载气气氛对SO42-/ZrO2-Al2O3催化正丁烷异构化反应性能的影响研究

石油炼制与化工 ›› 2018, Vol. 49 ›› Issue (7): 14-18.

载气气氛对SO42-/ZrO2-Al2O3催化正丁烷异构化反应性能的影响研究

张文芳,张敏秀,王鹏照,杨朝合,李春义

中国石油大学（华东）重质油国家重点实验室

收稿日期:2017-12-13 修回日期:2018-02-12 出版日期:2018-07-12 发布日期:2018-07-26
通讯作者: 李春义 E-mail:chyli_upc@126.com
基金资助:
国家自然科学基金青年科学基金

EFFECT OF CARRIER GAS ON n-BUTANE ISOMERIZATION OVER SO42-/ZRO2-AL2O3

Received:2017-12-13 Revised:2018-02-12 Online:2018-07-12 Published:2018-07-26
Supported by:

摘要/Abstract

摘要： 采用“沉淀-浸渍”法制备SO42-/ZrO2-Al2O3催化剂，在常压、200 ℃的反应条件下，通过改变载气类型和数量，在固定床微型反应评价装置上考察了载气气氛对SO42-/ZrO2-Al2O3催化正丁烷异构化反应性能的影响。实验结果表明，惰性的氮气仅仅起到稀释原料和中间产物浓度的作用；而氢气在该反应中是非惰性的，除稀释作用外，还与催化剂发生相互作用，既能与正丁烷分子在活性中心上发生竞争吸附，还能提高中间物种和产物分子从催化剂表面上脱附下来的能力，从而减缓催化剂的失活速率。其中，与催化剂的相互作用是其提高催化剂稳定性的关键因素。

关键词: 载气, 硫酸化氧化锆, 正丁烷异构化, 失活

Abstract: The alumina-promoted sulfated zirconia catalysts were prepared by precipitation-impregnation method. The effect of carrier gas on n-butane isomerization over SO42-/ZrO2-Al2O3 was investigated in a continuous flow fixed-bed micro-reactor at atmospheric pressure and 200 ℃ using hydrogen, nitrogen, and mixture of hydrogen and nitrogen as carrier gas. The results showed that the inert nitrogen only plays the role of diluent gas, which decreases the concentration of n-butane and intermediate species. However, the hydrogen adsorbed on the catalyst surface is active in reaction. In addition to dilution, the hydrogen accelerates the desorption of intermediate species and product molecules from the catalyst surface through competitive adsorption with n-butane and improves the stability of catalyst significantly due to interaction between H2 and catalyst active size, which is the determining factor for this improvement.

Key words: carrier gas, SO42-/ZrO2-Al2O3, n-butane isomerization, deactivation

中图分类号:

张文芳张敏秀王鹏照杨朝合李春义. 载气气氛对SO42-/ZrO2-Al2O3催化正丁烷异构化反应性能的影响研究[J]. 石油炼制与化工, 2018, 49(7): 14-18.

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