New Catalytic Materials for the Direct Epoxidation of Propylene by Oxygen: Application of High-Throughput Pulsed Laser Ablation

Kahn, Michael
Seubsai, Anusorn
Önal, Işık
Senkan, Selim
New catalytic materials were prepared by depositing nanoparticles of 35 different metals as well as their select binary combinations on Al2O3, CeO2, SiO2, TiO2, and ZrO2 supports. Nanoparticles were synthesized by high-throughput pulsed laser ablation (PLA). Catalytic materials were then screened for their selectivities towards the synthesis propylene oxide (PO) from propylene and oxygen using array channel microreactors at 1 atm and 300, 333, and 367 A degrees C. A gas hourly space velocity (GHSV) of 20,000 h(-1) was used at the feed gas composition of 20% O-2, 20% C3H6 and the 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.


High Throughput Synthesis and Screening of New Catalytic Materials for the Direct Epoxidation of Propylene
Kahn, Michael; Seubsai, Anusorn; Önal, Işık; Senkan, Selim (2010-01-01)
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), temp...
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Sen, Fatih; Goekagac, Guelsuen (2008-05-01)
PtRu/C catalysts, which have different atomic percent ratios of Pt and Ru (Pt/Ru = 0.8 (catalyst A), 2.1 (catalyst B), and 3.5 (catalyst C)), were prepared using PtCl4 and RuCl3 as starting materials and tert-octanethiol as a surfactant for the first time. Each was characterized by X-ray diffraction, transmission electron microscopy, energy dispersive analysis, X-ray photoelectron spectroscopy, cyclic voltammetry, and elemental analysis, and their activities were determined toward the methanol oxidation rea...
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Two new highly stable electrochromic polymers, poly(5,8-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2,3-di(thiophen-2-yl)quinoxaline) (PDETQ) and poly (5,8-bis(2,3 -dihydrothieno[3,4-b][ 1,4]dioxin-5yl)quinoxaline) (PDEQ) were synthesized, and their potential use as neutral state green polymeric materials was investigated. Spectroelectrochemistry showed that both polymers reveal two distinct absorption bands as expected for this type of donor-acceptor polymer, at 410 and 660 nm for PDEQ and 405 and 780 nm...
A novel integrated process for the functionalization of methane and ethane: bromine as mediator
Lorkovic, IM; Yılmaz, Ayşen; Yilmaz, GA; Zhou, XP; Laverman, LE; Sun, SL; Schaefer, DJ; Weiss, M; Noy, ML; Cutler, CI; Sherman, JH; McFarland, EW; Stucky, GD; Ford, PC (Elsevier BV, 2004-11-24)
We describe a novel, integrated multi-step process for the partial oxidation of alkanes to alcohols, ethers or olefins using O-2 as oxidant. The sequential transformations are (1) alkane bromination to alkyl bromide(s) and HBr, (2) reaction of this mixture with solid metal oxide (MO) to neutralize the HBr and to generate oxygenated products or olefins plus solid metal bromide, and (3) oxidation of the spent solid with 02 to regenerate the metal oxide and Br-2 for reuse.
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Aqueous solutions of lead chloride (PbCl2), zirconium oxychloride (ZrOCl2.8H(2)O) and titanium tetrachloride (TiCl4), in appropriate volumetric amounts, were used as the starting materials in the synthesis of phase-pure Pb(Zr0.52Ti0.48)O-3 powders. Preparation of the phase-pure PZT powders were achieved, in the presence of urea (CH4N2O), by the chemical powder synthesis route of homogeneous precipitation.
Citation Formats
M. Kahn, A. Seubsai, I. Önal, and S. Senkan, “New Catalytic Materials for the Direct Epoxidation of Propylene by Oxygen: Application of High-Throughput Pulsed Laser Ablation,” TOPICS IN CATALYSIS, pp. 86–91, 2010, Accessed: 00, 2020. [Online]. Available: