Nanostructured manganese oxides as highly active catalysts for enhanced hydrolysis of bis(4-nitrophenyl)phosphate and catalytic decomposition of methanol

0541518 - ÚACH 2022 RIV GB eng J - Journal Article
Šťastný, Martin - Issa, G. - Popelková, Daniela - Ederer, J. - Kormunda, M. - Kříženecká, S. - Henych, Jiří
Nanostructured manganese oxides as highly active catalysts for enhanced hydrolysis of bis(4-nitrophenyl)phosphate and catalytic decomposition of methanol.
Catalysis Science &Technology. Roč. 11, č. 5 (2021), s. 1766-1779. ISSN 2044-4753. E-ISSN 2044-4761
R&D Projects: GA MŠMT(CZ) LM2018124
Grant - others:AV ČR(CZ) BAS-20-11
Program: Bilaterální spolupráce
Institutional support: RVO:61388980
Keywords : Ammonia * Carbon monoxide * Redox reactions * X ray photoelectron spectroscopy
OECD category: Inorganic and nuclear chemistry
Impact factor: 6.177, year: 2021
Method of publishing: Limited access
https://doi.org/10.1039/D0CY02112A

Manganese oxide-based (MnO ) catalysts have received increasing attention due to their low cost, low toxicity, and the ability to degrade organic molecules under mild conditions. In this work, several nanostructured MnObased catalysts were preparedviaredox reactions of manganese compounds in an aqueous solution and alkaline precipitation with aqueous ammonia. A wide arsenal of analytical techniques, including nitrogen physisorption (BJH and BET), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), and Raman spectroscopy were applied for their characterization. The nanostructured MnO exhibited high catalytic activity in hydrolysis of phosphate diester-based substrate bis(4-nitrophenyl)phosphate (BNPP) at 328 K. Furthermore, MnO specimens were also studied in decomposition of methanol to carbon monoxide and hydrogen as a potential alternative fuel. The results show high dependency of the materials catalytic properties on the synthesis method. It was found that the varying fractions of redox-active Mn /Mn /Mn surface sites and the high proportion of oxygen species (such as O or O ) together with the particle dispersion and morphology are important for high catalytic activity of MnO in both investigated catalytic reactions. Based on the experimental data, possible mechanisms of BNPP hydrolysis and methanol decomposition were proposed and discussed in detail.
Permanent Link: http://hdl.handle.net/11104/0319079