BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Penn Engineering Events - ECPv6.15.18//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Penn Engineering Events
X-ORIGINAL-URL:https://seasevents.nmsdev7.com
X-WR-CALDESC:Events for Penn Engineering Events
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20200308T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20201101T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20210314T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20211107T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20220313T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20221106T060000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210111T150000
DTEND;TZID=America/New_York:20210111T170000
DTSTAMP:20260407T055630
CREATED:20201221T160845Z
LAST-MODIFIED:20201221T160845Z
UID:3806-1610377200-1610384400@seasevents.nmsdev7.com
SUMMARY:CBE PhD Dissertation Defense | Study of Metal Catalysts Supported on Thin Films of Perovskites prepared by Atomic Layer Deposition (ALD)
DESCRIPTION:Abstract: \n\nSintering is a severe problem with supported-metal catalysts in high-temperature applications\, such as in automotive-emissions control\, because it leads to a loss of catalytically active surface area. To stabilize the metal particles\, in 2001\, the Daihatsu group proposed using perovskite-supported metals\, which they referred to as “intelligent” catalysts. The original goal was to regenerate sintered metals by driving the metal into the oxide lattice by high-temperature oxidation and releasing the metal as small particles by reduction. Unfortunately\, the concept has not been entirely successful\, partially because of the large crystallite size and low surface areas of typical perovskites. To achieve higher surface areas and reduce the length scale for any ingress-egress of metal particles\, Atomic Layer Deposition (ALD) was used in this thesis to prepare thermally stable thin films of perovskites on high-surface-area supports. Metal catalysts\, Pt\, Ni\, Pd\, and Rh\, were deposited onto the perovskite thin films\, LaCoO 3 and LaFeO 3 \, using ALD.\n\n\n\n\n\nThis thesis focused on studying metal-perovskite interactions in the ALD samples of metals supported on LaFeO 3 films. It was found that metal-perovskite interactions could dramatically affect the preferential alignment of metal particles with the substrate\, the metal dispersions\, and catalytic activity. In the presence of the perovskite films\, the equilibrium oxidation of the metals could also shift several order-of-magnitudes towards lower PO 2 . The changes in the thermodynamic properties would further cause different catalytic behaviors. Systems of different metals supported on LaFeO 3 films were studied and compared; it was found that the metal-perovskite interaction is specific for each system.
URL:https://seasevents.nmsdev7.com/event/cbe-phd-dissertation-defense-study-of-metal-catalysts-supported-on-thin-films-of-perovskites-prepared-by-atomic-layer-deposition-ald/
LOCATION:Zoom – Email CBE for link
CATEGORIES:Doctoral,Graduate,Dissertation or Thesis Defense
ORGANIZER;CN="Chemical and Biomolecular Engineering":MAILTO:cbemail@seas.upenn.edu
END:VEVENT
END:VCALENDAR