, ISSN 0169-4332, e-ISSN 1873-5584
- Issue year
- 2020
- Vol
- 504
- Pages
- [1-11]
- Article number
- 144336
- Other elements of collation
- fot.; rys.; tab.; wykr.; Bibliografia (na s.) - 10-11; Bibliografia (liczba pozycji) - 47; Oznaczenie streszczenia - Abstr.; Data udostępnienia on-line - 2020-10-23; Numeracja w czasopiśmie - Vol. 504
- Keywords in English
- nanoreplication, coke deposition, magnesium vanadate, regeneration, oxidative dehydrogenation, styrene production
- DOI
- DOI:10.1016/j.apsusc.2019.144336 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S0169433219331526 Opening in a new tab
- Related project
- Nanoreplikacja strukturalna: nowa, prosta i uniwersalna metoda syntezy uporządkowanych materiałów nanoporowatych do celów katalitycznych i nie tylko. . Project leader at PK: , ,
Projects financed by NSC [Projekty finansowane przez NCN] - Language
- eng (en) English
- Score (nominal)
- 140
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTfe8158c211c14c3c9f6b72336046bb34/
- URN
urn:pkr-prod:CUTfe8158c211c14c3c9f6b72336046bb34
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.