Structured catalytic wall microreactor for efficient performance of exothermic reactions

Hydrogen Peroxide Decomposition on Manganese Oxide Supported Catalyst: From Batch Reactor to Continuous Microreactor

“…In particular, a list of these catalysts includes different metals such as platinum, silver, cobalt, palladium, and manganese, − as well as different oxides and salts. , Manganese oxides, in particular, have shown the greatest activity in promoting this reaction. − As mentioned before, the use of a heterogeneous catalyst is particularly favorable for continuous operations. Moreover, this operation could be advantageously intensified by using microreactors with a catalytic coating deposited on their walls. − The two dominant methods of embedding a heterogeneous catalyst in a microflow reactors is by coating the walls [with wash-coating being the most prominent technique, although physical vapor deposition (PVD), , chemical vapor deposition (CVD), , sol–gel processing, ,− and others are also used] and by forming small, preferably uniform, beads or grains into a tight assembly, which constitutes a mini-fixed reactor with open voids whose internal dimensions are commonly in the micrometer range and form a three-dimensional channel network. These concepts represent generically different ways to overcome heat- and mass-transfer limitations and to cope with pressure loss and residence time distributions, and the manufacture of such catalysts, on an industrial scale, is also projected to have very different costs.…”

“…The objectives of this research were to determine the best operating conditions, catalyst stability, kinetic law equation, and related kinetic parameters. Then, after the best catalyst recipe had been identified, we deposited a catalytic coating of the same composition on microchanneled stainless steel plates by the wash-coating technique. − The obtained coating was characterized in depth to evaluate its consistency and resistance. − Finally, the walls of a microreactor, appropriately designed to favor local mixing, were coated with the best catalyst and tested in a continuous run of hydrogen peroxide decomposition. The kinetic law, derived from batch runs, was successfully used to simulate the performance of the microreactor by operating under a moderate pressure (0.4–0.5 MPa) and reduce the volume of oxygen developed inside the reactor.…”

Selective Alkyne Hydrogenation over Nano-metal Systems: Closing the Gap between Model and Real Catalysts for Industrial Applications

“…Therefore, we adopted the concept of 'slit microreactor'. [27] The novel design as a structured catalytic wall microreactor (SWMR) allows the reaction mixture to flow through an empty micro-slit above a structured catalyst along the wall of the reactor (Fig. 5).…”

Ionic Liquids within Microfluidic Devices

“…Catalytic activity and yields were found to be relatively high for the Cu (II) complexes as compared with those obtained with conventional bulk scale epoxidation. Recently, ionic liquid was employed in a structured catalytic wall microreactor suitable for highly exothermic heterogeneous gas/solid reactions (Kiwi-Minsker et al, 2010). Pd°-nanoparticles embedded in an ionic liquid and deposited on activated carbon fibers with high specific surface area were used as a structured catalyst.…”