Ethanol steam reforming over Ni/La–Al2O3 catalysts: Influence of lanthanum loading

Sánchez-Sánchez, M.C.; Navarro, R.M.; Fierro, J.L.G.

doi:10.1016/j.cattod.2006.10.013

Cited by 176 publications

(100 citation statements)

References 20 publications

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“…This is explained by a high activity of Ni in this reaction provided coking of its surface is hindered by oxidic promoters. Moreover, specific activity of Ni supported on alumina is reported to be even higher than that of low-loaded Ru (Fatsikostas et al, 2002;Haryanto et al, 2005;Sanchez-Sanchez et al, 2007). This agrees with the results of Srinivas et al (Srinivas et al, 2003) demonstrating a high and stable activity in ESR of composites comprised of 40wt.…”

Section: Catalytic Properties Of Dispersed Nanocomposites In Ethanol supporting

confidence: 88%

“…11, 12. For all samples, NiO reduction was completed up to 600-700 o C. For composite I, reduction starts at ~280 o C with T max ~ 350 o C, which is rather close to typical characteristics for samples of pure NiO or its mechanical mixture with YSZ (Montoya et al, 2000;Sanchez-Sanchez et al, 2007) and agrees with the microstructural data revealing little if any interaction between NiO and YSZ in this case. Supporting Ce-Zr-O oxide on this composite shifts T max to ~400 o C, apparently due to a partial blocking of NiO surface (especially surface defects at which nucleation of Ni o occurs) and/or stabilizing Ni 2+ cations thus hampering reduction.…”

Section: H 2 Tprsupporting

confidence: 84%

See 1 more Smart Citation

Nanocomposite Catalysts for Steam Reforming of Methane and Biofuels: Design and Performance

Садыков¹,

Mezentseva²,

Alikina³

et al. 2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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Section: Catalytic Properties Of Dispersed Nanocomposites In Ethanol supporting

confidence: 88%

Section: H 2 Tprsupporting

confidence: 84%

Nanocomposite Catalysts for Steam Reforming of Methane and Biofuels: Design and Performance

Садыков¹,

Mezentseva²,

Alikina³

et al. 2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

View full text Add to dashboard Cite

“…T species are more difficult to reduce than Ni 2+ OC ones [23,27], while the latter coincides with experimental observations from studies dealing with the promotion effects of La on Ni-based catalysts [26]. The H2-TPR profile of P_LaNi/Al (Figure 3) revealed the presence of three reduction bands within two major reduction zones at temperatures across the range of 290-750 °C.…”

Section: +supporting

confidence: 64%

An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

et al. 2016

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LaNi 5 , known for its hydrogen storage capability, was adapted to the form of a metal oxide-supported (γ-Al 2 O 3 ) catalyst and its performance for the Sabatier reaction assessed. The 20 wt % La-Ni/γ-Al 2 O 3 particles were prepared via solution combustion synthesis (SCS) and exhibited good catalytic activity, achieving a CO 2 conversion of 75% with a high CH 4 selectivity (98%) at 1 atm and 300 • C. Characteristics of the La-Ni/γ-Al 2 O 3 catalyst were identified at various stages of the catalytic process (as-prepared, activated, and post-reaction) and in-situ DRIFTS was used to probe the reaction mechanism. The as-prepared catalyst contained amorphous surface La-Ni spinels with particle sizes <6 nm. The reduction process altered the catalyst make-up where, despite the reducing conditions, Ni 2+ -based particles with diameters between 4 and 20 nm decorated with LaO x moieties were produced. However, the post-reaction catalyst had particle sizes of 4-9 nm and comprised metallic Ni, with the LaO x decoration reverting to a form akin to the as-prepared catalyst. DRIFTS analysis indicated that formates and adsorbed CO species were present on the catalyst surface during the reaction, implying the reaction proceeded via a H 2 -assisted and sequential CO 2 dissociation to C and O. These were then rapidly hydrogenated into CH 4 and H 2 O.

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“…www.mdpi.com/journal/catalysts Regarding the type of C, it has been reported that the oxidation of filamentous carbon associated with nickel particles occurs between 300 °C and 527 °C while the oxidation of carbon with different degrees of graphitization takes place above 527 °C [28][29][30]. From Figure 6 and the results compiled in Table 3 it can be seen that in general, very low weight losses were measured.…”

Section: Catalystsmentioning

confidence: 89%

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

et al. 2018

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Abstract:This work studies Ni-based catalyst deactivation and regeneration processes in the presence of H 2 S under a biogas tri-reforming process for hydrogen production, which is an energy vector of great interest. 25 ppm of hydrogen sulfide were continuously added to the system in order to provoke an observable catalyst deactivation, and once fully deactivated two different regeneration processes were studied: a self-regeneration and a regeneration by low temperature oxidation. For that purpose, several Ni-based catalysts and a bimetallic Rh-Ni catalyst supported on alumina modified with CeO 2 and ZrO 2 were used as well as a commercial Katalco 57-5 for comparison purposes. Ni/Ce-Al 2 O 3 and Ni/Ce-Zr-Al 2 O 3 catalysts almost recovered their initial activity. For these catalysts, after the regeneration under oxidative conditions at low temperature, the CO 2 conversions achieved-79.5% and 86.9%, respectively-were significantly higher than the ones obtained before sulfur poisoning-66.7% and 45.2%, respectively. This effect could be attributed to the support modification with CeO 2 and the higher selectivity achieved for the Reverse Water-Gas-Shift (rWGS) reaction after catalysts deactivation. As expected, the bimetallic Rh-Ni/Ce-Al 2 O 3 catalyst showed higher resistance to deactivation and its sulfur poisoning seems to be reversible. In the case of the commercial and Ni/Zr-Al 2 O 3 catalysts, they did not recover their activity.

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Ethanol steam reforming over Ni/La–Al2O3 catalysts: Influence of lanthanum loading

Cited by 176 publications

References 20 publications

Nanocomposite Catalysts for Steam Reforming of Methane and Biofuels: Design and Performance

Nanocomposite Catalysts for Steam Reforming of Methane and Biofuels: Design and Performance

An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

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