####################################################
# Joo Kang <kang@mrl.uiuc.edu>
# requesting 5 days, at minimum=4 days
# beamline 33BM, EXAFS of supported bi- and mono-metallic nanoparticles
# instrument 33BM-B XAFS
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# top:/home/www/beamtime-requests/req01067.txt
# UNICAT Member Beam Time Request  #1067
# created Mon Nov 20 18:08:49 CST 2006
####################################################

apsrun:
	2006-03

beamline:
	33BM

collaboration:
	No

collaborator_Jenia:
	ON

contact:
	kang@mrl.uiuc.edu

days:
	5

description:
	Structure senstivity of several supported mono- and bi-metallic catalysts will be studied for different their geometric and electronic structure. By changing the amount of second metallic species (Ir, Re or Ru) we expect to see the evolution of different electronic and geometric structural behaviors of the supported catalysts. Static and dynamic structural behaviors in different atmosphere will be tested.

The supported catalysts will be mounted in an home-built XAFS cell and XAFS measurements will be made under different atmosphere (4 % H2 in He, 99.99% He, 20% O2 in He) and at different sample temperatures ranging from 150 K to 700 K. The temperature will be controlled by liquid nitrogen and resistive heating element. Similar experiments have been performed at the beam line 33BM-B with monometallic Pt and Au catalysts and Pt-Ir bimetallic catalyst. Stainless steel tubing will be used for flow of all gases.  

Samples include Au on TiO2, Au on C, Pt on C, Pt-Ir, Pt-Ru, Pt-Re bimetallic particles on Al2O3.

equipment_required:
	

experiment:
	EXAFS of supported bi- and mono-metallic nanoparticles

foreign_nationals:
	Joo Kang

hazards:
	

instrument:
	33BM-B XAFS

instrument_other:
	

minimumdays:
	4

name:
	Joo Kang

nonmembers:
	

submit:
	Submit

unacceptable_dates:
	***** This proposal is for the 1st run in 2007 *******
2/12/2007;
3/23/2007-3/30/2007;
4/7/2007-4/15/2007

z34ID_details:
	


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