Alkaline-acid treated zeolite L as catalyst in ethanol dehydration process

Tarach, Karolina A.; Tekla, Justyna; Filek, Urszula; Szymocha, A.M.; Tarach, Iwona; Góra‐Marek, Kinga

doi:10.1016/j.micromeso.2016.12.035

Cited by 31 publications

(17 citation statements)

References 55 publications

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“…S7 †). [41][42][43] The TIPB conversion data of both parent and modied zeolites are presented in Table 4 (the product selectivity values are available in Table S2 †). It has been shown that the activity of zeolite based catalysts in this reaction is determined by the accessibility of BAS to the bulky TIPB molecules.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites

et al. 2019

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“…The spent catalysts were also studied by Raman and IR spectroscopies toward an identification of carbonaceous entities with short‐range order and molecular structures. The ratio between the intensity of the bands associated with the C=C stretching vibrations of conjugated olefins and the isolated C=C double bonds in disordered aromatic structures quantifies the deactivation process. Figure shows the evolution of higher amounts of carbonaceous species in the mesoporous zeolites than in the microporous analogue.…”

Section: Figurementioning

confidence: 99%

Operando Study Reveals the Superior Cracking Activity and Stability of Hierarchical ZSM‐5 Catalyst for the Cracking of Low‐Density Polyethylene

et al. 2018

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A new theoretical and practical framework has been developed through operando study of the zeolite catalytic cracking of low‐density polyethylene (as a model reaction) under reaction conditions. Results show that microporous ZSM‐5 gives rise to less cracking products. Hierarchical ZSM‐5 zeolites are more active cracking catalysts, rendering more C2‐C5 hydrocarbons, with a delayed deactivation due to the secondary porosity. This tool in combination with thermogravimetric analysis provides complementary and valuable information for the study, and design of advanced catalysts.

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“…The parent zeolite exhibits a low intensity peak at 3730 cm −1 , commonly assigned to Si‐OH in defects. [ 26 ] Deconvoluted peaks in the OH region are shown in Figure S8, Supporting Information. The band at 3634 cm −1 is attributed to the acidic bridging hydroxyl Si(OH)Al groups and a broad band centered around 3250 cm −1 to hydroxyl groups located in cancrinite cage.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Zeolite L Etching with Ammonium Fluoride and Ammonium Bifluoride Solutions

Babić

Tang

Qin

et al. 2020

Adv Materials Inter

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A commercial zeolite L was subjected to chemical etching with aqueous solutions of NH 4 F and NH 4 HF 2 to generate secondary porosity. The derived samples were characterized by X-ray diffraction, N 2 adsorption, scanning and transmission electron microscopy, 27 Al MAS NMR, thermogravimetric analysis, and their acid sites were quantified by FTIR spectroscopy of adsorbed basic probe molecules. The catalytic properties of the pristine and modified zeolites were evaluated in the dealkylation of 1,3,5-triisopropylbenzene. Tuning the etching conditions allowed us to generate hierarchical zeolites without losing micropore volume. Furthermore, both fluoride etchants did not change the acid properties of the zeolite substantially, which is confirmed by chemical composition anlysis (ICP-AES) and by FTIR spectroscopy of pyridine. The dissolution rate of zeolite L was much faster with NH 4 HF 2 than NH 4 F. The set of experimental data shows that the 1 wt % NH 4 HF 2 solution is an efficient etchant able to generate mesopores without affecting the parent zeolite properties as lower amounts of fluoride source are required than with concentrated (20-40 wt %) NH 4 F solutions. Received: ((will be filled in by the editorial staff)) Revised: ((will be filled in by the editorial staff)) Published online: ((will be filled in by the editorial staff))

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Alkaline-acid treated zeolite L as catalyst in ethanol dehydration process

Cited by 31 publications

References 55 publications

Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites

Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites

Operando Study Reveals the Superior Cracking Activity and Stability of Hierarchical ZSM‐5 Catalyst for the Cracking of Low‐Density Polyethylene

Comparative Study of Zeolite L Etching with Ammonium Fluoride and Ammonium Bifluoride Solutions

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