Issue 55, 2017
From the journal:

RSC Advances

Methane combustion over Pd/CoAl2O4/Al2O3 catalysts prepared by galvanic deposition†

Yuji Mahara, ORCID logo a   Takumi Tojo,a   Kazumasa Murata,a   Junya Ohyama ORCID logo ab  and  Atsushi Satsuma ORCID logo *ab  

* Corresponding authors

a Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
E-mail: satsuma@chembio.nagoya-u.ac.jp

b Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Kyoto 615-8530, Japan

Abstract

Pd/CoAl2O4/Al2O3 methane combustion catalysts were synthesized using a galvanic deposition (GD) method (PdCoAl-GD). This PdCoAl-GD catalyst showed higher activities and turnover frequencies (TOFs) than conventional Pd/Al2O3. According to X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) and scanning transmission electron microscopy (STEM) measurements, PdCoAl-GD was composed of a CoAl2O4 phase supported on γ-Al2O3 and dispersed Pd nanoparticles of 2–7 nm in size on CoAl2O4. Operando Pd K-edge XAFS measurements indicated that the Pd in PdCoAl-GD was oxidized to highly active methane combustion PdO species at low temperatures. PdCoAl-GD also showed high activity (light-off tests) when PdO was initially present on the catalysts. Methane temperature-programmed reaction (CH4-TPR) measurements on PdCoAl-GD revealed that PdO was reduced by CH4 at low temperatures. The GD method used herein achieved PdO species that were effective for C–H activation.

Graphical abstract: Methane combustion over Pd/CoAl2O4/Al2O3 catalysts prepared by galvanic deposition

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Article information

DOI
https://doi.org/10.1039/C7RA06150A
Article type
Paper
Submitted
02 Jun 2017
Accepted
03 Jul 2017
First published
11 Jul 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 34530-34537

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Methane combustion over Pd/CoAl2O4/Al2O3 catalysts prepared by galvanic deposition

Y. Mahara, T. Tojo, K. Murata, J. Ohyama and A. Satsuma, RSC Adv., 2017, 7, 34530 DOI: 10.1039/C7RA06150A

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