Iguchi Masayuki, Onishi Naoya, Himeda Yuichiro, Kawanami Hajime
Research Institute for Chemical Process Technology Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology, Sendai, Miyagi, 983-8551, Japan.
Research Institute of Energy Frontier Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8565.
Chemphyschem. 2019 May 16;20(10):1296-1300. doi: 10.1002/cphc.201900137. Epub 2019 Mar 28.
Aiming to develop a highly effective and durable catalyst for high-pressure H production from dehydrogenation of formic acid (DFA), the ligand effect on the catalytic activity and stability of CpIr (Cp:pentamethylcyclopentadienyl anion) complexes were investigated using 5 different kinds of N,N'-bidentate ligands (bipyridine, biimidazoline, pyridyl-imidazoline, pyridyl-pyrazole and picolinamide). The Ir complex with biimidazoline ligand exhibited the highest catalytic activity, but deactivation occurred readily at high pressure. The pyridine moiety in the ligand can enhance the stability of Ir complex catalysts for the high-pressure reaction. The Ir complex catalyst containing pyridyl-imidazoline ligand showed the high activity and best stability under the high-pressure conditions.
为了开发一种用于甲酸脱氢高压制氢（DFA）的高效且耐用的催化剂，使用5种不同的N，N'-双齿配体（联吡啶、双咪唑啉、吡啶基咪唑啉、吡啶基吡唑和吡啶甲酰胺）研究了配体对CpIr（Cp：五甲基环戊二烯基阴离子）配合物催化活性和稳定性的影响。含有双咪唑啉配体的Ir配合物表现出最高的催化活性，但在高压下很容易失活。配体中的吡啶部分可以提高Ir配合物催化剂在高压反应中的稳定性。含有吡啶基咪唑啉配体的Ir配合物催化剂在高压条件下表现出高活性和最佳稳定性。
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