2 research outputs found
Sustainable and Cost-Effective Protocol for Cascade Oxidative Condensation of Furfural with Aliphatic Alcohols
The oxidative condensation of furfural
with aliphatic alcohols
catalyzed by the supported Co<sub><i>x</i></sub>O<sub><i>y</i></sub>–N catalysts is developed in the presence
of molecular oxygen. For the oxidative condensation process of furfural, <i>n</i>-propanol and dioxygen, a 75.1% conversion of furfural
and 92.8% selectivity of 3-(furan-2-yl-)-2-methylacryaldehyde was
obtained when the Co<sub><i>x</i></sub>O<sub><i>y</i></sub>–N@K-10 and cesium carbonate was employed as catalytic
system. Moreover, the reaction conditions were optimized and the oxidative
condensation of furfural with different aliphatic alcohols was also
investigated. The synergistic effect between the Co<sub><i>x</i></sub>O<sub><i>y</i></sub>–N@K-10 and basic additive
was considered to be responsible for this cascade process. Furthermore,
a possible reaction mechanism is proposed for oxidative condensation
of furfural–<i>n</i>-propanol–O<sub>2</sub> (FPO) system
One-Pot Conversion of Furfural to Gamma-Valerolactone over Zr-SBA-15: Cooperation of Lewis and Brønsted Acidic Sites
A series of bifunctional Zr-SBA-15_x of varying
molar Si/Zr ratio x (15–730) with isolated
Lewis and Brønsted acid sites were prepared by an in situ synthesis
procedure and applied to the one-pot conversion of furfural (FUR)
to gamma-valerolactone (GVL). These catalysts were detailed and characterized
by XRF, XRD, N2 physisorption, FTIR, SEM, TEM, NH3-TPD, and pyridine-DRIFT techniques. On all these Zr-SBA-15_x catalysts, the conversion of FUR was higher than 99%,
while the GVL selectivity first increased and then decreased with
decreasing x. A Zr-SBA-15_25 was identified as the
best-performing catalyst, offering a 93.3% selectivity of GVL under
optimized reaction conditions. The effects of reaction temperature,
time, and solvent on catalytic performance were also investigated.
Correlating the catalyst performance with the Brønsted acid site
(BAS)/Lewis acid site (LAS) ratio uncovers that the balance between
the LAS and the BAS would be the key to the higher catalytic performance.
The possible reaction mechanism for the cascade conversion of FUR
to GVL was proposed. Moreover, basic (lutidine and pyridine) additives
were added, respectively, to the reaction solution to investigate
their effects on catalytic performance, which provide a piece of evidence
in support of the cooperative LAS–BAS bifunctional catalytic
mechanism