SURFACE PRASEODYMIUM SPECIES ON MGO - CHARACTERIZATION AND ACTIVITY FOR OXIDATIVE COUPLING OF METHANE

Authors
BARONETTI GT GROSSO WE MAINA SP PADRO CL CASTRO AA SCELZA OA LATASA JMP
Citation
Gt. Baronetti et al., SURFACE PRASEODYMIUM SPECIES ON MGO - CHARACTERIZATION AND ACTIVITY FOR OXIDATIVE COUPLING OF METHANE, Journal of chemical technology and biotechnology, 70(2), 1997, pp. 141-146
Citations number
17
Categorie Soggetti
Engineering, Chemical",Chemistry,"Biothechnology & Applied Migrobiology
Journal title
Journal of chemical technology and biotechnology → ACNP
ISSN journal
02682575
Volume
70
Issue
2
Year of publication
1997
Pages
141 - 146
Database
ISI
SICI code
0268-2575(1997)70:2<141:SPSOM->2.0.ZU;2-8
Abstract
On pulsing CH4 over MgO containing various amounts of praseodymium oxi de (PrOx) at 1023 K, the CH4 conversion decreased with increasing puls e number, and both the initial activity and selectivity to C-2 product s (corresponding to the first pulse) decreased with increasing PrOx co ntent. Characterization by XRD, SEM-EDX and XPS showed calcined materi als to contain well-dispersed PrOx (x = 1.83-2) at low Pr concentratio ns, but only crystalline PrO1.83 at high (10 wt%) Pr concentration. A PrO1.83 phase was present at all Pr concentrations after the He treatm ent at 1023 K, and PrO1.83, PrO1.75 and PrO1.5 after reaction.