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Exafs pt-o

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 ... Web此外，催化剂中未观察到Cu-Cu和Cu-O-Cu第二层构型，证实催化剂中存在孤立的Cu原子。Pt LIII边FT-EXAFS光谱(图4b)显示，PtCu-TiO2的Pt-Pt配位峰(2.3 Å)与Pt箔的Pt-Pt配位峰(2.4 Å)略有不同，这可能归因于Pt-Cu键的存在。由此推测，Pt-Cu的形成可能是Pt和Cu原子间电子转移的结果。

EXAFS structural determination of the Pt2(P2O ...

WebMay 21, 2015 · X-ray absorption near-edge structure and extended X-ray absorption fine structure (EXAFS) of Pt-sorbed bacteria suggested that Pt(IV) was reduced to Pt(II) on the cell’s surface, even in the absence of … 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 … painted goat conway ar https://editofficial.com

A feasibility study of “range-extended” EXAFS …

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 ... WebJun 3, 2024 · Their ex situ EXAFS studies found a shorter Pt–Pt bond in the Pt/Au than that in the Pt/C or Pt foil, but the shorter Pt–Pt was believed to contribute to the high ORR … 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 … subtracting integers video lesson

Catalysts Free Full-Text Single Atomic Pt on SrTiO3 Catalyst in ...

Category:In Situ X-ray Absorption Spectroscopy Studies of …

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Exafs pt-o

MCM41负载铂催化剂在甲烷同系聚合中的载体效应 - 豆丁网

WebJun 16, 2024 · The peak at 1.58 Å belonging to Pt-O coordination in the Pt/SrTiO 3-L catalyst, was sharper than that of Pt/SrTiO 3. The second peak at 2.8–3.2 Å, ... (EXAFS) of Pt was collected at the synchrotron radiation source (SSLS) center in Singapore, where the X-ray beam was monochromated with channel-cut Si [111] crystals. The k-edge … 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 ...

Exafs pt-o

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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 … WebMar 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 …

WebDownload scientific diagram Backscattering amplitude F (k) as a function of k for Pt-Pt, Pt-O and Pt-H EXAFS. E binding is converted to k-space according to k = (2m/ 2 )E binding . from ... WebApr 12, 2024 · （b）在Pt-TiO 2 、PtCu-TiO 2 、Pt和PtO 2 的LIII边缘的k 2 EXAFS光谱的傅立叶变换。（c）电子顺磁共振谱。（d）TiO 2 和（e）PtCu-TiO 2 在黑暗和光照过程中的Ti L边和O K边光谱。（f）样品在光照射下的Ti L边缘或O K边缘强度与在暗条件下的强度比值。 图5：反应机理

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 … WebThe k²-weighted Fourier transformed EXAFS signal of Pt(acac)2/Mg(In)(Al)O x calcined to 650 °C and bulk PtO 2 reference show similar profiles. However, the PtO 2 structure is inadequate to model this experimental signal, in contrast to a three shell model containing a Pt-O, Pt-O-Mg and Pt-O-Mg-O shell.

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 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 … subtracting integers word problems pdfWebAug 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 … painted golf courseWebApr 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。 subtracting integers with countersWebJul 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 … subtracting integers with chipsWeb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 … subtracting integers worksheets printablesubtracting integers using tilesWebJun 17, 2024 · The x-ray absorption near-edge structure (XANES) spectra of the as-prepared and in operando evaluated 1.0 wt % Pt 1-O x-Cs/SiO 2 catalyst reveal that the charge state of Pt in 1.0 wt % Pt 1-O x-Cs/SiO 2 decreases from around +4 but crucially does not become metallic Pt under reaction conditions , which is consistent with the … subtracting integers worksheet and answers