STRUCTURE OF RANEY NICKEL .1. PORE STRUCTURE
STRUCTURE OF RANEY NICKEL .1. PORE STRUCTURE
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DOI：
10.1016/0021-9517(69)90432-1
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发表时间：
1969-01-01
影响因子：
7.3
通讯作者：
ANDERSON, RB
中科院分区：
文献类型：
--
作者：
FREEL, J;PIETERS, WJM;ANDERSON, RB
用金相方法对雷尼镍合金进行了检验。用氢氧化钠水溶液以几种方式提取合金，并测定-195 °C下的氮气等温线。活化催化剂的孔结构与原始合金的相组成相对无关。在50 °C下提取的样品与在碱溶液沸点107 °C下制备的样品之间观察到孔结构的显著差异。50 °C下的制剂具有110 ± 10 m2/g的表面积和0.07 ± 0.02 cc/g的孔体积，而107 °C下的浸提具有80 ± 10 m2/g和0.12 ± 0.02 cc/g的孔体积。两种类型的样品具有双峰孔分布，其中孔径的最大值在20-24 μ m和34-48 μ m的范围内，但50 ℃的制备物比107 ℃的样品含有更大比例的小孔。用新鲜的碱水溶液进一步处理50 °C的制剂将孔结构改变为高温提取的典型孔结构。数据给出了部分提取的催化剂和制备用小于化学计量的碱量。
Raney nickel alloys were examined by metallographic methods. The alloys were extracted by aqueous sodium hydroxide in several ways and nitrogen isotherms at −195 °C determined. The pore structure of the activated catalyst was relatively independent of phase composition of the original alloy. Significant differences in pore structure were observed between samples extracted at 50 °C and those prepared at the boiling point of the alkali solution, 107 °C. Preparations at 50 °C had a surface area of 110 ± 10 m2/g and a pore volume of 0.07 ± 0.02 cc/g compared with 80 ± 10 m2/g and 0.12 ± 0.02 cc/g for extraction at 107 °C. Both types of samples had a bimodal pore distribution with maxima for pore diameters in range 20–24 Å and 34–48 Å, but 50 °C preparations contained a larger fraction of small pores than the 107 °C samples. Further treatment of the 50 °C preparation with fresh aqueous alkali changed the pore structure to that typical of high-temperature extraction. Data are given for partly extracted catalysts and preparations made with less than the stoichiometric amount of alkali.