CH4 reforming with CO2 for syngas production over La2O3 promoted Ni catalysts supported on mesoporous nanostructured γ-Al2O3

Habibi, Narges; Rezaei, Mehran; Majidian, Nasrollah; Andache, Mahmood

doi:10.1016/s2095-4956(14)60169-8

Cited by 36 publications

(7 citation statements)

References 13 publications

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“…La 2 O 3 addition was also found to improve catalytic activity, stability and resistance to coking of a number of alumina supported metal catalysts such as Ni/Al 2 O 3 catalysts for the steam reforming of ethanol 9,10 , steam reforming of biomass tars 10 , dry reforming of methane 11 and steam gasification of biomass 12 .…”

Section: Introductionmentioning

confidence: 98%

Acido-basicity of lanthana/alumina catalysts and their activity in ethanol conversion

Garbarino

Wang

Valsamakis

et al. 2017

Applied Catalysis B: Environmental

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Lanthana on alumina samples (0.2, 0.8 and 4.7 theoretical monolayers) were prepared by incipient wetness impregnation using γ-Al2O3 as support. Characterization has been performed by BET, XRD, skeletal FT-IR, DR-UVvis, XPS, HR-TEM, IR spectra of the surface OH, adsorbed pyridine and CO2, and isopropanol TPD. Ethanol conversion was investigated both in temperature-programmed surface reaction (TPSR) dynamic conditions as well as in steady-state flow reactor tests. Lanthanum addition stabilizes alumina with respect to sintering and loss of surface area and La- containing phases are observed only for the high-La loaded catalyst. La-alumina catalysts are less active in ethanol dehydration than alumina but more selective to diethyl ether at partial conversion. 5%La2O3/Al2O3 is also equally or more selective than alumina to ethylene at high conversion, producing less carbonaceous material during reaction. Thus, this catalytic system might be a good candidate for (bio)ethylene production through (bio)ethanol dehydration

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Section: Introductionmentioning

confidence: 98%

Acido-basicity of lanthana/alumina catalysts and their activity in ethanol conversion

Garbarino

Wang

Valsamakis

et al. 2017

Applied Catalysis B: Environmental

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“…They proposed (later observed directly) the formation of NiAl 2 O 4 upon heat treating the Al 2 O 3 -overcoated Ni/Al 2 O 3 catalyst and that the Ni 2+ of this NiAl 2 O 4 undergoes very slow reduction to metallic Ni (the active site for DRM), which then subsequently sinters during DRM reaction. Note that other researchers reported the suppression of NiAl 2 O 4 formation when La 2 O 3 is incorporated into an Al 2 O 3 support via a wet impregnation method. − Furthermore, the addition of La 2 O 3 in catalyst supports has been reported to inhibit carbon deposit formation by providing Lewis basic sites, which activate CO 2 by disproportionation to CO and O surface species, thereby removing carbon deposits. − Motivated by these concepts, in this study we apply ALD to deposit a La 2 O 3 layer on the surface of Ni/Al 2 O 3 catalyst, in contrast to using traditional co-precipitation or wet impregnation methods. The goal of precisely depositing La 2 O 3 on the catalyst surface rather than in the bulk phase is to increase its interaction with the ALD-overcoated Al 2 O 3 and to determine if this suppresses the formation of catalytically inactive NiAl 2 O 4 species.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing Supported Ni Catalysts for Dry Reforming of Methane by Combined La Doping and Al Overcoating Using Atomic Layer Deposition

