Renewable hydrogen production from chemical looping steam reforming of ethanol using xCeNi/SBA-15 oxygen carriers in a fixed-bed reactor

This paper describes the synthesis of a series of La1.4Sr0.6Ni1−xCoxO4 perovskite OCs using co-precipitation method by employing Co and Ni as the B-site components of perovskite and the synergetic effect of Co doping on chemical looping reforming of ethanol. A variety of techniques including N2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM) and H2 temperature-programmed reduction (TPR) were employed to investigate the physicochemical properties of the fresh and used OCs. The activity and stability in chemical looping reforming were studied in a fixed bed reactor at 600 °C and a S/C ratio of three. The synergetic effect between Ni and Co was able to enhance the catalytic activity and improve the stability of perovskite OCs. La1.4Sr0.6Ni0.6Co0.4O4 showed an average ethanol conversion of 92.4% and an average CO2/CO ratio of 5.4 in a 30-cycle stability test. Significantly, the H2 yield and purity reached 11 wt.% and 73%, respectively. The Co doping was able to significantly improve the self-regeneration capability due to the increase in the number of oxygen vacancies in the perovskite lattice, thereby enhancing the sintering resistance. Moreover, Co promotion also contributes to the improved WGS activity.

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Hydrogen production from chemical looping steam reforming of glycerol by Ni-based oxygen carrier in a fixed-bed reactor

Chemical Engineering Journal ◽

10.1016/j.cej.2015.05.120 ◽

2015 ◽

Vol 280 ◽

pp. 459-467 ◽

Cited By ~ 65

Author(s):

Bo Jiang ◽

Binlin Dou ◽

Yongchen Song ◽

Chuan Zhang ◽

Baoguo Du ◽

...

Keyword(s):

Hydrogen Production ◽

Steam Reforming ◽

Oxygen Carrier ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Chemical Looping

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Ca-Modiﬁed Co/SBA-15 Catalysts for Hydrogen Production through Ethanol Steam Reforming

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.24.1 ◽

2013 ◽

Vol 24 ◽

pp. 1-16 ◽

Cited By ~ 1

Author(s):

Chen-Bin Wang ◽

Siao Wun Liu ◽

Kuan Fu Ho ◽

Hsin Hua Huang ◽

Chih Wei Tang ◽

...

Keyword(s):

Hydrogen Production ◽

Steam Reforming ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Coke Deposition ◽

Incipient Wetness Impregnation ◽

Hydrogen Yield ◽

Impregnation Method ◽

Steam Reforming Of Ethanol ◽

Incipient Wetness

Hydrogen production through steam reforming of ethanol (SRE) over the Ca-modified Co/SBA-15 catalysts was studied herein to evaluate the catalytic activity, stability and the behavior of coke deposition. The Ca-modified SBA-15 supports were prepared from the Ca(NO3)2·4H2O (10 wt%) which was incorporated to SBA-15 by incipient wetness impregnation (assigned as Ca/SBA-15) and direct hydrothermal (assigned as Ca-SBA-15) method. The active cobalt species from the Co(NO3)2·6H2O (10 wt%) was loaded to SiO2, SBA-15 and modified-SBA-15 supports with incipient wetness impregnation method to obtain the cobalt catalysts (named as Co/SiO2, Co/SBA-15, Co-Ca/SBA-15 and Co/Ca-SBA-15, respectively). The prepared catalysts were characterized by using X-ray diffraction (XRD), temperature programmed reduction (TPR), transmission electron microscopy (TEM) and BET. The catalytic performance of the SRE reaction was evaluated in a fixed-bed reactor. The results indicated that the Co/Ca-SBA-15 catalyst was preferential among these catalysts and the ethanol can be converted completely at 375 °C. The hydrogen yield (YH2) approached 4.76 at 500 °C and less coke deposited. Further, the long-term stability test of this catalyst approached 100 h at 500 °C and did not deactivate.

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