Stabilizing copper species using zeolite for ethanol catalytic dehydrogenation to acetaldehyde

Ethanol Dehydrogenation: A Reaction Path Study by Means of Temporal Analysis of Products

“…An important topic with respect to catalysts for ethanol dehydrogenation is the significant deactivation that occurs due to coke formation on the catalyst surface and the sintering of the active catalyst particles. This was found in the case of PdZn nanoparticles [28], monometallic Cu [29,30], bi-or tri-metallic Cu alloys [29,[31][32][33], SiO 2 − supported Cu catalysts [34] and V/Mg − Al catalysts [35,36]. There is a considerable number of papers that use computational methods such as density functional theory or a combination of experimental methods and modelling tools to investigate correlations between catalyst activity and selectivity on the one hand and material characteristics such as crystal faces, monolayer coverages, etc., on the other [37][38][39][40][41].…”

Zinc oxide-modified mordenite as an effective catalyst for the dehydrogenation of (bio)ethanol to acetaldehyde

“…64 It must be noted, however, that some modern preparation methods may lead to Cu based systems with comparable stabilities to ZnO (3.5)/Rb-MOR-(7) reported herein, e.g. a Cu-BEA with a stable lifetime of 100 h, 32 and a highly dispersed Cu/SiO 2 prepared by ammonia evaporation with a lifetime of 500 h. 65 Additionally, copper on calcium silicate catalysts have been reported to exhibit a remarkably stable acetaldehyde production, however the longest recorded reaction duration was 20 h. 66 Finally, ZnO (3.5)/Rb-MOR-(7) may present a desirable alternative to commercial copper chromite catalysts (e.g. BASF Cu-1234-1/16-3F 67 and BASF 0203T 66 ) for the synthesis of acetaldehyde from ethanol.…”

“…[27][28][29][30][31] In particular, zeolite and porous silica materials have become an area of considerable interest as favourable supports for metal species owing to their ability to stabilize metal ions and direct metal cluster size. 24,[32][33][34][35][36] One such example is the direct production of acetaldehyde from ethanol over Fe-exchanged mordenite (Fe-MOR) zeolites prepared by both solution-state and solid-state ion-exchange methods. 36 In this report, acetaldehyde was formed with 7-25% selectivity over Fe-MOR materials at reaction temperatures between 200 to 400 C. Notably, an acetaldehyde selectivity of 79% was reported at a reaction temperature of 100 C over an Fe-MOR catalyst prepared by solid-sate ion-exchange, albeit at very low ethanol conversion values (0.72%).…”

Optimizing zeolite stabilized Pt-Zn catalysts for propane dehydrogenation

“…To disperse and stabilize Pt-based bicomponent species for PDH, high-surface-area supports with abundant surface hydroxyls such as Al 2 O 3 [9][10][11]18] or SiO 2 [19][20][21] are most widely used. In our previous work, bicomponent Pt-Sn species stabilized by Si-Beta zeolite has been established as a good catalyst for the oxidative dehydrogenation of propane (ODHP) [22], which exhibited high propylene productivity and good stability due to the confinement effects of Si-Beta [23][24][25].…”