AI Article Synopsis
- A new cathode catalyst made of MnO2 nanorods on mesoporous ZSM-5 zeolite has been created using hydrothermal and electrostatic methods to efficiently catalyze the oxygen reduction reaction (ORR) without precious metals.
- The catalyst works well due to active Mn(4+)/Mn(3+) redox couples and Brønsted acid sites, achieving a process efficiency comparable to commercial platinum catalysts.
- It shows impressive stability with 90% current retention after 5000 cycles and excellent methanol tolerance, thanks to the synergistic effects between the MnO2 and ZSM-5 components.
Article Abstract
A precious-metal-free cathode catalyst, MnO2 nanorod-decorated mesoporous ZSM-5 zeolite nanocomposite (MnO2 / m-ZSM-5), has been successfully synthesized by a hydrothermal and electrostatic interaction approach for efficient electrochemical catalysis of the oxygen reduction reaction (ORR). The active MnOOH species, that is, Mn(4+) /Mn(3+) redox couple and Brønsted acid sites on the mesoporous ZSM-5 matrix facilitate an approximately 4 e(-) process for the catalysis of the ORR comparable to commercial 20 wt % Pt/C. Stable electrocatalytic activity with 90 % current retention after 5000 cycles, and more importantly, excellent methanol tolerance is observed. Synergetic catalytic effects between the MnO2 nanorods and the mesoporous ZSM-5 matrix are proposed to account for the high electrochemical catalytic performance.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/cssc.201600012 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
ZSM-5 Zeolite Synthesis from Coal Fly Ash Synthesised Silica: Sole Silica & Alumina Source.
ChemistryOpen
January 2025
Department of Chemistry, University of Botswana, Botswana Private bag UB, Gaborone, 00704, Botswana.
This study explores the synthesis of ZSM-5 zeolite using high-purity mesoporous silica exclusively derived from coal fly ash (CFA), eliminating the need for additional silica or alumina sources. Traditional ZSM-5 synthesis relies on costly and environmentally harmful pure chemicals, whereas this approach utilizes CFA, an industrial byproduct, addressing both cost and sustainability concerns. The synthesized ZSM-5 zeolite demonstrates exceptional purity, with a surface area of 455.
View Article and Find Full Text PDFSynthesis of Hollow Zn/ZSM-5 Nanosheets via Different Alkali Treatments with ZIF-8 as a Zn Source for Efficient Aromatization of Methanol.
Langmuir
December 2024
State Key Laboratory of Chemical Resources Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Diffusion limitations and monofunctional acidity of ZSM-5 molecular sieves affect the catalyst stability and aromatic yield in the reaction of methanol to aromatics (MTA). In this study, based on ZSM-5 nanosheets as parent molecular sieves, Zn-modified hollow ZSM-5 nanosheets were obtained after hydrothermal treatment by adding ZIF-8 or zinc nitrate as a source of Zn while treating with different types and concentrations of alkali solutions. The physical and chemical properties of the fabricated samples and their catalytic performance of methanol aromatization were systematically investigated by a combination of XRD, TEM, N adsorption-desorption, NH-TPD, Py-IR, Al MAS NMR, Si MAS NMR, XPS, and TG characterization analyses and MTA experimental evaluation.
View Article and Find Full Text PDFNovel Hierarchical Disordered Li- and Al-KIL-2 Catalysts for the Pyrolysis of Biomass Model Compounds and Wool Waste: A Comparison with ZSM-5.
Molecules
December 2024
Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH12 7NT, UK.
In this study, we investigated the pyrolysis of cellulose, lignin, phenylalanine and textile wool waste using microscale thermogravimetric analysis (TGA) and a gram-scale fixed bed reactor. The pyrolysis was conducted at 500 °C and 1 bar N, using Al- and Li-doped mesoporous KIL-2 and ZSM-5 catalysts for comparison. Our results show that amorphous Al-KIL-2 catalyst was the most efficient in producing aromatics from cellulose and lignin.
View Article and Find Full Text PDFSynthesis, Characterization, and CO Methanation Over Hierarchical ZSM-5-NiCoAl Layered Double Hydroxide Nanocomposites: Improvement of C-C Coupling to Ethane.
Chemphyschem
December 2024
Department of Chemical and Biomolecular Engineering, School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, 555 Moo 1 Pa Yup Nai, Wang Chan, Rayong, 21210, Thailand.
To date, preparing materials with highly dispersed metal nanoparticles without metal agglomeration on a solid support is challenging. This work presents an alternative approach for synthesizing NiCo species on hierarchical ZSM-5 materials derived from a ZSM-5@NiCoAl-LDHs composite. The designed material was prepared by the growth of a NiCo-layered double hydroxides (LDHs) precursor on the surface of hierarchical ZSM-5 nanosheets.
View Article and Find Full Text PDFHydrogen-free upcycling of polyethylene waste to methylated aromatics over Ni/ZSM-5 under mild conditions.
J Hazard Mater
January 2025
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China. Electronic address:
Article Synopsis
- Upcycling waste plastic into methylated aromatics using a Ni/ZSM-5 bifunctional catalyst offers a solution to plastic pollution and energy issues without the need for high temperatures, hydrogen gas, or solvents.
- The study achieved a liquid yield of 70.3% and an aromatics yield of 51.7%, with over 78.4% of the products being useful methylated aromatics like toluene and xylene.
- The catalyst effectively converts various commercial polyethylene plastics, such as gloves and bottles, demonstrating a selectivity of up to 61.1% and supporting a more sustainable approach to plastic waste management.
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!