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.

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.
Pettiti, Ida; Gazzoli, Delia; Benito, Patricia; Fornasari, Giuseppe; Vaccari, Angelo
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/515943
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 13
social impact