caa a22 4500 477092039 CHVBK 20180405111517.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF01137909 doi (NATIONALLICENCE)springer-10.1007/BF01137909 Theoretical evaluation of pillared clay adsorbents: Part III: The total porosity and the macrostructure of Al-pillared montmorillonite and hectorite [Elektronische Daten] [M. De Bock, N. Maes, P. Cool, I. Heylen, E. Vansant] As a new class of porous materials, pillared clays have been more and more investigated as a potential substituent or complement to zeolite materials. Despite of intensive research, real industrial applications are still lacking. Somehow, the porosity of these materials is lower than what was expected. To evaluate the potential of the pillared clays as adsorbent, theoretical calculations were carried out to obtain a better insight of the influence of the PILC's macrostructure on the micro- and mesoporosity. Assuming the layers to stack in a 3-dimensional brick-like fashion, the micro- and mesoporosity and interpillar free distance were calculated taking into account: the clay layer dimensions, interlayer free spacing, lateral distance between adjacent layers, partial pillaring/collapse and pillar symmetry. The calculations were performed for Al-pillared montmorillonite and hectorite and validated with experimental results. Kluwer Academic Publishers, 1996 theoretical calculations nationallicence total porosity nationallicence macrostructure nationallicence pillared clays nationallicence a : height of the mesopore nationallicence Al-pilM : aluminium pillared montmorillonite nationallicence Al-pilH : aluminium pillared hectorite nationallicence b : lateral distance between two stacks nationallicence CEC : cation exchange capacity meq/g nationallicence d pp : interpillar free distance nationallicence H : height of a clay layer Å nationallicence IFS : interlayer free spacing Å nationallicence L : length and width of a clay layer Å 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 (pil/g)tot : total number of pillars in 1 g clay nationallicence pl/g : number of clay layers in 1 g clay nationallicence s : number of layers in a stack 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 SAmesoav : available surface area in the mesopores m2/g nationallicence Ustr : unit structure nationallicence Ustr/g : number of unit structures in 1 g clay nationallicence Vfree : free volume in the unit structure nationallicence Vmesoav : calculated available mesopore volume cc/g nationallicence Vmesoult : calculated ultimate mesopore volume cc/g nationallicence Vmicroav : calculated available micropore volume cc/g nationallicence Vmicroult : calculated ultimate micropore volume cc/g nationallicence V1pil : volume of one pillar cc/g nationallicence Vpil(in) : total volume of the pillars between the layers cc/g nationallicence Vpil(out) : total volume of the pillars outside the layers cc/g nationallicence Vtot : total pore volume atp/p 0 = 0.98 cc/g nationallicence Wpil : width of a pillar Å nationallicence Wt%pil : weight percentage Al2O3 present as pillars nationallicence De Bock M. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut Maes N. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut Cool P. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut Heylen I. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut Vansant E. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut Journal of Porous Materials Kluwer Academic Publishers 3/4(1996-12-01), 207-216 1380-2224 3:4<207 1996 3 10934 https://doi.org/10.1007/BF01137909 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01137909 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- De Bock M. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Maes N. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Cool P. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Heylen I. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 700 1- Vansant E. Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp (UIA), Universiteitsplein I, B-2610, Wilrijk, Belgium aut NATIONALLICENCE 773 0- Journal of Porous Materials Kluwer Academic Publishers 3/4(1996-12-01), 207-216 1380-2224 3:4<207 1996 3 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer