Open AccessSynthesis and application of SBA-15-supported CuO as an efficient catalyst for the oxidative C(sp2)-O coupling reaction
Author(s) -
Ha V. Le,
Khanh Vinh Ho,
Thị Ngọc Tú Lê,
Vy T. Nguyen,
Khoa D. Nguyen
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/947/1/012033
Subject(s) - catalysis , calcination , copper , yield (engineering) , oxidative coupling of methane , nuclear chemistry , salicylaldehyde , coupling reaction , hexagonal crystal system , peroxide , dimethylformamide , materials science , chemistry , crystallography , polymer chemistry , organic chemistry , metallurgy , schiff base , solvent
SBA-15-supported CuO was synthesized via wet impregnation of SBA-15 with copper (II) acetylacetonate followed by calcination in the static air. The BET surface area of the Cu-containing SBA-15 was approximately 600 m 2 /g, which significantly decreased in comparison with that of as-synthesized SBA-15 silica (1081 m 2 /g). The successful loading of copper with a 3.20 wt.% content was determined by ICP-OES analysis, consistent with theoretical composition. However, no Cu-based phases were detected on the PXRD results and TEM images for CuO/SBA-15 showed regular hexagonal meso channels remained, indicating that CuO species was well distributed in the SBA-15 framework via the applied synthetic procedure. Catalytic activity of SBA-15-supported CuO was investigated for the selective C(sp 2 )-O coupling reaction between salicylaldehyde and N, N -dimethylformamide (DMF) in the presence of di-tert butyl peroxide (DTBP) as an oxidant. Influence of the reaction conditions on the formation of desired product was studied including reaction time, temperature, reactant ratio, amount of catalyst and oxidant. The experimental results proved that the high activity of the prepared catalyst as the C(sp 2 )-O coupling product could be obtained in an excellent yield of 90% with only 3 mol% of SBA-15-supported CuO in the presence of 4 equivalents of DTBP at 120 °C in 2 hours.