2012-11-292012-11-292006-09GUERRA, D. L. et al. Influência da razão Al/argila no processo de pilarização de esmectita. Cerâmica, São Paulo, v. 52, n. 323, p. 200-206, jul./set. 2006. Disponível em: <http://www.scielo.br/pdf/ce/v52n323/32090.pdf>. Acesso em: 28 nov. 2012. <http://dx.doi.org/10.1590/S0366-69132006000300014>.0366-6913https://repositorio.ufpa.br/handle/2011/3250Smectite-type clays from the state of Pará, Brazil, were characterized by XRD, 27Al MAS NMR, FTIR and textural analysis by nitrogen adsorpition-desorption isotherms. In the production of pillared clays, the Al13 ion (keggin's ion) was used. This ion was obtained by the reaction of AlCl36H2O/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 ºC during 3 h and calcined at 450 ºC (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 m2/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 meq/g of clay. The thermal stability of the natural clay was improved by the pillaring procedure.porAcesso AbertoArgila pilarizadaAl13EsmectitaPará - EstadoAmazônia brasileiraArtigo de Periódico