CoO_x@Co Nanoparticle‐based Catalyst for Efficient Selective Transfer Hydrogenation of α,β‐Unsaturated Aldehydes

Abstract

Currently, developing simple and effective catalysts for selective hydrogenation of α,β‐unsaturated aldehydes to unsaturated alcohols is challenging. Herein, an efficient CoOx‐shell/Co‐core structured nanoparticle catalyst is synthesized by a facile ultrasonic‐assisted carbothermal reduction method. The resultant catalyst exhibits outstanding catalytic performance toward the selective transfer hydrogenation of a wide spectrum of α,β‐unsaturated aldehydes into corresponding unsaturated alcohols with over 90 % selectivity. This is the simplest nonprecious metal catalyst to be reported for the selective hydrogenation of unsaturated aldehydes.

Fe‐Co Alloyed Nanoparticles Catalyzing Efficient Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol in Water

“…Interestingly, beyond 80 8C, the COL selectivity decreased rapidly to 24.6 %, accompanying by the rapidly increased HCOL selectivity from 5.5 to 73.0 %. These indicate that the rapidly decreased COL selectivity at higher temperatures is due to the occurrence of hydrogenation on both C = O and C = C. [31] The effect of reaction time was then evaluated under 2 MPa H 2 pressure and 80 8C. As revealed in Figure 2 b, an increase in the reaction time from 0.5 to 2 h leads to a rapid increase in CAL conversion from 44.5 to 95.1 % and further increase in the reaction time results in a neglectable increase in CAL conversion.…”

“…Interestingly, beyond 80 °C, the COL selectivity decreased rapidly to 24.6 %, accompanying by the rapidly increased HCOL selectivity from 5.5 to 73.0 %. These indicate that the rapidly decreased COL selectivity at higher temperatures is due to the occurrence of hydrogenation on both C=O and C=C [31] . The effect of reaction time was then evaluated under 2 MPa H 2 pressure and 80 °C.…”

Double solvent synthesis of ultrafine Pt nanoparticles supported on halloysite nanotubes for chemoselective cinnamaldehyde hydrogenation

“…However, at temperatures beyond 80 °C, the CMA conversion and the CMO selectivity decreased and the HCMO selectivity increased significantly, which resulted from the excessive hydrogenation at high temperature. 37 As revealed in Fig. 3c and Table S2, † the CMA conversion and CMO selectivity rate increased first and then decreased with the prolongation of the reaction time from 0.5 to 2.5 h. When the reaction time was 2 h, the CMA conversion and CMO selectivity rate reached as high as 94.1% and 95.1%, respectively.…”

Fe2O3 supported Pt single atom catalysts for the selective hydrogenation of cinnamaldehyde

“…This indicated that the higher the polarity of the solvent, the higher the conversion of CAL, which was in good agreement with recent studies. 31,42 Additionally, the stability of a heterogeneous catalyst was an important factor for its practical application. Hence, a recycling test (total 4 cycles) was carried out, and Pt 1 /Fe 2 O 3 showed excellent stability in conversion (86.9%) and selectivity to COL (80.5%, Fig.…”