Catalysis of Positively Charged Ru Species Stabilized by Hydroxyapatite in Amine Formylation

Abstract

Formamide is an important solvent and synthetic intermediate. Herein, we designed a hydroxyapatite (HAP)‐stabilized, positively charged Ru‐based catalysts which can efficiently catalyze the formylation reaction of amines with CO for the synthesis of formamide. The Ru‐HAP showed excellent catalytic performance in N,N‐Dimethylformamide (DMF) synthesis, with about 75 % dimethylamine conversion and >99 % DMF selectivity at 300 h of continuous reaction. The combination of characterization results and control experiments showed that positively charged Ru species, including hydrated RuOx and Ru3+ species, were catalytically active. In particular, the surface RuOx species were more active than the Ru3+ species located within the HAP framework.

Highly dispersed Co anchored on Ce-doped hydroxyapatite as a dual-functional catalyst for selective hydrogenolysis of 5-hydroxymethylfurfural

“…The XRD pattern of HAP was coincided with the typical diffraction peaks ascribed to hydroxyapatite structure (PDF#09-0432). 15,[29][30][31] For Co/HAP(Ce) and HAP(Ce), the diffraction peaks became broader compared with those of Co/HAP and HAP, which indicated that the crystal structures Co/HAP(Ce) and HAP(Ce) were not so regular, an amorphous state existed in some degree. Since CeO 2 (111) and HAP (210) have nearly identical diffraction angles, the diffraction peaks of Co/HAP(Ce) and HAP(Ce) samples at 28.5°m ay be attributed to the presence of CeO 2 (111) (CeO 2 PDF#43-1002) or HAP (210).…”