Hydrogenation of carbon dioxide and carbon monoxide over supported rhodium catalysts under 10 bar pressure

Inoue, Takashi; Iizuka, Tokio; Tanabe, Kozo

doi:10.1016/s0166-9834(00)81390-1

Cited by 64 publications

(49 citation statements)

References 18 publications

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“…It was found that Rh/TiO 2 reduced at low temperature (533 K) exhibited high activity and low methanol selectivity. The activity change with reduction temperature was suggested to result not only from the change in the surface area of metal but also from the change in the electronic state of Rh [22]. The initial rate of CO 2 hydrogenation significantly increased with increasing reduction temperature up to 673 K but decreased drastically in a few seconds time-on-stream.…”

Section: Introductionmentioning

confidence: 99%

“…H 2 reaction on Rh/TiO 2 and the product distribution was shown to follow Anderson-Schulz-Flory statistic. When hydrogenation of CO 2 was carried out on supported Rh at higher pressure (10 atm), not only methane but also methanol was also detected [22]. It was found that Rh/TiO 2 reduced at low temperature (533 K) exhibited high activity and low methanol selectivity.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogenation of Carbon Dioxide on Rh, Au and Au–Rh Bimetallic Clusters Supported on Titanate Nanotubes, Nanowires and TiO2

et al. 2012

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Supported gold, rhodium and bimetallic rhodium-core-gold-shell catalysts were prepared. The supports were TiO 2 as well as titanate nanotube and nanowire formed in the hydrothermal conversion of titania. The catalytic properties were tested in the CO 2 hydrogenation at 493 K. The amount and the reactivity of the surface carbonaceous deposit were determined by temperatureprogrammed reduction. The surfaces of the materials were characterized by X-ray photoelectron and low-energy ion scattering spectroscopy (LEIS). The surface forms during the catalytic reaction were identified by DRIFT spectroscopy. On the XP spectra of bimetallic catalysts the existence of highly dispersed gold particles could be observed besides the metallic form on all supports. Small Rh particles could also be identified on the titanate supports. LEIS spectra demonstrated that Rh-core-Au-shell particles formed, since no scattering from Rh was detected. The main product of CO 2 hydrogenation was CH 4 on all catalysts. IR spectra revealed the existence of CO and formate species on the surface. In addition, a new band was observed around 1,770 cm-1 which was assigned as tilted CO. It is bonded to Rh and interacts with a nearby the oxygen vacancy of the support. Agglomeration of highly dispersed Rh was observed on bimetallic samples induced by reaction or reactant. Keywords CO 2 hydrogenation Á Titania nanowire Á Titania nanotube Á Core-shell structure Á Gold Á Rhodium

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogenation of Carbon Dioxide on Rh, Au and Au–Rh Bimetallic Clusters Supported on Titanate Nanotubes, Nanowires and TiO2

et al. 2012

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“…The support exerted a marked influence on the specific activity of the noble metals, the most effective support being TiO 2 and the least effective one SiO 2 [3,5,6]. When the hydrogenation of CO 2 was carried out on supported Rh at higher pressure (10 atm) not only methane but methanol was detected as well [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of H2S on the hydrogenation of carbon dioxide over supported Rh catalysts

et al. 2007

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The hydrogenation of CO 2 was studied on supported noble metal catalysts in the presence of H 2 S. In the reaction gas mixture containing 22 ppm H 2 S the reaction rate increased on TiO 2 and on CeO 2 supported metals (Ru, Rh, Pd), but on all other supported catalysts or when the H 2 S content was higher (116 ppm) the reaction was poisoned. FTIR measurements revealed that in the surface interaction of H 2 + CO 2 on Rh/TiO 2 Rh carbonyl hydride, surface formate, carbonates and surface formyl were formed. On the H 2 S pretreated catalyst surface formyl species were missing. TPD measurements showed that adsorbed H 2 S desorbed as SO 2 , both from TiO 2 -supported metals and from the support. IR, XP spectroscopy and TPD measurements demonstrated that the metal became apparently more positive when the catalysts were treated with H 2 S and when the sulfur was built into the support. The promotion effect of H 2 S was explained by the formation of new centers at the metal/support interface.

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“…Another problem of the hydrogenation of carbon dioxide is that its products are common and lowvalue materials such as methanol [1][2][3][4][5][6] and methane. [7][8][9][10][11] However, carbon dioxide is the most common and unlimited carbon resource. Therefore, the possibility to produce materials that are very valuable and used in large quantities in industry will promote the utilization of carbon dioxide.…”

Section: Introductionmentioning

confidence: 99%

Syntheses of Isobutane and Branched Higher Hydrocarbons from Carbon Dioxide and Hydrogen over Composite Catalysts

Tan

Fujiwara

Ando

et al. 1999

Ind. Eng. Chem. Res.

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The hydrogenation of carbon dioxide was examined over various composite catalysts composed of Fe-Zn-M catalyst and zeolite. Fe-Zn-Zr/HY composite catalyst was confirmed to be efficient for the highly selective production of isobutane, which is regarded as a synthetic intermediate of MTBE (methyl tert-butyl ether). The composite catalyst of Fe-Zn-Zr catalyst with H-ZMS-5 formed C 5+ hydrocarbons in good yield. The ratios of branched hydrocarbons in C 5+ ones, which are suitable for high-octane gasoline, were over 90%.

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Hydrogenation of carbon dioxide and carbon monoxide over supported rhodium catalysts under 10 bar pressure

Cited by 64 publications

References 18 publications

Hydrogenation of Carbon Dioxide on Rh, Au and Au–Rh Bimetallic Clusters Supported on Titanate Nanotubes, Nanowires and TiO2

Hydrogenation of Carbon Dioxide on Rh, Au and Au–Rh Bimetallic Clusters Supported on Titanate Nanotubes, Nanowires and TiO2

Effect of H2S on the hydrogenation of carbon dioxide over supported Rh catalysts

Syntheses of Isobutane and Branched Higher Hydrocarbons from Carbon Dioxide and Hydrogen over Composite Catalysts

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