Lanthanum ion exchange on h-zsm-5
WebbIn 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.
Lanthanum ion exchange on h-zsm-5
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WebbBriefly, H-ZSM-5 of Al2O3-to-SiO2 ratios of 25 and 38 were used (denoted as ‘H-ZSM-5(25) and H-ZSM-5(38)’). Different contents of doped-metal were achieved by performing an additional ion-exchange procedure with the corresponding metal nitrate precursor, where these samples are denoted as ‘2Fe/Zn-ZSM-5(25/38)’. Webb1 apr. 2011 · The lanthanons are isolated as sulphates and converted to hydroxides. Thorium and cerium are insoluble in hydrochloric acid at pH 3·5. The other lanthanons are adsorbed on Dowex-50...
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. Webb15 feb. 2024 · In this work, a lanthanum carbonate grafted ZSM-5 adsorbent (LC-ZSM-5) was prepared and optimized by a Box-Behnken design. The higher temperature, molar …
Webb3 feb. 2024 · The catalyst lifetimes to 50 % conversion were: conventional ZSM-5 10 h, mesoporous ZSM-5 28 h, macroporous ZSM-5 32 h and macro/mesoporous ZSM-5 78 h. The coke content in the four spent catalysts, after ... After each ion exchange step the solid was recovered by centrifugation, ... Webb15 okt. 2024 · The H-ZSM-5 catalyst provides high conversion rates and excellent selectivity for aromatics compared to other catalysts [9,10]. The key step in H-ZSM-5 …
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.
WebbHere we report a lanthanum modified Fe-ZSM-5 (LaFe-ZSM-5) catalyst for enhanced selective methane oxidation with suppressed H 2 O 2 consumption. Using 0.5 wt% LaFe-ZSM-5 pretreated with H 2 the productivity of primary oxygenated products (CH 3 … paid 20 screening for diabetes depressionWebbFor 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 paid 12 month maternity ctWebb23 maj 2009 · In order to enhance the catalytic stability of the ZSM-5, in the present paper, lanthanum oxides were real time modified to ZSM-5 during the hydrothermal synthesis … paid 10 dollars for every 20 party-subs madeWebbThe catalytic performance of each catalyst was studied in a fixed bed reactor at a temperature 475 °C, WHSV 3-83 h and two different pressures (1 and 10 bar). ZSM-5 zeolites with different crystal sizes (5, 50 and 100 μm) were synthesized in house and compared with the commercially obtained ZSM-5 having a crystal size of 0.5 μm. paic theorem examplesWebb弹药；爆破; 织造; 塑料的加工；一般处于塑性状态物质的加工; 开启或封闭瓶子、罐或类似的容器；液体的贮运; 印刷；排版 ... paicv face bookWebb15 mars 2014 · The effect of the manner and conditions of introducing lanthanum cations into NH4-ZSM-5 zeolite on the properties of catalysts for the conversion of dimeth … paid 20000 in federal taxesWebb1 nov. 2014 · The NaZSM-5 was exchanged with 0.4 M ammonium nitrate solution at ambient temperature for 2 h (3 times) to convert it into the NH 4 ZSM-5 form. After the … paid2shoot camera