Performance comparison of microwave and conventionally heated reactors for sorption enhanced reforming of ethanol over Ni impregnated SBA-15

Hydrogen production from steam reforming of ethanol (SRE) and sorption enhanced steam reforming of ethanol (SESRE) over nickel impregnated SBA-15 catalyst was investigated in both conventionally and microwave heated reactor systems. Characterization results showed that 10 wt% Ni loaded SBA-15 exhibited Type IV isotherm with H1 hysteresis, which indicates mesoporous structure. Its surface area and mean pore diameter values were 493 m(2)/g and 6.5 nm, respectively. Results obtained in SRE tests showed high activity of this catalyst. With the change in the heating mechanism from conventionally heated reactor to microwave heated reactor, hydrogen yield value increased from 3.5 to 4.5 where the maximum possible hydrogen yield value is six for the SRE reaction. Capture of CO2 with CaO resulted in higher hydrogen purity and lower CO and CO2 amount in the gas mixture in the first 100 min in both heating systems. With in-situ capture of CO2, the hydrogen purity reached to 90% with negligible CO and CO2 in the first 40 min in microwave heated reactor. TGA results revealed that while conventional heating caused 45% coke formation, the coke formation was only 3% in microwave heated reactor. Highly steady reactor performance, with coke minimization could be achieved as a result of performing activity tests in the system which was heated by a focused microwave reactor.


Steam reforming of ethanol with zirconia incorporated mesoporous silicate supported catalysts
ARSLAN KELAM, ARZU; Gunduz, Seval; Doğu, Timur (2014-10-31)
Steam reforming of ethanol is a promising route for the production of high purity hydrogen. Ni impregnated zirconia, with high chemical and thermal stability and high water adsorption-dissociation capability is an attractive catalyst for this reaction. In the present study, mesoporous zirconia and high surface area zirconia/silicate structured materials, such as Zr-SBA-15 and Zr-MCM-41, were synthesized following hydrothermal routes, using different surfactants as the structure directing templates. Surface ...
Hydrogen production over molybdenum loaded mesoporous carbon catalysts in microwave heated reactor system
Guler, Melih; Doğu, Timur; VARIŞLI, DİLEK (2017-12-15)
Ammonia decomposition reaction to produce COx free hydrogen over molybdenum incorporated mesoporous carbon based catalysts was studied in a microwave heated reactor system. Mesoporous carbon is acting as the catalyst support as well as the microwave receptor in the reaction medium. While the highest conversion value was 49% in conventionally heated reaction system at 600 degrees C, total conversion value was achieved over the same catalyst at 400 degrees C in microwave heated system with a GHSV of 36,000 ml...
Effect of calcination/reduction temperature of Ni impregnated CeO2-ZrO2 catalysts on hydrogen yield and coke minimization in low temperature reforming of ethanol
ARSLAN KELAM, ARZU; Doğu, Timur (2016-10-15)
CeO2-ZrO2 was proven to be a quite effective catalyst support for steam reforming of ethanol (SRE). In this study, properties of Ni impregnated mesoporous CeO2-ZrO2 catalysts of different compositions were optimized by changing the calcination/reduction temperature. Increase of calcination/reduction temperature from 400 degrees C to 650 degrees C caused significant decrease in surface area and redox ability of the catalysts, yielding higher coke formation and lower hydrogen yields. Results proved that, very...
Continuous synthesis of graphite with tunable interlayer distance
ÇAKMAK, GÜLHAN; Öztürk, Tayfur (2019-06-01)
A study was carried out to produce graphite with controlled interlayer distance synthesized from methane using hydrogen as modifying agent. The synthesis was carried out in radio frequency (r.f.) thermal plasma where the methane-to-hydrogen ratio varied systematically over a wide range. The synthesized materials were investigated in terms of structure, morphology and the interlayer distance. It is found that there is a critical fraction of hydrogen, around half of that of methane flow rate, up to which it i...
Sorption-Enhanced Reforming of Ethanol over Ni- and Co-Incorporated MCM-41 Type Catalysts
Gunduz, Seval; Doğu, Timur (2012-07-04)
Ni- and Co-incorporated MCM-41 type mesoporous materials with Ni/Si and Co/Si molar ratios of 0.12 were synthesized, characterized, and tested in both steam reforming of ethanol (SRE) and sorption-enhanced steam reforming of ethanol (SESRE) reactions. Characterization results showed that Co and Ni were successfully incorporated and well-dispersed in the mesoporous MCM-41 support. Ni- and Co-incorporated MCM-41 catalysts had surface area values of 449.0 and 303.6 m(2)/g, respectively. They also had narrow po...
Citation Formats
M. Sarıyer, N. A. Sezgi, and T. Doğu, “Performance comparison of microwave and conventionally heated reactors for sorption enhanced reforming of ethanol over Ni impregnated SBA-15,” CHEMICAL ENGINEERING JOURNAL, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: