The reducibility of highly stable Ni-containing species in catalysts derived from hydrotalcite-type precursors

被引：19
作者：
Pettiti, Ida [1 ]
Gazzoli, Delia [1 ]
Benito, Patricia [2 ]
Fornasari, Giuseppe [2 ]
Vaccari, Angelo [2 ]
机构：
[1] Univ Roma La Sapienza, Dip Chim, I-00185 Rome, Italy
[2] Univ Bologna, Alma Mater Studiorum, Dipartimento Chim Ind Toso Montanari, I-40136 Bologna, Italy
来源：
RSC ADVANCES | 2015年 / 5卷 / 100期
关键词：
LAYERED DOUBLE HYDROXIDES; PARTIAL OXIDATION; HYDROGEN-PRODUCTION; SOLID-SOLUTIONS; CARBON-DIOXIDE; METHANE; CH4; CO2; RH; COPRECIPITATION;
D O I：
10.1039/c5ra13863a
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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. Ni-containing species in the spinel phase were more abundant for high Ni-loaded catalysts, and were readily reduced by H-2 treatment at 1023 K, whereas those in the Ni1-xMgxO solid solution remained partially unreduced.
引用
收藏
页码：82282 / 82291
页数：10
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