物理化学学报 >> 2003, Vol. 19 >> Issue (10): 970-973.doi: 10.3866/PKU.WHXB20031018

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载体γ-Al2O3和钐对非晶态NiB合金热稳定性的影响

张荣斌;李凤仪;杨美华   

  1. 南昌大学应用化学研究所,南昌 330047
  • 收稿日期:2003-04-14 修回日期:2003-06-20 发布日期:2003-10-15
  • 通讯作者: 张荣斌 E-mail:rb_zhang@163.com

The Effect of Support Al2O3 and Sm on the Thermal Stability of Amorphous NiB Alloy

Zhang Rong-Bin;Li Feng-Yi;Yang Mei-Hua   

  1. Institute of Applied Chemistry, Nanchang Universiry, Nanchang 330047
  • Received:2003-04-14 Revised:2003-06-20 Published:2003-10-15
  • Contact: Zhang Rong-Bin E-mail:rb_zhang@163.com

摘要: 用化学还原法制备了NiB、NiB/Al2O3和NiBSm/Al2O3三种催化剂,它们都呈非晶结构.用等离子耦合发射光谱仪(ICP)对催化剂组分进行了分析,采用差示扫描量热法(DSC)对三种催化剂进行了热稳定性分析.结果表明,载体的引入使非晶态NiB合金的体相组成中B的含量降低.将非晶态NiB合金负载到γ-Al2O3上,可以明显改善非晶态合金的热稳定性,少量Sm可以进一步提高晶化温度.晶化激活能数据亦表明了载体和Sm对非晶结构具有良好的稳定作用.载体和Sm可能通过不同的作用提高了非晶态合金的热稳定性.

关键词: 非晶态NiB合金, 热稳定性, 晶化激活能

Abstract: Amorphous NiB, NiB/Al2O3 and NiBSm/Al2O3 catalysts were prepared by chemical reduction method. The bulk compositions of catalysts were analyzed by inductively coupled plasma (ICP). Thermal stability of the catalyst was investigated by differential scanning calorimetry (DSC). The results showed that the content of boron in bulk composition of amorphous NiB alloy decreased with the introduction of support Al2O3. The thermal stability of amorphous NiB alloy was improved obviously after supported on γ-alumina and further enhanced by adding small amount of Sm. The data of activation energy for crystallization also showed the positive effects of support and Sm on thermal stability of amorphous NiB alloy. Support and Sm may change the thermal stability by different mechanisms.

Key words: Amorphous NiB alloy, Thermal stability, Activation energy for crystallization