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Michael K. Neylon - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic deNO_ x properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO_ x catalytic properties of a new class of open-framework structure materials, Li_6[Mn_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 1 ), [Fe_3(H_2O)_12 V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 2 ), [Co_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 3 ), and Li_6[Ni _3 ^II (H_2O)_12V _16 ^VI V _2 ^V O_42(SO_4)] · 24H_2O ( 4 ), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V_18O_42(XO_4)} , as building block units, interlinked by {–O–M–O–} (M = Mn, 1 ; M = Fe, 2 ; M = Co, 3 ; M = Ni, 4 ) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO_ x } into N_2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative ( 3 ), showed intriguing deNO_ x activity under rich conditions. They remove up to ~ 99% of the toxic NO_ x emissions in 1.5% O_2 with 100% selectivity to N_2. The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N_2. The catalytic reactions occur at moderately low temperatures (400–500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO_ x activity and increased tolerance to oxygen.

  • Catalytic deNOx properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO x catalytic properties of a new class of open-framework structure materials, Li 6 [Mn 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (1), [Fe3(H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (2), [Co 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (3), and Li 6 (Ni II 3 (H 2 O) 12 V VI 16 V V 2 O 42 (SO 4 ]·24H 2 O (4), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V 18 O 42 (XO 4 )}, as building block units, interlinked by {-O-M-O-} (M = Mn, 1; M = Fe, 2; M = Co, 3; M = Ni, 4) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO x } into N 2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative (3), showed intriguing deNO x activity under rich conditions. They remove up to ∼ 99% of the toxic NOy emissions in 1.5% O 2 with 100% selectivity to N 2 . The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N 2 . The catalytic reactions occur at moderately low temperatures (400-500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO x activity and increased tolerance to oxygen.

M. Ishaque Khan - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic deNO_ x properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO_ x catalytic properties of a new class of open-framework structure materials, Li_6[Mn_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 1 ), [Fe_3(H_2O)_12 V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 2 ), [Co_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 3 ), and Li_6[Ni _3 ^II (H_2O)_12V _16 ^VI V _2 ^V O_42(SO_4)] · 24H_2O ( 4 ), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V_18O_42(XO_4)} , as building block units, interlinked by {–O–M–O–} (M = Mn, 1 ; M = Fe, 2 ; M = Co, 3 ; M = Ni, 4 ) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO_ x } into N_2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative ( 3 ), showed intriguing deNO_ x activity under rich conditions. They remove up to ~ 99% of the toxic NO_ x emissions in 1.5% O_2 with 100% selectivity to N_2. The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N_2. The catalytic reactions occur at moderately low temperatures (400–500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO_ x activity and increased tolerance to oxygen.

  • Catalytic deNOx properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO x catalytic properties of a new class of open-framework structure materials, Li 6 [Mn 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (1), [Fe3(H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (2), [Co 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (3), and Li 6 (Ni II 3 (H 2 O) 12 V VI 16 V V 2 O 42 (SO 4 ]·24H 2 O (4), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V 18 O 42 (XO 4 )}, as building block units, interlinked by {-O-M-O-} (M = Mn, 1; M = Fe, 2; M = Co, 3; M = Ni, 4) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO x } into N 2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative (3), showed intriguing deNO x activity under rich conditions. They remove up to ∼ 99% of the toxic NOy emissions in 1.5% O 2 with 100% selectivity to N 2 . The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N 2 . The catalytic reactions occur at moderately low temperatures (400-500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO x activity and increased tolerance to oxygen.

Maurizio Brunori - One of the best experts on this subject based on the ideXlab platform.

  • mini myoglobin electron paramagnetic resonance and reversible oxygenation of the Cobalt Derivative
    Journal of Molecular Biology, 1991
    Co-Authors: G De Sanctis, Giancarlo Falcioni, Francesco Grelloni, Alessandro Desideri, Francesca Polizio, B Giardina, Franca Ascoli, Maurizio Brunori
    Abstract:

    Abstract Mini-myoglobin, obtained by limited proteolysis of horse heart myoglobin (residues 32 to 139), represents a good model for testing the correlation between an exon and a protein domain. We have shown that ligand binding kinetics, spectral and folding features of mini-myoglobin are very similar to those of native myoglobin. In order to develop further the analysis of the structure-function relationship in this mini-protein, mini-globin was reconstituted with the heme moiety in which iron is replaced by Cobalt. The Soret absorption spectra of oxy and deoxy Cobaltous mini-myoglobin are very similar to those of Cobaltous myoglobin Derivatives; in addition, Co-mini-myoglobin binds oxygen reversibly with an n value ~ 1 and a p 50 value of 45 to 50 mm Hg (the same as Co-myoglobin). Oxy Co-mini-myoglobin shows a well-resolved electron paramagnetic resonance (e.p.r.) spectrum typical of an oxygenated hemoprotein, while the spectrum of the deoxy Derivative, although similar to that of deoxy Co-myoglobin, displays a lower resolution of the complex hyperfine structure. Moreover, photodissociation experiments on oxy Co-mini-myoglobin allow e.p.r. detection of an intermediate state, already observed in most hemoproteins and diagnostic for the interaction of bound oxygen with the distal histidine residue. Thus, reconstitution of miniglobin with Cobalt protoporphyrin IX has provided, for the first time, a stable oxygenated complex that reflects a correct folding of the protein surrounding the heme pocket and possesses the functional behaviour typical of a hemoprotein.

