ChemInform Abstract: Oxidative Dehydrodimerization of Propylene Over a Bi2O3‐La2O3 Oxide Ion‐Conductive Catalyst

Cosimo, R. Di; Burrington, James D.; Grasselli, Robert K.

doi:10.1002/chin.198707137

Cited by 7 publications

(7 citation statements)

References 1 publication

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“…In addition to their important role in sensor technology [1][2][3] and solid oxide fuel cells, [4][5][6] O 2-conductors, such as Y 2 O 3 -stabilized-ZrO 2 (YSZ), play an increasingly important role in heterogeneous catalysis both as nanodispersed catalyst carriers [7][8][9] and as supports of thick or thin electrochemically promoted films .…”

Section: Electrochemical Promotionmentioning

confidence: 99%

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

2011

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The electrochemical promotion of Rh/YSZ catalysts for C 2 H 4 oxidation was investigated together with the mechanism of electrochemical promotion via the use of AC impedance spectroscopy. The impedance response consists of two distinct semicircles and provides strong support for the sacrificial promoter mechanism of electrochemical promotion. The impedance analysis of the low frequency part of all spectra show the existence of a finite length Gerischer impedance which corresponds to the effective double layer formed by the spillover of promoting anionic oxygen from the YSZ support to the rhodium/gas interface and its slow consumption there by adsorbed hydrocarbon fragments. AC impedance analysis provides values both for the rate of consumption of the promoting spillover oxygen species as well as for the stability and capacitance the catalyst/gas double layer in various gaseous environments and temperatures.

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Section: Electrochemical Promotionmentioning

confidence: 99%

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

2011

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“…In selective oxidation of hydrocarbons, the typical Mars and Van Krevelen redox mechanism may be decoupled by performing the two steps separately [5], so that conditions for each one can be optimized. This may be done by using a circulating bed reactor [6], a periodical feed reactor or a catalytic dense membrane reactor (CDMR) [7,8].…”

Section: Introductionmentioning

confidence: 99%

Oxygen permeation versus catalytic properties of bismuth-based oxide ion conductors used for propene oxidation in a catalytic dense membrane reactor

et al. 2004

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“…The catalytic dense membrane reactor (CDMR) is a means to study and to optimize the catalytic behaviour of oxides, because it allows decoupling the two steps of the redox mechanism that prevails in the selective oxidation of hydrocarbons [1][2][3][4]. One can expect an increase in selectivity to valuable products if oxygen is not co-fed with the hydrocarbon, as has already been demonstrated by DuPont for n-butane oxidation to maleic anhydride in a circulating fluid bed reactor [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Selective oxidation of hydrocarbons in a catalytic dense membrane reactor: Catalytic properties of BIMEVOX (Me=Ta)

et al. 2006

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Used as dense membranes in a catalytic dense membrane reactor, Bi 2 V 0.8 Ta 0.2 O 5.5 (BITAVOX) is more or less active in the oxidation of propane, ethane and propene according to its surface roughness. When the surface roughness is low, membranes are poorly active in the oxidation of propane (conversion <2%). CO and propene are the main products and the stability is high over long experimental periods. BITAVOX membranes with increased surface roughness exhibit high conversions in the oxidation of propane, ethane and propene. Activities and selectivities evolve with time. In a first short period (<250 s), the products are similar to those of polished samples, then mainly H 2 and CO are produced and subsequently H 2 and coke. These evolutions are probably related to surface and sub-surface restructuring due to an insufficient oxygen supply through the membrane to face the high catalytic activity induced by the increase in surface area. The results suggest that the O 2À diffusion is limited by the low electronic conductivity of BIMEVOX materials. Nevertheless the membrane is not reduced irreversibly, even in coking conditions. This is confirmed by ex situ characterisations carried out on the materials (XRD, SEM, XPS). An improvement of the electronic conductivity of this material is necessary in order to stabilize the intermediate catalytic behaviour which is interesting for syngas or H 2 production from light hydrocarbons. #

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ChemInform Abstract: Oxidative Dehydrodimerization of Propylene Over a Bi2O3‐La2O3 Oxide Ion‐Conductive Catalyst

Abstract: 137ChemInform Abstract (formation of 1,5-hexadiene and benzene at 600 rc C and atmospheric pressure; use of a catalyst disk where reoxidation occurs by lattice oxide migration).

Cited by 7 publications

References 1 publication

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

Oxygen permeation versus catalytic properties of bismuth-based oxide ion conductors used for propene oxidation in a catalytic dense membrane reactor

Selective oxidation of hydrocarbons in a catalytic dense membrane reactor: Catalytic properties of BIMEVOX (Me=Ta)

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