摘要
使用不同铁含量的Ｎｉ－Ｆｅ－Ａｌ合金前体制取雷尼镍催化剂。Ｘ－射线衍射表明，铁的加入改变了Ｎｉ－Ａｌ合金的体相结构，穆斯堡尔谱测定表明铁在前体中以零价存在，在雷尼镍催化剂中以Ｆｅ（Ⅲ）存在，经５７３ＫＨ２还原生成Ｆｅ－Ｎｉ合金。微分吸附量热表明，Ｆｅ－Ｎｉ合金的形成抑制了雷尼镍催化剂对Ｈ２和ＣＯ的吸附。
Raney nickel catalysts with different iron content were prepared from the Ni Fe Al precursors. X ray diffraction showed that the addition of iron influenced the bulk structure of the raw alloy. Mossbauer spectroscopy indicated that iron existed as metal in the as prepared samples. However, the iron was oxidized to Fe(Ⅲ) during the leaching by sodium hydroxide solution to form corresponding Raney catalysts. Upon treatment in H 2 at 573K, the iron could be reduced to Fe(0), forming Fe Ni alloy on the surface of the catalysts, which greatly decreased the adsorption of H 2 and CO, as evidenced by the adsorptive microcalorimetry.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1997年第3期320-324,共5页
Chinese Journal of Inorganic Chemistry
基金
国家教委"跨世纪优秀人才基金"
国家自然科学基金
关键词
雷尼镍
催化剂
吸附量热
镍
铁
铝
Raney nickel catalyst\ \ \ microcalorimetric adsorption\ \ \ Mossbauer spectroscopy
