A ligand design strategy to enhance catalyst stability for efficient formic acid dehydrogenation
Jian Guo1, Maoliang Li2, Chengkai Yin2
1School of Metallurgy and Environment, Central South University, No. 932, Lushan Road, Changsha City, Hunan Province, 410083 China. qitiangui@csu.edu.cn.
Abstract:
New Ir complexes bearing N-(methylsulfonyl)-2-pyridinecarboxamide (C1) and N-(phenylsulfonyl)-2-pyridinecarboxamide (C2) were employed as catalysts for aqueous formic acid dehydrogenation (FADH). The ligands were designed to maintain the picolinamide skeleton and introduce strong sigma sulfonamide moieties. C1 and C2 exhibited good stability towards air and concentrated formic acid (FA). During 20 continuous cycles, C1 and C2 could achieve the complete conversion of FA with TONs of 172 916 and 172 187, respectively. C1 achieved a high TOF of 19 500 h-1 at 90 °C and an air-stable Ir-H species was observed by 1H NMR spectroscopy.
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