caa a22 4500 477091830 CHVBK 20180405111517.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF01135361 doi (NATIONALLICENCE)springer-10.1007/BF01135361 Theoretical evaluation of pillared clay adsorbents: Part I. The microporosity of Al- and Ti-pillared montmorillonite [Elektronische Daten] [N. Maes, I. Heylen, P. Cool, M. de Bock, C. Vanhoof, E. Vansant] Fillared clays have become a well known class of porous materials. Due to the versatile porosity they seem to be complementary to zeolites and can be very useful for adsorption and catalytic processes. Despite intensive research, real industrial applications are still lacking. Somehow, the porosity of these pillared clays is not what was expected. The present study reports theoretical calculations, based on simple geometrical models in combination with experimental data, in order to obtain a better insight in the PILC structure and its limiting factors. Parameters such as interpillar free distance and maximum micropore volume were calculated and compared to experimental or literature data. The final goal is to find out the potential of pillared clays as adsorbents to be used as substituents or complements for zeolites. This part reports calculations, in terms of microporosity, performed for two types of pillared clays having completely different porosity properties: Al- and Ti-PILC. Kluwer Academic Publishers, 1996 theoretical calculations nationallicence microporosity nationallicence pillared clays nationallicence adsorbents nationallicence Al-pilM : aluminium pillared montmorillonite nationallicence c : number of collapsed interlayer volumes in a stack nationallicence CEC : cation exchange capacity (meq/g) nationallicence d pp : interpillar free distance (Å) nationallicence IFS : interlayer free spacing (Å) nationallicence L : length of a clay layer (Å) nationallicence MW : molecular weight (g/mol) nationallicence N av : Avogadro constant (molecules/mol) nationallicence P : pillar height (Å) nationallicence pil/g : number of pillars in 1 g clay nationallicence (pil/g)in : number of pillars, in 1 g clay, intercalated between the layers nationallicence (pil/g)out : number of pillars, in 1 g clay, not intercalated nationallicence pl/g : number of clay layers in 1 g clay nationallicence quasi cryst/g : number of stacks or quasi crystals in 1 g clay nationallicence s : number of layers in a stack or quasi crystal nationallicence SAav : layer surface area available for pillaring (m2/g) nationallicence SABET : BET surface area (m2/g) nationallicence SAmax : maximum surface area of the clay layers (m2/g) nationallicence SAunav : layer surface area not contributing to the micropore volume (m2/g) nationallicence SA/pillar : available surface area for a pillar on a clay layer (Å2) nationallicence SA1pl : surface area of a single clay layer (Å2) nationallicence Ti-pi1M : titanium pillared montmorillonite nationallicence V micro : calculated micropore volume (cc/g) nationallicence V microexp : experimental micropore volume (cc/g) nationallicence V microideal : calculated micropore volume for an idealised situation (cc/g) nationallicence V pil : total volume of the pillars (cc/g) nationallicence V pil (inside) : total volume of the pillars between the layers (cc/g) nationallicence V tot : total pore volume atp/p 0 = 0.98 (cc/g) nationallicence W : width of a clay layer (Å) nationallicence W pil : width of a pillar (Å) nationallicence Wt%pil : weight percentage Al2O3 or TiO2 present as pillars nationallicence Maes N. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut Heylen I. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut Cool P. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut de Bock M. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut Vanhoof C. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut Vansant E. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut Journal of Porous Materials Kluwer Academic Publishers 3/1(1996-03-01), 47-59 1380-2224 3:1<47 1996 3 10934 https://doi.org/10.1007/BF01135361 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01135361 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Maes N. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Heylen I. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Cool P. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- de Bock M. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Vanhoof C. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Vansant E. Department of Chemistry Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 773 0- Journal of Porous Materials Kluwer Academic Publishers 3/1(1996-03-01), 47-59 1380-2224 3:1<47 1996 3 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer