Evaluation of surfactant templates for one-pot hydrothermal synthesis of hierarchical SAPO-5

Pinpointing basic sites formed upon incorporation of iron in hierarchical SAPO-11 using catalytic model reactions

“…45,49 Indeed, the particle size of FeCTAB-11 was much smaller (9 ± 3 µm) compared to FeSAPO-11 (21 ± 10 µm) and the slight increase in P-OH group density is therefore assigned to differences in particle size. Finally, regarding the Brønsted acid sites, the introduction of mesopores via a quaternary ammonium surfactant has previously been shown to reduce the density of acid sites for SAPOs, 18 which is in accordance with the results obtained for FeCTAB-11 in this study.…”

“…In accordance to previous reports, 18 the methanol to hydrocarbons (MTH) model reaction was carried out in a tube reactor (ID: 4 mm). The reaction products were analyzed with a gas chromatograph equipped with a flame ionizing detector (FID) coupled to a mass spectrometer (GC-MS, Agilent 7890A coupled to an Agilent 5975C inert XL MSD).…”

“…The calibration, conversion, selectivity and mass balance calculations were carried out in accordance to previous reports. 18,19 3. Results & discussion…”

“…16 Previously, we have demonstrated that the methanol-to-hydrocarbons (MTH) model reaction can function as a characterization technique for locating the Brønsted acid sites and probing the pore connectivity of high acid density hierarchical SAPO-5 (12-membered ring, 0.7 nm pore apertures). 17,18 Likewise, the corresponding properties of the low acid density hierarchical SAPO-11 (10-membered ring, 0.4 nm × 0.6 nm pore apertures) 17 were successfully investigated by using the vapor phase isomerization of cyclohexanone oxime (Beckmann rearrangement, BMR) model reaction. 19 With this work, we wish to demonstrate the versatility of the previously introduced model reactions by probing the pore connectivity and location of transition metal sites in a metal-incorporated hierarchical SAPO model system.…”

Offretite Zeolite Single Crystals Synthesized by Amphiphile-Templating Approach

“…The inorganic intermediate species then enfold the CTA + hydrophilic head, thus, inducing nucleation points for long-range propagation and crystallization of offretite zeolite. Secondly, the CTA + cation also serves as a porogen by forming irregular micelles, whereby the hydrophobic tails point to each other, leading to the formation of mesopores of wide distribution [ 31 ].…”