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Simple and scalable synthesis of highly active Lewis acidic Sn-b [Abstract]

Hammond, Ceri ORCID: https://orcid.org/0000-0002-9168-7674, Conrad, Sabrina and Hermans, Ive 2013. Simple and scalable synthesis of highly active Lewis acidic Sn-b [Abstract]. Presented at: 245th ACS National Meeting, New Orleans, LA, 7-11 April 2013. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY. American Chemical Socieity:

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Abstract

The Lewis acidic zeolite Sn-b is an important catalyst in the area of sustainable chemistry. Its ability to perform essential chemical transformations, such as isomerizations and oxidations, at high levels of activity and selectivity, whilst also possessing the favourable properties of a heterogeneous material, means that industrial interest is at an all time high. Nevertheless, some significant practical hurdles remain that currently curtail industrial implementation. Amongst these, the lengthy and complicated synthetic procedure, the low amount of active metal incorporated per kilogram of final catalyst, and the large crystallite sizes remain the most prohibitive. Recently, we reported a much more favourable route for the preparation of Sn-b, via a two-step post-synthetic procedure. An optimal commercial b-zeolite, possessing both small crystallite size and a high SiO2/Al2O3 ratio (25), was first dealuminated by an established acidic treatment in concentrated HNO3. Subsequently, the dealuminated zeolite was mechanically mixed with the precursor, tin(II)acetate. The preparation procedure is completed with a high temperature pre-treatment in flowing air (550 ºC). A multitude of spectroscopic techniques verified that the operational catalysts contained exclusively isolated, tetrahedral SnIV sites, and the catalytic performance was evaluated through the Baeyer-Villiger oxidation of cyclohexanone, and the conversion of dihydroxyacetone to ethyl lactate. Given its high active metal content and favourable physical properties, the observed space-time-yield was one order-of-magnitude higher than previously reported for these reactions, which are of significant industrial interest for the sustainable production of polymers and plastics.

Item Type: Conference or Workshop Item (Other)
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Oral session, Division: CATL: Division of Catalysis Science and Technology. Thursday, April 11, 2013 - 03:00 PM. Session Info: Novel Discoveries in Catalysis (01:00 PM - 05:00 PM)
Additional Information: ACS National Meeting Abstracts. Published online: http://www.acs.org/
Last Modified: 25 Oct 2022 09:10
URI: https://orca.cardiff.ac.uk/id/eprint/57524

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