Study on the structure-reactivity correlation of SO42-/ZrO2-Al2O3 in n-butane isomerization reaction
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摘要: 采用“沉淀-浸渍”法制备一系列不同硫酸负载量的SO42-/ZrO2-Al2O3催化剂,利用N2吸附-脱附、Py-FTIR、XRD等手段对催化剂进行表征。在常压、200 ℃、H2:C4=2:3和质量空速为3 h-1的反应条件下,在固定床微型反应评价装置上考察了硫酸负载量对SO42-/ZrO2-Al2O3催化正丁烷异构化反应性能的影响。Py-FTIR结果表明,硫酸化处理为催化剂表面提供了丰富的Brønsted酸性位,其中,强Brønsted酸性位在正丁烷异构化反应中起重要作用,因此,硫酸化处理可显著提高正丁烷异构化活性,而Lewis酸性位与之没有直接关系。
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关键词:
- SO42-/ZrO2-Al2O3 /
- 酸性位 /
- 正丁烷 /
- 异构化
Abstract: A series of alumina-promoted sulfated zirconia catalysts were prepared by precipitation-impregnation method. The catalysts were characterized by N2 sorption, pyridine adsorption Fourier transform infrared spectroscopy (Py-FTIR), X-ray diffraction (XRD). Their catalytic performance in n-butane isomerization was evaluated in a continuous flow type fixed-bed micro-reactor at atmospheric pressure, 200℃, and H2:C4=2:3, with a weight hourly space velocity of n-butane (WHSV) of 3 h-1. The structure-reactivity relationship between surface acidity and catalytic behavior was revealed. Py-FTIR indicates that the sulfated treatment enhances the strength and density of catalytic Brønsted acid sites, which are essential for n-butane isomerization. Therefore, sulfated treatment can significantly improve the activity of n-butane isomerization, and Lewis acidity has no direct effect on it.-
Key words:
- SO42-/ZrO2-Al2O3 /
- acidity /
- n-butane /
- isomerization
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表 1 不同硫酸负载量的催化剂结构特性
Table 1 Textural properties of samples
表 2 不同硫酸负载量催化剂的表面实际硫含量
Table 2 Actual sulfur content of different samples
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