Synthesis of zeolite MCM-22 under rotating and static conditions

Guray, Ipek; Warzywoda, Juliusz; Baç, Nurcan; Sacco, Albert

doi:10.1016/s1387-1811(99)00075-x

Cited by 110 publications

(39 citation statements)

References 21 publications

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“…15,16 However, if the synthesis is carried out in static, the crystallization of MWW(P) is more difficult and other phases such as Ferrierite or Mordenite coexist. 17 Nevertheless, previous aging of the synthesis gel at temperatures higher than 180ºC…”

Section: 1-bi-dimensional (2d) Layered Zeolitic Precursorsmentioning

confidence: 99%

Layered zeolitic materials: an approach to designing versatile functional solids

2014

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Section: 1-bi-dimensional (2d) Layered Zeolitic Precursorsmentioning

confidence: 99%

Layered zeolitic materials: an approach to designing versatile functional solids

2014

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“…1. MCM-22, MCM-22(12) and MCM-22(120) have the MWW structure [53], but the diffraction peaks are less intense and broader for the materials prepared at lower HMI/TPOAC ratio. The material prepared at a HMI/TPOAC ratio of 6 was almost completely X-ray amorphous.…”

Section: Acid Catalyst Preparation and Physico-chemical Propertiesmentioning

confidence: 99%

“…A literature procedure was employed for the preparation of bulk MCM-22 [53]. This recipe was modified to generate mesoporosity by adding an organosilane.…”

Section: Synthesis Of Materialsmentioning

confidence: 99%

One-pot synthesis of nano-crystalline MCM-22

Tempelman

Portilla

Martínez-Armero

et al. 2016

Microporous and Mesoporous Materials

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Nano-crystalline MCM-22 zeolite was synthesized in a one-pot procedure by the use of an organosilane (dimethyl-octadecyl-(3-trimethoxysilylpropyl)-ammonium chloride, TPOAC) in the zeolite synthesis gel. This crystal growth inhibition procedure introduced mesopores in the MCM-22 crystallites. The lower mechanical stability of the nano-crystalline MCM-22 zeolite compared with bulk MCM-22 can be countered to some extent by pillaring. The increased external surface of the microporous zeolite domains resulted in increased accessibility of the Brønsted acid sites, as followed from the better performance in liquidphase benzene alkylation with propylene as compared with bulk MCM-22. The increased accessibility of the internal acid sites in Mo-loaded hierarchical MCM-22 was also evident from the improved benzene selectivity during methane aromatization. Silylation of hierarchical Mo/MCM-22 was detrimental for the catalytic performance in MDA. The nano-crystalline MCM-22 has physico-chemical and catalytic properties intermediate between those of MCM-22 and ITQ-2 with the benefit over ITQ-2 that it can be synthesized in a single step.

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“…Zeolite MCM-22 with Si/Al ratio of 25 was synthesized hydrothermally, using hexamethylenamine as the template, based on the procedure described elsewhere [12]. The as-synthesized zeolite was firstly calcined at 550 • C under dry air to remove the template, and the above sample was transformed into the NH 4 -form by ion-exchange with NH 4 NO 3 solution.…”

Section: Catalyst Preparationmentioning

confidence: 99%