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Desorption-dominated synthesis of CuO/SBA-15 with tunable particle size and loading in supercritical CO2.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Desorption-dominated synthesis of CuO/SBA-15 with tunable particle size and loading in supercritical CO2."

Here, we present a novel method to control the size of the CuO nanoparticles (NPs) and Cu loading in SBA-15 via fast desorption of supercritical CO2 (scCO2). After calcination, the average size of the CuO nanoparticles (6.47±2.89~2.18±0.97 nm) decreased with the increase of depressurization rate (20-14 MPa, 50 °C) from transmission electron microscopy (TEM), and the x-ray diffraction (XRD) results also indicated the decrement of the average particle size (8.6~4.3 nm by Scherrer equation). Two reduction peaks situated at 195 °C and 220 °C were found from the temperature-programmed reductions (TPR) with H2 profiles, and the intensity of the low-temperature peak increased with increasing the rate for a profile. The hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG) was selected to evaluate the catalytic activity of the as-prepared sample. The reaction was conducted at p = 3.0 MPa, T = 200 °C, H2/DMO = 120 and WHSV = 1.2 h-1, and the EG selectivity remained about 90% for over 100 h. The fast desorption of scCO2 caused mechanical perturbations and crystallization of the adsorbed salt ions on the supports, decreasing particle size and increasing Cu loading (8~12 wt.%).

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Name: Nanotechnology
ISSN: 1361-6528
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