Alkali-free synthesis of Al-MTW using 4-cyclohexyl-1,1-dimethylpiperazinium hydroxide as structure directing agent

Synthesis of MTW-type zeolites was carried out for the first time using 4-cyclohexyl-1,1-dimethylpiperazinium hydroxide as structure directing agent. An alkali-free and fluoride-free synthesis procedure for incorporation of aluminum into the MTW-framework was developed. The Al-MTW product has strong...

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Vydané v:	Microporous and mesoporous materials Ročník 143; číslo 2; s. 477 - 481
Hlavní autori:	De Baerdemaeker, Trees, Müller, Ulrich, Yilmaz, Bilge
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	San Diego, CA Elsevier Inc 01.09.2011 Elsevier
Predmet:	Alkali-free synthesis Catalysis Catalyst Chemistry Colloidal state and disperse state Exact sciences and technology Fluoride-free synthesis General and physical chemistry Ion-exchange Porous materials Surface physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Zeolite Zeolites: preparations and properties ZSM-12 ZSM-12 Zeolite Alkali-free synthesis Fluoride-free synthesis Catalyst Incorporation Hydroxides Acidic site Porous material Molecular sieve Solid Template Synthesis Ion exchange Scanning electron microscopy Crystals Aluminium Fluorides Strong acid X ray diffraction Sorption Ammonia Transmission electron microscopy Adsorption Pore Morphology Open systems
ISSN:	1387-1811, 1873-3093
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Shrnutí:	Synthesis of MTW-type zeolites was carried out for the first time using 4-cyclohexyl-1,1-dimethylpiperazinium hydroxide as structure directing agent. An alkali-free and fluoride-free synthesis procedure for incorporation of aluminum into the MTW-framework was developed. The Al-MTW product has strong acid sites and can be directly utilized as a solid acid catalyst without going through any ion-exchange procedures. [Display omitted] . ► Synthesis of MTW zeolites using 4-cyclohexyl-1,1-dimethylpiperazinium hydroxide. ► Alkali-free and fluoride-free synthesis of Al-MTW. ► Al-MTW with strong acid sites obtained without any ion-exchange. ► Effect of seed crystals in Al-MTW synthesis. Synthesis of MTW-type zeolites was carried out for the first time using 4-cyclohexyl-1,1-dimethylpiperazinium hydroxide as structure directing agent. An alkali-free and fluoride-free synthesis procedure for incorporation of aluminum into the MTW-framework was developed. Products were characterized using XRD, FE-SEM, HR-TEM, EDXS, ICP-OES, N 2-sorption, Ar-sorption and NH 3-TPD. The Al-MTW product from this new synthesis route is stable after calcination at 600 °C and has an open pore/channel system. The Si/Al ratio of the Al-MTW crystals was found to be 50. The NH 3-TPD studies demonstrated that the new Al-MTW product has strong acid sites and can be directly utilized as a solid acid catalyst without going through any ion-exchange procedures. Utilization of seed crystals in Al-MTW synthesis was also investigated and its influence on product morphology was identified.
ISSN:	1387-1811 1873-3093
DOI:	10.1016/j.micromeso.2011.03.018