Boosting hydrogen production from steam reforming of ethanol on nickel by lanthanum doped ceria

Xiao, Zhourong; Wu, Chan; Wang, Li; Xu, Jisheng; Zheng, Qiancheng; Pan, Lun; Zou, Ji‐Jun; Zhang, Xiangwen; Li, Guozhu

doi:10.1016/j.apcatb.2021.119884

Cited by 77 publications

(28 citation statements)

References 51 publications

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“…14 Accumulated research data have confirmed that the selection of supports and the size of Ni species can affect the coking, sintering and ESR activity of Ni based catalysts. 9,13,15 For instance, Gong's group reported that a MgO substrate could balance the ratio of Ni 0 and Ni 2+ to increase the coke resistance 16 and Greluk synthesized NiO with <5 nm size that had a high ESR H 2 production rate. 17 But, all of those strategies cannot improve the coke resistance, sintering resistance and ESR activity of Ni based catalysts synergistically.…”

Section: Introductionmentioning

confidence: 99%

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Yuan

Peng

et al. 2022

Green Chem.

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Section: Introductionmentioning

confidence: 99%

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Yuan

Peng

et al. 2022

Green Chem.

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“…However, the Al 2 O 3 acid sites also catalyze the ethanol dehydration, eq , yielding ethylene that undergoes decomposition to yield carbon material and H 2 through eq . The use of basic supports or the combination of basic oxides with Al 2 O 3 , such as La 2 O 3 , CeO 2 , ZnO, or ZrO 2 , improves the dispersion, prevents the sintering of the metal particles, and favors some reactions boosting the H 2 yield. − The presence of these oxides improves the oxygen mobility and the H 2 O adsorption and dissociation, resulting in promoting steam reforming reactions, eqs , , , and , the water–gas shift reaction, eq , and coke gasification, eq . The addition of basic promoters, such as CaO, reduces the support acidity and decreases the interaction between the metal precursor and the support, thus enhancing the formation of the metal particles onto the support .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Reaction Routes for H₂ Formation in the Ethanol Steam Reforming on a Catalyst Derived from NiAl₂O₄ Spinel

et al. 2021

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This work describes the satisfactory performance of a Ni/Al 2 O 3 catalyst derived from NiAl 2 O 4 spinel in ethanol steam reforming and focuses on studying the prevailing reaction routes for H 2 formation in this system. NiAl 2 O 4 spinel was synthesized using a coprecipitation method and reduced at 850 °C to obtain a Ni/Al 2 O 3 catalyst. The spinel structure and catalyst were characterized using XRD, TPR, N 2 physisorption, NH 3 adsorption and TPD, TPO, SEM, and TEM. The experiments were carried out in a fluidized-bed reactor at 500 or 600 °C and different space-time values, using pure ethanol, ethanol–water, pure ethylene, or ethylene–water feeds. The reaction takes place through two paired routes activated by each catalyst function (metal and acid sites) whose extent is limited by the selective catalyst deactivation. The results evidence that at the beginning of the reaction the main route for the formation of H 2 and carbon (nanotubes) is the dehydration of ethanol on acid sites followed by decomposition of ethylene on the Ni–Al 2 O 3 interface. This route is favored at 500 °C. After the rapid deactivation of the catalyst for ethylene decomposition, the route of H 2 formation by steam reforming of ethanol and water gas shift reactions over Ni sites is favored. The morphology of the carbon deposits (nanotubes) allows the catalyst to maintain a notable activity for the latter pathways, with stable formation of H 2 (during 48 h in the experiments carried out). At 600 °C, the extent of the gasification reaction of carbon species lowers the carbon material formation. The high formation of carbon material is interesting for the coproduction of H 2 and carbon nanotubes with low CO 2 emissions.

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“…CeO 2 has been extensively utilized in heterogeneous catalysis because of its distinctive redox behavior and the production of oxygen vacancies by the reduction of Ce 4+ to Ce 3+ ions [ 16 , 17 , 18 ]. According to the previous studie, the oxygen vacancies of CeO 2 can dissociate water and generateabundant surface hydroxyl groups in steam reforming of ethanol, thus increasing the catalytic activity [ 19 ]. Furthermore, CeO 2 is not only used as a redox support to disperse metal nanoparticles but is also used to help oxidize the carbon deposition on the catalyst during the reaction, due to its excellent oxygen storage capacity [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…Pant et al revealed that a lower coke formation and higher stability were obtained of Ni/CeO 2 compared to Ni/Al 2 O 3 catalysts in the steam reforming of glycerol for hydrogen production [ 22 ]. For CeO 2 , Ce 4+ can be reduced to Ce 3+ in a hydrogen atmosphere, accompanied by the formation of this oxygen vacancy; and oxygen vacancy has the ability to anchor nickel, which can promote nickel dispersion and inhibit nickel aggregation [ 19 ]. Hence, increasing the oxygen vacancy concentration by a suitable way may be effective in improving the dispersion of nickel nanoparticles in the catalyst and inhibiting the growth of nickel nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Nanoarchitectonics of Ni/CeO2 Catalysts: The Effect of Pretreatment on the Low-Temperature Steam Reforming of Glycerol

Wang

Zhu

et al. 2022

Nanomaterials

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CeO2 nanosphere-supported nickel catalysts were prepared by the wetness impregnation method and employed for hydrogen production from glycerol steam reforming. The dried catalyst precursors were either reduced by H2 after thermal calcination or reduced by H2 directly without calcination. The catalysts that were reduced by H2 without calcination achieved a 95% glycerol conversion at a reaction temperature of only 475 °C, and the catalytic stability was up to 35 h. However, the reaction temperature required of catalysts reduced by H2 with calcination was 500 °C, and the catalysts was rapidly inactivated after 25 h of reaction. A series of physicochemical characterization revealed that direct H2 reduction without calcination enhanced the concentration of oxygen vacancies. Thus, the nickel dispersion was improved, the nickel nanoparticle size was reduced, and the reduction of nickel was increased. Moreover, the high concentration of oxygen vacancy not only contributed to the increase of H2 yield, but also effectively reduced the amount of carbon deposition. The increased active nickel surface area and oxygen vacancies synergistically resulted in the superior catalytic performance for the catalyst that was directly reduced by H2 without calcination. The simple, direct hydrogen reduction method remarkably boosts catalytic performance. This strategy can be extended to other supports with redox properties and applied to heterogeneous catalytic reactions involving resistance to sintering and carbon deposition.

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Boosting hydrogen production from steam reforming of ethanol on nickel by lanthanum doped ceria

Cited by 77 publications

References 51 publications

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Insights into the Reaction Routes for H₂ Formation in the Ethanol Steam Reforming on a Catalyst Derived from NiAl₂O₄ Spinel

Nanoarchitectonics of Ni/CeO2 Catalysts: The Effect of Pretreatment on the Low-Temperature Steam Reforming of Glycerol

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Boosting hydrogen production from steam reforming of ethanol on nickel by lanthanum doped ceria

Cited by 77 publications

References 51 publications

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Insights into the Reaction Routes for H2 Formation in the Ethanol Steam Reforming on a Catalyst Derived from NiAl2O4 Spinel

Nanoarchitectonics of Ni/CeO2 Catalysts: The Effect of Pretreatment on the Low-Temperature Steam Reforming of Glycerol

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Insights into the Reaction Routes for H₂ Formation in the Ethanol Steam Reforming on a Catalyst Derived from NiAl₂O₄ Spinel