Effects of preparation conditions on gold/Y-type zeolite for CO oxidation
Resource
Applied Catalysis B: Environmental 41(1-2), 83-95
Journal
Applied Catalysis B: Environmental 41(1-2)
Pages
83-95
Date Issued
2003
Date
2003
Author(s)
Lin, Jiunn-Nan
Wan, Ben-Zu
DOI
246246/2006111501232949
Abstract
The effects of preparation conditions (i.e. chloroauric acid concentration, pH of gold solution, solution temperature, and
mixing time) on gold supported on Y-type zeolite (Au/Y) for CO oxidation were studied. The catalysts were characterized
by AA, temperature-programmed reduction (TPR), XRD, TEM and XPS, in order to understand the correlation of the gold
precursors in the solution and the gold particles in Y-type zeolite to the catalytic activity. It was found that more gold species
prepared in the supercage of Y-type zeolite would enhance Au/Y with higher catalytic activity. However, higher pH, higher
gold concentration and lower temperaturewould generate more and larger gold species in the solution, which caused large gold
particles prepared on the exterior surface of Au/Y. Due to the limited surface area, these large particles provided little activity
for the reaction. Moreover, lower pH and lower gold concentration would generate more gold monomers in the solution
at higher solution temperature, which caused more gold species prepared in the sodalite cage of Au/Y. Due to molecular
sieving effect, they were not available for CO oxidation. It can be concluded from this study that Au/Y prepared from a gold
solution with surface acidity modified Y-type zeolite (1 g of zeolite per 125 ml solution), with initial gold concentration around
1.46 × 10−3 M, solution pH at 6, solution temperature around 80 ◦C, and mixing time for 1 h would possess an optimum
catalytic activity for CO oxidation.
Subjects
Gold
Y-type zeolite
CO oxidation
Gold solution
Concentrations
Temperature
pH
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
7351.pdf
Size
23.28 KB
Format
Adobe PDF
Checksum
(MD5):2faa3b983f7fac296d0c5bb3a685218e