Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Reusable Catalyst Makes CH Bond Oxidation Using Oxygen Easier and More Efficient

Abstract:
The selective oxidation of CH bonds using oxygen has become a much simpler and more sustainable endeavor, thanks to a novel manganese (Mn)-based catalyst developed by scientists at Tokyo Institute of Technology (Tokyo Tech). Consisting of reusable Mg6MnO8 nanoparticles with unprecedented surface area, their catalyst enables the desired oxidative reactions to occur at mild temperature and pressure conditions without the need for toxic additives, opening doors to more energy-efficient and environmentally friendly chemistry applications.

Reusable Catalyst Makes CH Bond Oxidation Using Oxygen Easier and More Efficient

Tokyo, Japan | Posted on February 11th, 2022

In the chemical industry, the selective cleavage and oxidation of carbonhydrogen (CH) bonds, called "oxidative CH functionalization" is an essential step in the production of many solvents, polymers, and surfactants, as well as intermediate compounds for agrochemicals and pharmaceuticals. Ideally, one would want to use oxygen (O2) as the only oxidant in this process to avoid using more expensive and environmentally taxing substances, such as hydrogen peroxide (H2O2), chlorine (Cl2), or nitric acid (HNO3).

However, using O2 as the oxidant entails some unresolved problems. While some progress has been made in the field of recoverable and reusable catalysts, most heterogeneous systems require high reaction temperatures, high O2 pressures, or the use of toxic additives. In turn, this cripples the scope of potential applications, scalability, and efficiency of these catalytic systems.

Against this backdrop, a team of scientists from Tokyo Tech, led by Associate Professor Keigo Kamata, recently found a promising catalyst for oxidative CH functionalization. As explained in their paper published in ACS Applied Materials & Interfacesouter, they inferred that isolated manganese (Mn) species fixed in a crystalline matrix could constitute a high-performance heterogeneous catalyst even at mild reaction conditions, based on previous knowledge.

Accordingly, they investigated the catalyst murdochite-type Mg6MnO8, a rock salt structure of magnesium oxide (MgO) with one eighth of the Mg2+ ions replaced with Mn4+ ions and another eighth replaced with vacancies, resulting in a crystal with Mn ions and vacancies orderly occupying alternating layers. Using a cost-effective solgel method aided by malic acid, the team prepared Mg6MnO8 nanoparticles with a very high surface area. Dr. Kamata elaborates: "The specific surface area of our Mg6MnO8 catalyst was 104 m2/g, about seven times higher than that of Mg6MnO8 synthesized using previously reported methods."

The researchers also demonstrated, through numerous experiments, that their Mg6MnO8 nanoparticles could efficiently catalyze the selective oxidation of CH of various alkylarene compounds even under mild reaction conditions, namely 40C and atmospheric pressure. The yield of the final products was also higher than that obtained using existing Mn-based catalysts. To top things off, the Mg6MnO8 nanoparticles could be easily recovered via filtration and then reused without any apparent loss in catalytic activity after multiple cycles.

Finally, the team sought to understand why their proposed catalyst performed so well through a series of kinetic and mechanistic studies. They concluded that the isolation of redox sites (Mn species, in this case) in a crystalline base matrix (MgO) was a particularly important feature to achieve oxidative CH functionalization using O2 at mild conditions.

Satisfied with the results and their findings, Dr. Kamata speculates: "Our approach constitutes a promising strategy for the development of highly efficient heterogeneous oxidation systems with wide substrate scopes."

Let us hope this study paves the way to more efficient and environment-friendly catalysts for organic chemistry applications.

####

Contacts:
Corresponding authors' emails: ;

Further Information

Associate Professor Keigo Kamata

Institute of Innovative Research, Tokyo Institute of Technology

Email

Contact

Public Relations Division, Tokyo Institute of Technology

Email
Tel +81-3-5734-2975

Copyright © Tokyo Institute of Technology

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Reference

Related News Press

News and information

Optical switching at record speeds opens door for ultrafast, light-based electronics and computers: March 24th, 2023

Robot caterpillar demonstrates new approach to locomotion for soft robotics March 24th, 2023

Semiconductor lattice marries electrons and magnetic moments March 24th, 2023

Light meets deep learning: computing fast enough for next-gen AI March 24th, 2023

Chemistry

Recent progress of carbon-based non-noble metal single-atom catalysts for energy conversion electrocatalysis March 3rd, 2023

Scientists push the boundaries of manipulating light at the submicroscopic level March 3rd, 2023

Researchers create a new 3D extra-large pore zeolite that opens a new path to the decontamination of water and gas: A team of scientists with the participation of the CSIC develops an extra-large pore silica zeolite from a silicate chain January 20th, 2023

Dual-site collaboration boosts electrochemical nitrogen reduction on Ru-S-C single-atom catalyst January 6th, 2023

Possible Futures

New experiment translates quantum information between technologies in an important step for the quantum internet March 24th, 2023

Graphene grows and we can see it March 24th, 2023

HKUMed invents a novel two-dimensional (2D) ultrasound-responsive antibacterial nano-sheets to effectively address bone tissue infection March 24th, 2023

A universal HCl-assistant powder-to-powder strategy for preparing lead-free perovskites March 24th, 2023

Discoveries

New experiment translates quantum information between technologies in an important step for the quantum internet March 24th, 2023

Graphene grows and we can see it March 24th, 2023

HKUMed invents a novel two-dimensional (2D) ultrasound-responsive antibacterial nano-sheets to effectively address bone tissue infection March 24th, 2023

A universal HCl-assistant powder-to-powder strategy for preparing lead-free perovskites March 24th, 2023

Announcements

Robot caterpillar demonstrates new approach to locomotion for soft robotics March 24th, 2023

Semiconductor lattice marries electrons and magnetic moments March 24th, 2023

Light meets deep learning: computing fast enough for next-gen AI March 24th, 2023

Bilayer PET/PVDF substrate-reinforced solid polymer electrolyte improves solid-state lithium metal battery performance March 24th, 2023

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

HKUMed invents a novel two-dimensional (2D) ultrasound-responsive antibacterial nano-sheets to effectively address bone tissue infection March 24th, 2023

A universal HCl-assistant powder-to-powder strategy for preparing lead-free perovskites March 24th, 2023

Optical switching at record speeds opens door for ultrafast, light-based electronics and computers: March 24th, 2023

Robot caterpillar demonstrates new approach to locomotion for soft robotics March 24th, 2023

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project