scholarly journals Comparison of Packed-Bed and Micro-Channel Reactors for Hydrogen Production via Thermochemical Cycles of Water Splitting in the Presence of Ceria-Based Catalysts

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 767 ◽  
Author(s):  
Ngoenthong ◽  
Hartley ◽  
Sornchamni ◽  
Siri-nguan ◽  
Laosiripojana ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Packed Bed ◽  
Fluorite Structure ◽  
Packed Bed Reactor ◽  
Temperature Program Reduction ◽  
Micro Channel ◽  
Reduction Temperature ◽  
Channel Reactor ◽  
Thermochemical Cycles ◽  
Program Reduction

Hydrogen production via two-step thermochemical cycles over fluorite-structure ceria (CeO2) and ceria-zirconia (Ce0.75Zr0.25O2) materials was studied in packed-bed and micro-channel reactors for comparison purposes. The H2-temperature program reduction (H2-TPR) results indicated that the addition of Zr4+ enhanced the material’s reducibility from 585 µmol/g to 1700 µmol/g, although the reduction temperature increased from 545 to 680 °C. Ce0.75Zr0.25O2 was found to offer higher hydrogen productivity than CeO2 regardless of the type of reactor. The micro-channel reactor showed better performance than the packed-bed reactor for this reaction.

Simulation of hydrogen production through chemical looping reforming process in a packed-bed reactor

2016 ◽  
Vol 105 ◽  
pp. 137-151 ◽  
Author(s):  
Giuseppe Diglio ◽  
Piero Bareschino ◽  
Erasmo Mancusi ◽  
Francesco Pepe
Keyword(s):  
Hydrogen Production ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Chemical Looping

Hydrogen production in an upflow anaerobic packed bed reactor used to treat cheese whey

2013 ◽  
Vol 38 (1) ◽  
pp. 54-62 ◽  
Author(s):  
V. Perna ◽  
E. Castelló ◽  
J. Wenzel ◽  
C. Zampol ◽  
D.M. Fontes Lima ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Cheese Whey ◽  
Packed Bed ◽  
Packed Bed Reactor

Hydrogen production by steam reforming of methanol in a micro-channel reactor coated with Cu/ZnO/ZrO2/Al2O3 catalyst

2006 ◽  
Vol 159 (2) ◽  
pp. 1296-1299 ◽  
Author(s):  
Heondo Jeong ◽  
Kweon Ill Kim ◽  
Tae Hwan Kim ◽  
Chang Hyun Ko ◽  
Hwa Choon Park ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Micro Channel ◽  
Channel Reactor ◽  
Steam Reforming Of Methanol ◽  
Al2o3 Catalyst

Effect of Calcination Heating Rate on Microstructure and Performances of NSR Catalyst

2017 ◽  
Vol 893 ◽  
pp. 81-85
Author(s):  
Jing Li ◽  
Xiang Zhao Zhang ◽  
Pan Wang ◽  
Gui Wu Liu ◽  
Hai Cheng Shao ◽  
...  
Keyword(s):  
Heating Rate ◽  
Raw Materials ◽  
Energy Dispersive Spectrometer ◽  
Sol Gel ◽  
Temperature Program Reduction ◽  
Reduction Temperature ◽  
Sol Gel Process ◽  
And Performance ◽  
Microstructure And Performance ◽  
Program Reduction

The Be/Ce/γ-Al2O3 compound catalysts were prepared by sol-gel process using γ-Al2O3, Ba (AC)2 and Ce (NO3)3·6H2O as raw materials, and the effect of calcination heating rate on microstructure and performance of the NOx storage and reduction (NSR) catalyst was investigated. The crystal structure, microstructure, absorption and reduction performances of the NSR catalyst were characterized and analyzed by X-Ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Brunauer Emmett Teller (BET) and H2 temperature program reduction (H2-TPR). The experimental results show that the Ba and Ce elements mainly exist in the forms of BaCO3 and CeO2, respectively, and partial CeO2 is amorphous. The calcination heating rate can play a key role in the grain size and distribution of BaCO3 and CeO2, so that it can affect the surface area, pore volume and pore diameter of the NSR catalyst. Moreover, the reduction temperature of the NSR catalyst decrease first and then increase with the increase of calcination heating rate, and the reduction temperature of as-received NSR catalyst is the lowest as the reduction temperature is 6 °C/min, that is its reduction performance is the optimal.

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