Regulating mesopore structures of support toward enhanced selective hydrogenation of dimethyl oxalate to methyl glycolate on Ag catalysts

Regulating pore structures of carbon supports toward efficient selective hydrogenation of o-chloronitrobenzene on Pt nanoparticles

“…The previous reports in literature proved that the longer channels suffered from the unfavorable diffusion resistance. 55,56 Meanwhile, Pt/CMC- T gave rise to a slight decrease in the o -chloronitrobenzene conversion and the targeted product selectivity with the support calcination temperature from 600 to 800 °C. Considering the almost same mesoporosity for the CMC supports, this performance deterioration of catalyst may be caused by the slight growth or partial aggregation of Pt NPs from TEM analysis (Table 1).…”

Engineering an egg-shell structure for the Ag/SiO2 pellet catalyst for selective hydrogenation of dimethyl oxalate to methyl glycolate

“…87-0720) at 38.2°, 44.3°, 64.5° and 77.6°, indicating the presence of metallic Ag species in the catalysts rather than the oxidized ones. 4 Moreover, the intensities of these peaks are similar for all these five catalysts, implying similar Ag nanoparticle sizes. Considering that transmission electron microscopy (TEM) images cannot clearly show the distribution of Ag nanoparticles on the SiO 2 support (Fig.…”

“…[1][2][3] Extensive efforts have been devoted to develop highly efficient catalysts for selective hydrogenation, such as noble Ag-based catalysts and non-noble Cu-based ones. [4][5][6][7][8][9] Among these reported catalysts, Ag-based ones outperform others, especially in terms of selectivity. Notably, these efforts mainly focused on tuning the structures of active sites toward the enhanced catalytic performance of powder catalysts.…”

“…Our previous work has well shown that the diffusion limitation deteriorates the performance of Ag-catalysed DMO hydrogenation to MG while promoting the hydrogenation to ethylene glycol. 4 Improving the diffusion process in the catalysts was shown to be effective for enhancing the accessibility of active sites and thus boosting DMO hydrogenation. 12,13 Inspired by these pioneering studies, it would be promising for enhancing the catalytic performance of particulate catalysts via improving the intra-pellet diffusion process.…”

Zirconium phosphate supported-silver nanoparticles for selective hydrogenation of nitrobenzene into azoxybenzene compounds

“…As a relatively cheap noble metal, silver has rarely been used as the active species in hydrogenation reactions due to its inert nature to the activation of H 2 or other hydrogen donors and its poor stability in air. 16–18 Recently, FeO x -supported Ag particle catalysts showed high activity for NB hydrogenation by modulating the shape and structure of the Ag/FeO x catalyst, which can offer full conversion of NB and good selectivity toward AN within 10 min. 19,20 However, although the supported Ag catalysts have been used for selective hydrogenation of NB, they exhibited moderate activity or selectivity to AOB.…”