Impact of Ce-Loading on Ni-catalyst supported over
La
2
O
3
þZrO
2
in methane reforming with CO
2
Samsudeen Olajide Kasim
a
, Ahmed Sadeq Al-Fatesh
a,*
,
Ahmed Aidid Ibrahim
a
, Rawesh Kumar
b
, Ahmed Elhag Abasaeed
a
,
Anis Hamza Fakeeha
a
a
Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421,
Saudi Arabia
b
Sankalchand Patel University, Visnagar, Gujarat, 384315, India
highlights
Ceria promoted showed better catalytic activity and stability for more than 7 h.
Oxygen storage capacity, rapid and repeatable reduction-oxidation cycle are vital.
Sufficient and strong basic sites enhance CO
2
adsorption and promotes dry reforming.
Ce modified catalyst has improved graphitization and less carbon deposits.
Ceria loading of 2.5 wt % was the optimum loading.
article info
Article history:
Received 3 May 2020
Received in revised form
24 July 2020
Accepted 19 August 2020
Available online xxx
Keywords:
Lanthanum-Zirconia support
Nickel doped
Ceria promoter
Basic sites
Reducible NiO
abstract
This paper investigated the effect of doping Ni supported catalysts with different ceria
loading. The catalysts (5%Niþx%Ce/La
2
O
3
þZrO
2
, where x ¼ 0, 1, 2, 2.5, 3, 5) were synthe-
sized via the wet impregnation technique and tested for methane reforming with carbon
dioxide at atmospheric pressure, 700
C and 42, 000 ml/g
cat
.h gas hourly space velocity. The
fresh catalysts were subjected to different characterization techniques such as X-ray
diffraction, Surface area and pore analysis, H
2
-temperature programmed reduction, CO
2
-
temperature programmed desorption and thermogravimetric analysis (TGA). A fine cor-
relation between characterization results and catalytic activity is found. The results of the
reactions indicated that 5%Ni/La
2
O
3
þZrO
2
has the lowest conversion which increased with
the percentage loading of CeO
2
up to 2.5 wt % and then began to decline. This suggests that
2.5 wt % loading is the optimum for CH
4
and CO
2
conversion. This particular catalyst
composition has NiO species that could be reduced easily, as well as dense and wide dis-
tribution of all type of basic sites with respect to other catalyst system. The used catalysts
were again subjected to TGA and RAMAN analysis where the least carbon deposition and
the least deactivation factor was observed for 5%Niþ5%Ce/La
2
O
3
þZrO
2
catalysts.
© 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
* Corresponding author.
E-mail address: aalfatesh@ksu.edu.sa (A.S. Al-Fatesh).
Available online at www.sciencedirect.com
ScienceDirect
journal homepage: www.elsevier.com/locate/he
international journal of hydrogen energy xxx (xxxx) xxx
https://doi.org/10.1016/j.ijhydene.2020.08.289
0360-3199/© 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Please cite this article as: Kasim SO et al., Impact of Ce-Loading on Ni-catalyst supported over La
2
O
3
þZrO
2
in methane reforming with
CO
2
, International Journal of Hydrogen Energy, https://doi.org/10.1016/j.ijhydene.2020.08.289