Swelling and pillaring of the layered precursor IPC-1P: tiny details determine everything

0446859 - ÚFCH JH 2016 RIV GB eng J - Journal Article
Shamzhy, Mariya - Mazur, Michal - Opanasenko, Maksym - Roth, W. J. - Čejka, Jiří
Swelling and pillaring of the layered precursor IPC-1P: tiny details determine everything.
Dalton Transactions. Roč. 43, č. 27 (2014), s. 10548-10557. ISSN 1477-9226. E-ISSN 1477-9234
R&D Projects: GA ČR GP13-17593P
Institutional support: RVO:61388955
Keywords : calcination * mesoporous materials * molecular sieves
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 4.197, year: 2014

The influence of swelling (i.e. the size of tetraalkylammonium surfactant molecule, the presence of tetrapropylammonium hydroxide (TPAOH), pH) and pillaring (i. e. the ratio between the swollen precursor IPC-1P and tetraethyl orthosilicate) conditions on the structure and textural properties of the resulting materials was studied in detail for IPC-1P, which is the layered precursor of zeolite PCR. The swelling of IPC-1P proceeds efficiently under basic conditions both in mixed CnH2n+N-1(CH3)(3)Cl/TPAOH systems and in CnH2n+N-1(CH3)(3)OH (n = 8, 10, 12, 14, 16, 18) solutions at pH = 13-14. The intercalation of CnH2n+1N+(CH3) 3 in IPC-1P resulted in the formation of expanded materials with interlayer distances growing with increasing length of the alkyl chain in CnH2n+N-1(CH3)(3) +: 1.59-1.86 (n = 8) < 1.89-2.11 (10) < 2.05-2.26 (12) = 2.08-2.26 (14) < 2.37-2.43 (16) < 2.57-2.71 (18) angstrom. IPC-2 zeolite was formed during calcination of IPC-1P samples swollen in CnH2n+1N(CH3) 3OH solution, while PCR zeolite can be obtained by calcination of IPC-1P treated with either CnH2n+1N(CH3) 3Cl/TPAOH or CnH2n+1N(CH3)(3)Cl. The pillaring of IPC-1P samples swollen with CnH2n+1N(CH3)(3)OH provided mesoporous materials with narrow pore size distribution in the range 2.5-3.5 nm. Pillared materials derived from the samples swollen in the presence of TPAOH were characterized by a broader pore size distribution. The optimal TEOS/IPC-1PSW ratio being sufficient for the formation of well-ordered pillared derivatives characterized by improved textural properties (SBET = 878 m(2) g(-1), Vtotal = 0.599 cm3 g-1) was found to be 1 : 1.5.
Permanent Link: http://hdl.handle.net/11104/0248813