焙烧气氛对K2CO3/γ-Al2O3吸附剂脱除异戊二烯中二硫化碳 性能的影响

doi:10.16085/j.issn.1000-6613.2020-0294

摘要/Abstract

摘要：

采用等体积浸渍法将碳酸钾负载在氧化铝载体上，经不同气氛焙烧制备了K₂CO₃/γ-Al₂O₃吸附剂，考察了不同焙烧气氛对K₂CO₃/γ-Al₂O₃吸附剂在异戊二烯中吸附脱除二硫化碳性能的影响。采用XRD、压汞、CO₂-TPD、FTIR等手段对吸附剂的晶体结构、孔道结构、碱性活性位点、表面官能团等进行了表征分析。结果表明，不同焙烧气氛能够影响K₂CO₃/γ-Al₂O₃吸附剂的脱硫能力且其与吸附剂的孔道结构、K₂CO₃活性位点的数目分布、 H—O、C $? ????$ O化学键有关。其中，在空气焙烧气氛下所得的K₂CO₃/γ-Al₂O₃吸附剂吸附脱除异戊二烯中二硫化碳的吸附性能最佳。在常温常压下，当剂油质量比为1∶10时，可以将异戊二烯原料油中硫含量由2000mg/kg降至769mg/kg，吸附剂硫容（质量分数）达到1.23%。

关键词: 氧化铝, 吸附, 吸附剂

Abstract:

K₂CO₃/γ-Al₂O₃ adsorbents were prepared by calcination in different atmospheres with potassium carbonate supported on alumina carrier by equal volume impregnation method. The effect of different calcination atmosphere on the performance of the K₂CO₃/γ-Al₂O₃ adsorbents for removing carbon disulfide from isoprene was investigated. XRD, mercury intrusion, CO₂-TPD, FTIR were used to characterize and analyze the crystal structure, pore structure, basic active sites, surface functional groups of the adsorbents. The results show that the calcination atmosphere can affect the desulfurization capacity of the K₂CO₃/γ-Al₂O₃ adsorbent, which is related to the pore structure of the adsorbent, the distribution of K₂CO₃ active sites, and the H—O and C $? ????$ O chemical bonds. Among these adsorbents, the K₂CO₃/γ-Al₂O₃ adsorbent calcinated in air has the best adsorption performance for the removal of carbon disulfide in isoprene. At normal temperature and pressure, when the mass ratio of adsorbent to oil was 1∶10, the sulfur content in the isoprene was reduced from 2000mg/kg to 769mg/kg, and the sulfur capacity of the adsorbent reached 1.23%.

Key words: alumina, adsorb, adsorbent

中图分类号:

TE65

孟令刚, 张现策, 李芹, 姜伟丽, 周红军, 龚学成, 周广林. 焙烧气氛对K₂CO₃/γ-Al₂O₃吸附剂脱除异戊二烯中二硫化碳性能的影响[J]. 化工进展, 2021, 40(1): 221-226.

Linggang MENG, Xiance ZHANG, Qin LI, Weili JIANG, Hongjun ZHOU, Xuecheng GONG, Guanglin ZHOU. Effect of calcination atmosphere on K₂CO₃/γ-Al₂O₃ adsorbent for removing carbon disulfide from isoprene[J]. Chemical Industry and Engineering Progress, 2021, 40(1): 221-226.

图/表 8

图1 不同焙烧气氛制备得到的吸附剂3h硫含量随时间变化曲线

图2 不同焙烧气氛制备得到的吸附剂3h硫容

图3 不同气氛下焙烧制备的K2CO3/γ-Al2O3吸附剂的XRD谱图

表1 不同气氛下焙烧制备的K2CO3/γ-Al2O3吸附剂孔结构参数

吸附剂焙烧方式

比表面积

/m²·g^-1

比孔容

/mL·g^-1

平均孔径

/nm

图4 不同气氛下焙烧制备的K2CO3/γ-Al2O3吸附剂孔径分布图

图5 不同焙烧气氛焙烧制备的K2CO3/γ-Al2O3吸附剂的CO2-TPD图

表2 不同气氛下焙烧制备的K2CO3/γ-Al2O3吸附剂的总碱量

吸附剂

比容吸附量（总碱量）/μL·g^-1

K₂CO₃/γ-Al₂O₃（压缩空气）

K₂CO₃/γ-Al₂O₃（氧气）

K₂CO₃/γ-Al₂O₃（氮气）

46512.44

42802.56

48298.15

图6 不同气氛下焙烧制备的K2CO3/γ-Al2O3吸附剂的红外光谱

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焙烧气氛对K₂CO₃/γ-Al₂O₃吸附剂脱除异戊二烯中二硫化碳性能的影响

Effect of calcination atmosphere on K₂CO₃/γ-Al₂O₃ adsorbent for removing carbon disulfide from isoprene

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