Izvorni znanstveni članak
https://doi.org/10.15255/KUI.2021.078
Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity
Zahira Mohamed Seghir
; Laboratory of Structure, Elaboration and Application of Molecular Materials, SEA2M Department of Process Engineering, University Abdelhamid Ibn Badis, Mostaganem, Alžir
Mhamed Djennad
; Laboratory of Structure, Elaboration and Application of Molecular Materials, SEA2M Department of Process Engineering, University Abdelhamid Ibn Badis, Mostaganem, Alžir
Reinhard Schomäcker
; Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10 623 Berlin, Njemačka
Mouffok Redouane Ghezzar
; Laboratory of Science and Technical Environment and Valorization, Department of Process Engineering, University Abdelhamid Ibn Badis, Mostaganem, Alžir
Sažetak
The requirement for environmentally friendly catalysts for the isomerization of alkanes has prompted research on the tungstate-zirconia (WZ) system. The present work examines the activity and selectivity of lanthanum (La) promoted tungstate-zirconia (LWZ) and niobium (Nb) promoted tungstate-zirconia (NWZ) catalysts. In this study, 1 % La promoted WZ (1 % LWZ) and 1 % Nb promoted WZ (1 % NWZ) catalysts were investigated in isomerization of n-butane in the presence of hydrogen. The studied catalysts were characterized by different methods: nitrogen physisorption, temperature programmed desorption of NH3, thermogravimetric analysis, and X-ray diffraction. The catalytic activity and selectivity were significantly improved by the addition of 1 % Nb. The redox process in the Nb-containing catalyst (1 % NWZ) played a central role by providing the highest acidic sites (283.53 µmol g–1) with appropriate activation energies for the skeletal rearrangement of the reactant (n-butane). Furthermore, this study highlights the determining role of the transfer process of adsorbed species from ZrO2 to W as well as to the Nb environment. The conversion of n-butane (27.34 %) and the selectivity to i-butane (92.34 %) for NWZ were significantly higher than WZ and LWZ catalysts. The experimental results revealed that Nb was a more effective promoter than La.
Ključne riječi
tungstated zirconia; n-butane isomerization; niobium; lanthanum; acidity
Hrčak ID:
280607
URI
Datum izdavanja:
18.7.2022.
Posjeta: 333 *