Exploring Opportunities for Platinum Nanoparticles Encapsulated in Porous Liquids as Hydrogenation Catalysts

Abstract

The unusual combination of characteristics observed for porousl iquids, which are typicallya ssociatedw ith either porous solids or liquids, has led to considerablei nterest in this new class of materials. However,t hese porous liquids have so far only been investigated for their ability to separate ands tore gases.H erein, the catalytic capability of Pt nanoparticles encapsulated within aT ype Ip orousl iquid (Pt@HS-SiO 2 PL)i se xplored for the hydrogenation of several alkenesa nd nitroarenes under mild conditions (T = 40 8C, P H2 = 1atm). The different intermediates in the porousl iquid synthesis (i.e.,t he initial Pt@HS-SiO 2 ,t he organosilane-func-tionalized intermediate, andt he final porousl iquid)a re employeda sc atalysts in order to understand the effect of each component of the porous liquid on the catalysis. For the hydrogenation of 1-decene, the Pt@HS-SiO 2 PL catalysti ne thanol has the fastestr eactionr ate if normalized with respect to the concentrationo fP t. The reaction rate slows if the reactioni sc ompleted in a" neat" porous liquid system,p robably because of the high viscosity of the system.T hese systems may find application in cascade reactions, in particular, for those with mutually incompatible catalysts.

Shining Light on Porous Liquids: From Fundamentals to Syntheses, Applications and Future Challenges

“…After this initial evaluation, in another study, Maschmeyer et al investigated the catalytic capability of Pt@HS-SiO 2 PL for the hydrogenation of several alkenes and nitroarenes. [70] As expected, compared with Pt@HS-SiO 2 and OS-(Pt@HS-SiO 2 ), the most active catalyst for the hydrogenation of 1-decene is the Pt@HS-SiO 2 PL. Additionally, it was found that PLs could be recycled at least twice, confirming the recyclability and stability (Figure 23c).…”

“…(Reproduced with permission. [70] Copyright 2020, Wiley). d) Schematic illustration of the formation and stabilization of PdNPs in C 4 R COCs PL for photocatalytic hydrogen evolution.…”

“…c) Conversion of 1-decene for Pt@HS-SiO 2 SiO 2 PL (EtOH), and Pt@HS-SiO 2 PL (KPEGS), at 40 and 1 atm H 2 . (Reproduced with permission [70]. Copyright 2020, Wiley).…”

Oscillating droplet reactor – towards kinetic investigations in heterogeneous catalysis on a droplet scale

“…Such pseudo-zeroorder reactions can be observed in certain concentration ranges at high reactant concentrations in heterogeneously catalysed reactions. 27 However, despite the slight deviations of the fitted concentration from the measured concentration profile, a first-order reaction can still be applied in the case of the hydrogenation carried out at 0.4 MPa. This is also confirmed by the fact that the k 0.40MPa /k 0.25MPa ratio of 1.61 corresponds very well with the calculated pressure ratio of 1.6.…”

Type II porous ionic liquid based on metal-organic cage that enables L-tryptophan identification

“…Their modular nature and structure diversity facilitate the exquisite control over porous liquids with respect to the pore size and chemistry through the judicious selection of structural constituent. Such versatile porosities thereby enable systematic studies that afford an understanding of structure-function relationships of porous liquids, which has led them to be of particular interest for potential utility in gas storage [8][9][10][11][12][13][14][15][16] , separations [17][18][19][20] and catalysis [21][22][23] .…”