Increasing the catalytic performance of erionite by hierarchization
Justyna Tekla , Louwanda Lakiss , Valentin Valchev , Karolina A. Taracha , Magdalena Jabłońska , Vladimir Girmand , Agnieszka M. Szymocha , Andrzej Kowalczyk , Kinga Góra-Marek , Jean-Pierre Gilson
AbstractThe texture and acidity of a parent synthetic erionite zeolite (ERI structure) are modified by a two-step top-down treatment involving acid (HNO3) and base (NaOH) biased leaching as well as an unbiased HF/NH4F leaching. These zeolites are compared to a bottom-up prepared nanosized ERI, UZM-12. The structural (XRD, 29Si MAS NMR), textural (N2 adsorption-desorption, STEM) and acidic (FT-IR spectroscopy of adsorbed probe molecules) properties of the parent and hierarchical ERI are also carefully monitored. Among all top-down hierarchization strategies applied for 8-ring ERI structure, the sequential leaching in acid (HNO3) and caustic (NaOH) solutions is the most efficient to add mesoporosity to the native microporosity. The catalytic performances of the hierarchical materials and their parent are assessed in the dealkylation of 1,3,5-triisopropylbenzene (TiPBz); they are in line with the mesoporous external surface area and the external surface acid site density for all samples. The best top-down hierarchical ERI has similar catalytic properties as the nanosized ERI, UZM-12.
|Journal series||Microporous and Mesoporous Materials, ISSN 1387-1811, e-ISSN 1873-3093, (N/A 100 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Erionite, Demetallation, Hierarchical zeolites, 1,3,5-Triisopropylbenzene dealkylation|
|ASJC Classification||; ; ;|
|Publication indicators||: 2016 = 1.198; : 2018 = 4.182 (2) - 2018=3.84 (5)|
|Finansowanie||This work was financed by Grant No. 2015/18/E/ST4/00191 from the National Science Centre, Poland. The STEM studies were realized within the frame of the project “Infrastructure Improving of Centre of Excellence of Advanced Materials with Nano- and Submicron- Structure”, which is supported by the operational Program “Research and Development” financed through European Regional Development Fund.|
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