4.6 Article

Unveiling the Role of Atomically Dispersed Active Sites over Amorphous Iron Oxide Supported Pt Catalysts for Complete Catalytic Ozonation of Toluene at Low Temperature

Journal

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 60, Issue 10, Pages 3881-3892

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c05549

Keywords

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Funding

  1. National Key R&D Program of the Ministry of Science and Technology, China [2018YFC0705300]

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The article presents an efficient strategy for the complete decomposition of toluene at normal temperature by constructing a highly dispersed Pt/FeOx catalyst to synergistically ozonate the aromatics. Through a comprehensive experimental study, it was found that atomically dispersed Pt-(OH)(x)(O)-Fe are the active sites for catalytic ozonation of toluene over the Pt/FeOx catalysts. This work enables the destruction of aromatic VOCs at near-ambient conditions in an economical and energy-efficient manner.
Catalytic degradation of volatile organic compounds (VOCs) at normal temperatures is still a great challenge, especially for aromatic hydrocarbons. Here, we present an efficient strategy for the complete decomposition of toluene at normal temperature (50 degrees C), by means of constructing a highly dispersed Pt/FeOx catalyst to synergistically ozonate the aromatics. The amorphous FeOx support enabled high dispersion of Pt species and altered its electronic and coordination environment. As a result, a fast turnover frequency of 4.05 s(-1) was obtained over Pt/FeOx-180 with a high CO2 selectivity of 72.53%. Through comprehensive experimental study, we found atomically dispersed Pt-(OH)(x)(O)-Fe are the active sites for catalytic ozonation of toluene over the Pt/FeOx catalysts. Surface hydroxyl groups and highly dispersed Pt species are the two determining factors for the exceptional catalytic performance at a temperature as low as 50 degrees C, where acid sites effectively facilitate the adsorption of toluene. This work makes the destruction of aromatic VOCs possible at near-ambient conditions in an economical and energy-efficient manner.

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