Efficient and stable oxidative steam reforming of ethanol for hydrogen production: Effect of in situ dispersion of Ir over Ir/La2O3

Chen, Hongqing; Yu, Hao; Peng, Feng; Wang, Hongjuan; Yang, Jian; Pan, Mei

doi:10.1016/j.jcat.2009.11.010

Cited by 67 publications

(29 citation statements)

References 46 publications

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“…Total carbon content was significantly diminished with La promotion from 55.6% to 36.8%. The reduction of carbonaceous species on promoted catalyst was allegedly induced by the intrinsic attributes of La 2 O 3 promoter, namely, strong basic nature, great oxygen storage capacity, and reversible redox cycle of La 2 O 3 and La 2 O 2 CO 3 intermediate . The basic character of La 2 O 3 could attract CO 2 adsorption to yield lanthanum dioxycarbonate, La 2 O 2 CO 3 (see Equation ), further reacting with adjacent surface carbon (see Equation ), thereby prolonging the lifecycle of 3%La‐10%Co/Al 2 O 3.…”

Section: Resultssupporting

confidence: 87%

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

et al. 2018

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Summary Catalytic stability with time‐on‐stream is an important aspect in ethanol dry reforming (EDR) since catalysts could encounter undesirable deterioration arising from deposited carbon. This work examined the promotional effect of La on 10%Co/Al2O3 in terms of activity, stability, and characteristics. Catalysts were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman, and X‐ray photoelectron spectroscopy (XPS) measurements whilst catalytic EDR performance of La‐promoted and unpromoted 10%Co/Al2O3 prepared via wet impregnation technique was investigated at 973 K for 72 h using a stoichiometric feed ratio (C2H5OH/CO2 = 1/1). La promoter substantially enhanced both metal dispersion and metal surface area from 0.11% to 0.64% and 0.08 to 0.43 m2 g−1, respectively. Ethanol and CO2 conversions appeared to be stable within 50 to 72 h after experiencing an initial activity drop. The conversion of C2H5OH and CO2 for La‐promoted catalyst was about 1.65 and 1.34 times greater than unpromoted counterpart in this order. The carbonaceous deposition was considerably decreased from 55.6% to 36.8% with La promotion due to La2O2CO3 intermediate formation. Additionally, 3%La‐10%Co/Al2O3 possessed greater oxygen vacancies acting as active sites for CO2 adsorption and hence increasing carbon gasification. Even though graphitic and filamentous carbons were formed on used catalyst surface, La‐addition diminished graphite formation and increased the reactiveness of amorphous carbon.

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Section: Resultssupporting

confidence: 87%

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

et al. 2018

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“…Because of its high H 2 yield, steam reforming of ethanol over supported metal has been studied extensively in recent years [6e8]. However, it is a highly endothermic reaction, typically operating within the temperature range of 700e1000 K [9,10]. This highly reforming temperature also favors the reverse water-gas shift (R-WGS) reaction (CO 2 þ H 2 4 CO þ H 2 O) and thus the generation of CO [11], the presence of which degrades the performance of Pt electrodes in fuel cell systems [12].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production from oxidative steam reforming of ethanol over rhodium catalysts supported on Ce–La solid solution

Han

et al. 2013

International Journal of Hydrogen Energy

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, which is 150 K lower than that required for comparable performance with 1%Rh/ CeO 2 . La doping also enhanced the stability by accelerating CH 3 COCH 3 conversion and gave low CO selectivity due to the high water gas shift activity. X-ray diffraction and Raman spectroscopy characterizations indicate the formation of CeeLa solid solutions and oxygen vacancies. H 2 temperature-programmed reduction and thermo-gravimetric measurement results confirmed that the redox properties of Rh/CeO 2 were greatly enhanced by La doping, which accelerated ethanol conversion, promoted H 2 yield, and maintained good longeterm activity for the OSR reaction.

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“…In fact, the impressive activity of La 2 O 3 for methane coupling has been found earlier to be linked with La 2 O 2 CO 3 [7,8]. During the catalytic process, La 2 O 3 was found to transform into hexagonal La 2 O 2 CO 3 , which would suppress coking effectively, prevent the catalyst from sintering, and finally afford high dispersion of catalysts at elevated temperatures [2,9,10].…”

Section: Introductionmentioning

confidence: 83%

“…Much effort has been made for the studies of La 2 O 3 which is very attractive for its applications in the fields of phosphors [1], catalysts [2] and catalyst supports [3,4]. The lanthanum oxycarbonate (La 2 O 2 CO 3 ), however, receives much less attention.…”

Section: Introductionmentioning

confidence: 99%

One-pot facile synthesis and optical properties of porous La2O2CO3 hollow microspheres

Niu

Qiu

Tao

et al. 2011

Journal of Alloys and Compounds

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Efficient and stable oxidative steam reforming of ethanol for hydrogen production: Effect of in situ dispersion of Ir over Ir/La2O3

Cited by 67 publications

References 46 publications

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

Hydrogen production from oxidative steam reforming of ethanol over rhodium catalysts supported on Ce–La solid solution

One-pot facile synthesis and optical properties of porous La2O2CO3 hollow microspheres

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