Performance of alkali modified Pd/Mg(Al)O catalysts for hydrodechlorination of 1,2,4-trichlorobenzene

Particle size effect in methane activation over supported palladium nanoparticles

“…During reduction in H 2 , noble metals such as Pd segregate out of the mixed-oxide matrix to form welldefine nanoparticles, whose size tends to depend on metal loading. PdMgAl hydroxycarbonates have already been studied by several groups and were found to be active in phenol hydrogenation, oxidation of toluene, acetone condensation, hydrodechlorination of 1,2,4trichlorobenzene and total oxidation of methane [5][6][7][8][9].…”

A mild route to solid-supported rhodium nanoparticle catalysts and their application to the selective hydrogenation reaction of substituted arenes

“…The time evolution of the reaction products detected in the two instances is shown in graphical format in Fig. 65 Assuming that Rh@D400Li + in is the most efficient of the prepared catalyst in the hydrogenation of arenes, we then extended our study to the hydrogenation reaction of other substituted monocyclic arenes. In agreement with findings discussed in the previous section, the partial hydrogenation of 5 to give ethylbenzene (5a) was 3.5fold faster for Rh@D400H + (100% conversion after 40 minutes), compared to Rh@D400Li + in (2 hours, including the usual induction period).…”

“…64 A similar behaviour was described for the hydrodechlorination reaction of 1,2,4-trichlorobenzene by PdNP onto alkalimodified hydrotalcite. 65 Assuming that Rh@D400Li + in is the most efficient of the prepared catalysts in the hydrogenation of arenes, we then extended our study to the hydrogenation reaction of other substituted monocyclic arenes. Selected data obtained under mild reaction conditions are summarized in Table 4, wherein selectivity to the indicated products and TOF values calculated at ≥95% conversions are reported for comparative purposes.…”

Application of supported metallic catalysts in catalytic hydrogenation of arenes

“…There should be no bridge between H 2 and the spillover hydrogen without Pt in the vicinity of the acid sites, and the arene hydrogenation could not take place in the absence of Pt. [110][111][112][113] Brønsted acids, the main acid species of zeolites, were strong enough to resist sulfur and to enhance the catalytic activity of supported-metals for arene hydrogenation along with the severe product coking or cracking. Weak acid supports, mainly Lewis acid sites, showed a high selectivity for hydrogenated products and a low yield of coked or cracked products.…”