Thiophene HDS on La-Modified CoMo/Al2O3 Sulfided Catalysts. Effect of Rare-Earth Content

Visible‐Light‐Driven One‐Pot Synthesis of Benzimidazoles, Benzothiazoles, and Quinazolinones Catalyzed by Scalable and Reusable Ba‐Doped CoMoO4 Nanoparticles Under Air Atmosphere

“…The UV‐Vis absorption spectra of pure and 0.9 % Ba doped CoMoO 4 nanostructures are shown in Figure 3a. The broad absorption band in the UV region at around 300–350 nm could be related to the ligand O 2− to metal Mo 6+ atom charge transfer transition bands of tetrahedral and octahedral molybdenum species inside the (MoO 4 ) 2− group [36a] . Besides high absorption in the near ultraviolet region, CoMoO 4 exhibits absorption band at 580 nm in the visible region corresponding to triplet band related 4 A 2 (F)→ 4 T 1 (P) transition of tetrahedral cobalt [36b] .…”

2-Propanol dehydration and dehydrogenation on Pt/Al2O3 and Pt/Al2O3-CeO2 catalysts

“…Sample AC2 presents similar FTIR spectra to alumina. The main difference is the presence of a signal at 2347 cm −1 , which is attributed to C-O bond vibrations of adsorbed CO 2 , indicating the existence of basic sites (Escobar et al 2020), which are related with the presence of ceria. As in the case of alumina, the low energy spectrum was also not well defined.…”

Acid‐Base Synergistic Catalysis over Zn/Al Layered Double Oxides toward the Hydrolysis of Ethyl Carbonate under Mild Conditions

“…The in-situ CO 2 -DRIFTS can analyse the changes of base sites before and after the reaction through CO 2 adsorption studied in the mid-infrared region. [42,43] As an acid probe, CO 2 can interact…”

“…Due to the poor thermal stability of LDHs or recycled‐LDOs causes them to decompose easily at high temperature, the base sites change could not be characterized by conventional CO 2 ‐TPD because of the damage to the TCD detector or large error. The in‐situ CO 2 ‐DRIFTS can analyse the changes of base sites before and after the reaction through CO 2 adsorption studied in the mid‐infrared region [42,43] . As an acid probe, CO 2 can interact with base sites on surface of catalyst.…”