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Title: Structure and reactive properties of Nb-impregnated two-dimensional pillared MWW zeolites for total oxidation of volatile organic compounds

Abstract

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.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [4];  [5]; ORCiD logo [1]
  1. Universidade Federal do Rio Grande do Sul (Brazil)
  2. Universidade Federal do Paraná - UFPR (Brazil)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States); Canadian Light Source Inc., Saskatchewan (Canada)
  4. Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia (Spain)
  5. Universidade Federal do Rio Grande do Norte - UFRN, Natal (Brazil)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1981711
Alternate Identifier(s):
OSTI ID: 1862522
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Microporous and Mesoporous Materials
Additional Journal Information:
Journal Volume: 327; Journal Issue: C; Journal ID: ISSN 1387-1811
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Chemistry; Science & Technology - Other Topics; Materials Science; MCM-36; Pillared zeolites; Niobium; Total oxidation; Volatile organic compounds

Citation Formats

Schwanke, Anderson Joel, Balzer, Rosana, Lopes, Christian Wittee, Meira, Débora Motta, Díaz, Urbano, Pergher, Sibele, and Bernardo-Gusmão, Katia. Structure and reactive properties of Nb-impregnated two-dimensional pillared MWW zeolites for total oxidation of volatile organic compounds. United States: N. p., 2021. Web. doi:10.1016/j.micromeso.2021.111425.
Schwanke, Anderson Joel, Balzer, Rosana, Lopes, Christian Wittee, Meira, Débora Motta, Díaz, Urbano, Pergher, Sibele, & Bernardo-Gusmão, Katia. Structure and reactive properties of Nb-impregnated two-dimensional pillared MWW zeolites for total oxidation of volatile organic compounds. United States. https://doi.org/10.1016/j.micromeso.2021.111425
Schwanke, Anderson Joel, Balzer, Rosana, Lopes, Christian Wittee, Meira, Débora Motta, Díaz, Urbano, Pergher, Sibele, and Bernardo-Gusmão, Katia. Thu . "Structure and reactive properties of Nb-impregnated two-dimensional pillared MWW zeolites for total oxidation of volatile organic compounds". United States. https://doi.org/10.1016/j.micromeso.2021.111425. https://www.osti.gov/servlets/purl/1981711.
@article{osti_1981711,
title = {Structure and reactive properties of Nb-impregnated two-dimensional pillared MWW zeolites for total oxidation of volatile organic compounds},
author = {Schwanke, Anderson Joel and Balzer, Rosana and Lopes, Christian Wittee and Meira, Débora Motta and Díaz, Urbano and Pergher, Sibele and Bernardo-Gusmão, Katia},
abstractNote = {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.},
doi = {10.1016/j.micromeso.2021.111425},
journal = {Microporous and Mesoporous Materials},
number = C,
volume = 327,
place = {United States},
year = {Thu Sep 09 00:00:00 EDT 2021},
month = {Thu Sep 09 00:00:00 EDT 2021}
}

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