Catalytic oxidation of pyridine on the supported copper catalysts in the presence of excess oxygen

In situ synthesis of CuSAPO-34/cordierite and its selective catalytic reduction of nitrogen oxides in vehicle exhaust: The effect of HF

“…3), respectively. The former should be assigned to Cu 2+ in CuO, and the latter can be tentatively assigned to Cu 2 O [34]. The fitting peaks and Cu surface concentrations are given in Fig.…”

“…All the samples present the main and satellite peaks of Cu2 p3/2 (930-938 eV and 940-948 eV, respectively ) as well as the main and satellite peaks of Cu2 p1/2 (950-958 eV and 960-965 eV, respectively ). The Cu2 p3/2 peak around 934.9 eV and the satellite peak around 940-948 eV indicate that the surface copper mainly presents as Cu 2+ (note: the satellite peak is usually used as the characteristic to determine Cu 2+ ), the second Cu2 p3/2 peak around 932.2 eV can be assigned to Cu + due to the related Cu auger spectra at 916.8 eV [34,35]. It agree well with the previous work [33] that the binding energy of metals appear higher values (934.9 eV) when cation has higher valence state (Cu 2+ ) vs 932.2 eV for Cu + .…”

Catalytic Activity of Cu/SBA‐15 for Peroxidation of Pyridine Bearing Wastewater at Atmospheric Condition

“…During pyridine oxidation, many intermediates such as ammonia, dimethylamine, formic acid, acetic acid, glutaconic acid, and oxalic acid may get formed before complete mineralization. 24 The reaction mechanism for the CWPO of pyridine via formation of intermediates is described in Figure 7. Organic acids (acetic acid, formic acid, oxalic acid, and glutaconic acid) were analyzed using ion chromatograph for experimental run conducted at optimum condition (catalyst dose51 g/L, H 2 O 2 dose (30%)52.3 mL/L, temperature5358 K, and initial pyridine concentration5100 mg/L).…”

“…2,3,[24][25][26] Although each technology has its own drawbacks, CWPO is promising technology that has emerged as a feasible substitute technology for the treatment of medium to high organic loading wastewater using hydrogen peroxide as the oxidant.…”

Applications and Preparation Methods of Copper Chromite Catalysts: A Review

“…Both PAHs having 4 rings or more and NPAHs are detected in particulates exhausted from diesel and gasoline-engine vehicles, while PAHs of lower molecular weights (3 rings or below) were detected in the gaseous phase in the atmosphere and unburned diesel fuel [243][244][245]. Copper chrmomite is the active catalyst for the pyridine oxidation and NOx control [246].…”