An electron spectroscopy and x-ray diffraction study of nickel oxide/alumina and nickel-oxide-tungsten trioxide/alumina catalysts

Scheffer, B.; Heijeinga, J. J.; Moulijn, J. A.

doi:10.1021/j100302a023

Cited by 149 publications

(78 citation statements)

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“…Those spectra show intense signals in the UV region of 250-350 nm, which relate to the O 2− → Ni 2+ charge transfer (CT) in the octahedral NiO lattice [42]. NiO shows strong absorption over the whole mentioned range which can be assigned to nonstoichiometric NiO containing some Ni 3+ domains [42]. Mg.Al supported samples show shoulders in the range of 250-350 nm which cannot be found in the spectra of Ni/MgO and Ni/Al.550, suggesting weaker interaction of Ni species with the Mg.Al supports [30].…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

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Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Armbruster

Atia

et al. 2017

Catalysts

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Methane dry reforming (DRM) was investigated over highly active Ni catalysts with low metal content (2.5 wt %) supported on Mg-Al mixed oxide. The aim was to minimize carbon deposition and metal sites agglomeration on the working catalyst which are known to cause catalyst deactivation. The solids were characterized using N 2 adsorption, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The results showed that MgO-Al 2 O 3 solid solution phases are obtained when calcining Mg-Al hydrotalcite precursor in the temperature range of 550-800 • C. Such phases contribute to the high activity of catalysts with low Ni content even at low temperature (500 • C). Modifying the catalyst preparation with citric acid significantly slows the coking rate and reduces the size of large octahedrally coordinated NiO-like domains, which may easily agglomerate on the surface during DRM. The most effective Ni catalyst shows a stable DRM course over 60 h at high weight hourly space velocity with very low coke deposition. This is a promising result for considering such catalyst systems for further development of an industrial DRM technology.

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Section: Characterization Of the Catalystsmentioning

confidence: 99%

“…Those spectra show intense signals in the UV region of 250-350 nm, which relate to the O 2−  Ni 2+ charge transfer (CT) in the octahedral NiO lattice [42]. NiO shows strong absorption over the whole mentioned range which can be assigned to nonstoichiometric NiO containing some Ni 3+ domains [42]. Figure 5).…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Armbruster

Atia

et al. 2017

Catalysts

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“…In contrast, nickel in P_LaNi/Al was presumed to have formed Ni-Al surface spinels since the occurrence of such species in Ni/Al systems is widely known [19][20][21][22][23][24]. According to Li et al the absence of XRD lines corresponding to these surface spinels results from their short-range three-dimensional order, provided that Ni ions only diffused into the first few outer layers of the Al 2 O 3 support during their 450 • C calcination stage [22].…”

Section: As-prepared Catalyst (P_lani/al)mentioning

confidence: 99%

“…While more commonly associated with H 2 storage applications, bulk LaNi 5 has exhibited promising activity/selectivity for the Sabatier reaction [17][18][19]. For instance Ando et al achieved CO 2 conversions of 92% and methane selectivity of 98% (achieved after a 5 h induction period) for bulk LaNi 5 (prepared by arc-melting) at 250 • C with a high reactants pressure of 5 MPa [18].…”

Section: Introductionmentioning

confidence: 99%

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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“…XRD pattern of Ni/Al2O3 catalyst shows that the main diffraction peaks due to Al2O3 are shifted to lower angles, possibly due to the formation of NiAl2O4 with spinel structure. 29 It is clear that nickel particles are highly dispersed on the supports.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Nickel Based Catalysts for Selective Hydrogenation of Cinnamaldehyde- Influence of Support Phases

Prakash¹,

Mahalakshmy²,

Krishnamurthy³

et al. 2017

ECB

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of supports; polymorphs of titania; nickel at interface Ni (15% w/w) supported on alumina, silica, and titania (P-25, anatase and rutile phases) have been investigated for the liquid phase hydrogenation of cinnamaldehyde. XRD, TPR and XPS data (binding energy shifts for Ni2p) indicate metal-support interactions in all supported catalysts. Weaker binding of H2 on Ni/TiO2 (H2-TPD) improves activity. Ni/TiO2 phases display higher cinnamaldehyde conversion and selectivity to cinnamyl alcohol compared to the catalysts supported on alumina and silica. Amongst the three polymorphs of titania, the maximum activity, and selectivity displayed by Ni/ TiO2-P-25, is attributed to the active Ni crystallites located at the interface between anatase and rutile phases in titania P-25 matrix (HRTEM). Though Ni crystallites on alumina and silica are relatively smaller (compared to those on the three TiO2 phases) in size, their activity vis-à-vis for those supported on titania phases is less, implying that factors other than crystallite size influence the performance.

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An electron spectroscopy and x-ray diffraction study of nickel oxide/alumina and nickel-oxide-tungsten trioxide/alumina catalysts

Cited by 149 publications

References 0 publications

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

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

Nickel Based Catalysts for Selective Hydrogenation of Cinnamaldehyde- Influence of Support Phases

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