Name
Address
Title
Author-s
Department
Major
citation
Year of
Publication
Publisher
Sponsor
Type of
Publication
Dr. Ahmed Sadeq Al-Afatesh
Office: 1C 56
Tel: 00966-1-467-6859
Email: aalfatesh @ksu.edu.sa
PO Box 800, King Saud University
Riyadh 11421 , Kingdom of Saudi Arabia
Catalyst Study for the Conversion of Greenhouse Gases into Useful Products
Ahmed S. A. Al-Fatesh
Chemical Engineering
Chemical Engineering
First Annual International Conference –Ibb 2010 (Environmental Science and Technology)1-3
August, (2010 ).
2010
Yemen
Conference paper
ISSN
URI/DOI
Full Text
(Yes,No)
Key words
Abstract
Yes
Activation, CH4, CO2, Dry reforming, Ni/-Al2O3 , Ni/-Al2O3 catalysts
Dry reforming reactions have important environmental and economical implications, since they
can utilize both methane & carbon dioxide which are considered as greenhouse gases that cause
global warming and produce useful chemical products such as H2 and CO commonly known as
synthesis gases. These gases can be used as feedstock for numerous chemicals and fuels
besides, being sources for pure hydrogen and carbon monoxide. An experimental investigation
was carried out to prepare suitable catalysts for dry reforming reaction using Nickel based
catalyst prepared by impregnation method. Alumina (-Al2O3 low surface area, γ-Al2O3 high
surface area} were used as supports. The study investigated the effect of activating the catalysts
with different gas-media and temperatures while maintaining the applied calcination
temperature at 900˚C. The prepared catalyst were tested in a micro reactor at atmospheric
pressure, flow rate of 33 ml/min and various reaction temperatures in the range of 500-800˚C.
The effluents were analyzed using an online gas chromatograph equipped with a TCD.
Influence of catalyst activity, carbon yield, stability, coke deposition and synthesis gas ratio
(H2/CO) were studied. Spent and fresh catalysts were characterized by XRD, SEM and TGA
techniques. It was observed that, calcination followed by activation of catalyst is essential for
the process of reforming. The highest performances were achieved activating both 3 wt% Ni/Al2O3 and 1 wt% Ni/-Al2O3 catalysts at 700C for 2 hr. The % conversions of CH4 and CO2
obtained were 86.8 and 87.7 respectively for 3 wt% Ni/-Al2O3. While for 1 wt% Ni/-Al2O3,
the % conversions of CH4 and CO2 obtained were 84.6 and 89.4 respectively. On the other
hand, nickel chloride precursor provided less activation performance than nickel nitrate
precursor in the preparation of 1 wt% Ni/-Al2O3. The % conversions of CH4 and CO2 obtained
at 700C reaction temperature were 49.0 and 50.0 respectively using nickel chloride precursor,
while the % conversions of CH4 and CO2 obtained at 700C reaction temperature using nickel
nitrate gave 62.9 and 72.3 respectively. It was also found using 1 wt% Ni/-Al2O3 catalyst that
activation media with H2 gas gave better performance than CH4. The % conversions of CH4 and
CO2 obtained at 800C reaction temperature were 84.6 and 89.4 respectively using H 2 and 65.6
and 70.7 respectively using CH4.