A well-defined mesoporous amine silica surface via a selective treatment of SBA-15 with ammonia

Anissa Bendjeriou-Sedjerari (1) , Jeremie D.A. Pelletier (1) , Edy Abou-Hamad (1) , Lyndon Emsley (2) , Jean-Marie Basset (1)

1 KCC - KAUST Catalysis Center
2 ISA - Centre de RMN à très hauts champs

2D double-quantum H-1-H-1 NMR unambiguously shows that the "isolated" Si-OH surface silanols of dehydroxylated SBA-15 are converted upon treatment with ammonia into single silylamine surface site Si-NH2. The "gem" di-silanols (= Si(OH)(2)) remain intact. Treatment using HMDS produces (= Si(OSiMe3)(2)) but leaves Si-NH2 untouched. The resulting surface is hydrophobic and stable.

Mots clés: ORGANOMETALLIC CHEMISTRY; OXIDE SURFACES; DEHYDROXYLATED SILICA; NMR-SPECTROSCOPY; ACTIVE-SITES; NITRIDATION; MECHANISM; CATALYSTS; MCM-41; CHEMISORPTION

Domaines: Chimie analytique

Anissa Bendjeriou-Sedjerari, Jeremie D.A. Pelletier, Edy Abou-Hamad, Lyndon Emsley, Jean-Marie Basset. A well-defined mesoporous amine silica surface via a selective treatment of SBA-15 with ammonia. Chemical Communications, 2012, 48 (25), pp.3067-3069. ⟨10.1039/c2cc00143h⟩. ⟨hal-00699711⟩