Phosphorus Promotion of Ni(Co)-Containing Mo-Free Catalysts in Quinoline Hydrodenitrogenation

Robinson, W.R.A.M.; Gestel, J.N.M. van; Korányi, Tamás I.; Eijsbouts, S.; Kraan, A.M. van der; Veen, J.A.R. van; Beer, V.H.J. de

doi:10.1006/jcat.1996.0216

Cited by 149 publications

(57 citation statements)

References 24 publications

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“…The HDN TOR of the catalysts with P added to the support is higher than the reference sulfide catalyst, and both supported and unsupported Mo 2 C catalyst. A similar positive effect of P additive for the HDN reaction was observed by Eijisbouts et al [16] and Robinson et al [17]. In addition, the catalyst with P co-impregnated on the support has slightly higher HDN activity than the catalyst synthesized on a P treated γ-Al 2 O 3 .…”

Section: Reactivitysupporting

confidence: 77%

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Chen¹,

Cox²,

Allen³

et al. 1998

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Section: Reactivitysupporting

confidence: 77%

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Chen¹,

Cox²,

Allen³

et al. 1998

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“…H3PO4 probably reacts with Al2O3 and SiO2 _ Al2O3 to form AlPO4, rather than reacts with Ni to form Ni2P 16) . XPS analysis revealed that AlPO4 was formed in Ni2P/Al2O3 catalysts, whereas silicon phosphates did not occur in Ni2P/SiO2 catalysts 24) .…”

Section: Effect Of Supports On Formation Of Ni2p Andmentioning

confidence: 99%

“…The profile of Rh _ 1.5P/Al2O3 catalyst showed no reduction peaks from 200 to 600 , but H2 consumption increased above 700 . Phosphate reacts with the surface of Al2O3 to form AlPO4 in the Ni2P/Al2O3 catalyst 16), 24) . Therefore, the H2 consumption observed above 700 was attributed to the reduction of AlPO4.…”

Section: Effect Of Supports On Formation Of Ni2p Andmentioning

confidence: 99%

“…Various methods for preparing highly active CoMo-based HDS catalysts, such as the Co chemical vapor deposition (CVD) technique 1), 4) , and addition of phosphorus 1),6), 7) and chelating agents 1),8), 9) , have been widely investigated to form the Co _ Mo _ S phase. Furthermore, new phases active as new HDS catalysts, such as carbides 10) 14) , nitrides 10),11), 15) , and phosphides 2),3),14), 16) 38) , have been reported. In particular, transition metal phosphides, such as , have received extensive attention 2),3), 34) .…”

Section: Introductionmentioning

confidence: 99%

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Noble Metal Phosphides as New Hydrotreating Catalysts: Highly Active Rhodium Phosphide Catalyst

Kanda

Uemichi

2015

J. Jpn. Petrol. Inst.

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Metal phosphide has been widely investigated as a hydrotreating catalyst. The preparation and performance of noble metal phosphide catalyst was examined to develop new phosphide hydrotreating catalysts. The supports affect reducibility of phosphate as a P precursor. Since phosphate does not strongly interact with SiO2 and TiO2 supports, Rh2P was easily formed on these supports. Furthermore, formation of Rh2P enhanced the hydrodesulfurization (HDS) activity of supported Rh _ P catalyst. The type of noble metal (NM) and P/NM ratio also strongly affect formation of noble metal phosphide and HDS activity. Excess P facilitates formation of noble metal phosphides at lower reduction temperature. In contrast, excess P causes the aggregation of noble metal phosphide and formation of phosphorus rich noble metal phosphide. Rh _ 1.5P/SiO2 catalyst had high and stable activity for HDS reaction. Furthermore, this catalyst showed significantly higher hydrodenitrogenation (HDN) activity than sulfided NiMoP/Al2O3 catalyst. Therefore, Rh2P has great potential as a new hydrotreating catalyst.

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“…[1][2][3][4][5][6] Recently, transition-metal phosphides have also been found to possess excellent catalytic properties for HDS 7 and HDN reactions. [8][9][10] It was found that molybdenum phosphides were intrinsically the most active catalysts in hydroprocessing reactions among a series of catalysts. [11][12][13][14] However, although many investigations have been conducted on catalytic reactivities, very little work has been done toward the fundamental understanding of the surface-active sites of molybdenum phosphides, and several questions concerning the nature of the surface-active sites on transition-metal phosphide catalysts still remain.…”

Section: Introductionmentioning

confidence: 99%

Carbon Monoxide Adsorption on Molybdenum Phosphides: Fourier Transform Infrared Spectroscopic and Density Functional Theory Studies

Feng

Liang

et al. 2003

J. Phys. Chem. B

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Molybdenum phosphide (MoP) and supported molybdenum phosphide (MoP/γ-Al 2 O 3 ) have been prepared by the temperature-programmed reduction method. The surface sites of the MoP/γ-Al 2 O 3 catalyst were characterized by carbon monoxide (CO) adsorption with in situ Fourier transform infrared (FT-IR) spectroscopy. A characteristic IR band at 2037 cm -1 was observed on the MoP/γ-Al 2 O 3 that was reduced at 973 K. This band is attributed to linearly adsorbed CO on Mo atoms of the MoP surface and is similar to IR bands at 2040-2060 cm -1 , which correspond to CO that has been adsorbed on some noble metals, such as platinum, palladium, and rhodium. Density functional calculations of the structure of molybdenum phosphides, as well as CO chemisorption on the MoP(001) surface, have also been studied on periodic surface models, using the generalized gradient approximation (GGA) for the exchange-correlation functional. The results show that the chemisorption of CO on MoP occurred mainly on top of molybdenum, because the bonding of CO requires a localized mininum potential energy. The adsorption energy obtained is ∆H ads ≈ -2.18 eV, and the vibrational frequency of CO is 2047 cm -1 , which is in good agreement with the IR result of CO chemisorption on MoP/γ-Al 2 O 3 .

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Phosphorus Promotion of Ni(Co)-Containing Mo-Free Catalysts in Quinoline Hydrodenitrogenation

Cited by 149 publications

References 24 publications

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Noble Metal Phosphides as New Hydrotreating Catalysts: Highly Active Rhodium Phosphide Catalyst

Carbon Monoxide Adsorption on Molybdenum Phosphides: Fourier Transform Infrared Spectroscopic and Density Functional Theory Studies

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