Single catalyst particle diagnostics in a microreactor for performing multiphase hydrogenation reactions

Abstract

Since inter- and intra-particle heterogeneities in catalyst particles are more the rule than exception, it is advantageous to perform high-throughput screening for the activity of single catalyst particles. A multiphase...

Accessibility study of porous materials at the single-particle level as evaluated within a microfluidic chip with fluorescence microscopy

“…9,32,33 Furthermore, the number of particles that can be studied with these methods is very limited. Recently, microfluidic devices have been used to characterize catalysts at the single-particle level in a highthroughput fashion by isolating catalyst particles based on their activity 34 and metal loading. 35 However, this kind of approach has not yet been used to study intra-particle mass transport.…”

Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

“…Slurry catalysts have also been suspended in droplets of the reactant–solvent mixture in (micro)­flow, using an additional immiscible liquid carrier, for catalyzing liquid-phase or gas–liquid reactions. , Nieuwelink et al performed liquid-phase hydrogenation of methylene blue (MB) to Leuco-MB in a microreactor (Table , entry 12). The microreactor has three parallel channels separated by two 50 μm thick polydimethylsiloxane (PDMS) walls with high H 2 permeability.…”

“…However, this suspension state difference did not influence the liquid-phase reaction kinetics obtained, suggesting that for this slow reaction, a sufficient catalyst–reactant contact was still ensured by convection in droplets even in the case of partial homogenization (e.g., particles preferentially located in the bottom hemisphere of droplets; see Figure d). Though the primary focus of these two research reports is on high-throughput catalyst screening, , they provide important insights into solid flow manipulation toward efficiency increase in (gas−)­liquid–solid reactions under suspension catalysis in microreactors.…”

A Novel Bubble‐based Microreactor for Enhanced Mass Transfer Dynamics toward Efficient Electrocatalytic Nitrogen Reduction

“…Over the past decade, microfluidic technology has emerged as an advanced technology for enhancing mass transfer [ 28 ] based on the regulation of bubbles/droplets at the micron scale and has been widely employed in many fields, such as the pharmaceutical, [ 29 ] nanocrystalline, [ 30 ] and dye industries. [ 31 ] Benefiting from the homogeneous microdispersion of materials in the microchannels, a larger interfacial area and decreased mass transfer resistance can be simultaneously achieved, [ 32 ] which contribute significantly to a favorable mass transfer environment.…”