Enhancing the K-poisoning resistance of CeO2-SnO2 catalyst by hydrothermal method for NH3-SCR reaction

Effect of Preparation Method on the SCR Activity of Fe‐Doped CoCr Oxide Catalysts

“…The position of the desorption peak determined the acid strength, and the area of the desorption peak determined the amount of acid. [49] Among them, the desorption peaks below 250 °C belonged to weak acid sites, those at 250-500 °C to intermediate acid sites, and those above 500 °C to strongly acidic sites. [31,38,49] As shown in Figure 10b, CP-400 had the most weak acid sites, which indicated that Fe 0.5 CoCrO x prepared by coprecipitation method formed more weak acid sites, which improved the absorption and desorption capacity of NH 3 in the low temperature section.…”

“…[49] Among them, the desorption peaks below 250 °C belonged to weak acid sites, those at 250-500 °C to intermediate acid sites, and those above 500 °C to strongly acidic sites. [31,38,49] As shown in Figure 10b, CP-400 had the most weak acid sites, which indicated that Fe 0.5 CoCrO x prepared by coprecipitation method formed more weak acid sites, which improved the absorption and desorption capacity of NH 3 in the low temperature section. [43] Obviously, the total acid content of the catalysts was CA-400 (6.68) > CP-400 (6.33) > SR-400 (4.97) > MM-400 (4.14).…”

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.…”

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO2 Nanocrystals

“…Several methods have been used to synthesize CeO 2 nanocrystals (NCs), e.g., coprecipitation, polymeric precursor, flow method, metalorganic chemical vapor deposition (MOCVD), sol–gel, conventional hydrothermal (CH), , microwave-assisted hydrothermal (MAH)/solvothermal, − etc. CH and MAH methods stand out for enabling ceramic oxide synthesis at low temperatures (below 200 °C), which reduces time and energy consumption .…”