Controlling the Phase Transformation of Alumina for Enhanced Stability and Catalytic Properties

Author:

Jang Sejin1,Gun Oh Dong1,Kim Haneul1,Hyun Kim Kwang1,Khivantsev Konstantin2,Kovarik Libor2,Hun Kwak Ja1ORCID

Affiliation:

1. School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea

2. Institute for Integrated Catalysis Pacific Northwest National Laboratory Richland WA 99352 USA

Abstract

AbstractCurrent transition alumina catalysts require the presence of significant amounts of toxic, environmentally deleterious dopants for their stabilization. Herein, we report a simple and novel strategy to engineer transition aluminas to withstand aging temperatures up to 1200 °C without inducing the transformation to low‐surface‐area α‐Al2O3 and without requiring dopants. By judiciously optimizing the abundance of dominant facets and the interparticle distance, we can control the temperature of the phase transformation from θ‐Al2O3 to α‐Al2O3 and the specific surface sites on the latter. These specific surface sites provide favorable interactions with supported metal catalysts, leading to improved metal dispersion and greatly enhanced catalytic activity for hydrocarbon oxidation. The results presented herein not only provide molecular‐level insights into the critical factors causing deactivation and phase transformation of aluminas but also pave the way for the development of catalysts with improved activity for catalytic hydrocarbon oxidation.

Publisher

Wiley

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