高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (3): 20230474.doi: 10.7503/cjcu20230474
收稿日期:
2023-11-13
出版日期:
2024-03-10
发布日期:
2023-12-29
通讯作者:
孟庆华
E-mail:qhmeng@sjtu.edu.cn
Received:
2023-11-13
Online:
2024-03-10
Published:
2023-12-29
Contact:
MENG Qinghua
E-mail:qhmeng@sjtu.edu.cn
摘要:
研究了湿度和有机物小分子等储存耐候条件对声学增强材料谐振频率偏移值的影响, 探讨了由不同硅铝比分子筛组成的声学增强材料在不同湿度及有机物小分子气氛中储存后的谐振频率及偏移值的变化规律. 研究结果表明, 由既定硅铝比分子筛组成的声学增强材料在25 ℃/50%相对湿度(RH)和25 ℃/95%RH条件下储存后, 其谐振频率偏移值未发生明显变化. 氮气吸附实验结果表明, 25 ℃下氮气分子占据了较少的比表面积, 水分子的存在不影响声学增强材料对氮气分子的吸附. 在25 ℃/50%RH条件下放置后, 声学增强材料在25 ℃/95%RH条件下吸附的水分子会逐渐脱附. 声学增强材料在不同种类有机物小分子气氛中储存后, 其谐振频率偏移值呈不同的变化趋势. 对于尺寸较小的有机物小分子, 由于存在可逆吸附, 声学增强材料的谐振频率偏移值未有明显变化; 对于尺寸较大或具有小尺寸端基基团的有机物小分子, 由于存在嵌入式吸附, 声学增强材料的谐振频率偏移值明显降低.
中图分类号:
TrendMD:
孟庆华, 史超. 分子筛型声学增强材料的储存耐候性能. 高等学校化学学报, 2024, 45(3): 20230474.
MENG Qinghua, SHI Chao. Storage Weathering Resistance of Zeolitic Acoustically Enhanced Materials. Chem. J. Chinese Universities, 2024, 45(3): 20230474.
Cell parameter | Orthorhombic | Monoclinic | Cell parameter | Orthorhombic | Monoclinic |
---|---|---|---|---|---|
a/nm | 2.0070 | 2.0107 | β/(°) | 90 | 90 |
b/nm | 1.9920 | 1.9879 | γ/(°) | 90 | 90 |
c/nm | 1.3420 | 1.3369 | Space group | Pnma | P21/n |
α/(°) | 90 | 90.67 |
Table 1 Cell parameters of MFI under orthorhombic and monoclinic crystal systems[14]
Cell parameter | Orthorhombic | Monoclinic | Cell parameter | Orthorhombic | Monoclinic |
---|---|---|---|---|---|
a/nm | 2.0070 | 2.0107 | β/(°) | 90 | 90 |
b/nm | 1.9920 | 1.9879 | γ/(°) | 90 | 90 |
c/nm | 1.3420 | 1.3369 | Space group | Pnma | P21/n |
α/(°) | 90 | 90.67 |
Fig.2 N2 adsorption⁃desorption isotherms(‒196 ℃) of zeolitic AEMs with various SARs(A) and pore size distribution of MFI_50(B), MFI_106(C) and MFI_195(D)“+10” implies the increasement with 10 cm3/g, STP from previous one.
Sample | SAR | Composition | Stotal/(m2·g-1) | Vtotal/(mL·g-1) | Vmicro/(cm3·g-1) | Monolayer N2 adsorptionVm/(cm3·g-1, STP) |
---|---|---|---|---|---|---|
MFI_50 | 49.5 | Si94.1Al1.9O192Na1.9 | 328.47 | 0.2006 | 0.1235 | 75.467 |
MFI_106 | 105.7 | Si95.1Al0.9O192Na0.9 | 393.66 | 0.2393 | 0.1726 | 90.445 |
MFI_195 | 194.9 | Si95.51Al0.49O192Na0.49 | 415.42 | 0.2466 | 0.1761 | 95.444 |
MFI_383 | 383.0 | Si95.75Al0.25O192Na0.25 | 429.05 | 0.1932 | 0.1796 | 98.576 |
MFI_1713 | 1713.3 | Si95.944Al0.056O192Na0.056 | 451.09 | 0.1882 | 0.1791 | 103.64 |
Table 2 Chemical compositions and textural properties of MFI zeolite with various SARs*
Sample | SAR | Composition | Stotal/(m2·g-1) | Vtotal/(mL·g-1) | Vmicro/(cm3·g-1) | Monolayer N2 adsorptionVm/(cm3·g-1, STP) |
---|---|---|---|---|---|---|
MFI_50 | 49.5 | Si94.1Al1.9O192Na1.9 | 328.47 | 0.2006 | 0.1235 | 75.467 |
MFI_106 | 105.7 | Si95.1Al0.9O192Na0.9 | 393.66 | 0.2393 | 0.1726 | 90.445 |
MFI_195 | 194.9 | Si95.51Al0.49O192Na0.49 | 415.42 | 0.2466 | 0.1761 | 95.444 |
MFI_383 | 383.0 | Si95.75Al0.25O192Na0.25 | 429.05 | 0.1932 | 0.1796 | 98.576 |
MFI_1713 | 1713.3 | Si95.944Al0.056O192Na0.056 | 451.09 | 0.1882 | 0.1791 | 103.64 |
Fig.4 Amount of hydration of zeolitic AEM with various SARs after storage for different time at 25 ℃/50%RHVAC means storage in vacuum at 80 ℃ for 2 h.
