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title of the reference :
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Preliminary results on the properties of pillared clays by mixed Al-Cu solutions.
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Publication Date:
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1997
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Author :
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Frini N., Crespin M., Trabelsi Hamda, Messad D., Van Damme, Bergaya F.
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Catalogue type :
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Livre
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Catalogue reference :
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(NLD) Appl. Clay Sci. Preliminary results on the properties of pillared clays by mixed Al-Cu solutions. Three crude bentonites samples from USA (W), Tunisia (H)and Algeria (MR)have been used in order to prepare Cu-exchanged and new mixed Al-Cu pillared clays by three methods 1/ a classical 'dilute suspension and solution' method by adding the nitrate pillaring solution to a 2percent clay suspension, 2/ a 'powder in solution' method where the clay powder is dispersed in the pillaring solution and 3/ a 'concentrated slurry' method in which a dialysis bag containing clay-water slurry (33percent w/w)is placed in the pillaring solution. These three methods are called D, P and CS respectively. Pillaring reactions was performed at 40°C with a OH/ (Al+Cu)molar ratio (R)equal to 2 and at Cu/(Al+Cu)ratio of 0, 5 and 10 percent, respectively. Chemical analysis, X-ray diffraction, N::(2)BET surface area and cation exchange capacity measurements were carried out to characterize the pillared materials. The results show that after calcination at 300°C, the three pillaring methods lead to a d::(001)peak at about 1.8 nm which subsists after one year ageing, and which remains at 1.6 nm even at 800°C for some samples. Catalytic tests in oxidation reaction of phenol by H::(2)O::(2)in diluted aqueous solution performed at room temperature show an interesting activity of the Cu-clays.
Etude expérimentale ; Solution ; Aluminium ; Cuivre ; Bentonite ; Echange ion ; Nitrate ; Suspension ; Dispersion ; Analyse éléments majeurs ; Diffraction RX ; Capacité échange cation ; Catalyse ; Oxydation ; Phénol ; Peroxyde hydrogène ; Solution aqueuse ; Propriété physicochimique ; Carbone organique ; Argile à piliers ; Dialyse ; Calcination ; Roche clastique ; Roche sédimentaire ; Tunisie ; Algérie ; Etats Unis Van Damme Bergaya F. Crespin M. Trabelsi Hamda Messad D. Frini N. Minéralogie
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Indexation decimale :
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Minéralogie
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Keywords :
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Etude expérimentale ; Solution ; Aluminium ; Cuivre ; Bentonite ; Echange ion ; Nitrate ; Suspension ; Dispersion ; Analyse éléments majeurs ; Diffraction RX ; Capacité échange cation ; Catalyse ; Oxydation ; Phénol ; Peroxyde hydrogène ; Solution aqueuse ; Propriété physicochimique ; Carbone organique ; Argile à piliers ; Dialyse ; Calcination ; Roche clastique ; Roche sédimentaire ; Tunisie ; Algérie ; Etats Unis
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Summary :
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Three crude bentonites samples from USA (W), Tunisia (H)and Algeria (MR)have been used in order to prepare Cu-exchanged and new mixed Al-Cu pillared clays by three methods 1/ a classical 'dilute suspension and solution' method by adding the nitrate pillaring solution to a 2percent clay suspension, 2/ a 'powder in solution' method where the clay powder is dispersed in the pillaring solution and 3/ a 'concentrated slurry' method in which a dialysis bag containing clay-water slurry (33percent w/w)is placed in the pillaring solution. These three methods are called D, P and CS respectively. Pillaring reactions was performed at 40°C with a OH/ (Al+Cu)molar ratio (R)equal to 2 and at Cu/(Al+Cu)ratio of 0, 5 and 10 percent, respectively. Chemical analysis, X-ray diffraction, N::(2)BET surface area and cation exchange capacity measurements were carried out to characterize the pillared materials. The results show that after calcination at 300°C, the three pillaring methods lead to a d::(001)peak at about 1.8 nm which subsists after one year ageing, and which remains at 1.6 nm even at 800°C for some samples. Catalytic tests in oxidation reaction of phenol by H::(2)O::(2)in diluted aqueous solution performed at room temperature show an interesting activity of the Cu-clays.
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