RETRACTED ARTICLE: Effect of the support on the mechanism of partial oxidation of methane on platinum catalysts

Abstract

temperature programmed surface reaction (TPSR) studies showed partial oxidation of methane comprehends two steps: combustion of methane followed by CO 2 , and steam reforming of unreacted methane, while for Pt/Y 2 O 3 a direct mechanism was observed. Oxygen Storage Capacity (OSC) evaluated the reducibility and oxygen transfer capacity of the catalysts. Pt/CeO 2 catalyst showed the highest stability on partial oxidation. The results were explained by the higher reducibility and oxygen storage/release capacity which allowed a continuous removal of carbonaceous deposits from the active sites, favoring the stability of the catalyst, For Pt/Al 2 O 3 and Pt/ZrO 2 catalysts the increase of carbon deposits around or near the metal particle inhibits the CO 2 dissociation on CO 2 reforming of methane. Pt/Y 2 O 3 was active and stable for partial oxidation of methane, and its behavior was explained by a change in the reaction mechanism.

Sour water–gas shift reaction over Pt/CeZrO2 catalysts

“…This redox property is enhanced with zirconia incorporation into the ceria lattice, which increases oxygen vacancies of the support and therefore increases its reducibility. The improvement of oxygen vacancies is due to the high oxygen mobility of the solid solution identified in the XRD analysis [37,38]. Fig.…”

“…Then the samples were cooled to 450°C, which was the analysis temperature. A 5% O 2 /He mixture was passed through the catalyst to verify the oxygen consumption, while the composition of the reactor effluent was measured by monitoring the oxygen signal (m/z = 32) with the mass spectrometer [37,38].…”

“…The oxygen storage capacity of catalysts was evaluated early [37,38] and the results are presented in Table 1. The results for ceria-free Pt catalysts and ceria-containing catalysts were very distinct.…”

Recent Developments in the Partial Oxidation of Methane to Syngas

“…The higher reducibility and oxygen storage/release capacity of Pt/Ce x Zr (1-x) O 2 catalysts promotes the continuous removal of carbonaceous deposits from the active sites, which takes place at the metal-support interfacial perimeter [42]. For Al 2 O 3 -, ZrO 2 -, CeO 2 -and Y 2 O 3 -supported Pt catalysts, the Pt/CeO 2 system showed the highest stability in the POM reaction due to the higher reducibility and oxygen storage/release capacity which allowed a continuous removal of carbonaceous deposits from the active sites [43]. This reaction has also been studied over Rh supported on Ce oxide with Zr, Gd and La.…”

Size Dependent Study of MeOH Decomposition Over Size-selected Pt Nanoparticles Synthesized via Micelle Encapsulation

“…Pt nanocatalysts have been proven to be exceptionally active and selective for many industrially relevant chemical reactions including hydrogen evolution [17], methanol decomposition [18], the partial oxidation of methane [19], ethylene hydrogenation [20], and the abatement of automobile emissions, which includes CO oxidation as well as the reduction of hydrocarbons and NO x [21]. The nanoparticle synthesis method of micelle encapsulation allows precise control over the size, shape, and spatial distribution of particles [15], making it an attractive candidate for the synthesis of monodispersed nanocatalysts.…”