Steam reforming and oxidative steam reforming of ethanol over La0.6Sr0.4CoO3− perovskite as catalyst precursor for hydrogen production

Morales, M.; Segarra, M.

doi:10.1016/j.apcata.2015.05.036

Cited by 50 publications

(27 citation statements)

References 43 publications

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“…At similar operative conditions (which means a similar ratio between feed and catalytic mass), other authors found a faster deposition of coke [28,64], even if stability tests were performed for lower TOS [65]: these results demonstrated the competitiveness of the Pt-Ni/CeO 2 -SiO 2 catalyst in terms of endurance performances. In order to evaluate catalyst stability under more stressful conditions, space velocity was increased from 4.1 to 123 h −1 and the effect of contact time on ethanol conversion was investigated.…”

Section: Catalytic Performances Of Ceo2-sio2 Based Samplesmentioning

confidence: 48%

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

et al. 2017

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Abstract:In this research, a bimetallic Pt-Ni/CeO 2 -SiO 2 catalyst, synthetized via wet impregnation, was successfully employed for the oxidative steam reforming of ethanol between 300 and 600 • C. The reaction performance of the Pt-Ni catalyst was investigated and compared with the Ni/CeO 2 -SiO 2 , Pt/CeO 2 -SiO 2 as well as CeO 2 -SiO 2 sample. The bimetallic catalyst displayed the best results in terms of hydrogen yield and by-products selectivity, thus highlighting the crucial role of active species (Pt and Ni) in promoting ethanol conversion and reaching the products distribution predicted by thermodynamics. The most promising sample, tested at 500 • C for more than 120 h, assured total conversion and no apparent deactivation, demonstrating the stability of the selected formulation. By changing contact time, the dependence of carbon formation rate on space velocity was also investigated.

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Section: Catalytic Performances Of Ceo2-sio2 Based Samplesmentioning

confidence: 48%

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

et al. 2017

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“…The existence of the characteristic diffraction peak of LaGaO3 and La2O3 indicated that the adding of K weakened the interaction between lanthanum and gallium. In other , part of La 2 O 3 transferred to LaCO 3 OH and La 2 O 2 CO 3 , for that La 2 O 3 and CO 2 can react to generate La 2 O 2 CO 3 , and the further reaction between La 2 O 2 CO 3 , H 2 O and CO 2 can generate LaCO 3 OH [19,20]. Since XRPD in this work was carried out ex situ, the catalysts containing La 2 O 2 CO 3 could readily absorb H 2 O and CO 2 in air, and then LaCO 3 OH formed.…”

Section: X-ray Powder Diffraction (Xrpd)mentioning

confidence: 99%

“…Herein, the formula of CO 2 + La 2 O 3 → La 2 O 2 CO 3 C → 2CO + La 2 O 3 is used to illustrate the process of removing carbon deposits during the reaction, indicating that more La 2 O 3 favors the anti-carbon effect of catalysts [19,[40][41][42]. In addition, seen from the used XRPD pattern for LKCG-x catalysts, both La 2 O 3 and La 2 O 2 CO 3 can also be detected, explaining that the above mechanism is correct.…”

Section: Thermo-gravimetry (Tg)mentioning

confidence: 99%

K-Modulated Co Nanoparticles Trapped in La-Ga-O as Superior Catalysts for Higher Alcohols Synthesis from Syngas

et al. 2019

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Owing to the outstanding catalytic performance for higher alcohol synthesis, Ga-Co catalysts have attracted much attention. In view of their unsatisfactory stability and alcohol selectivity, herein, K-modulated Co nanoparticles trapped in La-Ga-O catalysts were prepared by the reduction of La1−xKxCo0.65Ga0.35O3 perovskite precursor. Benefiting from the atomic dispersion of all the elements in the precursor, during the reduction of La1−xKxCo0.65Ga0.35O3, Co nanoparticles could be confined into the K-modified La-Ga-O composite oxides, and the confinement of La-Ga-O could improve the anti-sintering performance of Co nanoparticles. In addition, the addition of K modulated parts of La-Ga-O into La2O3, which ameliorated the anti-carbon deposition performance. Finally, the addition of K increased the dispersion of cobalt and provided more electron donors to metallic Co, resulting in a high activity and superior selectivity to higher alcohols. Benefiting from the above characteristics, the catalyst possesses excellent activity, good selectivity, and superior stability.

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“…Kawi et al [14] discovered that the Ni 3+ in LaNiO 3 could be readily reduced to Ni and distributed on La 2 O 3 support. Morales et al [15] studied the La 0.6 Sr 0.4 CoO 3−d perovskite for ethanol steam reforming and have observed the movement of metallic cobalt from perovskite lattice to the surface of OCs. Wu et al [16] developed a series of La 1-x Ca x NiO 3 catalysts for hydrogen production by glycerol steam reforming.…”

Section: Fuel Feedmentioning

confidence: 99%

Hydrogen Production from Chemical Looping Steam Reforming of Ethanol over Perovskite-Type Oxygen Carriers with Bimetallic Co and Ni B-Site Substitution

Sun

Zhang

et al. 2018

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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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Steam reforming and oxidative steam reforming of ethanol over La0.6Sr0.4CoO3− perovskite as catalyst precursor for hydrogen production

Cited by 50 publications

References 43 publications

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

K-Modulated Co Nanoparticles Trapped in La-Ga-O as Superior Catalysts for Higher Alcohols Synthesis from Syngas

Hydrogen Production from Chemical Looping Steam Reforming of Ethanol over Perovskite-Type Oxygen Carriers with Bimetallic Co and Ni B-Site Substitution

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