INVESTIGADORES
VERA carlos Roman
artículos
Título:
Influence of hydrothermal aging on the catalytic activity of sulfated zirconia
Autor/es:
M. BUSTO; K. SHIMIZU; C.R. VERA; J.M. GRAU; C.L. PIECK; M.A. D'AMATO; M.T. CAUSA; M. TOVAR
Revista:
APPLIED CATALYSIS A-GENERAL
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2008 vol. 348 p. 173 - 182
ISSN:
0926-860X
Resumen:
The use of reflux aged zirconia gel in the synthesis of sulfated zirconia catalysts for isomerization of short
paraffins and isomerization-cracking of long paraffins was assessed. It was found that reflux aging greatly
improved zirconia textural properties. The growth of the monoclinic phase was greatly suppressed and
the initial area and sintering resistance were increased. The specific surface area of reflux aged material
with no sulfate was almost 75 m2 g1 after calcination at 800 8C. Sulfate promotion of aged materials
further increased the tetragonal/monoclinic ratio and the area of sulfated catalysts was 220 m2 g1 after
calcination at 600 8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
calcination at 600 8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
further increased the tetragonal/monoclinic ratio and the area of sulfated catalysts was 220 m2 g1 after
calcination at 600 8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
calcination at 600 8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
2 g1 after calcination at 800 8C. Sulfate promotion of aged materials
further increased the tetragonal/monoclinic ratio and the area of sulfated catalysts was 220 m2 g1 after
calcination at 600 8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
calcination at 600 8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
2 g1 after
calcination at 600 8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
8C.
Impregnation of reflux aged materials with sulfate produced materials which had very low activity in
isomerization of n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.
n-butane. The effect of aging was explained in terms of a dissolution-precipitation
process that eliminated specific sites of the gel that were responsible for much of the activity of the final
catalyst. In the case of the hydroisomerization-cracking of long paraffins the effect was less deletereous
partly due to the higher reactivity of this feedstock.