EXAFS Peaks and TPR Characterizing Bimetallic Interactions: Effects of Impregnation Methods on the Structure of Pt-Ru/C Catalysts

Chen, Nan-Yu; Ming-chun, Liu; Yang, Shih-Chieh; Chang, Juu En

doi:10.1155/2014/347078

Cited by 6 publications

(6 citation statements)

References 69 publications

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“…The first reduction peak can be attributed to the coreduction of Pt and Re, indicating that Re is in close interaction with Pt. This promotion of the Re reduction can be caused by hydrogen spillover from the reduced Pt, which has been reported in the literature. ,− …”

Section: Resultsmentioning

confidence: 59%

“…Reduction peaks of monometallic platinum supported on carbon have been reported in the range of 150−300 °C, 50 whereas, for Re reduction, temperatures are higher, between 250 °C and 450 °C. 51 The peaks observed at 85−150 °C correspond to complete reduction of Pt, while those at 375 °C for PRC31 and at 425 °C for PRC11 are consistent with the results reported for the reduction of Re species supported on carbon.…”

Section: ■ Introductionmentioning

confidence: 99%

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Hydrodeoxygenation of Isoeugenol over Carbon-Supported Pt and Pt–Re Catalysts for Production of Renewable Jet Fuel

et al. 2021

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A series of monometallic platinum and bimetallic platinum−rhenium catalysts supported on mesoporous carbon Sibunit, which is a type of mesoporous, microcrystalline carbon, were investigated for hydrodeoxygenation (HDO) of isoeugenol (IE) at 200−300 °C and 30 bar of H 2 , using dodecane as a solvent. Catalytic activity was tested in a batch reactor to screen the catalysts and, for comparison, also in the continuous mode. For batch experiments, complete conversion, and a high yield of the desired product, propylcyclohexane (PCH), were obtained for all bimetallic PtRe/Sibunit in 240 min, with the highest yield of PCH when Pt:Re ratio was 1:1 or 1:3. The results for Pt−Re (1:1) were reproducible, in terms of catalytic activity and reusability of catalysts, which showed no deactivation. Monometallic Pt catalysts displayed low activity. Continuous experiments were performed with PtRe(1:1)/Sibunit at 30 bar H 2 , 0.5 mL/min of the liquid flow, and temperatures between 75 °C and 200 °C. The distribution of products showed deoxygenation at higher temperatures, while at lower temperatures, mainly oxygenated products were formed. XPS results confirmed the presence of ReOx species, where an increase in the platinum loading resulted in a decrease in the fraction of ReOx species and subsequently lower PCH yield.

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Section: Resultsmentioning

confidence: 59%

Section: ■ Introductionmentioning

confidence: 99%

Hydrodeoxygenation of Isoeugenol over Carbon-Supported Pt and Pt–Re Catalysts for Production of Renewable Jet Fuel

et al. 2021

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“…Reduction profiles for monometallic and bimetallic catalysts were determined by TPR (Figure and Table ). Reduction peaks for Pt supported on activated carbon have been reported in the 150–300 °C range, for Re it was between 250 and 450 °C . Furthermore, shifts in the reduction peaks have been reported due to the formation of the Pt–Re alloy. , Additionally, migration of ReOx species toward Pt 0 has also been reported, which can be a result of weak interactions between the metal and the carbon support …”

Section: Resultsmentioning

confidence: 98%

Bifunctional Pt–Re Catalysts in Hydrodeoxygenation of Isoeugenol as a Model Compound for Renewable Jet Fuel Production

et al. 2022

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Bimetallic platinum–rhenium catalysts supported on activated carbon were tested for the hydrodeoxygenation (HDO) of isoeugenol at 250 °C and 30 bar of H2 in a batch reactor. The catalysts were characterized by inductively coupled plasma atomic emission spectrometry (ICP-IES), N2 physisorption, electron microscopy (high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), transmission electron microscopy (TEM)), temperature-programmed reduction, X-ray absorption spectroscopy (X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)), and temperature-programmed desorption of ammonia. Bimetallic catalysts containing Pt and Re were much more active than monometallic Pt/C and Re/C. Complete isoeugenol conversion, high propylcyclohexane yield (99%), and a high liquid-phase mass balance (77%) were obtained for the catalyst with the highest Re loading, Pt–Re(1:5)/C. Such high activity is attributed to a synergistic effect between the reduced Pt and the Re-oxide species, as both metal active sites and oxygen vacancies are required for HDO. The apparent activation energy for the HDO of isoeugenol with Pt–Re(1:5)/C was 44 kJ/mol.

