A Yarge-pore ECNU-19 material with unique pore system consisting of 12-ring （12R） pore channels intersected by 8R channels was post-synthesized via interlayer-expansion of HUS-2 lameliar silicate with silylating age...A Yarge-pore ECNU-19 material with unique pore system consisting of 12-ring （12R） pore channels intersected by 8R channels was post-synthesized via interlayer-expansion of HUS-2 lameliar silicate with silylating agent of 1,3-dimethyltetramethoxydisiloxane （DMTMDS）. In consideration of the fact that the HUS-2 precursor possessed a special structure with a malposition of the neighboring layers as well as silicon vacancies on layer surface, a ＂detemplating disassembly - intercalation reassembly - silylation＂ strategy was proposed to realize a successful interlayer-expansion and structural amending. An acid treatment was firstly performed to remove a part of the structure-directing agent molecules, which favored the following intercalation by bulk organic species. The intercalation not only rearranged the relative position of up-down layers but also provided enough interlayer space for the insertion of dimeric silane molecules. Two -OH groups attached to one silicon atom of the silane molecule reacted with two close silanols on the up-surface layer, while the other two -OH groups condensed with two silanols on the down-surface layer, which then connected the two layers via -Si-O-Si- pillars and constructed new 22R pores along o axis and 8R pores along c axis, respectively.展开更多
文摘A Yarge-pore ECNU-19 material with unique pore system consisting of 12-ring （12R） pore channels intersected by 8R channels was post-synthesized via interlayer-expansion of HUS-2 lameliar silicate with silylating agent of 1,3-dimethyltetramethoxydisiloxane （DMTMDS）. In consideration of the fact that the HUS-2 precursor possessed a special structure with a malposition of the neighboring layers as well as silicon vacancies on layer surface, a ＂detemplating disassembly - intercalation reassembly - silylation＂ strategy was proposed to realize a successful interlayer-expansion and structural amending. An acid treatment was firstly performed to remove a part of the structure-directing agent molecules, which favored the following intercalation by bulk organic species. The intercalation not only rearranged the relative position of up-down layers but also provided enough interlayer space for the insertion of dimeric silane molecules. Two -OH groups attached to one silicon atom of the silane molecule reacted with two close silanols on the up-surface layer, while the other two -OH groups condensed with two silanols on the down-surface layer, which then connected the two layers via -Si-O-Si- pillars and constructed new 22R pores along o axis and 8R pores along c axis, respectively.
