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Tsubaki, Noritatsu

doi:10.1023/a:1023548608733

Cited by 41 publications

(20 citation statements)

References 53 publications

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“…13,14]. According to previous studies over Rh and Pt catalysts supported on TiO 2 , the reduction peaks located above 300C can be attributed to the partial reduction of the TiO 2 support, which was caused by the SMSI and induced TiO 2−x species (x < 2) [15].…”

Section: Tablementioning

confidence: 71%

TPR study and catalytic performance of noble metals modified Al2O3, TiO2 and ZrO2 for low-temperature NH3-SCO

Jabłońska

2015

Catalysis Communications

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Section: Tablementioning

confidence: 71%

TPR study and catalytic performance of noble metals modified Al2O3, TiO2 and ZrO2 for low-temperature NH3-SCO

Jabłońska

2015

Catalysis Communications

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“…Tsubaki and Fujimoto [139] found that the strong interaction Pd has with CeO 2 resembles an SMSI effect. By reduction at 773 K, the conversion at 503 K and 3 MPa with H 2 /CO = 2 dropped to half of that at 673 K and, in addition to methane, significant amounts of higher hydrocarbons were formed; also, some formation of Ce 2 O 3 was detected by XRD.…”

Section: Pd-based Catalystsmentioning

confidence: 99%

Methanol Synthesis

Hansen¹,

Nielsen²

2008

Handbook of Heterogeneous Catalysis

133

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The sections in this article are Introduction Thermodynamics Methanol Synthesis Catalysts Introduction Zn O / Cr 2 O 3 Catalyst Copper‐Based Catalysts Cu / Zn O + Element ( Al , Cr , … ) Promotion of Cu / Zn O / MOx Catalysts Cu / Zr O 2 Other Cu , Cu / Me , Cu / Me Ox Catalysts Pd ‐Based Catalysts Sulfide Catalysts Other Catalysts Activation of Cu / Zn Catalyst Activity as a Function of the Nature of Copper‐Based Catalysts Catalyst Deactivation Sintering Sulfur Poisoning Other Poisons By‐Product Formation Reaction Mechanism(s) and Active Sites Cu + in a Zn O Matrix as the Active Center The S chottky Junction Theory Partly Oxidized Copper Independent of Support as Active Sites Metallic Copper in Dynamic Interaction with the Support Cu –Zinc Surface Alloy Model Water Gas Shift Reaction Kinetics Reaction Rate Equations Diffusion Restrictions Kinetics in Slurry Phase Methanol Synthesis Methanol Synthesis Technology Synthesis Gas Preparation Natural Gas Reforming Adiabatic Pre‐Reforming Tubular, Fired Reforming Autothermal Reforming and Oxygen‐Fired Secondary Reforming Gasification of Heavy Oil, Coal or Biomass Coproduction in Ammonia Plants and Use of Off‐gases Economics of Synthesis Gas Preparation Reactor Systems and Synthesis Loop Layout Slurry Phase Reactor Types Methanol Purification Concepts Circumventing the Equilibrium Limitations Other Methanol Synthesis Routes and Technologies Methanol Synthesis by Methane Activation Conclusion

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“…This may indicate that the change in conversion is instead related to an increased/decreased accessibility of the active IMC particles than to a change of the active phase itself. Accessibility can be increased by changes in the metal-support interaction after high-temperature reduction [48] in the case of Pd 5 Ga 3 /a-Ga 2 O 3 , by breakdown of porosity of the amorphous support aggregates for Pd 2 Ga/g-Ga 2 O 3 , or by coke formation. [49] Methanol steam reforming MSR, which yields H 2 and CO 2 , as detailed in Equation (1), is among the most promising on-board hydrogen production processes for fuel cells.…”

Section: Semi-hydrogenation Of Acetylenementioning

confidence: 99%

Ga‐Pd/Ga₂O₃ Catalysts: The Role of Gallia Polymorphs, Intermetallic Compounds, and Pretreatment Conditions on Selectivity and Stability in Different Reactions

Zhang

Kunkes

et al. 2012

ChemCatChem

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A series of gallia‐supported Pd‐Ga catalysts that consist of metallic nanoparticles on three porous polymorphs of Ga2O3 (α‐, β‐, and γ‐Ga2O3) were synthesized by a controlled co‐precipitation of Pd and Ga. The effects of formation of Ga‐Pd intermetallic compounds (IMCs) were studied in four catalytic reactions: methanol steam reforming, hydrogenation of acetylene, and methanol synthesis by CO and CO2 hydrogenation reactions. The IMC Pd2Ga forms upon reduction of α‐ and β‐Ga2O3‐supported materials in hydrogen at temperatures of 250 and 310 °C, respectively. At higher temperatures, Ga‐enrichment of the intermetallic particles is observed, leading to formation of Pd5Ga3 before the support itself is reduced at temperatures above 565 °C. In the case of Ga‐Pd/γ‐Ga2O3, no information about the metal particles could be obtained owing to their very small size and high dispersion; however, the catalytic results suggest that the IMC Pd2Ga also forms in this sample. Pd2Ga/gallia samples show a stable selectivity towards ethylene in acetylene hydrogenation (≈75 %), which is higher than for a monometallic Pd reference catalyst. An even higher selectivity of 80 % was observed for Pd5Ga3 supported on α‐Ga2O3. In methanol steam reforming, the Ga‐Pd/Gallia catalysts showed, in contrast to Pd/Al2O3, selectivity towards CO2 of up to 40 %. However, higher selectivities, which have been reported for Pd2Ga in literature, could not be reproduced in this study, which might be a result of particle size effects. The initially higher selectivity of the Pd5Ga3‐containing samples was not stable, suggesting superior catalytic properties for this IMC, but that re‐oxidation of Ga species and formation of Pd2Ga occurs under reaction conditions. In methanol synthesis, CO hydrogenation did not occur, but a considerable methanol yield from a CO2/H2 feed was observed for Pd2Ga/α‐Ga2O3.

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Untitled

Cited by 41 publications

References 53 publications

TPR study and catalytic performance of noble metals modified Al2O3, TiO2 and ZrO2 for low-temperature NH3-SCO

TPR study and catalytic performance of noble metals modified Al2O3, TiO2 and ZrO2 for low-temperature NH3-SCO

Methanol Synthesis

Ga‐Pd/Ga₂O₃ Catalysts: The Role of Gallia Polymorphs, Intermetallic Compounds, and Pretreatment Conditions on Selectivity and Stability in Different Reactions

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Untitled

Cited by 41 publications

References 53 publications

TPR study and catalytic performance of noble metals modified Al2O3, TiO2 and ZrO2 for low-temperature NH3-SCO

TPR study and catalytic performance of noble metals modified Al2O3, TiO2 and ZrO2 for low-temperature NH3-SCO

Methanol Synthesis

Ga‐Pd/Ga2O3 Catalysts: The Role of Gallia Polymorphs, Intermetallic Compounds, and Pretreatment Conditions on Selectivity and Stability in Different Reactions

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Product

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Ga‐Pd/Ga₂O₃ Catalysts: The Role of Gallia Polymorphs, Intermetallic Compounds, and Pretreatment Conditions on Selectivity and Stability in Different Reactions