High-Surface-Area Synthesis of Iron-Doped CaTiO at Low Temperatures: New Insights into Oxygen Activation, Iron States, and the Impact on Methane Oxidation.

Inorg Chem

Laboratoire des Synthèse et Fonctionnalisation des Céramiques, CNRS/Saint-Gobain CREE, Saint-Gobain Research Provence, UMR 3080, 550 Avenue Alphonse Jauffret, Cavaillon 84300, France.

Published: October 2022

AI Article Synopsis

  • The study focuses on synthesizing CaTiFeO materials using a modified Pechini method with citric acid and various polyols to optimize their surface area and phase purity.
  • Researchers investigate the effects of different polyols and iron content on properties like oxygen exchange rate, reducibility, and catalytic performance for methane oxidation.
  • Findings reveal that while oxygen activation and diffusion improve with titanium substitution, methane oxidation performance plateaus when the titanium concentration exceeds 0.3, indicating a specific role for iron sites in the catalytic process.

Article Abstract

In the present work, a series of CaTiFeO (0 < < 0.5) materials are prepared using a modified Pechini method based on citric acid and a polyol as chelating agents. The synthesis conditions are optimized with respect to the specific surface area and phase purity by varying polyols (ethylene glycol, glycerol, and 1.6-hexanediol) and the ratio between citric acid, polyols, and cations. The impact of the polyols and the iron content (up to 40 mol % on the B site) is studied with respect to the oxygen exchange rate, reducibility using H-TPR, and catalytic performance for methane total oxidation. A correlation between the oxygen exchange rate studied using O exchange in powdered samples of CaTiFeO (0 < < 0.5) and ferric sites determined using Mössbauer spectroscopy and H-TPR is established. The oxygen activation and diffusion in CaTiFeO (0 < < 0.5) continuously increase in the studied range of Ti substitution. The methane oxidation performance does not increase above = 0.3, showing that methane oxidation is not limited by surface oxygen activation and CH is activated by specific iron sites in Fe-doped perovskites.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.inorgchem.2c01966DOI Listing

Publication Analysis

Top Keywords

oxygen activation
12
methane oxidation
12
citric acid
8
oxygen exchange
8
exchange rate
8
oxygen
5
high-surface-area synthesis
4
synthesis iron-doped
4
iron-doped catio
4
catio low
4

Similar Publications

Background: Interactions between RNA-binding proteins and RNA regulate RNA transcription during osteoporosis. Ferroptosis, a programmed cell death caused by iron metabolism, plays a vital role in osteoporosis. However, the mechanisms by which RNA-binding proteins are involved in ferroptosis during osteoporosis remain unclear.

View Article and Find Full Text PDF

Chronic/heavy exposure with ethanol is associated with risk of type 2 diabetes, due to β-cells dysfunction. It has been reported that ethanol can induce oxidative stress directly or indirectly by involvement of mitochondria. We aimed to explore the protective effects of the crocin/gallic acid/L-alliin as natural antioxidants separately on ethanol-induced mitochondrial damage.

View Article and Find Full Text PDF

Physical activity (PA) reduces the risk of negative mental and physical health outcomes in older adults. Traditionally, PA intensity is classified using METs, with 1 MET equal to 3.5 mL O·min·kg.

View Article and Find Full Text PDF

Effect of catalase on CPC production during fermentation of Acremonium chrysogenum.

Bioresour Bioprocess

January 2025

Qingdao Innovation Institute of East China University of Science and Technology, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China.

Cephalosporin C (CPC) is a critical raw material for cephalosporin antibiotics produced by Acremonium chrysogenum. During fermentation, the oxygen supply is a crucial factor limiting the efficient biosynthesis of CPC. This study demonstrated that the addition of exogenous surfactants significantly increased the dissolved oxygen (DO) level, extracellular catalase content, and final CPC titer.

View Article and Find Full Text PDF

Hypoxia is a common feature of solid tumors that has previously been linked to resistance to radiotherapy and chemotherapy, and more recently to immunotherapy. In particular, hypoxic tumors exclude T cells and inhibit their activity, suggesting that tumor cells acquire a mechanism to evade T-cell recognition and killing. Our analysis of hypoxic tumors indicates that hypoxia downregulates the expression of MHC class I and its bound peptides (i.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!