Methanol oxidation on sputter-coated platinum oxide catalysts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10334060" target="_blank" >RIV/00216208:11320/16:10334060 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9XMuHn2CFI" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9XMuHn2CFI</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijhydene.2015.09.147" target="_blank" >10.1016/j.ijhydene.2015.09.147</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Methanol oxidation on sputter-coated platinum oxide catalysts

Popis výsledku v původním jazyce

Platinum oxide (PtOx) and metallic platinum (Pt) layers deposited by means of radio frequency (rf) magnetron sputtering were examined as potential catalysts for partial oxidation of methanol (POM) reaction (CH3OH + 1/2O(2)-&gt; 2H(2) + CO2) under realistic conditions. Flat Si(100) support and oxygen-plasma etched amorphous carbon films (a-C) were used as substrates for PtOx. Elemental composition and morphology of the catalysts were characterized by x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XPS analysis of PtOx demonstrates change in its chemical state during the reaction leading to metallic layer with small amounts of stable Pt2+ cations which turns out to be crucial for its catalytic properties, while SEM reveals significant cracking and roughening of the oxide thin films. A reference Pt/Si catalyst, on the contrary, shows&quot; no significant differences prior and after the methanol oxidation reaction but lacks to PtOx in both activity (in terms of H-2 production rate) and selectivity for POM, generating relatively high amounts of CO which can poison the catalyst surface. PtOx deposited on the porous a-C outperforms the same oxide grown directly on Si, especially in its POM selectivity exceeding 90%. Both oxidic systems, however, require an initial conditioning under real reaction conditions to reach their optimal catalytic capability. (C) Copyright 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Název v anglickém jazyce

Methanol oxidation on sputter-coated platinum oxide catalysts

Popis výsledku anglicky

Platinum oxide (PtOx) and metallic platinum (Pt) layers deposited by means of radio frequency (rf) magnetron sputtering were examined as potential catalysts for partial oxidation of methanol (POM) reaction (CH3OH + 1/2O(2)-&gt; 2H(2) + CO2) under realistic conditions. Flat Si(100) support and oxygen-plasma etched amorphous carbon films (a-C) were used as substrates for PtOx. Elemental composition and morphology of the catalysts were characterized by x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XPS analysis of PtOx demonstrates change in its chemical state during the reaction leading to metallic layer with small amounts of stable Pt2+ cations which turns out to be crucial for its catalytic properties, while SEM reveals significant cracking and roughening of the oxide thin films. A reference Pt/Si catalyst, on the contrary, shows&quot; no significant differences prior and after the methanol oxidation reaction but lacks to PtOx in both activity (in terms of H-2 production rate) and selectivity for POM, generating relatively high amounts of CO which can poison the catalyst surface. PtOx deposited on the porous a-C outperforms the same oxide grown directly on Si, especially in its POM selectivity exceeding 90%. Both oxidic systems, however, require an initial conditioning under real reaction conditions to reach their optimal catalytic capability. (C) Copyright 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Hydrogen Energy

ISSN

0360-3199

e-ISSN

—

Svazek periodika

41

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

265-275

Kód UT WoS článku

000368955300027

EID výsledku v databázi Scopus

2-s2.0-84954553033