Interactions between Ni and La{sub 2}O{sub 3} in Ni/La{sub 2}O{sub 3} catalysts prepared using different Ni precursors

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1996.0161· OSTI ID:471604

Ruckenstein, E; Hu, Y H ^[1]

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1. State Univ. of New York, Amherst, NY (United States)

The role of the anion (NO{sub 3}{sup {minus}} or Cl{sup {minus}}), used in the preparation via impregnation of unreduced Ni/La{sub 2}O{sub 3} catalysts, in the interactions between Ni and La{sub 2}O{sub 3} was investigated using XRD, TPR, and ESCA experiments. The following results have been obtained: In the 20 wt% Ni/La{sub 2}O{sub 3} prepared using Ni(NO{sub 3}){sub 2} as precursor, LaNiO{sub 3} and La(OH){sub 3} were the only compounds identified by XRD in the sample calcined in O{sub 2} and La{sub 2}NiO{sub 4} and La(OH){sub 3} were the only compounds identified in the sample calcined in He. At lower Ni contents, the La{sub 2}O{sub 3} phase was additionally identified. For the 20 wt% Ni/La{sub 2}O{sub 3} prepared using Ni chloride as precursor, LaOCl was the only compound detected by XRD; no phase containing Ni was identified by XRD in the samples calcined in O{sub 2} or He. At lower Ni chloride contents, LaNiO{sub 3} was additionally detected in the sample calcined in O{sub 2} and La{sub 2}NiO{sub 4} in that calcined in He. A comparison between the XRD spectra and the TPR curves suggested the presence of amorphous NiO in the samples based on Ni chloride. It is also shown that the Ni precursor employed in the preparation of the catalyst plays a role in the CO{sub 2} reforming of CH{sub 4}. During the CO{sub 2} reforming of methane, the unreduced Ni/La{sub 2}O{sub 3} catalysts, based on Ni nitrate, had a high initial CO yield but a low time stability; in contrast, the unreduced Ni/La{sub 2}O{sub 3} catalysts, based on chloride, had a high stability. A possible explanation of this behavior, based on ESCA analysis and on the reaction between CH{sub 4} and catalysts, is provided.

• OSTI ID: 471604
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 161; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
10 SYNTHETIC FUELS
40 CHEMISTRY
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
ELECTRON SPECTROSCOPY
HETEROGENEOUS CATALYSIS
LANTHANUM OXIDES
METHANE
NICKEL
REDUCTION
STRUCTURAL CHEMICAL ANALYSIS
X-RAY DIFFRACTION