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“…The reduction peaks observed below 200 °C can be attributed to the presence of Pt–Ru, − which otherwise cannot be observed for samples without Pt–Ru impregnation. , A broad peak is observed for fresh catalyst centered at 133 °C (Figure A), in contrast to a sharper peak centered at 173 °C after accelerated aging (Figure B). The sharper peak observed after aging suggests that the oxygen affinity on Pt–Ru particles are stronger, thus the chemisorbed oxygen reacts with hydrogen in a narrow temperature range.…”

Section: Resultsmentioning

confidence: 98%

Highly Durable Pt–Ru-Doped Ce_0.9Zr_0.1O₂ as an Effective Dual Catalyst for Low-Temperature Simultaneous Propane and Carbon Monoxide Oxidation

et al. 2022

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The demand for a dual catalyst that maintains high catalytic performance at low temperatures for simultaneous propane and carbon monoxide (CO) oxidation with repeated usage is significant, yet lacking in the literature. Here, we report a mesoporous platinum–ruthenium (0.5 wt % Pt and 0.5 wt % Ru)-doped ceria–zirconia bifunctional catalyst achieving T 95 at ∼260 °C and T 100 below 300 °C for propane oxidation, along with simultaneous 100% CO conversion at ∼200 °C. The performance is maintained after accelerated aging at 1000 °C for 24 h. The consistent superior performance over prolonged cycling is multifaceted, contributed by an optimal balance among nanostructure, metal oxide support/metal dopant system, and composition. The ceria–zirconia support gives enhanced oxygen storage and release capabilities coupled with thermal endurance. The porous catalyst has numerous catalytic sites with short reaction paths doped with Pt–Ru nanoparticles, leading to increased efficiency in bond cleavage for propane and endowing CO tolerance. Nanosized particles with narrow size distribution and uniform metal dispersion are effective in promoting catalytic activity toward oxidation reactions at low temperatures. This catalyst is thermally stable, durable, and active toward propane oxidation, and its catalytic performance is not compromised by the simultaneous presence of CO.

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EXAFS Peaks and TPR Characterizing Bimetallic Interactions: Effects of Impregnation Methods on the Structure of Pt-Ru/C Catalysts

Cited by 6 publications

References 69 publications

Hydrodeoxygenation of Isoeugenol over Carbon-Supported Pt and Pt–Re Catalysts for Production of Renewable Jet Fuel

Hydrodeoxygenation of Isoeugenol over Carbon-Supported Pt and Pt–Re Catalysts for Production of Renewable Jet Fuel

Bifunctional Pt–Re Catalysts in Hydrodeoxygenation of Isoeugenol as a Model Compound for Renewable Jet Fuel Production

Highly Durable Pt–Ru-Doped Ce_0.9Zr_0.1O₂ as an Effective Dual Catalyst for Low-Temperature Simultaneous Propane and Carbon Monoxide Oxidation

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EXAFS Peaks and TPR Characterizing Bimetallic Interactions: Effects of Impregnation Methods on the Structure of Pt-Ru/C Catalysts

Cited by 6 publications

References 69 publications

Hydrodeoxygenation of Isoeugenol over Carbon-Supported Pt and Pt–Re Catalysts for Production of Renewable Jet Fuel

Hydrodeoxygenation of Isoeugenol over Carbon-Supported Pt and Pt–Re Catalysts for Production of Renewable Jet Fuel

Bifunctional Pt–Re Catalysts in Hydrodeoxygenation of Isoeugenol as a Model Compound for Renewable Jet Fuel Production

Highly Durable Pt–Ru-Doped Ce0.9Zr0.1O2 as an Effective Dual Catalyst for Low-Temperature Simultaneous Propane and Carbon Monoxide Oxidation

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Highly Durable Pt–Ru-Doped Ce_0.9Zr_0.1O₂ as an Effective Dual Catalyst for Low-Temperature Simultaneous Propane and Carbon Monoxide Oxidation