The effect of active sites’ nature on the photo-catalytic performance of Cr-TUD-1 in the oxidation of C1–C3 hydrocarbons

Decomposition of cyclohexyl hydroperoxide over bimetallic mesoporous materials containing cobalt and chromium

“…The most probable reason is that the active site is freed with the removal of depositional contaminations and surface water molecules on the catalysts. Similar phenomena were reported before . The results disclose that the activity of recycled catalysts could recover briefly after recalcination.…”

“…The band at 360 nm due to electron transition of the tetrahedrally coordinated isolated Cr 6+ disappears and the band at 265 nm is weakened, indicating the decrease of Cr 6+ content in TUD‐1 after reuse. A band at 600 nm associated with the presence of octahedral Cr 3+ appears, which is most likely attributed to the reduction from Cr 6+ to Cr 3+ . In other words, it is possible that Cr is partially leached in the reaction.…”

“…Similar phenomena were reported before. [40,43] The results disclose that the activity of recycled catalysts could recover briefly after recalcination.…”

“…A band at 600 nm associated with the presence of octahedral Cr 3þ appears, which is most likely attributed to the reduction from Cr 6þ to Cr 3þ . [25,40] In other words, it is possible that Cr is partially leached in the reaction. H 2 -TPR spectra of reused samples are shown in Figure 10.…”

Solvent-free hydrogenation of cyclohexene over Rh-TUD-1 at ambient conditions

“…The synthesis was carried out by one-pot synthesis procedure based on sol-gel technique very similar to the synthesis method which was reported earlier by Hamdy and coworkers. [18][19][20] The activity of the prepared catalyst was investigated in the liquid phase, room temperature (298 K) and ambient pressure hydrogenation of cyclohexene. The stability and reusability were also investigated.…”