Nickel molybdate as precursor of HDS catalysts: Effect of phase composition

Joaquín L. Brito; A. Liliana Barbosa; Alberto Albornoz; Francisco Severino; Jorge Laine

doi:10.1007/BF00810606

Nickel molybdate as precursor of HDS catalysts: Effect of phase composition

Joaquín L. Brito
, A. Liliana Barbosa
, Alberto Albornoz
, Francisco Severino
, Jorge Laine

Instituto Venezolano de Investigaciones Científicas

Research output: Contribution to journal › Article › peer-review

71 Scopus citations

Abstract

Sulfided αand β-NiMoO₄ have been employed as model HDS catalysts, aiming to investigate the effect of phase composition of the precursor mixed oxide on the physicochemical characteristics and activity of the sulfides. Both sulfides are highly amorphous or microcrystalline, and could not be differentiated by means of XRD. The differences in BET area were also found to be minimal. However, it was found by means of TPR that the stable α-isomorph is reduced at lower temperatures than the unstable β-phase in both the oxidic and sulfided states. Sulfided β-NiMoO₄ was found to be a better catalyst for the HDS of thiophene than the sulfided α-isomorph. This could be related to the higher stability of the former in H₂, as decomposition of the active, amorphous Ni-Mo-S structures results in less active and more crystalline phases, as found by XRD.

Original language	English
Pages (from-to)	329-337
Number of pages	9
Journal	Catalysis Letters
Volume	26
Issue number	3-4
DOIs	https://doi.org/10.1007/BF00810606
State	Published - Sep 1994
Externally published	Yes

Keywords

catalyst characterization (TPR)
HDS catalysts
nickel molybdate

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10.1007/BF00810606

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@article{450baf48c050458795ebb71cb238803d,

title = "Nickel molybdate as precursor of HDS catalysts: Effect of phase composition",

abstract = "Sulfided αand β-NiMoO4 have been employed as model HDS catalysts, aiming to investigate the effect of phase composition of the precursor mixed oxide on the physicochemical characteristics and activity of the sulfides. Both sulfides are highly amorphous or microcrystalline, and could not be differentiated by means of XRD. The differences in BET area were also found to be minimal. However, it was found by means of TPR that the stable α-isomorph is reduced at lower temperatures than the unstable β-phase in both the oxidic and sulfided states. Sulfided β-NiMoO4 was found to be a better catalyst for the HDS of thiophene than the sulfided α-isomorph. This could be related to the higher stability of the former in H2, as decomposition of the active, amorphous Ni-Mo-S structures results in less active and more crystalline phases, as found by XRD.",

keywords = "catalyst characterization (TPR), HDS catalysts, nickel molybdate",

author = "Brito, \{Joaqu{\'i}n L.\} and Barbosa, \{A. Liliana\} and Alberto Albornoz and Francisco Severino and Jorge Laine",

year = "1994",

month = sep,

doi = "10.1007/BF00810606",

language = "Ingl{\'e}s",

volume = "26",

pages = "329--337",

journal = "Catalysis Letters",

issn = "1011-372X",

publisher = "Kluwer Academic Publishers",

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}

TY - JOUR

T1 - Nickel molybdate as precursor of HDS catalysts

T2 - Effect of phase composition

AU - Brito, Joaquín L.

AU - Barbosa, A. Liliana

AU - Albornoz, Alberto

AU - Severino, Francisco

AU - Laine, Jorge

PY - 1994/9

Y1 - 1994/9

N2 - Sulfided αand β-NiMoO4 have been employed as model HDS catalysts, aiming to investigate the effect of phase composition of the precursor mixed oxide on the physicochemical characteristics and activity of the sulfides. Both sulfides are highly amorphous or microcrystalline, and could not be differentiated by means of XRD. The differences in BET area were also found to be minimal. However, it was found by means of TPR that the stable α-isomorph is reduced at lower temperatures than the unstable β-phase in both the oxidic and sulfided states. Sulfided β-NiMoO4 was found to be a better catalyst for the HDS of thiophene than the sulfided α-isomorph. This could be related to the higher stability of the former in H2, as decomposition of the active, amorphous Ni-Mo-S structures results in less active and more crystalline phases, as found by XRD.

AB - Sulfided αand β-NiMoO4 have been employed as model HDS catalysts, aiming to investigate the effect of phase composition of the precursor mixed oxide on the physicochemical characteristics and activity of the sulfides. Both sulfides are highly amorphous or microcrystalline, and could not be differentiated by means of XRD. The differences in BET area were also found to be minimal. However, it was found by means of TPR that the stable α-isomorph is reduced at lower temperatures than the unstable β-phase in both the oxidic and sulfided states. Sulfided β-NiMoO4 was found to be a better catalyst for the HDS of thiophene than the sulfided α-isomorph. This could be related to the higher stability of the former in H2, as decomposition of the active, amorphous Ni-Mo-S structures results in less active and more crystalline phases, as found by XRD.

KW - catalyst characterization (TPR)

KW - HDS catalysts

KW - nickel molybdate

UR - https://www.scopus.com/pages/publications/0000957695

U2 - 10.1007/BF00810606

DO - 10.1007/BF00810606

M3 - Artículo

AN - SCOPUS:0000957695

SN - 1011-372X

VL - 26

SP - 329

EP - 337

JO - Catalysis Letters

JF - Catalysis Letters

IS - 3-4

ER -

Nickel molybdate as precursor of HDS catalysts: Effect of phase composition

Abstract

Keywords

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