The Effect of Coating TiO2 on the CO Oxidation of the Pt/γ-Alumina Catalysts

Resende, Neuman Solange de; Perez, Carlos A.; Eon, Jean‐Guillaume; Schmal, Martín

doi:10.1007/s10562-011-0695-y

Cited by 27 publications

(19 citation statements)

References 36 publications

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“…For 40Ti-( Ph PCP)Pt-Al 2 O 3 -400 cal, a peak at 2110 cm –1 is observed and a smaller peak is observed at the region assigned to reduced Pt nanoparticles (<2100 cm –1 ). The peak at 2110 cm –1 is indicative of an oxidized Pt species on TiO 2 and is thus assigned to the Pt single-atom species . This is in agreement with the HAADF-STEM data, where very few Pt nanoparticles are observed.…”

Section: Resultssupporting

confidence: 88%

“…Because Pt 4d 5/2 binding energies due to Pt 0 species are commonly observed as high as 314.7 eV, this peak is assigned to the intact supported Pt 2+ organometallic. For bare calcined ( Ph PCP)Pt-Al 2 O 3 -400 cal, features at 314.0 eV (70%) and 318.6 eV (30%) are observed and can be assigned to reduced Pt and oxidized Pt species, respectively. ,− On the basis of the intensity profiles, it is apparent that Pt 0 dominates on the bare material, indicating a preponderance of nanoparticle Pt species. For 20Al-( Ph PCP)Pt-Al 2 O 3 -400 cal, peaks at 317.0 eV (42%) and 313.9 eV (58%) are apparent and similarly assigned.…”

Section: Resultsmentioning

confidence: 99%

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Stabilizing Single-Atom and Small-Domain Platinum via Combining Organometallic Chemisorption and Atomic Layer Deposition

Liu¹,

Tan²,

Güleç³

et al. 2017

Organometallics

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Oxide-supported single-atom Pt materials are prepared by combining surface organometallic chemisorption with atomic layer deposition (ALD). Here Pt is supported as a discrete monatomic "pincer" complex, stabilized by an atomic layer deposition (ALD) derived oxide overcoat, and then calcined at 400 °C under O 2 . ALD-derived Al 2 O 3 , TiO 2 , and ZnO overlayers are effective in suppressing Pt sintering and significantly stabilizing single Pt atoms. Furthermore, this procedure decreases the overall Pt nuclearity (∼1 nm average particle diameter) versus bare Pt (∼3.8 nm average diameter), as assayed by aberration corrected HAADF-STEM. The TiO 2 and ZnO overcoats are significantly more effective at stabilizing single-atom Pt species and decreasing the overall Pt nuclearity than Al 2 O 3 overcoats. Vibrational spectroscopy of adsorbed CO also shows that oxidized Pt species commonly thought to be single Pt atoms are inactive for catalytic oxidation of adsorbed CO. CO chemisorption measurements show site blockage by the ALD overcoats.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Stabilizing Single-Atom and Small-Domain Platinum via Combining Organometallic Chemisorption and Atomic Layer Deposition

Liu¹,

Tan²,

Güleç³

et al. 2017

Organometallics

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“…The binding energy at 72.3–76.0 eV can be indicated as PtO on the surface (18.9%). [ 34 ] The other peaks pointed the formation of some other oxidized platinum species (28.8%). To gain more insight into the nature of active species, the surface compositions after reaction was also evaluated by XPS analyses for region of P2p.…”

Section: Resultsmentioning

confidence: 99%

The two faces of platinum hydrospirophosphorane complexes—Not only relevant catalysts but cytotoxic compounds as well

