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

Date

2019-12-01

Author

Sarıyer, Merve
Sezgi, Naime Aslı
Doğu, Timur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

187
views

0
downloads

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.

Subject Keywords

Microwave-assisted reactions, Hydrogen, Ethanol steam reforming, Sorption enhanced reforming, Nickel, SBA-15

URI

https://hdl.handle.net/11511/31066

Journal

CHEMICAL ENGINEERING JOURNAL

DOI

https://doi.org/10.1016/j.cej.2018.10.075

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

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...
HYBRID CATALYTIC COMBUSTION OF METHANE/HYDROGEN MIXTURES Cimino, S.; Allouis, Christophe Gerard; Mancino, G.; Nigro, R. (2014-05-01) Hybrid catalytic combustion technology, which is a staged process comprising a preliminary catalytic partial oxidation (CPO) step followed by a homogeneous flame combustion with interstage heat removal, was tested for the first time with mixtures of methane and hydrogen. Short contact time CPO experiments were run to elucidate the effect of the progressive substitution of methane with H-2 in the fuel feed to the structured catalytic reactor, which was operated under self-sustained conditions at high tempera...
Mechanism Studies on CVD of Boron Carbide from a Gas Mixture of BCl3, CH4, and H-2 in a Dual Impinging-jet Reactor Karaman, Mustafa; Sezgi, Naime Aslı; Doğu, Timur; Ozbelge, Hilmi Onder (2009-03-01) Nearly pure boron carbide free from impurities was produced on a tungsten substrate in a dual impinging-jet chemical vapor deposition reactor from a BCl3, CH4, and H-2 mixture. The Fourier Tran form Infrared (FTIR) analysis proved the formation Of reaction intermediate BHCl2, which is proposed to occur mainly in the gaseous boundary layer next to the substrate surface. Among a large number of reaction mechanisms proposed only the ones considering the molecular adsorption of boron carbide on the substrate su...

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: https://hdl.handle.net/11511/31066.