Visible-Light-Driven Photocatalytic Suzuki–Miyaura Coupling Reaction on Mott–Schottky-type Pd/SiC Catalyst

Abstract

The Mott−Schottky heterojunction in Pd/SiC can continuously transfer photogenerated electrons to Pd nanoparticles and leave holes in SiC under irradiation. The electrons in Pd particles and holes in SiC played different roles in the photocatalytic Suzuki−Miyaura coupling reaction, respectively, for cleaving the C−Br or C−I bond in benzene halides and the C−B bond in phenylboronic acids. Therefore, the intrinsic activity of Pd was dramatically enhanced when employing SiC-supported Pd nanoparticles as the photocatalyst for the coupling reaction. The Mott− Schottky-type Pd/SiC catalyst in the coupling of iodobenezene and phenylboronic acid showed a high turnover frequency of 1053 h −1 and a selectivity of nearly 100% under visible-light irradiation at 30°C. This provides a green photocatalytic route for synthesizing biaryl compounds and a facile strategy for designing novel photocatalysts for a wide range of organic transformations driven by visible light.

Silicon Carbide Supported Palladium‐Iridium Bimetallic Catalysts for Efficient Selective Hydrogenation of Cinnamaldehyde

“…Recently, high specific surface area β‐SiC has been supposed as a potential support alternatives to carbon materials due to its stable chemical property, high mechanical strength and good thermal conductivity . In the previous researches, we found that the electron transfer occurred between metals and SiC caused by Mott‐Schottky effect, which can significantly tune the activity and selectivity of SiC‐supported metallic catalysts …”

Graphitic Carbon Nitride (g‐C3N4) Supported Palladium Species: An Efficient Heterogeneous Photocatalyst Surpassing Homogeneous Thermal Heating Systems for Suzuki Coupling

“…[5][6][7]15,20] The supported Pd catalysts can exist stably without any surfactants and therefore effectively circumvent the reduction of catalytic activity induced by the aggregation and steric hinderance of surfactants. [5][6][7]15,20] Most of Suzuki coupling reactions takes place at thermal heating conditions, which consumes a relatively large amount of energy. To realize green Suzuki coupling reactions, Pd are integrated with solar active materials which absorb light to provide energy for reaction.…”

“…[10][11][12][13][14][15] Pd nanoparticles have been loaded on SiC particles and achieved photocatalytic Suzuki coupling reaction. [20] Similar to other two-dimensional materials, [21,22] g-C 3 N 4 has been widely studied in photocatalytic hydrogen evolution, [23][24][25] CO 2 reduction [26] and N 2 fixation [27] owing to its suitable energy band structure, low cost, and facile synthesis. Moreover, compared with SiC, the abundant nitrogen atoms and six-fold cavities formed by nitrogen atoms can bind Pd nanoparticles or Pd atoms very strongly, [6,23,25] which effectively inhibits the aggregation of Pd nanoparticles and thereby increases the stability.…”

Heterogeneous Photocatalyzed C−C Cross‐coupling Reactions Under Visible‐light and Near‐infrared Light Irradiation

“…Another Mott‐Schottky type photocatalyst (Pd/SiC) has also been developed for photocatalyzed Suzuki C−C cross‐coupling reaction under visible light irradiation at room temperature. Guo et al . have demonstrated that the Mott‐Schottky type Pd/SiC photocatalyst showed a high activity (TOF of 1053 h −1 and selectivity of 100 %) with good stability and recyclability under visible light irradiation for 80 min at 30 °C in the coupling of iodobenzene and phenylboronic acid.…”