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Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

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Light-driven methane conversion: unveiling methanol using a TiO₂/TiOF₂ photocatalyst.

Wibawa Hendra Saputera^1,2,3, Gita Yuniar¹, Dwiwahju Sasongko^1,3

¹Department of Chemical Engineering, Research Group on Sustainable Energy and Technology, Faculty of Industrial Technology, Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung 40132 Indonesia whsaputera@itb.ac.id.

|March 18, 2024

Summary

A novel TiO2/TiOF2 composite enhances photocatalytic methane to methanol conversion. Optimizing factors like catalyst composition and electron scavengers significantly boosts methanol yield, with silver incorporation further improving performance.

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Area of Science:

Materials Science
Catalysis
Photochemistry

Background:

Efficient conversion of methane to methanol is crucial for energy applications.
Developing advanced photocatalysts with tailored properties is key to improving this conversion process.

Purpose of the Study:

To synthesize and characterize a TiO2/TiOF2 composite for photocatalytic methane to methanol conversion.
To optimize reaction conditions and understand the synergistic effects of various components.

Main Methods:

Hydrothermal synthesis of TiO2/TiOF2 composite.
Characterization using XRD, Raman, UV-vis, SEM-EDX, TEM, and N2 adsorption-desorption.
Statistical evaluation of photocatalyst, electron scavenger (FeCl2), and H2O2.

Main Results:

Controlled synthesis of TiO2/TiOF2 with adjustable [001] facet exposure and composition.
Identified significant synergistic effects of catalyst, FeCl2, and H2O2, leading to enhanced methanol production.
Achieved a maximum methanol yield of 0.7257 μmole h-1 gcat-1, with a 2.2-fold increase upon Ag incorporation.

Conclusions:

The TiO2/TiOF2 composite, particularly with exposed [001] facets and fluorine, effectively promotes methane to methanol conversion.
The Fenton cycle involving FeCl2 and H2O2 plays a vital role in reducing charge recombination and extending carrier lifetime.
Hydroxyl radicals are critical intermediates in the photocatalytic mechanism, underscoring their importance for process efficiency.