et al. 2022

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Deposition of La 2 O 3 and Al 2 O 3 on Al 2 O 3 -supported Ni catalysts was performed to study their effects on heterogeneous catalysts for the dry reforming of methane (DRM) reaction. An alumina-supported Ni catalyst (Ni/Al 2 O 3 , 2 wt % of Ni), synthesized via incipient wetness impregnation, loses ∼87% of its initial activity within 45 h under DRM conditions. While overcoating of Al 2 O 3 on this catalyst via atomic layer deposition (ALD) helps stabilize the catalytic activity in long time-on-stream (TOS) tests, this overcoated catalyst is ca. 40 times less active than the uncoated catalyst at peak activity. This Al 2 O 3 -overcoated Ni/Al 2 O 3 catalyst also exhibits a long induction period (∼20 h) due to the slow reduction of Ni 2+ within the catalytically inactive nickel aluminate (NiAl 2 O 4 ) phase, formed by the interaction of metallic Ni with the Al 2 O 3 overcoat during pre-DRM treatment at the 700 °C reaction temperature. Here, we report that, while doping small amounts of La (∼0.03 wt %) into the Ni/Al 2 O 3 catalyst does not significantly affect the catalytic activity or stability by itself, the addition of ALD-Al 2 O 3 on top of the La 2 O 3 -promoted Ni catalysts significantly suppresses the long TOS deactivation, helps recover the peak activity of uncoated Ni/ Al 2 O 3 , and eliminates the DRM induction period. This strategy obtains the stabilization benefits of Al 2 O 3 overcoating on Ni/Al 2 O 3 while, at the same time, avoiding the formation of undesirable NiAl 2 O 4 species.

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“…6 a. It is apparent from the thermograms that all Co‐based catalysts presented one main characteristic peak at around 400–700 °C, which is commonly associated with oxidation of whisker type of carbon 49.…”

Section: Resultsmentioning

confidence: 94%

Production of Synthesis Gas via Dry Reforming of Methane over Co‐Based Catalysts: Effect on H₂/CO Ratio and Carbon Deposition

et al. 2015

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The effect of support type on synthesis gas production using Co-based catalysts supported over TiO 2 -P25, Al 2 O 3 , SiO 2 , and CeO 2 was investigated. The catalysts were prepared by the incipient wet impregnation method and characterized by various techniques for comparison. Experiments were performed in a micro tubular reactor. The results revealed that all Co-supported catalysts produced synthesis gas ratios of 1 and below and, thus, proved to be well-suited for methanol and Fischer-Tropsch syntheses. Co catalysts supported over TiO 2 -P25 and Al 2 O 3 provided better synthesis gas ratios and stability performances. The promotion of a Co/TiO 2 -P25 catalyst with Ce had a substantial influence on its catalytic activity and the amount of carbon deposit. A Ce-promoted catalyst diminished markedly the extent of carbon deposition and thus boosted the performance towards better activity and stability.

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CH4 reforming with CO2 for syngas production over La2O3 promoted Ni catalysts supported on mesoporous nanostructured γ-Al2O3

Cited by 36 publications

References 13 publications

Acido-basicity of lanthana/alumina catalysts and their activity in ethanol conversion

Acido-basicity of lanthana/alumina catalysts and their activity in ethanol conversion

Stabilizing Supported Ni Catalysts for Dry Reforming of Methane by Combined La Doping and Al Overcoating Using Atomic Layer Deposition

Production of Synthesis Gas via Dry Reforming of Methane over Co‐Based Catalysts: Effect on H₂/CO Ratio and Carbon Deposition

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CH4 reforming with CO2 for syngas production over La2O3 promoted Ni catalysts supported on mesoporous nanostructured γ-Al2O3

Cited by 36 publications

References 13 publications

Acido-basicity of lanthana/alumina catalysts and their activity in ethanol conversion

Acido-basicity of lanthana/alumina catalysts and their activity in ethanol conversion

Stabilizing Supported Ni Catalysts for Dry Reforming of Methane by Combined La Doping and Al Overcoating Using Atomic Layer Deposition

Production of Synthesis Gas via Dry Reforming of Methane over Co‐Based Catalysts: Effect on H2/CO Ratio and Carbon Deposition

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Production of Synthesis Gas via Dry Reforming of Methane over Co‐Based Catalysts: Effect on H₂/CO Ratio and Carbon Deposition