Adsorption-Induced Structural Changes of Rh Supported by TiO2(110)-(1×2): An STM Study

Berkó, A.; Solymosi, F.

doi:10.1006/jcat.1998.2368

Cited by 92 publications

(112 citation statements)

References 52 publications

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“…This surface complex readily forms following the adsorption of CO on supported Rh. As demonstrated by previous extended X-ray absorption fine structure (EXAFS), [43] FTIR [44][45][46][47] and STM [48,49] studies, the generation of dicarbonyl attached to isolated Rh + ions is the result of the CO-induced oxidative disruption of Rh x nanoparticles. A possible reason for the absence of the Rh + (CO) 2 species following the decomposition of DME is that the amount of CO evolved in the decomposition of DME is not sufficient for the disruption of Rh x crystals, and/or the large amount of hydrogen produced prevents the occurrence of the disruption process.…”

mentioning

confidence: 81%

Production of Hydrogen from Dimethyl Ether over Supported Rhodium Catalysts

2009

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Infrared (IR) spectroscopy revealed that dimethyl ether (DME) undergoes partial dissociation on pure and rhodium‐containing CeO2 at 300 K to yield methoxy and methyl species. This process is promoted by the presence of rhodium. By means of thermal desorption measurements (TPD), the adsorption of DME on Rh/CeO2 at 300 K and subsequent decomposition of DME (Tp≈370 K), releasing H2, CO, CO2, and CH4, with Tp between 420 and 673 K, were ascertained. Rh/CeO2 is an effective catalyst for the decomposition of DME to give H2 (29–35 %), CO (27–30 %) and CH4 (32–38 %) as major products with complete conversion at 673–723 K. Adding water to DME changed the product distribution and increased the selectivity of H2 formation from 30–35 % to 58 % at 723 K. In situ IR spectroscopy showed absorption bands of CO at 2034 and 1893 cm−1 during the reaction at 673–773 K. Deactivation of the catalyst did not occur at 773 K during the time measured (approximately 10 h). Rh deposited on carbon Norit also exhibited a high activity towards the decomposition of DME, but the selectivity towards hydrogen was lower.

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mentioning

confidence: 81%

Production of Hydrogen from Dimethyl Ether over Supported Rhodium Catalysts

2009

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“…CO adsorption on the noble metals supported on oxides is an interesting subject and has been studied by many researchers [1][2][3][4][5]. It has been reported that CO adsorption at 300 K or lower temperatures led to the oxidative disruption of Rh, Ru and Ir crystallites supported on oxides resulting in the formation of metal carbonyl (M n+ (CO) 2 ) surface species [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that CO adsorption at 300 K or lower temperatures led to the oxidative disruption of Rh, Ru and Ir crystallites supported on oxides resulting in the formation of metal carbonyl (M n+ (CO) 2 ) surface species [1][2][3]. Berkó et al [4,5] have studied the reconstruction of metal particles due to CO adsorption on Rh/TiO 2 (1 0 0) and Ir/TiO 2 (1 0 0) by STM method. The systems of CO/oxide-supported Pt and CO/Pt single crystal surfaces have been frequently studied by FTIR and other methods.…”

Section: Introductionmentioning

confidence: 99%

DRIFTS investigation and DFT calculation of the adsorption of CO on Pt/TiO2, Pt/CeO2 and FeOx/Pt/CeO2

Gao

et al. 2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Such restructuring effects may include changes of the particle equilibrium shape 28 , restructuring induced by bulk phase transformation (e.g. oxidation), adsorbate-induced disrupture of small particles 29 , or structural fluctuations of small clusters in the presence of reactants 30 .…”

Section: Reaction Kinetics On Simple and Complex Surfaces: What Is DImentioning

confidence: 99%

Model studies in heterogeneous catalysis at the microscopic level: from the structure and composition of surfaces to reaction kinetics

et al. 2006

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Heterogeneous catalysis is one of the fields of modern technology, in which a characterization of structural and chemical properties of solid surfaces at the microscopic level is of enormous importance. For a long time, such insights have been precluded by the complexity of most catalytically active materials. Recently, substantial progress has been made, however, toward a microscopic-level understanding of complex catalyst surfaces. We discuss the driving factors for these advancements, which are based on the development of new well-defined model systems as well as on advances in experimental technology and theory. Scrutinizing the example of planar model catalysts, we identify the process of linking structural and chemical information to microscopic reaction kinetics as a particular challenging aspect of today's work. We review the kinetic effects which may have an influence on the reaction kinetics on complex surfaces. As an example how structural and kinetic information can be correlated at the microscopic level we discuss the case of surface oxidation and oxygen induced restructuring of Pd nanoparticles as studied by molecular beam methods.

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Adsorption-Induced Structural Changes of Rh Supported by TiO2(110)-(1×2): An STM Study

Cited by 92 publications

References 52 publications

Production of Hydrogen from Dimethyl Ether over Supported Rhodium Catalysts

Production of Hydrogen from Dimethyl Ether over Supported Rhodium Catalysts

DRIFTS investigation and DFT calculation of the adsorption of CO on Pt/TiO2, Pt/CeO2 and FeOx/Pt/CeO2

Model studies in heterogeneous catalysis at the microscopic level: from the structure and composition of surfaces to reaction kinetics

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