Assembled Organoruthenium (II) for Formaldehyde Decomposition and Hydrogen Production.

Formaldehyde decomposition is not only an attractive method for hydrogen production, but also a potential approach for gaseous formaldehyde removal. In this research, we prepare some assembled organoruthenium through coordination reaction between Ru( p -Cymene)Cl 2 and bridge-linking ligands . It is a creative approach for Ru( p -Cymene)Cl 2 conversion into heterogeneous particles. XPS shows the N-Ru bond are formed between bridge-linking ligand and Ru( p -Cymene)Cl 2 . The assembled organoruthenium have high abundant active sites for formaldehyde decomposition at low temperature. The reaction rate could increase linearly with temperature and formaldehyde concentration, with a TOF of 2420 h -1 at 90 ℃. It is promising for gaseous formaldehyde decomposition in air or oxygen-free condition. Formaldehyde conversion is up to 95% over Ru-DAPM at 90 ℃ in air. Gaseous formaldehyde decomposition is a two-steps process under oxygen-free condition. Firstly, formaldehyde dissolve in water, and be converted into hydrogen and formic acid through formaldehyde-water shift reaction. Then intermediate formic acid will further decompose into hydrogen and carbon dioxide. We also find formaldehyde decomposition is a synergetic catalysis process of oxygen and water in moist air. Oxygen is conducive to desorption and decomposition of formic acid on the active sites, so assembled organoruthenium exhibit slightly higher conversion for formaldehyde decomposition in moist air.