Platinum- and iron-doubly promoted tungstated zirconia catalyst for n-butane isomerization reaction

Wong, Samson S. Y.; Li, Tao; Cheng, Sheng-Tzong; Lee, Jyh‐Fu; Mou, Chung‐Yuan

doi:10.1016/j.apcata.2005.08.004

Cited by 11 publications

(2 citation statements)

References 29 publications

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“…They are responsible for the protonation of the butene formed from the dehydrogenation of n-butane, and this reaction further leads to the formation of carbonic intermediates for the isomerization reaction. 46 The Brønsted acidity thus influences directly the rate of isomerization and coke formation of the catalyst in this reaction.…”

Section: Resultsmentioning

confidence: 99%

Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity

Seghir

Djennad²,

Schomäcker

et al. 2022

Kemija U Industriji

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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 NH 3 , 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 ZrO 2 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.

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Section: Resultsmentioning

confidence: 99%

Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity

Seghir

Djennad²,

Schomäcker

et al. 2022

Kemija U Industriji

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show abstract

“…In n-butane isomerization, the Bro ¨nsted acid sites play a very important role. They are responsible for the protonation of butene formed from the dehydrogenation of n-butane, and this reaction leads further to the formation of carbene intermediates for the isomerization reaction [13]. The Bro ¨nsted acidity thus has a direct influence on the isomerization rate and coke formation of AW/m-ZrO 2 catalyst in this reaction.…”

Section: Acidity Of the Catalystsmentioning

confidence: 99%

Enhanced catalytic activity for butane isomerization with alumina-promoted tungstated mesoporous zirconia

Hwang

Chen

Wong

et al. 2007

Applied Catalysis A: General

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Olefin isomerization reactions catalyzed by ruthenium hydrides bearing Schiff base ligands

Ding

Doorslaer

Cool

et al. 2011

Applied Organom Chemis

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A series of in situ-generated ruthenium hydride complexes Ru(PPh 3 ) 2 (CO)H(L n ) (n = a-h) incorporating a Schiff base ligand was investigated for the isomerization of olefins. 1 H-NMR was used to characterize the new hydride species in combination with 31 P-NMR. Allylbenzene and 1-octene were used as model substrates. Temperature, solvents and catalyst/substrate mole ratio were taken into account as parameters to optimize the isomerization reaction. All catalysts showed the best performance in 2-butanol, suggesting that the catalytic activity depends not only strongly on the steric and electronic environment of the ruthenium but also on the chosen solvent.

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Platinum- and iron-doubly promoted tungstated zirconia catalyst for n-butane isomerization reaction

Cited by 11 publications

References 29 publications

Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity

Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity

Enhanced catalytic activity for butane isomerization with alumina-promoted tungstated mesoporous zirconia

Olefin isomerization reactions catalyzed by ruthenium hydrides bearing Schiff base ligands

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