Synthesis of Pt–Sn nanoalloy catalysts with enhanced …
Abstract. Platinum–tin (Pt–Sn) nanoalloy catalyst supported on Al 2 O 3 was prepared by carbonylation–impregnation method. The catalyst was characterised by …
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Effect of alumina support on catalytic performance of Pt-Sn/Al
Abstract: The effect of alumina on the catalytic performance of Pt-Sn/Al 2 O 3 catalysts in the green synthesis of secondary amines by N-alkylation of amines with alcohols based on the borrowing hydrogen strategy was investigated. N-alkylation of aniline with benzyl alcohol to produce N-phenylbenzylamine was used as a model reaction.Three different alumina …
Pt–Sn alloy phases and coke mobility over …
In this study, we propose that the high catalytic stability of Pt–Sn/ZnAl2O4originates from the relatively faster coke mobility from the metal surface …
Single-Metal-Encapsulated Double-Cage [Pt@Sn
Group 14 endohedral clusters containing a metal center inside usually possess a single cage topological structure, but here an unexpected single-metal-filled double-cage cluster, [Pt@Sn 17] 4− (1 a) is reported.It can be seen as a combination of the more extended Pt-filled [Pt@Sn 9] cage and hollow [Sn 9] cage sharing a central Sn …
Understanding the Role of Electronic Effects in CO on the Pt–Sn …
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 …
Size- and composition-controlled Pt–Sn bimetallic nanoparticles
Introduction Pt–Sn bimetallic catalysts are highly performant in a variety of catalytic reactions, including (de)hydrogenation and oxidation of hydrocarbons. 1 In industry, for example, they are used worldwide in the Oleflex (UOP) process for the on-purpose production of propylene. 2 Besides their wide applicability, Pt–Sn catalysts have become …
Single-atom catalysis of CO oxidation using Pt1/FeOx
This single-atom catalyst has extremely high atom efficiency and shows excellent stability and high activity for both CO oxidation and preferential oxidation of CO in H2. Density functional theory calculations show that the high catalytic activity correlates with the partially vacant 5d orbitals of the positively charged, high-valent Pt atoms ...
Staging & Grade
A physician who specializes in surgical treatment (removal) of cancer. A measure of how much a cancer has grown and/or spread in the body (i.e., how advanced a cancer is). The most common staging system is the. The process of surgically removing the to evaluate them for cancer.
Size- and composition-controlled Pt–Sn bimetallic …
Abstract. 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 …
Ru-Sn/AC for the Aqueous-Phase Reduction of Succinic Acid …
Initially, powder Ru-Sn catalysts were screened to determine the most effective bimetallic ratio and provide a comparison to other monometallic (Pd, Pt, Ru) and bimetallic (Pt-Sn, Pd-Re) catalysts. Batch reactor tests determined that a ∼1:1 metal weight ratio of Ru to Sn was effective for producing BDO in high yields, with complete conversion ...
Surface Hexagonal Pt1Sn1 Intermetallic on Pt …
layers containing an adsorbate are relaxed. Pt 1 Sn 1 (110) means Pt 1 Sn 1 full-body intermetallic, and Pt 1 Sn 1 (110) was modeled by a p(2 × 2) super cell and contained three layers, in which the top two layers are allowed to relax. Pt 1 Sn 1 (110)/Pt(111) was considered a Pt 1 Sn 1 shell on top of Pt with a single layer of Pt 1 Sn 1. The ...
Interlocutory Appeal: Everything You Need to Know
Interlocutory appeals can stop cases in their tracks if a court chooses to take the issue up. In a so-called plenary appeals process, a final judgement in a case takes place, and a jury or judge issues a ruling against you. To get a judgement revised, you need to submit an appeal notice to the court in 10 to 20 days, but this would depend on ...
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Westinghouse
Introducing Westinghouse's Revolutionary Line of Electric Power Washers. When it comes to keeping your outdoor spaces clean and pristine, Westinghouse has always been a name you can trust. With a rich... As the company that brought power to America over 100 years ago, we strive to improve everyday life with trustworthy innovation that brings ...
Intermetallic compounds M2Pt (M = Al, Ga, In, Sn) in the …
Pt-based intermetallic compounds M 2 Pt with anti-CaF 2 type of crystal structure and counterpart elements (M) from groups 13 (Al, Ga, In) and 14 (Sn) were studied as electrocatalysts for the oxygen evolution reaction (OER) in acidic media. Polar covalent bonding M–Pt with substantial charge transfer makes the difference between M 2 Pt and …
Elucidating strong metal-support interactions in Pt–Sn/SiO2
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 …
Direct PtSn Alloy Formation by Pt Electrodeposition on Sn …
Since Pt deposits only on metallic Sn, an experiment was designed to identify the potential at which Sn oxide formation takes place on the surface of the electrode. First of all, a CV, terminating ...
Pt–Sn alloy phases and coke mobility over Pt–Sn/Al2O3 and 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 …
Controllable synthesis of platinum–tin intermetallic …
This article proposes a general approach for the preparation of intermetallic nanoparticles of Pt 3 Sn, PtSn, PtSn 2, and PtSn 4, triggered by hexamethyldisilazane (HMDS) in conjunction with SnCl 2.The ethanol oxidation reaction (EOR) tests demonstrate the improved specific activity of Pt x Sn y intermetallic nanoparticles (Pt x Sn y), due to the …
Structural modulation and direct measurement of …
The amounts of Pt, Sn and K in the final product were ~0.4, ~0.9 and ~0.6 wt%, respectively. After the hydrothermal process, the solid product was isolated by …
Stable and selective catalysts for propane dehydrogenation …
Relative to the Cr-based catalysts, Pt-based catalysts in which Pt nanoparticles (NPs) supported on Al 2 O 3 and modified by the addition of a post-transition metal such as tin (Sn) exhibit higher selectivity. Performance depends critically on forming intermetallic PtSn NPs that improve propylene selectivity and enhance stability by reducing the rate of …
Influence of support on the catalytic properties …
The interaction between metal Pt and Sn, the valence of Sn, the properties of the support and the inter-actions between metal and support strongly in uence the catalytic …
pT1a Stage Finding (Concept Id: C1711128)
A pathologic primary tumor TNM stage finding. The definition of pT1a stage finding depends on the particular type of cancer that it refers to; for example, for breast cancer, pT1a stage finding is defined as follows: cancer with tumor size more than 0.1 cm, but not more than 0.5 cm in greatest dimension; for lung cancer, pT1a stage finding is defined …
Thermodynamic reassessment of Au-Pt-Sn system
This study provides updated information on phase equilibrium structures and thermodynamics of the Au-Pt-Sn ternary system. The formation enthalpies of Au-Sn and Pt-Sn binary subsystems were ...
Pt/Sn Intermetallic, Core/Shell and Alloy …
Request PDF | Pt/Sn Intermetallic, Core/Shell and Alloy Nanoparticles: Colloidal Synthesis and Structural Control | For the first time, shape-controlled Pt3Sn, …
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