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SSCI-VIDE+ING+DLP:ATU:DFA:FRM; International audience; Undesired metal nanoparticles located outside zeolite nanoboxes (hollow zeolites) can be formed during the preparation of zeolite-embedded metal nanoparticles. The present work demonstrates that it is possible to use citric acid to selectively leach outmost of the external Ni nanoparticles from a Ni@silicalite-1 material. The leached sample exhibited an improved selectivity in the hydrogenation of toluene as compared to that of the bulkier mesitylene. (C) 2017 Elsevier B.V. All rights reserved.

International audience; This paper presents a series of applications of catalytic membrane reactors (CMR) to oxidation reactions. Four reactions were tested in our group. Alkane activation (C2, C3 and C4) or total oxidation (WAO) is implemented in various membrane reactor modes, using dense, microporous or mesoporous membranes. In some cases, a catalyst bed is associated with a membrane, whereas other applications use an intrinsically active membrane. Progresses in catalyst and membrane design, along with careful operational conditions led to overall higher performances when compared to conventional processes.

New Cu-free non-pyrophoric catalytic materials have been discovered for the water–gas shift reaction (WGSR) by high-throughput experimentation applying an evolutionary search strategy. Two approaches were applied for the design of experiments: (1) the amount of Cu in the composition was not restricted; as expected from common knowledge Cu containing catalysts were superior within the given parameter space. (2) By allowing only a maximum Cu content of 1 wt.% in the second approach new Cu-free materials were discovered. The new compositions contained mainly oxides of Cr or Fe along with Mn and Pt on ZrO2 as support material. A maximal activity for WGSR was achieved at 250 °C (CO conversion of 55%); the feed composition amounted to 3% CO, 37% H2, 14% CO2, 23% H2O, Ar balance and the GSHV to 3000 h−1.