Enhancement of catalytic activity in NH3-SCR reaction by promoting dispersibility of CuCe/TiO2-ZrO2 with ultrasonic treatment

Ultrasonic-assisted preparation of ultrafine Pd nanocatalysts loaded on Cl−-intercalated MgAl layered double hydroxides for the catalytic dehydrogenation of dodecahydro-N-ethylcarbazole

“…However, stabilizers may be adsorbed on the active surface, and removing the stabilizer will not only destroy the structure and morphology of nanoparticles, but also produce pollution such as wastewater, exhaust gas and toxic byproducts [35] , [36] . Therefore, other new and green reduction methods have also emerged and been applied, such as thermal reduction [37] , plasma reduction [38] , microwave-assisted reduction [39] , [40] and ultrasonic-assisted reduction [41] , [42] . Among them, the ultrasonic-assisted method is simple and easy to control in operation, which has potential application prospects in industry.…”

Ultrasound-excited hydrogen radical from NiFe layered double hydroxide for preparation of ultrafine supported Ru nanocatalysts in hydrogen storage of N-ethylcarbazole

“…In addition, a suitable preparation method is the key to the preparation of ultrafine nanocatalysts with excellent catalytic performance. The preparation methods of supported nanocatalysts mainly include traditional chemical reduction methods [24] and new reduction methods, such as thermal reduction method [25] , plasma reduction method [26] , microwave-assisted reduction method [27] and ultrasound-assisted reduction method [28] , [29] , [30] . Traditional chemical reduction methods usually require a large number of surfactants and stabilizers to prevent agglomeration of nanoparticles to prepare ultrafine nanocatalysts with high dispersibility.…”

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO2–ZrO2 catalyst for a low temperature NH3-SCR system

“… 26 For Cu/TiO 2 –ZrO 2 and CuCe/TiO 2 –ZrO 2 catalysts, there are several diffraction peaks ascribed to CuO crystal structure locate at 32.5°, 35.6°, 38.7°, 48.8°, 53.4°, 58.2°, 61.6°, 66.3°, 68.0°, 72.3°, and 75.2° (PDF# 89-2529). 27 Furthermore, the peak intensity of CuCe/TiO 2 –ZrO 2 is weaker than that of Ce/TiO 2 –ZrO 2 and Cu/TiO 2 –ZrO 2 . Thus, it can be concluded that there is strong interaction between CeO 2 and CuO species, and the Cu and Ce active components are dispersed well on the CuCe/TiO 2 –ZrO 2 catalyst surface.…”

“…In order to explain the reasons of high NO conversion over CuCe/TiO 2 -ZrO 2 catalyst at low temperature interval, XRD, SEM and XPS characterization tests were carried to study textural, morphological and redox properties of the catalysts, and the DRIFTS studies combined with DFT calculations were developed to further explore the adsorption and reaction mechanism of NH 3 and NO on CuCe/TiO 2 -ZrO 2 catalyst. 27 Furthermore, the peak intensity of CuCe/ TiO 2 -ZrO 2 is weaker than that of Ce/TiO 2 -ZrO 2 and Cu/TiO 2 -ZrO 2 . Thus, it can be concluded that there is strong interaction between CeO 2 and CuO species, and the Cu and Ce active components are dispersed well on the CuCe/TiO 2 -ZrO 2 catalyst surface.…”