Hydrodesulfurization of 4,6-dimethyldibenzothiophene over high surface area metal phosphides
High surface area MoP (139 m 2/g), Ni 2P (216 m 2/g) and a series of Ni x MoP (121–16 m 2/g) catalysts were synthesized by adding citric acid (CA) to precursor salt solutions prior to drying, calcination and reduction. Their HDS TOFs decreased in the order Ni 2P > Ni x MoP > MoP and for the Ni...
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Veröffentlicht in: | Applied catalysis. A, General General, 2009-06, Vol.361 (1), p.18-25 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | High surface area MoP (139
m
2/g), Ni
2P (216
m
2/g) and a series of Ni
x
MoP (121–16
m
2/g) catalysts were synthesized by adding citric acid (CA) to precursor salt solutions prior to drying, calcination and reduction. Their HDS TOFs decreased in the order Ni
2P
>
Ni
x
MoP
>
MoP and for the Ni
x
MoP catalysts, the observed TOF increased with Ni content.
Unsupported monometallic phosphides (MoP and Ni
2P), as well as a series of bimetallic nickel molybdenum phosphides (Ni
x
MoP), were synthesized with high surface area by adding citric acid (CA) to precursor metal salt solutions prior to drying, calcination and temperature-programmed reduction (TPR). The resulting MoP and Ni
2P catalysts had surface areas of 139 and 216
m
2/g, respectively. The surface areas of the Ni
x
MoP catalysts decreased with increased Ni content and ranged from 121 to 16
m
2/g. In all cases, the catalyst surface area was greater than that obtained when a conventional preparation procedure was followed that did not use CA. The activity of the catalysts for the hydrodesulfurization (HDS) of a feed containing 3000
ppm 4,6-dimethyldibenzothiophene (4,6-DMDBT) in toluene was measured at 583
K and 3.0
MPa. The resulting catalysts were highly active and among the studied phosphides, Ni
2P exhibited the highest HDS activity with a conversion of 87.7% at a WHSV of 26
h
−1 and a H
2/liquid feed ratio of 625 (v/v). The HDS TOF decreased in the order Ni
2P
>
Ni
x
MoP
>
MoP and for the Ni
x
MoP catalyst, the observed TOF increased with Ni content. |
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ISSN: | 0926-860X 1873-3875 |
DOI: | 10.1016/j.apcata.2009.03.037 |