In Situ DRIFTS and NAP-XPS Exploration of the Complexity of CO2 Hydrogenation over Size-Controlled Pt Nanoparticles Supported on Mesoporous NiO

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10389406" target="_blank" >RIV/00216208:11320/18:10389406 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1021/acs.jpcc.8b00061" target="_blank" >https://doi.org/10.1021/acs.jpcc.8b00061</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.8b00061" target="_blank" >10.1021/acs.jpcc.8b00061</a>

Result language

angličtina

Original language name

In Situ DRIFTS and NAP-XPS Exploration of the Complexity of CO2 Hydrogenation over Size-Controlled Pt Nanoparticles Supported on Mesoporous NiO

Original language description

Pt nanoparticles (4.8 nm) were anchored onto the surface of mesoporous nickel oxide (NiO) supports. Pt/NiO samples were compared with pristine NiO and Pt/SBA-15 silica catalysts in CO2 hydrogenation to form carbon monoxide, methane, and ethane at 473-673 K. Pt/NiO (1%) samples were similar to 20 times and,similar to 1.5 times more active at 493 K compared with Pt/SBA-15 and NiO catalysts, respectively. However, the Pt-free NiO support has an activity of 120% compared to that of Pt/NiO catalysts at 673 K. In the case of 1% Pt/SBA-15 catalyst, the selectivity toward methane was 13%, whereas it was 90 and 98% for NiO and 1% Pt/NiO at 673 K, respectively. Exploration of the results of the reactions was performed by near-ambient pressure X-ray photoelectron spectroscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy. In the case of pure NiO, we found that the surface of the support was mainly covered by elemental Ni under reaction conditions, where the Ni/NiOx system is responsible for the high activity of the Pt-free catalyst. In the case of Pt/NiO, Pt improves the reduction of NiO toward metallic Ni. In the case of 1% Pt/NiO catalysts, the presence of limited amount of Pt resulted in an optimal quantity of the oxidized Pt fraction at 673 K, showing the presence of a Pt/PtOx/Ni/NiOx mixed phase where the different interfaces may be responsible for the high activity and selectivity toward methane. In the case of pure NiO under reaction conditions, small amounts of formaldehyde and hydrogen-perturbed CO [H-n CO (n = 1, 2)] were detected. However, in the case of 1% Pt/NiO catalysts, besides the absence of formaldehyde, a significant amount of H-n CO (n = 2-3) was present on the surface, responsible for the high activity and methane selectivity.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/LM2015057" target="_blank" >LM2015057: Surface Physics Laboratory – Materials Science Beamline</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

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

Name of the periodical

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Volume of the periodical

122

Issue of the periodical within the volume

10

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

5553-5565

UT code for WoS article

000428003300036

EID of the result in the Scopus database

2-s2.0-85044168334