A comparative study of bulk and supported chromia catalysts for the fluorination of trichloroethylene

Authors
Rao, JM Sivaprasad, A Rao, PS Narsaiah, B Reddy, SN Vijayakumar, V Manorama, SV Krishna, KL Srinivas, K Krishnan, KR Badrinarayanan, S
Citation
Jm. Rao et al., A comparative study of bulk and supported chromia catalysts for the fluorination of trichloroethylene, J CATALYSIS, 184(1), 1999, pp. 105-111
Citations number
39
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
JOURNAL OF CATALYSIS
ISSN journal
00219517 → ACNP
Volume
184
Issue
1
Year of publication
1999
Pages
105 - 111
Database
ISI
SICI code
0021-9517(19990515)184:1<105:ACSOBA>2.0.ZU;2-Q
Abstract
The photoelectron spectroscopy of Cr2O3 and impregnated Cr2O3/Al2O3 catalys ts was studied before and after treatment with anhydrous hydrogen fluoride (AHF) and after reaction of trichloroethene (TRI) with AHF. XPS results ind icate formation of both hydroxyfluorides and fluorides of Cr and Al. The bi nding energy values of the Cr2p(3/2) levels of oxides, and also of fluorina ted species, were found to be different in bulk and supported catalysts. Th e fluorinated catalysts from Cr2O3 and impregnated and coprecipitated Cr2O3 /Al2O3 exhibit the same order of activity in the fluorination of TRI in ter ms of conversion and selectivity to 2-chloro-1,1,1-trifluoroethane but they differ in life span. Bulk Cr2O3 exhibits a longer life span. (C) 1999 Acad emic Press.