Issue 27, 2014

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

Abstract

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+1N(CH3)3Cl/TPAOH systems and in CnH2n+1N(CH3)3OH (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+1N(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) Å. 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)3Cl. The pillaring of IPC-1P samples swollen with CnH2n+1N(CH3)3OH 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 m2 g−1, Vtotal = 0.599 cm3 g−1) was found to be 1 : 1.5.

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

Article information

Article type
Paper
Submitted
16 jan 2014
Accepted
12 mar 2014
First published
12 mar 2014

Dalton Trans., 2014,43, 10548-10557

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

M. Shamzhy, M. Mazur, M. Opanasenko, W. J. Roth and J. Čejka, Dalton Trans., 2014, 43, 10548 DOI: 10.1039/C4DT00165F

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