Cation-directed syntheses of novel zeolite-like metalloaluminophosphates STA-6 and STA-7 in the presence of azamacrocycle templates

Adsorption of carbon dioxide in SAPO STA-7 and AlPO-18: Grand Canonical Monte Carlo simulations and microcalorimetry measurements

“…The structure of the recently synthesized SAPO STA-7 material (Wright et al 2000) exhibits an arrangement of two distinct pore channels, both situated along the [001] direction, each constrained by eightmembered rings ( Fig. 1a) with diameters of 6.93 Å and 6.21 Å for the large (A) and small (B) channels respectively.…”

“…1 Structure of STA-7 (a) showing the large (A) and small (B) eight-membered rings channels, and AlPO-18 (b) with its uniform system of eight-membered rings etry optimized using energy minimization technique implemented in GULP (Gale 1997). For SAPO STA-7 material, the pure AlPO form was selected from previous X-ray diffraction data (Wright et al 2000). To reproduce the experimental silicon fraction of 0.19, we introduced 9 silicon atoms per unit cell, following our previous methodology (Déroche et al 2008).…”

“…Full details of the experimental conditions can be found elsewhere (Wright et al 2000). The AlPO-18, prepared in its purely aluminophosphate form was kindly provided for our microcalorimetry experiment by the Department of Chemistry and Catalysis of the Utrecht University.…”

“…In some typical cases, the selectivity of a SAPO membrane can be three times higher than those usually observed in the aluminosilicates (Li et al 2004). Here, we focus on the CO 2 adsorption properties of the SAPO STA-7 material recently synthesized by the St. Andrews group (Wright et al 2000), by combining molecular simulations and microcalorimetry measurements. The first step of this work consists of building a realistic structural model of the STA-7 framework characterized by an atomic silicon fraction close to those of the experimental sample.…”

Synthesis of microporous materials using macrocycles as structure directing agents

“…One way of doing this is by substituting some of the Al 3+ ions in the structure with a divalent metal ion. In this way the metal aluminophosphate materials SAS (STA-6) 28, 29 and SAV (STA-7) 29 have been produced using methylated derivatives of cyclam (1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) and Mg 2+ , Co 2+ and other divalent metal cations to ensure charge balance. While this approach offers the possibility of producing functional framework materials, the preparation of the methylated macrocycle templates requires an extra synthetic step (on top of what can be some quite challenging synthesis in the first place).…”