chốt 1165 pt sn

119Sn Möss spectroscopy of the time-resolved

We began by collecting Mӧss reference spectra for the as-received tin chlorides, crystalline SnCl 4 ·5H 2 O and crystalline SnCl 2 ·2H 2 O, and the same starting materials dissolved in 7.5 M HCl (the electrolyte solution used for the synthesis of the Pt nanoparticles). High concentrations of HCl at acidic pH have previously been …

Stability of Pt

The O adsorption energy on the Pt top site (−182 kJ.mol −1) with a Pt−O bond length of 1.79 Å is twice stronger than that on the Sn top site (−85 kJ.mol −1) with a Sn−O bond length of 1.87 Å.This result which does not follow the intuitive expectation based on electronegativity of Pt and Sn elements, highlights that the specific behavior of such …

Effects of Synthesis Procedures on Pt–Sn Alloy …

In order to investigate the local structure of active catalysts (Pt–Sn/SiO2-PC, Pt–Sn/SiO2-DR) and be certain of relevant preparation processes, we also performed the XAS …

Enthalpy of formation of the (Pt–Sn) system

The experimental results, i.e. enthalpies of formation of liquid, solid and two-phase alloys are presented in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6.They exhibit a very strong interaction in (Pt–Sn) alloys (all values of Δ mix H m ° are very negative). At the start of a series (x Pt =0) a liquid phase is formed.The occurrence of a breakpoint in the enthalpy …

Stable and selective catalysts for propane …

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. …

PtSnP/C and PtSn/C as efficient cathode catalysts for oxygen …

This study focused on reducing the catalyst cost and improving the performance of cathode in single chamber microbial fuel cell (SCMFC). Cost-effective Pt 7 Sn 3 P/C and PtSn (with different Pt/Sn atomic ratios) catalysts were investigated for the oxygen reduction reaction (ORR) in SCMFCs with air cathode. The morphology, surface …

Dendritic Mesoporous Silica Nanoparticle Supported PtSn …

The influences of Pt/Sn ratios were investigated. Changing the Pt/Sn ratios influences the interaction between Pt and Sn. The catalyst with a Pt/Sn ratio of 1:2 possesses the highest interaction between Pt and Sn. The best catalytic performance was obtained for the Pt 1 Sn 2 /DMSN catalyst with an initial propane conversion of 34.9%. The good ...

Design of Highly Efficient Pt-SnO2 Hydrogenation …

Download PDF. back. In this work, Pt-SnO2 heteroaggregate nanocatalysts were synthesized by in situ transformation of Pt@Sn core–shell nanoparticles and their …

Fabrication of Pt, Pt–Cu, and Pt–Sn nanofibers for

Poly(vinyl pyrrolidone) with a M w of 1.3 × 106 g/mol (PVP) or 4 × 104 g/mol (PVPLow) was used as a polymer to fabricate PVP–Pt, PVP–Pt–Cu, and PVPLow–Pt–Sn composite fibers by electrospinning. The effect of varying the electrospinning conditions on the fiber morphology was investigated, and the solution composition and electrospinning …

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Atomic Ordering and Sn Segregation in Pt–Sn …

Additionally, we found that atomic ordering in Pt–Sn nanoalloys is driven by the balance between the surface segregation energy of Sn atoms and the energy of …

Catalytic properties of intermetallic platinum-tin nanoparticles with

The TOFs of these Pt-Sn iNPs in furfural hydrogenation were also calculated as shown in Fig. S8. The Pt-Sn iNPs have 2 to 7-fold higher TOFs than pure Pt exemplifying the promotion effect of bimetallic Pt-Sn in furfural hydrogenation. The Pt-rich Pt 1.2 Sn catalysts have similar TOFs (0.20 s −1) regardless of the reduction temperatures.

Effect of tin content on TiO2-supported platinum-tin …

The Pt-Sn bimetallic catalyst (PtSn0.25/T) prepared with 0.25 wt% tin, followed by H 2 pre-treatment, demonstrated beneficial properties in terms of CO chemisorption and O 2 dissociative adsorption. Theoretical investigation for the adsorption behavior of the reactant on Pt/TiO 2 and PtSn/TiO 2 was in line with the experimental …

Catalysts | Free Full-Text | Pt-Sn Supported on …

With the growing global propylene demand, propane dehydrogenation (PDH) has attracted great attention for on-purpose propylene production. However, its industrial application is limited …

Influence of support on the catalytic properties of …

Pt–Sn–K/q-Al2O3 for propane dehydrogenation† Yu Shi, ab Xianru Li,ab Xin Rong,ab Bin Gu,ab Huangzhao Weia and Chenglin Sun*a A study on the performance of Pt(0.3 wt%)Sn(0.2 wt%)K(0.5 wt%) catalysts supported on four different q-Al 2O 3 for propane dehydrogenation is reported in this study. The q-Al 2O 3 used as supports were

Frontiers | Pt-Sn alloy shells with tunable composition and …

Combining the core-shell structure with the optimization of surface composition and structure in the shell is a fantastic strategy to enhance the electrocatalytic performances. Here, we synthesized trimetallic Au@PtxSny core-shell nanoparticles (NPs) with tunable composition and structure of Pt-Sn alloyed shells. Impressively, the …

Stable and selective catalysts for propane …

We report that silica-supported platinum-tin (Pt 1 Sn 1) nanoparticles (<2 nanometers in diameter) can operate as a PDH catalyst at thermodynamically limited …

Structural modulation and direct measurement of …

Characterization of PtSn clusters in MFI zeolite. Initially, a K-PtSn@MFI-Air sample (containing 0.4 wt% Pt, 0.9 wt% Sn and 0.6 wt% K) was prepared by a one-pot synthesis according to our ...

