Carbon dioxide hydrogenation on rhodium supported on transition metal oxides

Trovarelli, Alessandro; Mustazza, Carlo; Dolcetti, Giuliano; Kasˇpar, Jan; Graziani, M.

doi:10.1016/s0166-9834(00)81593-6

Cited by 44 publications

(13 citation statements)

References 22 publications

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“…The CH, selectivity was almost reversed by the reduction at 573 K, while conversion recovered to a slight degree. Trovarelli et al (1990) reported that the CH, production rate decreased and the CO production rate increased by the SMSI effect when WTiO, and RhiNb,O, catalysts were reduced at 723 K. After these catalysts were reduced at 473 K, the activity and the selectivity were close to those observed for the catalyst reduced only at 473 K. In our case, however, the conversion reduced by half. We estimated the crystallite size from the half-width of the rhodium reflex in the X-ray diffraction diagrams.…”

Section: Reduct Ion Temperature [K]supporting

confidence: 77%

Increase in the thermal stability during the methanation of CO₂ over a Rh catalyst prepared from an amorphous alloy

et al. 1998

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The hydrogenation of CO, was investigated over a Rh catalyst prepared from an amorphous Rh2,Zr8, alloy. After the reaction, the catalyst was regenerated by oxidation in air and reduction in H,. It was observed that the reaction activity increased with the repetition of regeneration. We also prepared the Rh/ZrO, catalyst by the conventional impregnation method. The difference in the turnover frequency between the alloy-precursor catalyst and the conventionally prepared catalyst was small. For the alloy-precursor catalyst, however, the conversion and CH, selectivity were stable at 723 K, whereas the conversion and CH, selectivity decreased with time-on-stream even at 673 K for the catalyst prepared by the conventional impregnation method.On a etudie I'hydrogenation du CO, sur un catalyseur Rh prepare a partir d'un alliage amorphe Rh,,Zr,,. Apres la reaction, le catalyseur a kte regenere par oxydation dans I'air et reduction du H,. On a observe que I'activite de la reaction augmentait avec la repetition de la regeneration. Le catalyseur Rh/ZrO, a egalement ete prepare par la methode d'impregnation classique. La difference dans la frequence de renouvellement entre le catalyseur alliage-precurseur et le catalyseur prepare selon la methode conventionnelle etait faible. Cependant, pour le catalyseur alliage-precurseur, la conversion et la selectivite du CH, etaient stables a 723 K, tandis que la conversion et la selectivite du CH, diminuaient avec le temps d'utilisation mbme a 673 K pour le catalyseur prepare par la methode d'impregnation classique.

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Section: Reduct Ion Temperature [K]supporting

confidence: 77%

Increase in the thermal stability during the methanation of CO₂ over a Rh catalyst prepared from an amorphous alloy

et al. 1998

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“…The major contribution arises from the bulk O 2 À oxygen atoms, located at 530.4 eV, which is the value usually reported for TiO 2 samples [183]. The angle-resolved XPS experiments suggest strongly that four kinds of oxygen atoms could be present on the TiO 2 (110) surface, namely: threefold nearsurface oxygen atoms, which are identical to bulk ones (530.4 eV); twofold ones, referred to as "bridging" oxygen atoms (531.6 eV) [196,197] and single-fold ones, denoted "top" oxygen (532.6 eV) [198][199][200]. The fourth peak at 533.4 eV detected at 293 K can be attributed to adsorbed water [198].…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 68%

“…[233]. [196,197,304,305]. Rh/titanate nanocomposites with different Rh concentrations were produced by impregnating titanate nanowires and nanotubes with mixtures of calculated volumes of RhCl 3 Â 3 H 2 O (Johnson Matthey) solutions to yield 1 and 2.5 wt% metal content.…”

Section: 222mentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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“…Hydrocarbons produced from gaseous CO/CO 2 and H 2 in a surface-catalyzed process often display ASF distribution (Shu 2003;Trovarelli et al 1990;Nowicki 2005). Propane, n-butane and n-pentane were produced from dissolved CO 2 in our experiment and shown in ASF distribution, indicating that the surface-catalyzed reaction mechanism probably worked in this experiment with cobalt-bearing magnetite.…”

Section: Cobalt-bearing Magnetite As a Catalyst In Production Of N-c mentioning

confidence: 59%

The Abiotic Formation of Hydrocarbons from Dissolved CO2 Under Hydrothermal Conditions with Cobalt-Bearing Magnetite

Zhou

Qinye

2008

Orig Life Evol Biosph

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Conversion of CO 2 to organic compounds in hydrothermal systems is important in understanding prebiotic chemical evolution leading to the origin of life. However, organic compounds with carbon number of more than 3 have never been produced from dissolved CO 2 in simulated hydrothermal experiments. In this paper, we report that not only CH 4 , C 2 H 6 and C 3 H 8 , but also n-C 4 H 10 and n-C 5 H 12 could be produced from dissolved CO 2 and H 2 in the presence of cobalt-bearing magnetite at 300°C and 30 MPa. It is shown that unbranched alkanes in Anderson-Schulz-Flory distribution were the dominant hydrocarbon products produced from dissolved CO 2 catalyzed by cobalt-bearing magnetite under certain hydrothermal conditions. It is proposed that magnetite with other transition metals may act potentially as effective mineral catalysts for abiotic formation of organic compounds from dissolved CO 2 in hydrothermal systems.

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Carbon dioxide hydrogenation on rhodium supported on transition metal oxides

Cited by 44 publications

References 22 publications

Increase in the thermal stability during the methanation of CO₂ over a Rh catalyst prepared from an amorphous alloy

Increase in the thermal stability during the methanation of CO₂ over a Rh catalyst prepared from an amorphous alloy

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

The Abiotic Formation of Hydrocarbons from Dissolved CO2 Under Hydrothermal Conditions with Cobalt-Bearing Magnetite

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Carbon dioxide hydrogenation on rhodium supported on transition metal oxides

Cited by 44 publications

References 22 publications

Increase in the thermal stability during the methanation of CO2 over a Rh catalyst prepared from an amorphous alloy

Increase in the thermal stability during the methanation of CO2 over a Rh catalyst prepared from an amorphous alloy

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

The Abiotic Formation of Hydrocarbons from Dissolved CO2 Under Hydrothermal Conditions with Cobalt-Bearing Magnetite

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Increase in the thermal stability during the methanation of CO₂ over a Rh catalyst prepared from an amorphous alloy

Increase in the thermal stability during the methanation of CO₂ over a Rh catalyst prepared from an amorphous alloy