On the role of size controlled Pt particles in nanostructured Pt-containing Al2O3 catalysts for partial oxidation of methane

Araújo, Júlio; Oton, Lais F.; Oliveira, Alcinéia C.; Lang, Rossano; Otubo, Larissa; Bueno, J.M.C.

doi:10.1016/j.ijhydene.2019.08.176

Cited by 30 publications

(28 citation statements)

References 33 publications

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“…In agreement, the BE for O 1s core level reveals peaks at 530.4 and 532.0 eV, which are associated to surface oxygen groups. The peak at 530.4 eV is assigned to be from C-O/C=O and Me-O functional groups while the peak at 532.0 eV can be attributed to the presence of other carboxylic species bonded to the OH functional groups [35]. Moreover, a slight increase in the oxygen content after the catalytic test is observed (Table 3) in comparison to the fresh Pt-containing solid.…”

Section: Surface Acidity and Oxidation Statesmentioning

confidence: 96%

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

et al. 2020

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Doubly promoted MeMo/Nb2O5 catalysts, in which Me = Pt, Ni, or Co oxides were prepared for the selective catalytic reduction of NOx by CO reaction (CO-SCR). Comparable chemical, textural, and structural analyses revealed similarities between NiMo and CoMo impregnated on Nb2O5, in contrast to PtMo sites, which were not homogeneously dispersed on the support surface. Both the acid function and metal dispersion gave a synergistic effect for CO-SCR at moderate temperatures. The reactivity of PtMo catalysts towards NOx and CO chemisorption was at low reaction temperatures, whereas the NOx conversion over CoMo was greatly improved at relatively high temperatures. Careful XPS, NH3-TPD, and HRTEM analyses confirmed that the large amounts of strong and moderate acid sites from PtOx entrapped on MoO3 sites induced high NOx conversions. NiMo/Nb2O5 showed poor performance in all conditions. Poisoning of the MeMo sites with water vapor or SO2 (or both) provoked the decline of the NOx conversions over NiMo and PtMo sites, whereas the structure of CoMo ones remained very active with a maximum NOx conversion of 70% at 350 °C for 24 h of reaction. This was due to the interaction of the Co3+/Co2+ and Mo6+ actives sites and the weak strength Lewis acid Nb5+ ones, as well.

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Section: Surface Acidity and Oxidation Statesmentioning

confidence: 96%

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

et al. 2020

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“…Based on our results, higher activities of Cr/Al catalysts can be related with smaller metal particle sizes and distribution of chromium on alumina. The influence of metal particle size in methane conversion was also reported by some reseachers [29][30]. Chromium is known as the most efficient catalyst in oxidation, other catalysts displayed comparable or even lower activity compared with alumina-supported chromium catalyst [31].…”

Section: Characterization Of the Catalystsmentioning

confidence: 58%

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Mardwita

Yusmartini

Wisudawati

2020

Bull. Chem. React. Eng. Catal.

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A series of alumina supported cobalt and chromium catalysts with different metal loadings were prepared by impregnation method. Six types of alumina supported cobalt and chromium catalysts contained 5 wt%, 10 wt%, and 15 wt% loadings were produced and tested in methane oxidation. The catalysts were characterized by using x-ray diffraction (XRD) and carbon monoxide chemisorption (CO chemisorption). The XRD results do not confirmed any features of cobalt and chromium metal. The metal sizes for both catalysts were larger in high loading as shown by CO chemisorption results. Methane conversion results showed that the conversion increases with increasing the metal loading, however supported chromium catalysts were higher in activities compared to supported cobalt catalysts. Thermal stability tests on 15 wt% Co/Al and 15 wt% Cr/Al catalyst showed that supported chromium catalyst is more stable and maintain the particle size due to its strong interaction with support, while supported cobalt catalyst decrease in methane conversion due to deactivation of the catalyst. Copyright © 2020 BCREC Group. All rights reserved

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“…In contrast, the H 2 -TPR profile of 1.5Pt/Al 2 O 3 showed a large reduction peak at approximately 335 °C, which was accompanied by the peak at lower temperature shifting to 200 °C. The peak at the lower temperature was ascribed to the reduction of PtO x species (e.g., [Pt IV (OH) 4 Cl 2 ] s ) which had a weak interaction with the Al 2 O 3 support, and the peak at high temperature was derived from the reduction of PtO x Cl y species which strongly interacted with alumina (Pt n+ –O–Al). − Thus, these results implied the apparent existence of the different Pt species in 1.5Pt/Al 2 O 3 , where the partial Pt species weakly interacted with the support and other Pt species strongly interacted with the support. However, almost all the Pt species in these catalysts with lower Pt loadings (0.25Pt/Al 2 O 3 , 0.5Pt/Al 2 O 3 , and 1.0Pt/Al 2 O 3 ) had a weak interaction with the support.…”

Section: Resultsmentioning

confidence: 96%

Efficient Synthesis of a Nonlinear C5 1,3-Diol from Butanone and Formalin under Mild Conditions for Isoprene Production

Liu

Cui

et al. 2020

ACS Sustainable Chem. Eng.

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On the role of size controlled Pt particles in nanostructured Pt-containing Al2O3 catalysts for partial oxidation of methane

Cited by 30 publications

References 33 publications

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Efficient Synthesis of a Nonlinear C5 1,3-Diol from Butanone and Formalin under Mild Conditions for Isoprene Production

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