Journal ArticleDOI
Effect of platinum dispersion on the catalytic activity of Pt/Al2O3 for the oxidation of carbon monoxide and propene
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In this article, the effect of Pt dispersion on the catalytic performance of Pt/Al2O3 for CO and C3H6 oxidation was investigated and the intrinsic activity, expressed in terms of turnover frequency (TOF), was found to be almost identical irrespective of the dispersion.Abstract:
Effect of Pt dispersion on the catalytic performance of Pt/Al2O3 for CO and C3H6 oxidation was investigated. The intrinsic activity, expressed in terms of turnover frequency (TOF), for CO oxidation on Pt/Al2O3 catalysts was found to be almost identical irrespective of Pt dispersion. Pt dispersion is the most important factor to determine the CO oxidation activity. On the other hand, the TOF values for C3H6 oxidation on Pt/Al2O3 catalysts were found to increase with increasing the Pt dispersion to 0.20 and then remain almost invariable above DPt = 0.20. In situ FT-IR spectroscopy suggested that acrylate species participates as a reaction intermediate in C3H6 oxidation on Pt/Al2O3 and the formation and reaction behavior of the acrylate species is different depending on the Pt dispersion. The acrylate species formed on Pt/Al2O3 with higher Pt dispersion can readily react with oxygen to form CO2. On the other hand, the reaction of acrylate species is the slow step in the reaction over Pt/Al2O3 with DPt = 0.07. Low TOF values on Pt/Al2O3 with lower Pt dispersion were considered to be due to the inhibition of catalytically active site by accumulation of acrylate species.read more
Citations
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Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources.
TL;DR: This Review systematically documents the progresses and developments made in the understanding and design of heterogeneous catalysts for VOC oxidation over the past two decades and addresses in detail how catalytic performance is often drastically affected by the pollutant sources and reaction conditions.
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Recent advances in VOC elimination by catalytic oxidation technology onto various nanoparticles catalysts: a critical review
TL;DR: In this article, a review of the recent processes and advances on catalytic elimination of VOCs over nanoparticles catalysts is presented, and the perspectives to the scientific issues and challenges faced, as well as the future outlooks are proposed.
Journal ArticleDOI
Highly durable metal ensemble catalysts with full dispersion for automotive applications beyond single-atom catalysts
Hojin Jeong,Ohmin Kwon,Beom-Sik Kim,Junemin Bae,Sangyong Shin,Hee-Eun Kim,Jihan Kim,Hyunjoo Lee +7 more
TL;DR: In this article, a metal (Pt, Pd and Rh) ensemble catalysts with 100% dispersion and a reduced metallic surface state were presented for three-way catalytic reactions, which can provide insights beyond single-atom catalysts for heterogeneous catalysis.
Journal ArticleDOI
Fully Dispersed Rh Ensemble Catalyst To Enhance Low-Temperature Activity.
TL;DR: Rh catalysts were prepared by treating 2 wt % Rh/CeO2 hydrothermally at 750 °C for 25 h, and nearly 100% dispersion was obtained, but the surface Rh atoms were not isolated (denoted as ENS), which exhibited superior activity for low-temperature oxidation.
Journal ArticleDOI
The concept of active site in heterogeneous catalysis
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Journal ArticleDOI
The influence of surface defects on the infrared spectra of adsorbed species
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