NDLI: Decoupling porosity and compositional effects on desilicated ZSM-5 zeolites for optimal alkylation performance

Content Provider	Royal Society of Chemistry (RSC)
Author	Milina, Maria Trinidad, Zair Domínguez Verboekend, Danny Pérez-Ramírez, Javier Mitchell, Sharon
Copyright Year	2012
Abstract	Desilication of conventional zeolites in alkaline medium generates variable intracrystalline mesoporosity, but inevitably changes other properties such as the Si/Al ratio and aluminium distribution. Assessing the individual effects of porosity and composition on the catalytic performance of desilicated zeolites is relevant for their optimal design. Herein, we decouple the respective impacts in the acid-catalysed alkylation of toluene (or cyclohexylbenzene) with benzyl alcohol. These reactions experience strong accessibility constraints to the micropores, providing high sensitivity to the properties of the developed mesopore surface. Through strategic comparison of alkaline-treated ZSM-5 zeolites prepared with and without subsequent acid treatment, we show that while acidity is important, the alkylation activity is dominated by the mesoporous surface area. The selectivity to (methylbenzyl)benzene does not depend on the available external surface. Excessively large mesopore volumes are detrimental to the activity, and variation in micropore volume has a minimal effect. Acid-treated mesoporous zeolites exhibit higher catalytic activities primarily due to textural enhancements by removal of aluminium-rich amorphous debris. The catalytic results are rationalised on the basis of extensive characterisation (AAS, N2 sorption, XRD, TEM, 27Al MAS NMR, FTIR, NH3-TPD, and adsorption of toluene and cyclohexylbenzene).
Starting Page	759
Ending Page	766
Page Count	8
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	2
Issue Number	4
Journal	Catalysis Science & Technology
DOI	10.1039/c2cy00456a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Acid Magic angle spinning Toluene ZSM-5 Aluminium Benzyl alcohol Sorption X-ray crystallography Mesoporous material Ammonia Transmission electron microscopy Adsorption Benzene Porosity Nuclear magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Catalysis

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