Synergistic effect of amino-functionalized SBA-15 in Cu-catalyzed oxidative homocoupling of phenylacetylene
Journal
Applied Catalysis A: General
Journal Volume
635
Date Issued
2022
Author(s)
Abstract
SBA-15 mesoporous silica materials with short mesochannels functionalized with various amino-groups, including NH2-, MeNH-, diamine-, triamine- and guanidine-groups were prepared through one-pot co-condensation of tetraethylorthosilicate (TEOS) and amino-containing trimethoxysilanes in the presence of P123 as pore-directing agent and an appropriate amount of Zr(IV) ions. The resultant materials immobilized with CuCl were examined as reusable catalysts in the oxidative homocoupling of phenylacetylene at room temperature with air as the oxidant. Efforts were made to avoid the liquid base additives. The Cu-guanidine-SBA-15 catalyst with Cu/guanidine molar ratio of 0.6 was found to satisfy this objective and gave the highest yield (up to ca. 97%) and nearly 100% selectivity of 1,4-diphenyl-1,3-butadiyne in 24 h. Moreover, the catalyst could retain around 90% yield after reuses for three times. © 2022 Elsevier B.V.
Subjects
Alkynes; Cu-catalyst; Homocoupling; SBA-15; Synergistic
Other Subjects
Additives; Amines; Aromatic hydrocarbons; Chlorine compounds; Copper compounds; Mesoporous materials; Molar ratio; Silica; Zirconium compounds; Alkyne; Cu catalyst; Cu catalysts; Cu-catalysts; Homocoupling; Oxidative homocoupling; Phenylacetylenes; SBA-15; Synergistic; Synergistic effect; Catalyst selectivity
Type
journal article