Facile synthesis of an ultramicroporous MOF tubular membrane with selectivity towards CO(2)

International audienceA substituted imidazolate-based MOF (SIM-1) membrane has been crystallized in situ on a tubular asymmetric alumina support that can be exploited for gas separation through preferential adsorption

Tests for the Use of La2Mo2O9-based Oxides as Multipurpose SOFC Core Materials

International audienceThe mixed ionic-electronic conductivity under dilute hydrogen, the stability and the catalytic activity under propane:air type mixtures of a series of LAMOX oxide-ion conductors have been studied. The effect of exposure to dilute hydrogen on the conductivity of the -La2(Mo2 - yWy)O9 series at 600 °C depends on tungsten content: almost negligible for the highest (y = 1.4), it is important for La2Mo2O9 (y = 0). In propane:air, all tested LAMOX electrolytes are stable at 600-700 °C, but get reduced when water vapour is present. La2Mo2O9 is the best oxidation catalyst of the series, with an activity comparable to that of nickel.The catalytic activity of other tested LAMOX compounds is much lower, (La1.9Y0.1)Mo2O9 showing a deactivation phenomenon. These results suggest that depending on composition, La2(Mo2 - yWy)O9 compounds could be either electrolytes in single-chamber SOFC and dual-chamber micro-SOFC (y = 1.4) or anode materials in dual-chamber SOFC (low y) or oxidation catalysts in SOFCs operating with propane (y = 0)

Fabrication of an Active Electronic Device Using a Hetero-bimetallic Coordination Polymer

A nickel(II)/lead(II) coordination polymer [(NCS)Pb(H2O)LNi(NCS)]n {H2L=N,N′-bis(3-methoxysalicylidene)propane-1,3-diamine} has been synthesized and characterized. The band gap (3.18 eV) calculated from Tauc’s plot suggests the semiconducting nature of the complex. The material has a photosensitivity of 5.76, indicating its applicability in the fabrication of photosensitive devices. The complex has been successfully applied in a technologically challenging thin-film photosensitive Schottky device

Templated non-oxide sol-gel preparation of well-ordered macroporous (inverse opal) Ta3N5 films

Reactions of Ta(NMe2)5 and n-propylamine are shown to be an effective system for sol-gel processing of Ta3N5. Ordered macroporous films of Ta3N5 on silica substrates have been prepared by infiltration of such a sol into close-packed sacrificial templates of cross-linked 500 nm polystyrene spheres followed by pyrolysis under ammonia to remove the template and crystallize the Ta3N5. Templates with long-range order were produced by controlled humidity evaporation. Pyrolysis of a sol-infiltrated template at 600 °C removes the polystyrene but does not crystallize Ta3N5, and X-ray diffraction shows nanocrystalline TaN plus amorphous material. Heating at 700 °C crystallizes Ta3N5 while retaining a high degree of pore ordering, whereas at 800 °C porous films with a complete loss of order are obtained

Key Note: High Throughput Screening Strategies. From library design to material design

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All porous solid oxide fuel cells (AP-SOFC): a bridging technology between dual and single chambers for operation in dry hydrocarbons

International @ INGENIERIE+DFAInternational audienceThe anode deactivation by coking for hydrocarbon-feed SOFC is a chief obstacle towards industrialization. All Porous Solid Oxide Fuel Cell (AP-SOFC) is the latest technology allowing the controlled distribution of gaseous O2 at anode side, thus preventing deactivation and generating heat by auto-thermal reforming. The oxygen distribution is controlled by the porosity of a CGO electrolyte. In this AP-SOFC, the oxidative reforming of hydrocarbon streams consequently operate in a similar fashion to single chamber SOFC, but within a safer and better controlled process [1]. In our first electrolyte supported AP-SOFC, the peak power output only reached ~20 mW cm-2 with methane as fuel due to the large thickness of the porous electrolyte (2 mm). In this study, we show a 10-fold peak power output using a second generation AP-SOFC based on anode-supported porous thin-film CGO electrolyte (Fig. 1). In single cell test, stable OCV of 0.82V was obtained over 160 hours (Fig. 2). Moreover, continuous and stable operation in dry 6% propane for more than 120 hours without observable degradation in OCV was obtained, whereas the cell performance degraded almost 35% for dual chamber SOFC with dense CGO electrolyte only after 10 hours [2]

High-throughput heterogeneous catalysis

Farrusseng, DavidThis comprehensive review of the literature (over 250 references) deals with high-throughput experimentation in heterogeneous catalysis. Approaches to library design for catalyst discovery and optimization are described and discussed. Special focus is placed on advanced methods for knowledge discovery such as high-throughput kinetic modeling and QSAR. An inventory of successful case studies in catalysis is reported. Finally, recent developments in relevant electronic data and knowledge management are described. (C) 2008 Published by Elsevier B.V