Structure and reactive properties of Nb-impregnated two-dimensional pillared MWW zeolites for total oxidation of volatile organic compounds
- Universidade Federal do Rio Grande do Sul (Brazil)
- Universidade Federal do Paraná - UFPR (Brazil)
- Argonne National Laboratory (ANL), Argonne, IL (United States); Canadian Light Source Inc., Saskatchewan (Canada)
- Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia (Spain)
- Universidade Federal do Rio Grande do Norte - UFRN, Natal (Brazil)
In this work, the structure and reactive properties of niobium (Nb)-impregnated MWW-type materials were evaluated for gas-phase total oxidation of volatile organic compounds, including BTX (benzene, toluene and o -xylene). The role of the type of structure (two or three-dimensional) and the loading of Nb were considered. The results indicated most Nb species with a tetrahedral coordination on the external surfaces of both two- and three-dimensional zeolites, together with a minimal contribution of octahedral extra-framework Nb2O5 species. The texture and Nb content played a key role in the gas-phase total oxidation of BTX. With the same Nb content (5 wt%), the pillared zeolite exhibited a higher specific surface, larger pore volume and mesopores between the MWW nanosheets when compared to the MCM-22 zeolites, which resulted in high accessibility of the reactant molecules to the active sites, reflected in higher BTX conversion at lower and higher temperatures (50–300 °C). The best performance was achieved with the pillared zeolite (10 wt% Nb), reaching a BTX conversion at 300 °C of 92%, 69% and 58%, respectively. Here, the catalyst was stable for up to 30 h of reaction.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1981711
- Alternate ID(s):
- OSTI ID: 1862522
- Journal Information:
- Microporous and Mesoporous Materials, Vol. 327, Issue C; ISSN 1387-1811
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
B–MWW Zeolite: The Case Against Single–Site Catalysis
B‐MWW Zeolite: The Case Against Single‐Site Catalysis