Saadia Tabussum - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic deNO_ x properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO_ x catalytic properties of a new class of open-framework structure materials, Li_6[Mn_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 1 ), [Fe_3(H_2O)_12 V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 2 ), [Co_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 3 ), and Li_6[Ni _3 ^II (H_2O)_12V _16 ^VI V _2 ^V O_42(SO_4)] · 24H_2O ( 4 ), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V_18O_42(XO_4)} , as building block units, interlinked by {–O–M–O–} (M = Mn, 1 ; M = Fe, 2 ; M = Co, 3 ; M = Ni, 4 ) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO_ x } into N_2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative ( 3 ), showed intriguing deNO_ x activity under rich conditions. They remove up to ~ 99% of the toxic NO_ x emissions in 1.5% O_2 with 100% selectivity to N_2. The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N_2. The catalytic reactions occur at moderately low temperatures (400–500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO_ x activity and increased tolerance to oxygen.

  • Catalytic deNOx properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO x catalytic properties of a new class of open-framework structure materials, Li 6 [Mn 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (1), [Fe3(H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (2), [Co 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (3), and Li 6 (Ni II 3 (H 2 O) 12 V VI 16 V V 2 O 42 (SO 4 ]·24H 2 O (4), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V 18 O 42 (XO 4 )}, as building block units, interlinked by {-O-M-O-} (M = Mn, 1; M = Fe, 2; M = Co, 3; M = Ni, 4) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO x } into N 2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative (3), showed intriguing deNO x activity under rich conditions. They remove up to ∼ 99% of the toxic NOy emissions in 1.5% O 2 with 100% selectivity to N 2 . The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N 2 . The catalytic reactions occur at moderately low temperatures (400-500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO x activity and increased tolerance to oxygen.

Christopher L. Marshall - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic deNO_ x properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO_ x catalytic properties of a new class of open-framework structure materials, Li_6[Mn_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 1 ), [Fe_3(H_2O)_12 V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 2 ), [Co_3(H_2O)_12V_18O_42(XO_4)] · 24H_2O (X = V, S) ( 3 ), and Li_6[Ni _3 ^II (H_2O)_12V _16 ^VI V _2 ^V O_42(SO_4)] · 24H_2O ( 4 ), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V_18O_42(XO_4)} , as building block units, interlinked by {–O–M–O–} (M = Mn, 1 ; M = Fe, 2 ; M = Co, 3 ; M = Ni, 4 ) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO_ x } into N_2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative ( 3 ), showed intriguing deNO_ x activity under rich conditions. They remove up to ~ 99% of the toxic NO_ x emissions in 1.5% O_2 with 100% selectivity to N_2. The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N_2. The catalytic reactions occur at moderately low temperatures (400–500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO_ x activity and increased tolerance to oxygen.

  • Catalytic deNOx properties of novel vanadium oxide based open-framework materials
    Catalysis Letters, 2006
    Co-Authors: M. Ishaque Khan, Saadia Tabussum, Christopher L. Marshall, Michael K. Neylon
    Abstract:

    The deNO x catalytic properties of a new class of open-framework structure materials, Li 6 [Mn 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (1), [Fe3(H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (2), [Co 3 (H 2 O) 12 V 18 O 42 (XO 4 )]·24H 2 O (X = V, S) (3), and Li 6 (Ni II 3 (H 2 O) 12 V VI 16 V V 2 O 42 (SO 4 ]·24H 2 O (4), have been studied. The crystal structures of these novel systems consist of three-dimensional arrays of vanadium oxide clusters {V 18 O 42 (XO 4 )}, as building block units, interlinked by {-O-M-O-} (M = Mn, 1; M = Fe, 2; M = Co, 3; M = Ni, 4) bridges. Their open-framework structures contain cavities, similar to those observed in conventional zeolites, which are occupied by exchangeable cations and/or readily removable water of hydration. The catalysts derived from these materials were tested for the selective catalytic reduction (SCR) of nitrogen oxides {NO x } into N 2 using a hydrocarbon, propylene, as the reducing agent. The catalysts were ineffective under lean burn conditions. However, the new catalysts, especially the one derived from the Cobalt Derivative (3), showed intriguing deNO x activity under rich conditions. They remove up to ∼ 99% of the toxic NOy emissions in 1.5% O 2 with 100% selectivity to N 2 . The active phase of the catalysts exhibit good stability, can be readily regenerated, and are selective to the desired product-N 2 . The catalytic reactions occur at moderately low temperatures (400-500 °C). The catalysts were characterized by FT-IR, temperature programmed reactions (TPR and TPO), SEM, BET surface area measurements, elemental analysis, and X-ray diffraction (XRD). Additional advanced techniques were used to further characterize the catalyst phases that showed most promising deNO x activity and increased tolerance to oxygen.