Using angle-resolved photoemission spectroscopy, we show direct evidence for charge transfer between adsorbed molecules and metal substrates, i.e., chemisorption of CO on Pt(111) and Pt–Sn/Pt(111) 2 × 2 surfaces. The observed band structures show a unique signature of charge transfer as CO atoms are adsorbed, revealing the roles of specific …

Catalyst deactivation by coking is one major problem for propane dehydrogenation (PDH). To develop catalysts with high resistance to coke, the analysis of coke becomes essential. In this work, an analysis procedure is proposed and validated to acquire the detailed locations and compositions of the coke formed on an as-synthesized …

These results indicate that the excessive addition of K weakens the interactions between Sn species and ZSM-5 carrier obviously, thus making the reduction of Sn species to form Sn 0 easily. According to Tasbihi et al., the addition of K and Sn to Pt led to a direct interaction between these metals. Therefore, it can be concluded that the ...

The analysis of Bader charges in Pt–Sn nanoalloys revealed a strong correlation between the charge and the coordination number of Sn atoms with respect to Pt neighbors. In particular, the magnitude of the charge transfer from Sn to Pt increases as a function of the Sn coordination number. ... (111) terrace positions were 1165, 867 and …

Glycerol is an alternative sustainable fuel for fuel cells, and efficient electrocatalyst is crucial for glycerol oxidation reaction (GOR). The promising Pt catalysts are subject to the inadequate capability of C–C bond cleavage and the susceptibility to poisoning. Herein, Pt-Sn alloyed nanoparticles are immobilized on hierarchical nitrogen …

With a fully automated high temperature calorimeter the enthalpy of formation of the [Pt–Sn] liquid system was determined on the molar fraction range 0< x <0.72 (with …

Nature Materials - Highly stable and active Pt–Sn sub-nanometre clusters are located in sinusoidal zeolite channels, leading …

The PtSn/Al 2 O 3 is a prototypical industrial catalyst for propane dehydrogenation (PDH). However, the local structures of the active sites are still inconclusive under the operation conditions. Herein, the evolutions of the Pt-Sn active centers supported on nano-Al 2 O 3 are definitely discerned at the atomic level during …

Pt–Sn/ZnAl 2 O 4 showed much better catalytic stability than Pt–Sn/Al 2 O 3. Pt–Sn alloys over Pt–Sn catalysts were unstable during the reaction. PtSn on ZnAl 2 O …

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Monometallic Pt and bimetallic Pt-Sn catalysts were prepared by incipient wetness impregnation. Impregnation solutions were prepared by dissolving appropriate amounts of Pt(NH 3) 4 (NO 3) 2 (Johnson-Matthey/Aesar) and SnCl 2 ·2H 2 O (Merck, 98–) in double deionised water. The resulting solution was added dropwise to the …

The catalytic performance of PtSnZn/Al2O3 is also significantly higher than that of Pt/Al2O3, PtSn/Al2O3, and PtZn/Al2O3. Experiments and theoretical calculations indicate that the Sn 5p and Zn 4s orbitals are hybridized with Pt 5d by forming Pt−Sn and Pt−Zn pairs, which leads to the d band center of Pt deviating from Fermi level (−2.81 eV).

Ethanol is a kind of green and sustainable liquid fuel with high energy density, which has a promising application prospect in liquid fuel cells. Improving the anti-poisoning ability and C–C bond cleavage ability of Pt-based catalysts is critical for achieving efficient ethanol oxidation reaction. Here, Pt–Sn nanosheets preferentially exposed with …

Phys. Rev. B 108, 224406 (2023) - Giant interfacial spin-orbit ...

Three different synthesis procedures (Pt calcination (PC), co-calcination (CC) and direct reduction (DR)) were performed and examined for catalytic …

However, due to its high SN for VT, its overall accuracy was similar to those of the other algorithms. The original report stated SP and SN values of 96 and 64%, respectively, 6 whereas the present values were lower. Similarly, Lau et al. 10 reported a lower SP for this algorithm (44%) than originally described.

Latin America. Asia Pacific. KRATON® D1165 PT Polymer is a clear, linear triblock copolymer based on styrene and isoprene with a polystyrene content of 30%. It is …

The Pt@Sn core–shell structure was generated in MWW zeolite catalysts prepared by atom-planting incorporated Sn and deposition–precipitation (DP) loaded Pt for direct dehydrogenation of ethane or propane and CO 2 oxidative dehydrogenation. The introduced Sn species can immobilize cubic structure Pt nanoparticle with well dispersed …

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Pt–Sn bimetallic nanoparticles (BMNPs) are used in a variety of catalytic reactions and are widely accepted as a model system for Pt-based bimetallics in fundamental catalysis research. Here, Pt–Sn BMNPs were prepared via a two-step synthesis procedure combining atomic layer deposition (ALD) and temperature program

The structure–catalytic property relationships of Al2O3-supported Pt–Sn nanoparticles (Pt–Sn/Al2O3) in the dehydrogenation of methylcyclohexane (MCH) were investigated by varying the Sn/Pt ratios of the catalysts. The initial activity and the deactivation rate of the Pt–Sn/Al2O3 catalysts in the MCH dehydrogenation decreased in line with an increase …

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The bright field TEM images displayed in Fig. 1 show the distribution of NPs on the silica support. The mean particle sizes of the Pt/SiO 2 and Pt–Sn/SiO 2 catalysts are summarized in Table 1.The data shows that the oxidative atmosphere led to poor Pt dispersion on Pt/SiO 2 catalysts. Large NPs (∼26 nm) were observed, whose particle …

Seven Pt–Sn bimetallic NPs samples were prepared with a Sn/Pt molar ratio of 0, 1:12, 1:9, 1:6, 1:3, 1:1, and 2:1 using LiB(C 2 H 5) 3 H as the reducing agent, Bu 3 …

The reactivity of SiO 2 - and Al 2 O 3-supported Pt and Pt-Sn catalysts for propane dehydrogenation is affected by the strength of interaction of Sn with Pt relative …

This paper describes the structure evolution of Pt-Sn bimetallic nanoparticles for catalytic dehydrogenation, especially Sn segregation for surface recovery of a Pt-Sn alloy. An acid etching-reduction process was adopted to investigate the migration of Sn atoms after surface Sn species loss. By acid etching, Sn atoms at the surface of Pt-Sn ...

Propane dehydrogenation on Pt–Sn/Al 2 O 3 and Pt–Sn/ZnAl 2 O 4 was performed, and the Pt–Sn/ZnAl 2 O 4 catalyst showed a stronger tolerance for catalytic deactivation than the Pt–Sn/Al 2 O 3 catalyst. In this study, we propose that the high catalytic stability of Pt–Sn/ZnAl 2 O 4 originates from the relatively faster coke mobility …