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Type: Artigo de evento
Title: Influence Of The Al/clay Ratio On The Pillaring Process Of Smectite [influência Da Razão Al/argila No Processo De Pilarização De Esmectita]
Author: Guerra D.L.
Lemos V.P.
Angelica R.S.
Airoldi C.
Abstract: Smectite-type clays from the state of Para, Brazil, were characterized by XRD, 27Al MAS NMR, FTIR and textural analysis by nitrogen adsorpition-desorption isotherms. In the production of pillared clays, the Al 13 ion (keggin's ion) was used. This ion was obtained by the reaction of AlC 136H 2O/NaOH solutions with OH/Al=2 molar ratio and with Al/clay ratios of 5, 10, 15, 20, 25 meq/g of clay, intercalated at 25 °C during 3 h and calcined at 450 °C (adequate temperature for calcination). The results showed that the pillarization process increased the basal spaces of the natural clay from 14.02 to 18.84 Å and the surface area from 44.30 to 198.03 m 2/g (Al/g of clay = 25 meq/g of clay, pH=4). Materials prepared with different Al/g clay ratio showed the maximum Al incorporation for Al/g of clay = 25 meqlg of clay. The thermal stability of the natural clay was improved by the pillaring procedure.
Rights: aberto
Identifier DOI: 
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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