Exafs pt-o

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August undefined, 2024

WebJul 25, 2002 · On the Cl-free oxidation catalyst, Pt-Pt and Pt-O bonds were detected using EXAFS, suggesting that the reduced metal particles are not fully oxidized under the … WebMay 21, 2015 · EXAFS spectra demonstrated that Pt sorbed on bacterial cells has a fourfold coordination of chlorine ions, similar to PtCl42-, which indicated that sorption on the protonated amine groups of the bacterial …

EXAFS - Theory - Chemistry LibreTexts

WebApr 13, 2024 · One is the conventional local JT distortion, as suggested by previous EXAFS studies of LiNiO 2 28,29, with four short Ni-O (~1.920 Å) and two long Ni-O (~2.069 Å) bonds in the [Ni III O 6 ... WebApr 5, 2001 · On the Cl-free catalyst, only Pt-Pt and Pt-O bonds were detected from the EXAFS results, while on the Cl-containing catalyst additional Pt-Cl bonds were present. The effect of chlorine on activity strongly depended on the reactant concentration. Exposure of the Cl-free catalyst to higher concentrations of methane (3 vol.% CH{sub 4}) reduced the ... link go scs limited

A feasibility study of “range-extended” EXAFS …

WebFeb 26, 2024 · This Pt SAC exhibits remarkable activity for oxidation of CO and hydrocarbons with 90% conversion at temperatures as low as ~160 o C under simulated … WebAug 11, 2024 · The EXAFS peak positions of H 2 O 2 -Pt/Ti–FS at the Ti K edge show a lack of changes, whereas they exhibit some changes in Pt/Ti–FS during heating from RT … WebAug 16, 2012 · 金属Pt是最有效的甲烷同系聚合催化剂，因此本工作以P灯MCM一1作为甲烷同系聚合反应的催化剂，通过制备一系列具有不同硅铝比和表面性质的MCM4 载体，研究载体性质对甲烷解离活化的能力和对C2+高碳烃生成的催化活性及产物选择性的影响，以此寻求 … link google tag manager to google analytics

In Situ High-Temperature Reaction-Induced Local Structural …

Dispersion and stability mechanism of Pt nanoparticles on …

WebEXAFS supplies information on local electronic states. I.e. It allows one to identify the nature of the bonds the target atom has to its neighbours and can thus give information the … Web2O) 3] +1, which, upon 24 h of aging, becomes [PtCl 2(OH) 2(H 2O) 2] 0 at pH 2.40 [3]. Fourier transforms of EXAFS spectra of 200-ppm Pt solutions at various pH values are shown in Fig. 1. The spectrum of CPA in HCl at a pH of 1.5 is characteristic of [PtCl 6]-2, while at a pH of 12 in NaOH, the average Pt coordination is 1.8 Pt-Cl and 4.2 Pt-O ... link gosund plug with alexaWebMar 2, 2024 · The x-ray absorption near-edge structure (XANES) spectra at Pt L 3-edge indicate that Pt species are presented as oxidation state in the SS Pt-RuO 2 HNSs . The Fourier transforms of Pt L 3-edge extended x-ray absorption fine structure (EXAFS) spectra reveal that the Pt-O interatomic distance of SS Pt-RuO 2 2 . The absence of Pt-Pt … link governor roles and responsibilities

"Web考虑到非金属杂原子的电子结构调节能力，通过杂原子掺杂以调控Ce单原子的局部配位微环境，有望带来ORR性能的重大突破。. 同时，精确调控杂原子配位RE基SACs的局部微环境，为进一步开发可靠的构效关系模型提供了新机遇。. 然而，由于稀土元素Ce与氧的强 ... " - Exafs pt-o

Exafs pt-o

EXAFS Study of Noble Metal Coordination Complexes in …

WebApr 10, 2024 · The I UV /I dark (O) of Pt–TiO 2 is the largest, as electrons are excited from O 2p to Ti 3d and then transfer to Pt, ... X.S. collected the Ti and O EXAFS data, and W.H. supervised the process ... WebSep 7, 2024 · Abstract. A feasibility study of a “range-extended” EXAFS measurement was conducted on the Pt L 3-edge of Pt/Al 2 O 3 in the presence of Au 2 O 3.The Pt L 3-edge EXAFS spectrum of the Pt/Al 2 O …

