不同的沉淀剂对铁酸铜催化剂水煤气变换活性和热稳定性的影响

林性贻; 张勇; 殷玲

不同的沉淀剂对铁酸铜催化剂水煤气变换活性和热稳定性的影响

福州大学化肥催化剂国家工程研究中心, 福建福州 350002

基金项目: Supported by National Engineering Research Center of Chemical Fertilizer Catalysts, Fuzhou University.

详细信息

中图分类号: O643
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出版历程
- 收稿日期: 2014-05-21
- 修回日期: 2014-07-18
- 刊出日期: 2014-09-30

Effect of various precipitants on activity and thermal stability of CuFe₂O₄ water-gas shift catalysts

National Engineering Research Center of Chemical Fertilizer Catalysts, Fuzhou University, Fuzhou 350002, China

Funds: Supported by National Engineering Research Center of Chemical Fertilizer Catalysts, Fuzhou University.

摘要

摘要: 以氢氧化钾、碳酸钠和碳酸氢钠为沉淀剂，采用共沉淀法制备3种铁酸铜催化剂，并对其水煤气变换活性和热稳定性进行了评价。测试发现，以氢氧化钾为沉淀剂制得的催化剂表现出优异的水煤气变换活性。通过X射线粉末衍射仪（XRD）、N₂物理吸附（N₂-physisorption）、H₂-程序升温还原（H₂-TPR）、CO₂-程序升温脱附（CO₂-TPD）和循环伏安法（CV）等技术手段研究了不同的沉淀剂对催化剂的微观结构和表面性质的影响。结果发现，氢氧化钾能有效促进CuFe₂O₄的生成、抑制CuO和CuFe₂O₄晶格的长大、促使CuO在催化剂表面的较好分散、增强催化剂的还原能力、增加弱碱性位点的数量。它们显著改善了催化剂的催化活性和热稳定性。
- 水煤气变换反应 /
- 铁酸铜催化剂 /
- 还原性 /
- 弱碱性位 /
- 热稳定性
Abstract: Three kinds of CuFe₂O₄ catalysts were synthesized by co-precipitation method using potassium hydroxide (A), sodium carbonate (B) and sodium bicarbonate (C) as the precipitants. Their catalytic activity and thermal stability were evaluated in water-gas shift reaction (WGSR). The microstructure and surface property of as-prepared catalysts was investigated by X-ray diffraction (XRD), N₂-physisorption, H₂-temperature programmed reduction (H₂-TPR), CO₂-temperature programmed desorption (CO₂-TPD) and cyclic voltammetry (CV). The results show that the catalyst prepared with potassium hydroxide as precipitant exhibits excellent WGSR activity. Potassium hydroxide plays an important role in promoting the generation of CuFe₂O₄, restraining growth of crystalline CuO and CuFe₂O₄, resulting in much better dispersion of CuO on the surface of catalysts, enhancing the reducibility of catalysts, and increasing the amount of weak basic sites. These factors remarkably improve the activity and thermal stability of catalysts.
- water-gas shift reaction /
- CuFe₂O₄ catalysts /
- reducibility /
- weak basic sites /
- thermal stability

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