Identifying the adsorbed active intermediates on Pt surface and promotion of activity through the redox CeO 2 in preferential oxidation of CO in H 2

Paz, Diego Silva; Damyanova, S.; Borges, Laís Reis; Santos, João Batista Oliveira dos; Bueno, J.M.C.

doi:10.1016/j.apcata.2017.08.012

Cited by 22 publications

(12 citation statements)

References 65 publications

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“…In addition, PRA exhibited two more peaks consuming hydrogen at 380 and 465 °C, respectively. It has been reported in ref ( 39 ) that a second peak consuming hydrogen for Pt/Al 2 O 3 can originate from reduction of Pt(OAl) 4 at 414 °C. On the other hand, the PRA catalyst exhibiting a Re/Pt mass ratio of 1.3 was dried at 110 °C, after which it was reduced at 400 °C.…”

Section: Resultsmentioning

confidence: 87%

Hydrodeoxygenation of Isoeugenol over Alumina-Supported Ir, Pt, and Re Catalysts

Alda-Onggar

Mäki‐Arvela

Eränen

et al. 2018

ACS Sustainable Chem. Eng.

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Hydrodeoxygenation (HDO) of isoeugenol (IE) was investigated using bimetallic iridium–rhenium and platinum–rhenium catalysts supported on alumina in the temperature and pressure ranges of 200–250 °C and 17–40 bar in nonpolar dodecane as a solvent. The main parameters were catalyst type, hydrogen pressure, and initial concentration. Nearly quantitative yield of the desired product, propylcyclohexane (PCH), at complete conversion in 240 min was obtained with Ir–Re/Al2O3 prepared by the deposition–precipitation method using 0.1 mol/L IE initial concentration. High iridium dispersion together with a modification effect of rhenium provided in situ formation of the IrRe active component with reproducible catalytic activity for selective HDO of IE to PCH. The reaction rate was shown to increase with the increasing initial IE concentration promoting also HDO and giving a higher liquid phase mass balance. Increasing hydrogen pressure benefits the PCH yield.

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Section: Resultsmentioning

confidence: 87%

Hydrodeoxygenation of Isoeugenol over Alumina-Supported Ir, Pt, and Re Catalysts

Alda-Onggar

Mäki‐Arvela

Eränen

et al. 2018

ACS Sustainable Chem. Eng.

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“…The changes in the Pt L 3edge induced by chemisorption of H, CO, and O could be determined by the Δμ XANES technique, where the reference spectrum was subtracted from the XANES spectra of the sample under the different atmospheres and temperatures, hence providing information about the adsorbate identity and the geometry of the binding sites. [65,69]…”

Section: Sample Characterizationmentioning

confidence: 99%

Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al₂O₃

et al. 2019

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The effects of promoters and additives on the electronic properties and structural properties of Pt catalysts still need to be understood. The present work investigates the effects of the Pt loading and the use of chloride additive on the structural properties of Pt/Al2O3 and its catalytic activity towards the WGS reaction. The presence of Cl affected the morphology and oxygen coverage of the Pt nanoparticles. However, these parameters did not affect the surface electronic properties, due to a compensation effect between the size of the Pt0 core and oxygen coordinated on the shell (NPt‐O). Despite the structural differences, the catalytic activity for the WGS reaction was similar for the chloride‐free sample and the catalyst containing chloride. The effect of the Pt loading was also studied, with the “apparent” catalytic activity per site of Pt (TOF) decreasing with increasing metal loading. Increasing the Pt loading led to an increase of the low‐coordination Pt0 sites at the surface of the NPs, resulting in stronger Pt‐CO integration and consequent poisoning of the active sites.

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“…Paz et al found that the addition of second metal cerium enhanced the interactions between Pt 0 and oxygen atoms. As a result, the bi-metal catalyst showed higher activity in the CO oxidation reaction even at lower reaction temperature compared with the non-promoted Pt catalysts [24]. Lu et al prepared a series of CeO 2 –Co 3 O 4 catalysts for the catalytic oxidation of formaldehyde (HCHO) [25].…”

Section: Introductionmentioning

confidence: 99%

Cerium promoted V-g-C ₃ N ₄ as highly efficient heterogeneous catalysts for the direct benzene hydroxylation

Wang¹,

Hu²,

Wang³

et al. 2018

R. Soc. open sci.

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A series of Cex-V-g-C3N4 catalysts with different cerium content were synthesized by a facile co-assembly method. Compared with pure V-g-C3N4 catalyst, the addition of cerium facilitated the high dispersion of vanadium species as well as the benzene adsorption ability of the corresponding catalysts. Also, the existence of cerium promoted the partial reduction of vanadium species, which improved the redox property of vanadium species as the active centres. The Cex-V-g-C3N4 catalysts showed considerably improved activity in the benzene hydroxylation reaction compared with V-g-C3N4 catalyst. Among the catalysts studied, Ce0.07-0.07 V-g-C3N4 exhibited the best catalytic activity with a benzene conversion of 33.7% and a phenol yield of 32.3% with good structural and catalytic stability, while only 24.7% of benzene conversion and phenol yield of 24.2% were obtained over 0.07 V-g-C3N4.

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Identifying the adsorbed active intermediates on Pt surface and promotion of activity through the redox CeO 2 in preferential oxidation of CO in H 2

Cited by 22 publications

References 65 publications

Hydrodeoxygenation of Isoeugenol over Alumina-Supported Ir, Pt, and Re Catalysts

Hydrodeoxygenation of Isoeugenol over Alumina-Supported Ir, Pt, and Re Catalysts

Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al₂O₃

Cerium promoted V-g-C ₃ N ₄ as highly efficient heterogeneous catalysts for the direct benzene hydroxylation

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Identifying the adsorbed active intermediates on Pt surface and promotion of activity through the redox CeO 2 in preferential oxidation of CO in H 2

Cited by 22 publications

References 65 publications

Hydrodeoxygenation of Isoeugenol over Alumina-Supported Ir, Pt, and Re Catalysts

Hydrodeoxygenation of Isoeugenol over Alumina-Supported Ir, Pt, and Re Catalysts

Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al2O3

Cerium promoted V-g-C 3 N 4 as highly efficient heterogeneous catalysts for the direct benzene hydroxylation

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Product

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About

Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al₂O₃

Cerium promoted V-g-C ₃ N ₄ as highly efficient heterogeneous catalysts for the direct benzene hydroxylation