Fig.5 FTIR spectra of zeolitic AEMs with various SARs after storage at 25 ℃/50%RH for 168 hInset: zeolitic AEM’s transmittance between 3000 and 3800 cm-1; “+5” implies the increasement with 5% transmittance from previous one.
Fig.6 XRD patterns of zeolitic AEMs with various SARs after storage at 25 ℃/50%RH for 168 hInset: the evolution details of diffraction peaks between 24° and 30°.
Fig.7 ΔF0 of zeolitic AEMs with various SARs stored for different time at 25 ℃/50%RH after storage in vacuum at 80 ℃ for 2 h(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Fig.8 N2 adsorption⁃desorption isotherms(25 ℃) of zeolitic AEMs after 168 h storage at 25 ℃/50%RH(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Sample | SAR | Monolayer N2 adsorption Vm/(cm3·g-1, STP) |
---|---|---|
MFI_50 | 49.5 | 4.8152 |
MFI_106 | 105.7 | 5.2029 |
MFI_195 | 194.9 | 5.8008 |
MFI_383 | 383.0 | 6.2827 |
MFI_1713 | 1713.3 | 6.2804 |
Table 3 Monolayer N2 adsorption(25 ℃) of zeolitic AEMs after 168 h storage under 25 ℃/50%RH
Sample | SAR | Monolayer N2 adsorption Vm/(cm3·g-1, STP) |
---|---|---|
MFI_50 | 49.5 | 4.8152 |
MFI_106 | 105.7 | 5.2029 |
MFI_195 | 194.9 | 5.8008 |
MFI_383 | 383.0 | 6.2827 |
MFI_1713 | 1713.3 | 6.2804 |
Fig.10 FTIR spectra of zeolitic AEMs with various SARs after 168 h storage at 25 ℃/95%RHInset: zeolitic AEM’s transmittance between 2750 and 4000 cm-1.
Fig.11 XRD patterns of zeolitic AEM with various SARs after 168 h storage at 25 ℃/95%RHInset: the evolution details of diffraction peaks between 24° and 30°.
Fig.12 ΔF0 of zeolitic AEM with various SARs stored for different time at 25 ℃/95%RH after storage in vacuum at 80 ℃ for 2 h(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Fig.13 N2 adsorption⁃desorption isotherms(25 ℃) of zeolitic AEMs after 168 h storage at 25 ℃/95%RH(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Sample | SAR | Monolayer N2 adsorptionVm/(cm3·g-1, STP) | Sample | SAR | Monolayer N2 adsorptionVm/(cm3·g-1, STP) |
---|---|---|---|---|---|
MFI_50 | 49.5 | 4.0086 | MFI_383 | 383.0 | 6.0360 |
MFI_106 | 105.7 | 4.9216 | MFI_1713 | 1713.3 | 6.0197 |
MFI_195 | 194.9 | 5.4134 |
Table 4 Monolayer N2 adsorption(25 ℃) of zeolitic AEM after 168 h storage at 25 ℃/95%RH
Sample | SAR | Monolayer N2 adsorptionVm/(cm3·g-1, STP) | Sample | SAR | Monolayer N2 adsorptionVm/(cm3·g-1, STP) |
---|---|---|---|---|---|
MFI_50 | 49.5 | 4.0086 | MFI_383 | 383.0 | 6.0360 |
MFI_106 | 105.7 | 4.9216 | MFI_1713 | 1713.3 | 6.0197 |
MFI_195 | 194.9 | 5.4134 |
Fig.15 ΔF0 of zeolitic AEM with various SARs stored for different time at 25 ℃/50%RH after 168 h storage at 25 ℃/95%RH(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Fig.16 ΔF0 of zeolitic AEMs with various SARs stored for different time in volatile toluene after storage in vacuum at 80 ℃ for 2 h(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Fig.17 ΔF0 of zeolitic AEMs with various SARs stored for different time at 25 ℃/50%RH after 24 h storage in volatile toluene(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Fig.18 ΔF0 of zeolitic AEM with various SARs stored for different time in volatile DMPA after storage in vacuum at 80 ℃ for 2 h(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Fig.19 ΔF0 of zeolitic AEM with various SARs stored for different time at 25 ℃/50%RH after 24 h storage in volatile DMPA(A) MFI_50; (B) MFI_106; (C) MFI_195; (D) MFI_383; (E) MFI_1713.
Fig.20 XRD patterns of zeolitic AEMs with various SARs after 24 h storage in volatile toluene(A) and DMPA(B)Insets: the evolution details of diffraction peaks between 24° and 30°.
Fig.21 FTIR spectra of zeolitic AEMs with various SARs after 24 h storage in volatile toluene(A) and DMPA(B)Insets zeolitic AEMs’ transmittance between 2500 and 4000 cm-1. “+5” implies the increasement with 5% transmittance from previous one.
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