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

Abstract

Summary of main observation and conclusion Selective hydrogenation of α,β‐unsaturated carbonyls into saturated carbonyls is important to obtain remunerative products. However, it is still a challenge to achieve high activity and selectivity under mild conditions. Herein, Pd, Ir and bimetallic Pd‐Ir nanoparticles were uniformly deposited with high dispersity on the surface of SiC by a facile impregnation method, respectively. The as‐prepared Pd/SiC catalysts efficiently hydrogenate cinnamaldehyde to hydrocinnamaldehyde at room temperature and atmospheric pressure, and the activity of Pd/SiC is observed further enhanced by adding Ir component (conversion of 100%). In addition, the dependence of Pd‐Ir catalyst activity on Pd/Ir molar ratio confirms a synergistic effect between Ir and Pd, which originates from the electron transfer between Pd and Ir.

Toward understanding the reaction between silicon carbide and iridium in a broad temperature range

“…The XRD data of the products obtained by the reaction between ground iridium and fine α-SiC powder ((A) 1:1 and (B) 3:1) in the 1500°C-1900°C temperature range A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

“…Therefore, the Ir/SiC system has been successfully used as a component of hermetic seals for ceramic structural C f /C and SiC composites and a component of materials for extreme environmental applications. 15,16 Of equal importance is the use of the Ir/SiC system in microelectronics, sensors, [17][18][19][20] catalysis, 21 and medicine. 22 A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers.…”

“…22 A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

“…The XRD data of the products obtained by the reaction between iridium and fine α-SiC powder in the 1500°C-1900°C temperature range for different Ir: SiC ratios: (A) −1: 1; and (B) −3: 1 A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Embedding Pd‐Cu Alloy Nanoparticles in Shell of Surface‐Porous N‐Doped Carbon Nanosphere for Selective Hydrogenation of p‐Chloronitrobenzene

“…Palladium based catalysts are commonly recognized as efficient catalysts for hydrogenation reaction, but the selectivity of the target product on the unmodified Pd surface is not ideal. [ 1‐2 ] Modifying metal crystals with additives, [ 3‐4 ] modulating palladium nanoparticles with light element atoms, [ 1,5‐7 ] generating alloy nanocatalysts with other metals, [ 8‐11 ] decorating support materials [ 12‐14 ] and other methods can effectively adjust the characteristics of palladium based catalysts and improve the catalytic selectivity. Among those, alloy catalyst has advantage of avoiding the use of toxic elements ( e.g ., Pb), and the combination with non‐noble metal reduces the preparation cost of active catalyst.…”