High Throughput Synthesis and Screening of New Catalytic Materials for the Direct Epoxidation of Propylene

Authors: Kahn, Michael; Seubsai, Anusorn; Onal, Isik; Senkan, Selim

Source: Combinatorial Chemistry & High Throughput Screening, Volume 13, Number 1, January 2010 , pp. 67-74(8)

Publisher: Bentham Science Publishers

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Abstract:

Nanoparticles of 35 individual metals as well as their binary combinations were synthesized using High Throughput pulsed laser ablation (PLA), and collected on Al2O3, CeO2, SiO2, TiO2, and ZrO2 pellets. These materials were then screened for their catalytic activities and selectivities for the partial oxidation of propylene, in particular for propylene oxide (PO), using array channel microreactors. Reaction conditions were the following: 1 atm pressure, gas hourly space velocity (GHSV) of 20,000 h-1, temperature 300 C, 333 C, and 367 C, and feed gas composition 20 vol% O2, 20 vol% C3H6 and balance He. Initial screening experiments resulted in the discovery of SiO2 supported Cr, Mn, Cu, Ru, Pd, Ag, Sn, and Ir as the most promising leads for PO synthesis. Subsequent experiments pointed to bimetallic Cu-on- Mn/SiO2, for which the PO yields increased several fold over single metal catalysts. For multimetallic materials, the sequence of deposition of the active metals was shown to have a significant effect on the resulting catalytic activity and selectivity.

Keywords: Heterogeneous catalysis; partial oxidation; laser ablation; nanoparticles; array micro-reactors

Document Type: Research article

DOI: http://dx.doi.org/10.2174/138620710790218230

Affiliations: 1: Department of Chemical Engineering, University of California, Los Angeles, CA 90095, USA.

Publication date: 2010-01-01

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Combinatorial Chemistry & High Throughput Screening publishes full length original research articles and reviews describing various topics in combinatorial chemistry (e.g. small molecules, peptide, nucleic acid or phage display libraries) and/or high throughput screening (e.g. developmental, practical or theoretical). Ancillary subjects of key importance, such as robotics and informatics, will also be covered by the journal. In these respective subject areas, Combinatorial Chemistry & High Throughput Screening is intended to function as the most comprehensive and up-to-date medium available. The journal should be of value to individuals engaged in the process of drug discoveryand development, in the settings of industry, academia or government.

High Throughput Synthesis and Screening of New Catalytic Materials for the Direct Epoxidation of Propylene

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