Boosting COS catalytic hydrolysis performance over Zn-Al oxide derived from ZnAl hydrotalcite-like compound modified via the dopant of rare earth metals and the replacement of precipitation base

The influence of H2O or/and O2 introduction during the low-temperature gas-phase sulfation of organic COS + CS2 on the conversion and deposition of sulfur-containing species in the sulfated CeO2-OS catalyst for NH3-SCR

“…24,50 Meanwhile, the low-temperature gas-phase sulfation of organic COS + CS 2 makes the binding energies attributed to the Ce 3d XPS spectra of CeO 2 catalyst shift to the left by reducing the electron cloud density around cerium ions via the interaction between the formed sulfate species and cubic fluorite CeO 2 . 51,52 Zhang et al pointed out that the doping of P element also led the binding energy of Ce 3d XPS spectra shift to higher value due to the electronic excitation effect of P and Ce ions on CeO 2 surface. 53 From Table 2, it can be found that the introduction of H 2 O or O 2 during the gasphase sulfation effectively improves the calculated molar ratio of Ce 3+ /(Ce 3+ + Ce 4+ ) on the sulfated CeO 2 -OS surface although it decreases the formed quantity of sulfur-containing species.…”

Promotional effect of H2O introduction on the NH3-SCR activity of the gas-phase sulfated CeO2 catalyst by organic CS2+COS: Influence of H2O concentration

“…Among them, u' and v' are attributed to Ce 3+ species (3d 10 4f 1 ), and the other peaks are ascribed to the Ce 4+ electronic state (3d 10 4f 0 ) [49]. In addition, the low-temperature gas-phase sulfation of organic CS2+COS increases the molar ratio of Ce 3+ /(Ce 3+ +Ce 4+ ) on CeO2 surface and makes the Ce 3d spectra of catalyst shift to a higher binding energy direction by approximately 0.6 eV, indicating the electron-induced effect between Ce, O and S species, which alters the electron cloud density around Ce [70,71]. Interestingly, the introduction of H2O improves this electron-induced effect and further increases the molar ratio of Ce 3+ /(Ce 3+ +Ce 4+ ) on CeO2-CS2+COS surface.…”

Boosted Photocatalytic Activity of Zn/Al‐Based Layered Double Hydroxides Through Cobalt Incorporation for Phenol Degradation

“…[16] Despite not being considered semiconductors based on their band gap energy, they have demonstrated the capability to degrade organic compounds. [17] The most studied hydrotalcites are those containing Mg, Zn, and Al in their structure and have shown high degradation capacity for azo-like dyes. However, due to the degradation of persistent organic compounds, it has been necessary to use doping agents to improve their photocatalytic performance.…”

“…Although the calcination process can destroy or modify the LDH structure, this material can recover its original structure when it is exposed to a medium containing water and anions, a phenomenon known as “memory effect” [16] . Despite not being considered semiconductors based on their band gap energy, they have demonstrated the capability to degrade organic compounds [17] . The most studied hydrotalcites are those containing Mg, Zn, and Al in their structure and have shown high degradation capacity for azo‐like dyes.…”