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WebSep 7, 2024 · In this paper, we evaluate the feasibility of the range-extended EXAFS technique to obtain a Pt L 3-edge EXAFS spectrum of Pt/Al 2 O 3 in the presence of Au, which has the L 3-edge X-ray absorption edge (11 … WebDec 12, 2024 · Both Fourier and wavelet transform indicated the dominant existence of single-atom Pt species on HAP. The fitting results of EXAFS are summarized in Figure S6 and Table S1. The coordination number of Pt–O for 0.2Pt 1 /HAP was 4.1, meaning that each Pt atom coordinates to approximately four oxygen atoms. The modification of 0.2Pt …

WebMar 20, 2024 · 同时，EXAFS拟合结果指出这种电子转移的产生是由于Pt-Ni直接化学键合。 DFT计算进一步证实了谱学表征结果，通过差分电荷密度模拟可以清晰观察到Pt与Ni之间的电荷重分布；这种界面电荷相互作用有效减弱了Pt (110)面上的氢吸附强度，从而促进了氢脱附 … WebFeb 10, 2000 · Abstract. The potential dependence of the extended X-ray absorption fine structure (EXAFS) obtained at the Pt L III absorption edge for a carbon supported Pt …

WebJan 30, 2008 · Abstract. We present the first structural determination of the Pt2 (P2O5H2)44– anion in solution by analyzing the extended X-ray absorption fine structure (EXAFS) spectrum of the Pt LIII edge ... WebInitialism of extended X-ray absorption fine structure ... Definition from Wiktionary, the free dictionary

WebApr 11, 2024 · 简而言之，EXAFS结果支持高度分散的Cu单原子在PtCu-TiO2中与Pt点部分耦合，而其他单原子Cu以Cu-O物种存在。图4c显示了电子顺磁共振光谱，其中Cu-TiO 2和PtCu-TiO 2表现出类似的强峰，归因于强度，Cu 2+的核自旋为3/2。

WebJan 30, 2024 · EXAFS corresponds to the oscillating part of the spectrum to the right of the absorption edge (appearing as a sudden, sharp peak), starting at roughly 50 eV and extending to about 1000 eV above the … link grabber chromeWebWe present the first structural determination of the Pt 2 (P 2 O 5 H 2) 44- anion in solution by analyzing the extended X-ray absorption fine structure (EXAFS) spectrum of the Pt L … linkgraph reviewsWebSep 21, 2014 · Shon等[39】用同步辐射（EXAFS）对Pt／Ti02催化剂研究认为，高温氢处理后H2和CO吸附能力的降低不是由于从载体发生大量电子转移造成的，而是由于更细微和特殊的电子结构变化，即在Pt金属簇和Ti02表面接触的地方，表面的一些Pt，O和Ti原子发生 … link gosund to alexaWebNov 27, 2024 · The nature of this effect will be clarified in the near future. The EXAFS Pt L 3-edge spectrum of the fresh Pt/Al 2 O 3 Figure 4 Al and Pt–Al scatterings of the oxide shell and the Pt–Pt scattering of the metallic core. According to the fit, the distance of Pt–O Al 2 O 3 catalysts, the coordination numbers for all scatterings (except the ... link grammarly to microsoft officeWebAnalysis of the extended X-ray absorption fine structure (EXAFS) spectra proved decoration and encapsulation of the Pt particles by the CeO 2 /Ce 2 O 3 support or a partial Ce–Pt … link gps carlaWebEXAFS is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms. EXAFS - What does EXAFS stand for? The Free … link gpo powershellWebWe present the first structural determination of the Pt 2 (P 2 O 5 H 2) 4 4-anion in solution by analyzing the extended X-ray absorption fine structure (EXAFS) spectrum of the Pt L III 2 (P 2 O 5 H 2) 4 4-anion in its ground state is required for future time-resolved X-ray absorption measurements with the goal of determining the structure and dynamics of the … link grabber chrome edge extension