Effect of the Support Composition on the Physicochemical Properties of Ni/Ce1–xLaxOy Catalysts and Their Activity in an Autothermal Methane Reforming Reaction
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Translated
|
| Journal |
Kinetics and Catalysis
ISSN: 0023-1584
, E-ISSN: 1608-3210
|
| Output data |
Year: 2017,
Volume: 58,
Number: 5,
Pages: 610-621
Pages count
: 12
DOI:
10.1134/S0023158417050160
|
| Tags |
autothermal reforming, cerium dioxide, methane, Ni catalysts, synthesis gas |
| Authors |
Matus E.V.
1
,
Nefedova D.V.
1,2
,
Kuznetsov V.V.
1
,
Ushakov V.A.
1
,
Stonkus O.A.
1,3
,
Ismagilov I.Z.
1
,
Kerzhentsev M.A.
1
,
Ismagilov Z.R.
1,4
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
|
| 2 |
Novosibirsk State Technical University, Novosibirsk, 630073 Russia
|
| 3 |
National Research Novosibirsk State University, Novosibirsk, 630090 Russia
|
| 4 |
Institute of Coal Chemistry and Chemical Materials Science, Siberian Branch, Russian Academy of Sciences, Kemerovo, 650000 Russia
|
|
Funding (1)
|
1
|
Federal Agency for Scientific Organizations
|
0303-2016-0004
|
The effect of the Ce1 – xLaxOy (x = 0–1, 1.5 ≤ y ≤ 2.0) support composition on the physicochemical
properties of supported Ni catalysts and their activity in autothermal methane reforming was studied. The textural
and structural characteristics of Ce1–xLaxOy and Ni/Ce1–xLaxOy samples and the process of their
reduction in an atmosphere of hydrogen were examined using a set of techniques (low-temperature nitrogen
adsorption, X-ray diffraction analysis, transmission electron microscopy, and thermal analysis). It was established
that the Ce1–xLaxOy supports (x = 0–0.9) are mesoporous materials containing a fluorite-like solid
solution based on cerium dioxide, in which the unit cell parameter increases and the average crystallite size
decreases with the mole fraction of La. It was shown that the average size and composition of Ni-containing
particles in the Ni/Ce1–xLaxOy catalysts depends on the composition of the support: at x = 0–0.8, a phase of
NiO was formed, whereas a phase of LaNiO3 was formed at x = 0.9–1. The dispersity of the active constituent
and its stability to agglomeration increased as the mole fraction of La in the Ce1–xLaxOy support was
increased from 0 to 0.8, whereas the reduction of Ni-containing oxide particles shifted to the higher temperature
region. The Ni/Ce1–xLaxOy catalysts provided high methane conversion (96–100%) and the yield of H2
(35–55%). The yield of hydrogen increased with decreasing the mole fraction of La in the Ce1–xLaxOy support
composition; this can be caused by a decrease in the fraction of difficult-to-reduce Nin+ cations due to
the weakening of metal–support interactions.