Microreactor technology in experimental and modelling study of alcohol oxidation on nanogold

Towards unconstrained catalyst shaping: high accuracy DLP printing of porous γ-Al2O3-based catalysts

“…6c) and dependence of selectivity on conversion is in complete agreement with previous studies on a similar catalyst carried out in a microreactor unit. 5 On this catalyst, formation of diethyl ether was almost completely suppressed (Fig. 6b) but, at the same time, ethanol dehydration to form ethylene appeared as a significant side reaction.…”

Selective vapor-phase formation of dimethylformamide via oxidative coupling of methanol and dimethylamine over bimetallic catalysts

“…Two possible explanations for the observed increase in DMF selectivity are: first, hydroxyl groups from excess water recombine and leave behind atomic oxygen on Au where selective oxidation reactions occur 22,[41][42][43][44]48 and second, hydroxyl groups occupy Pd-O sites that form in oxidant-rich conditions. Since palladium oxide catalyzes complete combustion of methanol, 78 mobile hydroxyl groups formed from water could occupy sites for complete oxidation, leading to the observed increase in DMF selectivity.…”

“…The effect of coadsorbed O/OH species are considered as they may assist with dehydrogenation steps and lower the reaction barrier. 48,91 Species that are bound to the surface are indicated with * and adsorption/desorption steps are not shown. (-H)*) as shown in Fig.…”

“…47 Another possible mechanism for supplying oxygen adatoms to Au surfaces is by water-facilitated migration. [40][41][42][43][44]48 In this mechanism, water adsorbs to the surface and dissociates to Scheme 2 Illustration of proposed surface reactions reported for the oxidative cross-coupling of methanol and dimethylamine on a dilute Ag in Au alloy surface. 27 Catalysis Science & Technology Paper supply a surface hydrogen to an oxygen atom already present on the surface, typically originating from O 2 dissociation at the Ausupport interface 45 or unintentional metal impurities 37,38 and resulting in two mobile surface hydroxyl groups.…”

Experimental determination and mathematical modelling of residence time distributions by using pieces of urban art

“…The recent development of new reactor and catalyst structures, such as monoliths, solid foams, microreactors and 3D-printed structures has caused a renaissance of this subfield of chemical reaction engineering, because it is absolutely necessary to know the flow pattern and RTD for each new reactor and catalyst structure, in order to progress successfully with rational modelling of reaction kinetics, transport phenomena and flow pattern (Stankiewicz and Moulijn 2000;Hessel et al, 2004;Mastroianni et al, 2022;Shumilov et al, 2022). Besides the classical experiments with pulse and step wise added inert tracers, modern tomographic methods are of great help in research and development of new reactor systems.…”