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

被引:35
作者
Araujo, Jesuina C. S. [1 ]
Oton, Lais F. [1 ,2 ]
Oliveira, Alcineia C. [2 ]
Lang, Rossano [3 ]
Otubo, Larissa [4 ]
Bueno, Jose M. C. [5 ]
机构
[1] Univ Fed Espirito Santo, Ctr Univ Norte Espirito Santo, Sao Mateus, ES, Brazil
[2] Univ Fed Ceara, Dept Quim Analit & Fis Quim, Campus Pici,Bloco 940, Fortaleza, Ceara, Brazil
[3] Univ Fed Sao Paulo UNIFESP, ICT, 330 Talim St, BR-12231280 Sao Jose Dos Campos, SP, Brazil
[4] IPEN, CCTM, BR-05508000 Sao Paulo, SP, Brazil
[5] Univ Fed Sao Carlos, CP 676, BR-13565905 Sao Carlos, SP, Brazil
关键词
Methane; Oxidation; Alumina; Platinum; Nanostructured; CO-DRIFTS; SYNGAS PRODUCTION; PLATINUM; PD; TEMPERATURE; PERFORMANCE; CONVERSION; PT/AL2O3; METAL;
D O I
10.1016/j.ijhydene.2019.08.176
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of the Pt loadings and particles sizes on the stability of Pt(x wt%)/Al2O3 catalysts were investigated in the partial oxidation of methane (POM) reaction. The Al2O3 support was prepared by sol-gel method and different Pt loadings, varying from 0.5 to 2.0 wt% were incorporated to alumina through the incipient wetness impregnation method. The physicochemical features of the catalysts were determined by XRD, ICP-OES, Nitrogen-sorption, UV-Visible, H-2-TPR, CO-DRIFTS, SEM-EDS, XPS and HRTEM techniques. The metal dispersion was evaluated in the cyclohexane dehydrogenation reaction. Lower Pt loadings resulted in well dispersed Pt-o nanoparticles with an enhanced activity in cyclohexane dehydrogenation and POM reactions. With increasing Pt loading to 2.0 wt%, the Pt nanoparticles of the Pt(2.0 wt%)/Al2O3 showed a methane conversion of 63% in 24 h of time on stream, and the catalyst was very selective to H-2 and CO. Based on the HRTEM, XPS and Raman spectroscopy techniques, an increment in the Pt loadings evidenced an enrichment of Pt-o clusters on the surface, however, no heavy carbon deposits formation was observed. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:27329 / 27342
页数:14
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