Cr<sup>3+</sup>改性NaY分子筛的吸附脱氮性能

洪新; 唐克

Cr³⁺改性NaY分子筛的吸附脱氮性能

洪新,
唐克^,

基金项目:

辽宁省自然科学基金 2014020113

详细信息

中图分类号: TE624.9
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出版历程
- 收稿日期: 2015-07-28
- 修回日期: 2015-10-10

Adsorptive denitrification of NaY molecular sieve modified by Cr³⁺

HONG Xin,
TANG Ke^,

More Information

Corresponding author: Tel: 86-416-4198019, E-mail: tangke0001@163.com

摘要

摘要: 对Cr³⁺离子改性NaY分子筛的实验条件进行了研究, 通过XRD、FT-IR、N₂吸附-脱附等方法对改性后的CrY分子筛进行表征, 确定最佳改性条件为温度40℃, Cr³⁺浓度0.5 mol/L, 改性两次。FT-IR谱图表明, CrY分子筛波数1 147 cm^-1处峰明显消失, 且波数1 024 cm^-1峰与标准的NaY分子筛相比发生了蓝移现象, 可以判定Cr³⁺交换到分子筛骨架上。考察了吸附时间和温度对CrY分子筛吸附脱除模拟燃料中喹啉的影响。结果表明, 吸附温度对吸附影响不大, 可在室温下进行。CrY对喹啉的吸附主要为化学吸附, 且吸附类型为配位吸附和π络合吸附, 最佳吸附时间为30 min, 吸附等温线线性回归表明, CrY分子筛对喹啉吸附动力学模型为L型和F型混合吸附。
- NaY分子筛 /
- 改性 /
- 吸附脱氮 /
- Cr³⁺离子
Abstract: The modification of NaY by chromium ion was systemically studied.The modified CrY molecular sieve was characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR) and nitrogen adsorption.The experimental results show that the optimum condition of modification are two times modification with 0.5 mol/L Cr³⁺at 40℃.The result of FT-IR suggested the peak disappeared at 1 147 cm^-1 and the peak generated a blue shift at 1 024 cm^-1, indicating that Cr³⁺ had exchanged Na⁺ in the framework of NaY molecular sieve.Static adsorption denitrification of a model fuel on CrY molecular sieve had carried out at different adsorption time and temperature.The results showed that the adsorption of quinoline on CrY molecular sieve was chemical adsorption and the adsorption type was coordination adsorption and π complex adsorption.The adsorption effect was better at room temperature for 30 min.The adsorption of quinoline over CrY molecular sieve belongs to Langmuir adsorption and Freundlich adsorption model.
- NaY molecular sieve /
- modification /
- adsorptive denitrification /
- chromium ion

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图 1 不同温度下Cr³⁺改性的NaY分子筛的XRD谱图

Figure 1. XRD spectra of NaY modified by Cr³⁺ at different temperature

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图 2 不同Cr³⁺改性次数的NaY分子筛XRD谱图

Figure 2. XRD spectra of NaY modified by Cr³⁺ with different times

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图 3 不同Cr³⁺浓度改性NaY分子筛的XRD谱图

Figure 3. XRD spectra of NaY modified by different Cr³⁺concentrations

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图 4 CrY分子筛的吸附-脱附曲线及H-K孔径分布曲线

Figure 4. Adsorption isotherm and H-K pore size distribution of CrY

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图 5 改性后CrY分子筛和标准NaY分子筛红外光谱谱图

Figure 5. FT-IR spectra of CrY and NaY molecular sieve

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图 6 吸附时间对NaY及CrY吸附脱除模拟燃料中碱氮的影响

Figure 6. Effect of adsorption time on adsorption denitrification in model fuel of NaY and CrY

■: NaY adsorption capacity; ▼: CrY adsorption capacity; □: NaY removal rate; ▽: CrY removal rate

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图 7 吸附温度对CrY吸附脱除模拟燃料中碱氮的影响

Figure 7. Effect of adsorption temperature on adsorption denitrification in model fuel of CrY

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图 8 CrY吸附模拟燃料中喹啉的吸附等温线

Figure 8. Adsorption isotherm for CrY adsorption quinoline from model fuel

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图 9 吸附等温线L型和F型线性拟合曲线

Figure 9. Linear fitting of the Langmuir and Freundlich adsorption isotherm

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