Atomic Ordering and Sn Segregation in Pt–Sn Nanoalloys

The stability and atomic ordering in Pt–Sn nanoalloys supported on CeO2 thin films have been studied by means of synchrotron radiation photoelectron spectroscopy and density functional calculations. Using CO molecules as a probe, we explored the development of the surface structure of supported Pt–Sn nanoalloys with respect to a …

Thermally Stable and Regenerable Platinum–Tin …

The Pt–Sn/CeO 2 catalyst was also tested in a second reactor setup for propane dehydrogenation at reaction temperatures of 550 and 680 °C to verify the stability and carbon balance, and the results show that in …

Pt–Sn alloy phases and coke mobility over Pt–Sn/Al

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 …

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Single-atom alloy catalysts: structural analysis, electronic …

Based on the FT-EXAFS spectra in Fig. 7, it was determined that the sample reduced at 400 °C (Pt 1 /ATO) showed Pt–Sn interactions, while both Pt/C and the sample reduced at 100 °C (Pt NP/ATO) only showed Pt–Pt bonds. Furthermore, the Pt–Sn CN was determined to be 2.61 for the sample reduced at 400 °C and no Pt–Pt bonding was …

New strategy of S,N co-doping of conductive-copolymer …

Remarkably, the Pt 1 Cu 2 /SN-MWCNTs show an obviously larger electroactive surface area and higher mass activity, stability, and CO poisoning resistance in methanol oxidation compared to Pt/SN-MWCNTs, Pt/S-MWCNTs, Pt/N-MWCNTs, and commercial Pt/C. Density functional theory studies confirm that the co-doping of S and N …

Sn surface-enriched Pt–Sn bimetallic nanoparticles as a …

The presence of Bu 3 SnH during the synthesis has a significant effect on the Pt NPs crystallization process. The THF solution turned to black instantly when the synthesis was performed at low Sn/Pt molar ratio, and the Pt NPs started to precipitate from THF in 10 min (Fig. S1).When the Sn/Pt ratio was increased to 1, a step-wise color …

Preparation of highly dispersed Pt–Sn/Al

An increase in the Sn/Pt ratio will further reduce the particle size of Pt and increase its dispersion. When the Sn/Pt ratio is 1.5, it shows the best catalytic activity. The metal …

Propane dehydrogenation over supported Pt and Pt-Sn …

Pt and Pt-Sn catalysts supported on SiO{sub 2} and {gamma}-Al{sub 2}O{sub 3} and prepared by impregnation have been studied by temperature-programmed reduction (TPR), hydrogen chemisorption, temperature-programmed desorption (TPD), and catalytic dehydrogenation of propane. Without the promoter Pt shows the same initial specific …

Đề tài: Tính Toán –Kết Cấu Động Cơ Đốt Trong, HAY, 9đ | PDF

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A Comprehensive Study of Coke Deposits on a Pt-Sn/SBA …

Catalytic propane dehydrogenation is an attractive method to produce propylene while avoiding the issues of its traditional synthesis via naphtha steam cracking of naphtha. In this contribution, a series of Pt-Sn/SBA-16 catalysts were synthesized and evaluated for this purpose. Bimetallic Pt-Sn catalysts were more active than catalysts …

Petroleum Science and Technology

After reduction, the crystallite size for Pt-Sn/kaolinite catalyst was sharply decreased due to possible electron modification of Sn modifying the Pt surface when the …

The effect of Ce, Zn and Co on Pt-based catalysts in propane

The effect of the addition of different promoters, such as, Ce, Zn and Co (0.3, 0.5 and 0.7 wt%) to the trimetallic Pt–Sn–K/Al2O3 catalyst in order to enhance performance of propane dehydrogenation was investigated and characterized with several analytic techniques, including, TPR, XRF, UV analysis, SEM and TGA–DTA. The catalysts were …

Silica-supported, narrowly distributed, subnanometric …

the industrial Pt–Sn/Al 2O 3 catalyst. In all cases, a combination of Pt with a second metal (In, Sn, Ga, Cu, Zn, etc.) bene cially in uenced the catalyst performance as compared to mono-metallic Pt catalysts.4–9 While the selectivity for most of the systems reaches high levels, all of them suffer from deactiva-tion.

Growth of phases in the solid-state from room temperature …

The solid-state growth of the product phases in bulk and electroplated diffusion couples of the Pd–Sn and the Pt–Sn systems is reported at various temperatures, ranging from room temperature to 215 °C. The growth rate of the product phase in the Pt–Sn system is found to be much lower compared to the Pd–Sn system and the Au–Sn …

PT, PTT, and INR Blood Tests: Purpose and Normal Ranges

With the PTT test, the reference range is between 25 and 33 seconds. As with the PT test, a higher PTT number means your blood is taking longer than usual to clot. A lower PTT number means that your blood is clotting faster than normal. There are several reasons why this might occur. Clotting Too Quickly.

Sn 1 Pt single-atom alloy evolved stable PtSn/nano-Al 2 O 3 …

Our findings depict an unprecedented evolution process of the active sites of the PtSn/Al 2 O 3, and afford an effectual nanostructure engineering pathway for stable PDH catalysts. …

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Structure‐Activity Relationships in Highly Active …

Pt/Sn-containing MFI zeolites prepared by one-pot hydro-thermal methods are highly active and selective catalysts for propane dehydrogenation. An alternative preparation method is reported alongside an in-depth characterization of Pt and Sn before and after reaction. Pt species dispersed on highly-