A study was conducted on the speciation and reducibility of Ni in catalysts derived from hydrotalcite-type (HT) precursors intercalated by silicates. Silicate and nickel contents in Ni/Mg/Al HT precursors varied and the products obtained by thermal decomposition in the 773–1373 K range were characterized. Sample properties were related to the amount of silicates and nickel. The former altered the formation of the spinel-type phase and decreased the ratio between MgO and MgAl2O4 phases in which the active species were stabilized. On the other hand, the Ni distribution depended on the Ni-loading. Nicontaining species in the spinel phase were more abundant for high Ni-loaded catalysts, and were readily reduced by H2 treatment at 1023 K, whereas those in the Ni1xMgxO solid solution remained partially unreduced.
Pettiti, I., Gazzoli, D., Benito, P., Fornasari, G., Vaccari, A. (2015). The reducibility of highly stable Ni-containing species in catalysts derived from hydrotalcite-type precursors. RSC ADVANCES, 5, 82282-82291 [10.1039/c5ra13863a].
The reducibility of highly stable Ni-containing species in catalysts derived from hydrotalcite-type precursors
BENITO MARTIN, PATRICIA;FORNASARI, GIUSEPPE;VACCARI, ANGELO
2015
Abstract
A study was conducted on the speciation and reducibility of Ni in catalysts derived from hydrotalcite-type (HT) precursors intercalated by silicates. Silicate and nickel contents in Ni/Mg/Al HT precursors varied and the products obtained by thermal decomposition in the 773–1373 K range were characterized. Sample properties were related to the amount of silicates and nickel. The former altered the formation of the spinel-type phase and decreased the ratio between MgO and MgAl2O4 phases in which the active species were stabilized. On the other hand, the Ni distribution depended on the Ni-loading. Nicontaining species in the spinel phase were more abundant for high Ni-loaded catalysts, and were readily reduced by H2 treatment at 1023 K, whereas those in the Ni1xMgxO solid solution remained partially unreduced.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
