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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Weak Acid Solutions04:02

Weak Acid Solutions

Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
Lewis Acids and Bases02:33

Lewis Acids and Bases

In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
Bronsted-Lowry Acids and Bases02:58

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The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the bromine molecule...
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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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Published on: August 17, 2019

Brønsted Acid-Driven Dynamic LMCT Sites Transform Pt/Zeolite Into a Light-Responsive Oxidation Platform.

Xiaowei Han1, Tangxuan Chen1, Qingqing Zhang1

  • 1State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 8, 2026
PubMed
Summary

This study enhances photocatalysis for efficient oxidation by creating dynamic ligand-to-metal charge transfer (LMCT) sites on Pt/zeolite catalysts. This approach boosts oxygen activation and pollutant degradation using visible light and photothermal effects.

Keywords:
LMCTO2 activationPt complexbrønsted acidphotothermal catalysis

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Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
09:46

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

Area of Science:

  • Catalysis
  • Materials Science
  • Environmental Chemistry

Background:

  • Photocatalysis offers low-temperature oxidation but struggles with inefficient oxygen activation and intermediate utilization compared to thermal catalysis.
  • Conventional Pt/zeolite catalysts have limitations in harnessing light energy for oxidation reactions.

Purpose of the Study:

  • To develop a photothermal-photoelectronic platform for enhanced catalytic oxidation.
  • To improve oxygen activation and utilization of surface intermediates in photocatalysis.
  • To achieve efficient degradation of aromatic hydrocarbons using visible light.

Main Methods:

  • Transformation of Pt/zeolite into a photothermal-photoelectronic platform using Brønsted acid-mediated dynamic ligand-to-metal charge transfer (LMCT) sites.
  • Utilizing toluene oxidation over Pt/ZSM-5 as a model system.
  • Investigating UV-enabled intermediate formation and visible-light-triggered LMCT excitation.

Main Results:

  • Formation of Pt-O-CH2-Ar complexes via acid-assisted deprotonation of benzyl alcohol under UV irradiation.
  • Demonstration of visible-light absorption and O2 activation through the LMCT mechanism by these complexes.
  • Complete degradation of 1000 ppm toluene under light-only conditions with high efficiency (240-480 L g-1 h-1) using only 0.5 wt.% Pt.

Conclusions:

  • A novel strategy merges photothermal and photoelectronic effects for superior catalytic oxidation.
  • Dynamic intermediate coordination effectively boosts light-driven O2 activation.
  • The approach offers a general method for energy-efficient oxidation of aromatic hydrocarbons.