Dibenzothiophene hydrodesulfurization activity and surface sites of silica-supported MoP, Ni2P, and NiMoP catalysts

Sun, Feng; Wu, Weicheng; Wu, Zili; Guo, Jun; Wei, Zhimei; Yang, Yongxing; Jiang, Zongxuan; Tian, Fuping; Li, Can

doi:10.1016/j.jcat.2004.09.002

Cited by 157 publications

(68 citation statements)

References 40 publications

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“…The catalytic activities of nickel phosphides in hydrogenation and hydrogenolysis reactions are attributed to their metallic and acidic properties [12,[22][23][24][25], caused by the covalent nature of Ni-P bond in phosphides and a slight charge transfer from Ni to P [25]. Metal phosphides contain weak Brønsted and Lewis acid sites attributed to the presence of unreduced PO x groups and the metal sites with small positive charge, respectively [7,[26][27][28].…”

Section: Introductionmentioning

confidence: 99%

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

et al. 2017

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Two sets of silica-supported nickel phosphide catalysts with a nickel content of about 2.5 and 10 wt % and Ni/P molar ratio 2/1, 1/1 and 1/2 in each set, were prepared by way of a temperature-programmed reduction method using (Ni(CH 3 COO) 2 ) and ((NH 4 ) 2 HPO 4 ) as a precursor. The Ni x P y /SiO 2 catalysts were characterized using chemical analysis N 2 physisorption, XRD, TEM, 31 P MAS NMR. Methyl palmitate hydrodeoxygenation (HDO) was performed in a trickle-bed reactor at 3 MPa and 290 • C with LHSV ranging from 0.3 to 16 h −1 . The Ni/P ratio was found to affect the nickel phosphide phase composition, PO x groups content and catalytic properties in methyl palmitate HDO with the TOF increased along with a decline of Ni/P ratio and a growth of PO x groups' content. Taking into account the possible routes of methyl palmitate conversion (metal-catalyzed hydrogenolysis or acid-catalyzed hydrolysis), we proposed that the enhancement of acid PO x groups' content with the Ni/P ratio decrease provides an enhancement of the rate of methyl palmitate conversion through the acceleration of acid-catalyzed hydrolysis.

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Section: Introductionmentioning

confidence: 99%

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

et al. 2017

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“…A number of bimetallic phosphides such as Ni x Mo y P [25][26][27][28][29][30], Co x Mo y P [31] and Ni x Co y P [32,33] have also been studied because a synergistic effect between the components was foreseen as found for promoted metal sulfides. Unexpectedly, however, these bimetallic phosphide phases did not show enhanced activity over the component Ni, Co or Mo phosphides, except for the case of Co x Ni y P [20] where a 50% increase in conversion was found.…”

Section: Introductionmentioning

confidence: 99%

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Zhao

Oyama

Freund

et al. 2015

Applied Catalysis B: Environmental

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A series of NiFeP/SiO 2 catalysts with different Ni:Fe molar ratios (1:0, 3:1, 1:1, 1:3, 0:1) was investigated for the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene.The Fe component is a good probe for active sites because Ni 2 P and Fe 2 P adopt the same hexagonal crystal structure, yet Fe 2 P is completely inactive for HDS. X-ray diffraction analysis and FTIR spectroscopy of adsorbed CO indicated the formation homologous alloys. At 3.1 MPa and 613 K (340 o C) the activity of the alloys was similar to that of Ni 2 P, which was very high. There was also unprecedented selectivity towards direct desulfurization (DDS). A reconstruction of the NiFe phase occurred to expose more Ni sites, likely driven by the formation of surface Ni-S bonds as observed by EXAFS. The analysis showed that Ni(2) pyramidal sites responsible for hydrogenation were largely replaced by Fe. This left behind Ni(1) tetrahedral sites which favor DDS and explains the reactivity results.

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“…Though traditional HDS catalysts are highly efficient in removing thiols, sulfides, and disulfides, they are inefficient in ultra-deep desulfurization of refractory sulfur-containing compounds, such as 4,6-dimethydibenzothiophene (4,6-DMDBT). Therefore, development of novel HDS catalysts with super high activity is needed [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

Wang

Zhang

et al. 2011

Applied Catalysis A: General

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Dibenzothiophene hydrodesulfurization activity and surface sites of silica-supported MoP, Ni2P, and NiMoP catalysts

Cited by 157 publications

References 40 publications

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

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