Skarżyńska

Kowalczyk

Majchrzak

et al. 2021

Applied Organom Chemis

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Platinum complexes [PtCl2(L)] L = L1, L2 with symmetrical HP (OCH2CMe2NH)2 (L1) and unsymmetrical HP(OCMe2CMe2O)(OCH2CMe2NH) (L2) hydrospirophosphorane (HSP) ligands were demonstrated to play a dual role of catalysts and cytotoxic compounds as well. The structure of new complex [PtCl2(L2)] was confirmed by physicochemical and spectroscopic methods, as well as single X‐ray diffraction studies for [PtCl2{P (OCMe2CMe2O)(OCH2CMe2NH2)}]. HSP ligand coordinated to the platinum center in bidentate κ2‐P,NH2 chelating mode of fashion. Both complexes were found to exhibit catalytic activity for Heck cross‐coupling reactions of iodobenzene with substituted styrenes, with good conversion and yield of stilbenes. Moreover, complexes have been applied as excellent catalysts for highly regioselective hydrosilylation of aromatic and aliphatic terminal olefins, and acetylenes terminal and internal as well. On the other hand, the preliminary biological studies revealed that in the presence of foretinib, drug candidate in clinical trials for the treatment of cancer, platinum complexes revealed increased synergistic effect and efficiently decreased the number of viable cells of triple negative breast cancer MDA‐MB‐231 cell line.

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“…Therefore, the Pt 4d lines analyzed for both the hydrogen reduced and NaBH 4 reduced catalyst are shown in Figure 4c,d. Pt(II) and PtO were found at 316.5 eV and 317.3 eV for the NaBH 4 reduced catalyst [30,35], whereas Pt species were completely reduced to zero valent platinum in hydrogen reduced catalyst at a binding energy of 313 eV [36]. A slight shift in binding energies for Pt(O) and Pt(II) peaks was observed, compared with monometallic Pt.…”

Section: Xps Analysismentioning

confidence: 90%

Effect of Reduction of Pt–Sn/α-Al2O3 on Catalytic Dehydrogenation of Mixed-Paraffin Feed

Kanniappan

Ragula

2020

Catalysts

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The effect of the Pt–Sn/α-Al2O3 catalyst reduction method on dehydrogenation of mixed-light paraffins to olefins has been studied in this work. Pt–Sn/α-Al2O3 catalysts were prepared by two different methods: (a) liquid phase reduction with NaBH4 and (b) gas phase reduction with hydrogen. The catalytic performance of these two catalysts for dehydrogenation of paraffins was compared. Also, the synergy between the catalyst reduction method and mixed-paraffin feed (against individual paraffin feed) was studied. The catalysts were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) analysis. The individual and mixed-paraffin feed dehydrogenation experiments were carried out in a packed bed reactor fabricated from Inconel 600, operating at 600 °C and 10 psi pressure. The dehydrogenation products were analyzed using an online gas chromatograph (GC) with flame ionization detector (FID). The total paraffin conversion and olefin selectivity for individual paraffin feed (propane only and butane only) and mixed-paraffin feed were compared. The conversion of propane only feed was found to be 10.7% and 9.9%, with olefin selectivity of 499% and 490% for NaBH4 and hydrogen reduced catalysts, respectively. The conversion of butane only feed was found to be 24.4% and 23.3%, with olefin selectivity of 405% and 418% for NaBH4 and hydrogen reduced catalysts, respectively. The conversion of propane and butane during mixed-feed dehydrogenation was measured to be 21.4% and 30.6% for the NaBH4 reduced catalyst, and 17.2%, 22.4% for the hydrogen reduced catalyst, respectively. The olefin selectivity was 422% and 415% for NaBH4 and hydrogen reduced catalysts, respectively. The conversions of propane and butane for mixed-paraffin feed were found to be higher when compared with individual paraffin dehydrogenation. The thermogravimetric studies of used catalysts under oxygen atmosphere showed that the amount of coke deposited during mixed-paraffin feed is less compared with individual paraffin feed for both catalysts. The study showed NaBH4 as a simple and promising alternative reduction method for the synthesis of Pt–Sn/Al2O3 catalyst for paraffin dehydrogenation. Further, the studies revealed that mixed-paraffin feed dehydrogenation gave higher conversions without significantly affecting olefin selectivity.

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The Effect of Coating TiO2 on the CO Oxidation of the Pt/γ-Alumina Catalysts

Cited by 27 publications

References 36 publications

Stabilizing Single-Atom and Small-Domain Platinum via Combining Organometallic Chemisorption and Atomic Layer Deposition

Stabilizing Single-Atom and Small-Domain Platinum via Combining Organometallic Chemisorption and Atomic Layer Deposition

The two faces of platinum hydrospirophosphorane complexes—Not only relevant catalysts but cytotoxic compounds as well

Effect of Reduction of Pt–Sn/α-Al2O3 on Catalytic Dehydrogenation of Mixed-Paraffin Feed

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