In situ and post-synthesis control of physicochemical properties of FER-type crystals

Synthesis of ferrierite by a new combination of co-structure-directing agents: 1,6-bis(N-methylpyrrolidinium)hexane and tetramethylammonium

“…S8 in the Supplementary Material). Crystals of all the samples are similar and consist of very small and thin plates, which grow in the form of agglomerates; such plate-like morphology is typically observed in ferrierite zeolites [28,29].…”

“…Besides, the absence of any signal at 0 ppm confirms that there is no extra-framework aluminum (in octahedral coordination), which indicates that all aluminum is incorporated in the tetrahedral lattice [27]. 29 Si MAS NMR spectra of the as-synthesized ferrierite samples (Fig. S7-right in the Supplementary Material) are similar and show a broad resonance band in the range from À105 to À120 ppm, with a maximum around À112 ppm, which is indicative of the existence of multiple T-sites in the structure, with two different coordination environments, Si(0Al) and Si(1Al).…”

“…Solid-State 29 Si, 27 Al and 13 C NMR spectra were performed on a Bruker AV 400 spectrometer using a BL4 probe; the rotation speed was 10 KHz in all cases. 1 H to 13 C cross-polarization spectra were recorded using p/2 rad pulses of 2.75 ms, a contact time of 3 ms and a recycle delay of 4 s. Highpower decoupled (HPDEC) 29 Si spectra were acquired using pulses of 4.5 ms to flip the magnetization p/2 rad and a recycle delay of 60 s; 27 Al spectra were measured using pulses of 0.4 ms to flip the magnetization p/30 rad and delays of 0.5 s.…”

Morphology-induced shape selectivity in zeolite catalysis

“…He has studied a number of acid-catalyzed reactions, including the conversion of methanol to hydrocarbons already in 1979 [47], and (as director of the catalysis and spectrochemistry lab in Caen) he has applied infrared spectroscopy extensively in his zeolite research. More recently, he has studied also the morphology of zeolite catalysts, with particular emphasis on nanosized [48] and hierarchical materials [49,50]. Thus, it is clear that Jean-Pierre has contributed significantly to our understanding of virtually all areas encountered in this contribution, which we are particularly pleased to dedicate to him on the occasion of his 60th birthday!…”

Direct synthesis of hierarchical ferrierite nanosheet assemblies via an organosilane template approach and determination of their catalytic activity

“…It has been reported that the conventional FER composes of the stacking of micron-sized plate-like crystals [49,59]. One reason for the change from a plate-like morphology to a microspherical shape of FER nanosheet assemblies in the presence of TPOAC relates to the fact that aluminosilicate species can react with the hydrolyzed part of organosilanes, facilitating the formation of spherical aluminosilicate precursor due to a minimization of its surface free energy [60].…”