Surface Property-Activity Relations of Co/Sn Oxide Nanocatalysts Evaluated Using a Model Reaction: Surface Characterization Study

Ndzondelelo Bingwa; Matumuene Joe Ndolomingo; Tafadzwa Mabate; Sifelani Dube; Reinout Meijboom

doi:10.1007/s10562-019-02819-2

Surface Property-Activity Relations of Co/Sn Oxide Nanocatalysts Evaluated Using a Model Reaction: Surface Characterization Study

Ndzondelelo Bingwa, Matumuene Joe Ndolomingo, Tafadzwa Mabate, Sifelani Dube, Reinout Meijboom

Chemical Sciences

University of Johannesburg

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Abstract: Herein we report on the synthesis, characterization and catalytic evaluation of cobalt (Co) and tin (Sn) oxide catalysts synthesized via the sol–gel approach. Preliminary characterization using nitrogen sorption measurements show the materials as mesoporous with relatively high surface area. The catalyst with the least amount of Co had the highest surface area (146 m²/g) compared to the catalysts with the highest amount of Co. Furthermore, temperature-programmed reduction (H₂-TPR) was used to study the redox properties of the catalysts. The H₂-TPR analysis revealed that the catalysts are only reduced at relatively high temperatures (> 300 °C). While the temperature-programmed desorption using ammonia (NH₃-TPD) and carbon dioxide (CO₂-TPD) results suggest that the total amount of acidic and basic sites is the function of different amounts of metal content in the catalytic materials. The catalyst with the least amount of Co appeared to have the highest number of acidic sites compared to other catalysts. Evaluation of the catalytic activity was studied using oxidation of morin as model reaction. The catalyst with the least amount of Co, (Co_0.3Sn_0.7O_x) appeared to be the most active catalyst. Graphical Abstract: [Figure not available: see fulltext.].

Original language	English
Pages (from-to)	2940-2949
Number of pages	10
Journal	Catalysis Letters
Volume	149
Issue number	10
DOIs	https://doi.org/10.1007/s10562-019-02819-2
Publication status	Published - 1 Oct 2019

Keywords

Cobalt-tin oxide
Morin oxidation
Temperature-programmed desorption

ASJC Scopus subject areas

Catalysis
General Chemistry

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10.1007/s10562-019-02819-2

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title = "Surface Property-Activity Relations of Co/Sn Oxide Nanocatalysts Evaluated Using a Model Reaction: Surface Characterization Study",

abstract = "Abstract: Herein we report on the synthesis, characterization and catalytic evaluation of cobalt (Co) and tin (Sn) oxide catalysts synthesized via the sol–gel approach. Preliminary characterization using nitrogen sorption measurements show the materials as mesoporous with relatively high surface area. The catalyst with the least amount of Co had the highest surface area (146 m2/g) compared to the catalysts with the highest amount of Co. Furthermore, temperature-programmed reduction (H2-TPR) was used to study the redox properties of the catalysts. The H2-TPR analysis revealed that the catalysts are only reduced at relatively high temperatures (> 300 °C). While the temperature-programmed desorption using ammonia (NH3-TPD) and carbon dioxide (CO2-TPD) results suggest that the total amount of acidic and basic sites is the function of different amounts of metal content in the catalytic materials. The catalyst with the least amount of Co appeared to have the highest number of acidic sites compared to other catalysts. Evaluation of the catalytic activity was studied using oxidation of morin as model reaction. The catalyst with the least amount of Co, (Co0.3Sn0.7Ox) appeared to be the most active catalyst. Graphical Abstract: [Figure not available: see fulltext.].",

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author = "Ndzondelelo Bingwa and Ndolomingo, {Matumuene Joe} and Tafadzwa Mabate and Sifelani Dube and Reinout Meijboom",

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T1 - Surface Property-Activity Relations of Co/Sn Oxide Nanocatalysts Evaluated Using a Model Reaction

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AU - Bingwa, Ndzondelelo

AU - Ndolomingo, Matumuene Joe

AU - Mabate, Tafadzwa

AU - Dube, Sifelani

AU - Meijboom, Reinout

PY - 2019/10/1

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N2 - Abstract: Herein we report on the synthesis, characterization and catalytic evaluation of cobalt (Co) and tin (Sn) oxide catalysts synthesized via the sol–gel approach. Preliminary characterization using nitrogen sorption measurements show the materials as mesoporous with relatively high surface area. The catalyst with the least amount of Co had the highest surface area (146 m2/g) compared to the catalysts with the highest amount of Co. Furthermore, temperature-programmed reduction (H2-TPR) was used to study the redox properties of the catalysts. The H2-TPR analysis revealed that the catalysts are only reduced at relatively high temperatures (> 300 °C). While the temperature-programmed desorption using ammonia (NH3-TPD) and carbon dioxide (CO2-TPD) results suggest that the total amount of acidic and basic sites is the function of different amounts of metal content in the catalytic materials. The catalyst with the least amount of Co appeared to have the highest number of acidic sites compared to other catalysts. Evaluation of the catalytic activity was studied using oxidation of morin as model reaction. The catalyst with the least amount of Co, (Co0.3Sn0.7Ox) appeared to be the most active catalyst. Graphical Abstract: [Figure not available: see fulltext.].

AB - Abstract: Herein we report on the synthesis, characterization and catalytic evaluation of cobalt (Co) and tin (Sn) oxide catalysts synthesized via the sol–gel approach. Preliminary characterization using nitrogen sorption measurements show the materials as mesoporous with relatively high surface area. The catalyst with the least amount of Co had the highest surface area (146 m2/g) compared to the catalysts with the highest amount of Co. Furthermore, temperature-programmed reduction (H2-TPR) was used to study the redox properties of the catalysts. The H2-TPR analysis revealed that the catalysts are only reduced at relatively high temperatures (> 300 °C). While the temperature-programmed desorption using ammonia (NH3-TPD) and carbon dioxide (CO2-TPD) results suggest that the total amount of acidic and basic sites is the function of different amounts of metal content in the catalytic materials. The catalyst with the least amount of Co appeared to have the highest number of acidic sites compared to other catalysts. Evaluation of the catalytic activity was studied using oxidation of morin as model reaction. The catalyst with the least amount of Co, (Co0.3Sn0.7Ox) appeared to be the most active catalyst. Graphical Abstract: [Figure not available: see fulltext.].

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Surface Property-Activity Relations of Co/Sn Oxide Nanocatalysts Evaluated Using a Model Reaction: Surface Characterization Study

Abstract

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