Lanthanum ion exchange on h-zsm-5
Webb13 apr. 2024 · Cu-exchanged SSZ-16 zeolite catalysts exhibit outstanding NH3-SCR activity, but their catalytic performance after hydrothermal treatments is not ideal. In order to improve the hydrothermal stability of Cu-SSZ-16, CuCex-SSZ-16 series catalysts were prepared via an ion exchange process, and the effect of Ce modification on the … Webbthe charges on both Al and O atoms in Ln-ZSM-5 zeolite show an obvious increase, which will undoubtedly lead to a stronger mutual interaction and hence enhance the stability of …
Lanthanum ion exchange on h-zsm-5
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Webb12 juni 2024 · H-ZSM-5-100 and K-ZSM-5-100 samples were prepared from ion-exchanges of NH 4 NO 3 solution (1 mol/L) and KCl solution (1 mol/L) at 80 °C for 5 h, respectively (In order to decrease Na +... Webb15 maj 2024 · This study focuses on lanthanum supported on conventional zeolites, such as H-BEA and H-ZSM-5. However, since La is a quite large atom, 3.9 Å in diameter, and the diameter of the eight-membered ring of SSZ-13 is 3.7 Å in diameter, no attempt to impregnate SSZ-13 with La was made. Instead, SSZ-13 was investigated only in the …
WebbThe effect of steam treatment on Zn/H-ZSM-5 catalysts prepared by an ion-exchange method for non-oxidative ethane dehydroaromatization was investigated. Steam treatment of Zn/H-ZSM-5 after Zn loading improved its catalytic stability on aromatic hydrocarbon formation including benzene, toluene and xylene. WebbA closely related goal has been the preparation of Cu-ZSM-5 in which all of the charge-exchange sites are occupied by Cu cations. Characterization of Cu-ZSM-5 prepared by conventional aqueous exchange of Na-ZSM-5 with solutions of CuCl2, Cu(NO3)2, or Cu(CH3COO)2 has shown that the maximum exchange level is Cu/Al ˇ 0.5 and that the …
Webb27 jan. 2024 · The experiment was performed using HZSM-5 with SiO 2 /Al 2 O 3 ratio 20, at 450 °C, 15 bar, and 1 h −1 WHSV. The final product analysis indicated that the sulfur amount decreased to 19 ppm, which is comparable with the predicted value (i.e., 14) ppm using the model. It can be said that predicted values agree with experimental data. WebbDensity functional calculations have been employed to investigate the locating and binding of lanthanum cation, i.e., La(OH)2+, on HZSM-5 zeolite. Through geometry …
Webb15 dec. 2024 · The highest para-selectivity has been demonstrated by lanthanum-modified HZSM-5. Therefore, the purpose of this study was to investigate the effect of the …
Webb30 juni 2024 · Lanthanum-modified ZSM-5 zeolite was prepared by an impregnation method. 14.3 cc La (NO 3) 3 ·6H 2 O (0.013 M) was blended with 1 g HZSM-5 at 40 °C for 3 h. Then, it was dried in rotary (65 °C) and solid was dried overnight at 110 °C in oven and calcined at 650 °C for 5 h. The modified catalysts were presented by (Y)La/HZSM-5. pantone 2387cWebbFor comparison, ion-exchange treatment was carried out under mild conditions with 1.0 g ZSM-5 1.0 M L 1 Mn(NO 3) 2 at 80 C for 8 hours. A er the reaction, the solid was recovered by centrifugation, washed three times with distilled water and dried at 80 C overnight to obtain ion-exchanged Mn/ZSM-5. 2.4 Physical characterization pantone 2386Webb1 okt. 2010 · The Fe3+-doped TiO2/HZSM-5 possessed the anatase structures and Ti-O-Si bonds did not form between the HZSM-5 bulk and the supported TiO2. No full-text available Design of MFI Type... pantone 2385 cWebbIn H-ZSM-5, H+ ions occupy the zeolite ion exchange sites. H-ZSM-5 can be synthesized with an infinite number of different Si/Al ratios, the variation of which affects the material’s crystal configuration, porosity, and particle size, and impacts the overall strength and distribution of acid sites. エンレスト 添付文書 高血圧Webb1 apr. 1991 · Theion-exchangeisothermsweredeterminedby measuringboththe zeolite and solutionphasesfor bothionsin manycases.Thesolutionphaseat equilibriumwas … エンレスト 減量http://www.cchem.berkeley.edu/atbgrp/files/Chemistry%20of%20Materials%202406%2024%209%202447.pdf pantone 2388WebbX-ray diffraction data indicate that the crystalline structure of ZSM-5 is maintained on ion-exchange. 27 Al MAS NMR spectroscopy confirms that Lewis acid sites in all of the M … pantone2393c