In Situ Generation and Immobilization of an Activated Rh Complex Catalyst in a Metal–Organic Framework for Hydrogenation at Low H2 Pressure

• Published in: European journal of inorganic chemistry 2017-12, Vol.2017 (45), p.5344-5349
• Main Authors: Takashima, Yohei, Fukuhara, Yoshimasa, Sato, Yasushi, Tsuruoka, Takaaki, Akamatsu, Kensuke
• Format: Article
• Language: English
• Subjects: Alkenes; Catalysis; Catalysts; Catalytic activity; Chemical synthesis; Coordination compounds; Explosions; Flammability; Flammable gases; Heterogeneous catalysis; Hydrogenation; Immobilization; Inorganic chemistry; Metal-organic frameworks; Particulate composites; Rhodium; Substrates
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201700993

Hydrogenation reactions under low‐pressure H2 atmosphere are highly relevant from the safety viewpoint, because H2 gas is highly flammable in air and explosions can be triggered by spark, heat, or sunlight. In this work, an Rh complex/MOF hybrid was synthesized and used as catalyst for the hydrogenation of alkene substrates. Thanks to the activation of the Rh complex catalyst during the immobilization process and the intrinsic gas‐condensation property of MOFs, the resulting composite showed much higher catalytic activity than the complex catalyst itself. Moreover, the composite can maintain its catalytic activity even at low H2 pressures that cannot support the reaction with the complex catalyst alone. Furthermore, in contrast to the complex catalyst, the composite maintained its catalytic activity even without solvent, and thus provides an environmentally friendly approach to catalysis. An Rh complex/MOF hybrid was synthesized and used as catalyst for hydrogenation reactions. The composite maintains its catalytic activity even at low H2 pressures that cannot support the reaction with the complex catalyst alone. Thus, activation of the complex catalyst during immobilization and the intrinsic gas‐condensation property of the MOF can accelerate the reaction.