Plasma‐Assisted Immobilization of a Phosphonium Salt and Its Use as a Catalyst in the Valorization of CO2. Issue 7 (17th March 2020)

• Record Type: Journal Article
• Authors: Hu, Yuya; Peglow, Sandra; Longwitz, Lars; Frank, Marcus; Epping, Jan Dirk; Brüser, Volker; Werner, Thomas
• Is Part Of: ChemSusChem. Volume 13:Issue 7(2020)
• Page Start: 1825
• Page End: 1833
• Publication Date: 2020-03-17
• Subjects: carbon dioxide fixation -- cyclic carbonates -- immobilization -- organocatalysis -- plasma chemistry; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201903384
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: The first plasma‐assisted immobilization of an organocatalyst, namely a bifunctional phosphonium salt in an amorphous hydrogenated carbon coating, is reported. This method makes the requirement for prefunctionalized supports redundant. The immobilized catalyst was characterized by solid‐state 13 C and 31 P NMR spectroscopy, SEM, and energy‐dispersive X‐ray spectroscopy. The immobilized catalyst (1 mol %) was employed in the synthesis of cyclic carbonates from epoxides and CO2 . Notably, the efficiency of the plasma‐treated catalyst on SiO2 was higher than those of the SiO2 support impregnated with the catalyst and even the homogeneous counterpart. After optimization of the reaction conditions, 13 terminal and four internal epoxides were converted with CO2 to the respective cyclic carbonates in yields of up to 99 %. Furthermore, the possibility to recycle the immobilized catalyst was evaluated. Even though the catalyst could be reused, the yields gradually decreased from the third run. However, this is the first example of the recycling of a plasma‐immobilized catalyst, which opens new possibilities in the recovery and reuse of catalysts. Abstract : Plasma will fix it : Plasma polymerization is used to immobilize a phosphonium salt organocatalyst (Pcat ) in an amorphous hydrogenated carbon coating on unfunctionalized metal oxide supports. The resulting catalysts are employed in the synthesis of cyclic carbonates from epoxides and CO2 in up to 99 % yield under mild conditions. Furthermore, the unprecedented recycling of a catalyst immobilized by a plasma technique is reported.