Bimetallic nanosized solids with acid and redox properties for catalytic activation of C–C and C–H bonds

Abstract

A conceptually new formation of bimetallic nanosized solids with acid and redox properties for catalytic C–C and C–H activation is presented.

Synthesis of Supported Planar Iron Oxide Nanoparticles and Their Chemo- and Stereoselectivity for Hydrogenation of Alkynes

“…The n FeOx-supported catalysts developed here may catalyze the semihydrogenation of acetylene within the parameters of activity and selectivity required industrially and, potentially, circumvent CO poisoning due to the cationic nature of Fe Figure shows that, indeed, n FeOx-TiO 2 (7.0 wt % Fe) operates in flow to reduce the amount of acetylene on stream from 1% (10000 ppm) to <100 ppm with <0.2% of ethane generated.…”

Ag supported on alumina for the epoxidation of 1-hexene with molecular oxygen: the effect of Ag+/Ag0

“…11 The direct epoxidation of linear terminal alkenes using O 2 is a “dream reaction” in heterogeneous catalysis, but the selective oxidation to epoxides is rather challenging. The presence of two active bonds in the molecule makes the oxidation take place at either the active CC double bond or the nearby C–H bond, 12,13 resulting in epoxides or the allylic oxidation products. The epoxides can be hydrolyzed to 1,2-diols with residual H 2 O, then further oxidized to intermediates and finally CO and CO 2 .…”

Acid Catalysis with Alkane/Water Microdroplets in Ionic Liquids

“…The extended framework of a typical ionic liquid (IL) neutralizes the innate ion charge separation between the cation, typically ammonium of general formula R 4 N + , and the anion, typically a highly delocalized perfluorinated counteranion XF n – [i.e., BF 4 – , PF 6 – , or TFSI – (bis­(trifluoro­methane­sulfonyl)­imide)], thus keeping the material neutral and without acidity. − In stark contrast, the corresponding perfluorinated Brönsted acids and also the metal salts prepared thereof by halide metathesis, with general formula MXF n , show some of the higher acidity values recorded so far, active as superacid catalysts (pH < H 2 SO 4 ) in organic reactions. − In order to use the IL as an acid catalyst and a solvent, additional chemical modifications if not the partial decomposition of the IL have been reported, such as the generation of protons by partial hydrolysis, − the addition of metal nanoparticles or external acids, − and the incorporation of sulfonic, carboxylic, and metal anion functions into the IL chemical structure, which have been named Brönsted (BAILs) and Lewis acidic ionic liquids (LAILs), respectively . However, all these strategies require the permanent modification of the original IL structure, increasing significantly the costs for the acid function synthesis and just overlooking the innate acidity of ILs.…”