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Heterogeneous Catalysis

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...

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

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Atomic layer deposition overcoating: tuning catalyst selectivity for biomass conversion.

Hongbo Zhang¹, Xiang-Kui Gu, Christian Canlas

¹Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439 (USA) http://www.iact.anl.gov.

Angewandte Chemie (International Ed. in English)

|September 25, 2014

Summary

This summary is machine-generated.

Atomic layer deposition precisely covers palladium nanoparticle step sites, enhancing selectivity for furan production in furfural hydrogenation. This method offers precise control over catalytic reactions.

Keywords:

atomic layer deposition biomass catalyst selectivity hydrogenation palladium

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Area of Science:

Heterogeneous catalysis
Nanoparticle surface chemistry
Surface science

Background:

Nanoparticle active sites (terraces, edges, facets) influence catalytic reaction outcomes.
Controlling active site accessibility is crucial for tuning product selectivity.

Purpose of the Study:

To precisely control active sites on palladium nanoparticles (NPs) using atomic layer deposition (ALD).
To investigate the effect of controlled site modification on furfural hydrogenation selectivity.
To elucidate the reaction mechanism through experimental and computational approaches.

Main Methods:

Atomic layer deposition (ALD) for selective overcoating of palladium nanoparticle step sites.
Furfural hydrogenation reaction studies.
Density Functional Theory (DFT) calculations for mechanistic insights.

Main Results:

ALD overcoating precisely blocked palladium NP step sites while leaving terrace sites active.
Increased overcoat thickness enhanced selectivity towards furan production.
A linear correlation was observed between furan selectivity and furfural conversion, with varying slopes based on overcoating.

Conclusions:

ALD is an effective technique for tuning selectivity in furfural hydrogenation over Pd NPs.
The study provides a deeper understanding of the reaction mechanism by controlling active site accessibility.
Precise surface modification of nanoparticles enables targeted catalytic outcomes.