化工学报 ›› 2022, Vol. 73 ›› Issue (1): 402-410.DOI: 10.11949/0438-1157.20211298
收稿日期:
2021-09-07
修回日期:
2021-10-26
出版日期:
2022-01-05
发布日期:
2022-01-18
通讯作者:
钟梅
作者简介:
张照曦(1993—),男,硕士研究生,基金资助:
Zhaoxi ZHANG(),Mei ZHONG(),Jian LI, YALKUN·Tursun
Received:
2021-09-07
Revised:
2021-10-26
Online:
2022-01-05
Published:
2022-01-18
Contact:
Mei ZHONG
摘要:
采用机械球磨法制得不同Zr含量的改性蒙脱土催化剂,通过X射线衍射仪(XRD)、物理吸附仪(BET)和化学吸附仪(NH3-TPD)表征其结构特征,在固定床中考察催化剂对煤热解产物分布和焦油品质的影响规律,基于模型化合物苄基苯基醚(BPE)、联苄和联苯的热解行为分析,探讨了催化剂对煤中共价键断裂规律的作用机制。结果表明:酸洗可增加蒙脱土的比表面积,添加Zr后该值先减小后增加,酸性与之相反,当Zr含量为24%(质量)(24ZrAM)时,催化剂的酸量与强酸强度达最高。在xZrAM的作用下,热解焦油产率和沥青含量均下降,特别是24ZrAM对焦油的提质活性最好,轻油组分分率最高,为53.2%(质量),长链烃含量降低了22.1%,酚类化合物增加了22.5%。BPE、联苄和联苯的转化率分别比无催化剂时提高了87.2%、63.2%和31.3%,说明24ZrAM可促进长链烃裂解和Cal—O、Cal—Cal和Car—Car键的断裂。
中图分类号:
张照曦,钟梅,李建,亚力昆江?吐尔逊. 改性蒙脱土对新疆和丰煤热解行为的影响[J]. 化工学报, 2022, 73(1): 402-410.
Zhaoxi ZHANG,Mei ZHONG,Jian LI, YALKUN·Tursun. Effect of modified montmorillonite on the pyrolysis behavior of Xinjiang Hefeng coal[J]. CIESC Journal, 2022, 73(1): 402-410.
Sample | Proximate analysis/%(mass) | Ultimate analysis/%(mass,daf) | |||||||
---|---|---|---|---|---|---|---|---|---|
Ad | Vdaf | FCdaf① | C | H | O① | N | S | ||
raw coal | 22.83 | 47.47 | 52.53 | 72.06 | 5.64 | 19.07 | 3.00 | 0.23 | |
DC | 1.10 | 44.98 | 55.02 | 61.17 | 4.93 | 30.86 | 2.83 | 0.21 |
表1 煤样分析
Table 1 Analysis of coal samples
Sample | Proximate analysis/%(mass) | Ultimate analysis/%(mass,daf) | |||||||
---|---|---|---|---|---|---|---|---|---|
Ad | Vdaf | FCdaf① | C | H | O① | N | S | ||
raw coal | 22.83 | 47.47 | 52.53 | 72.06 | 5.64 | 19.07 | 3.00 | 0.23 | |
DC | 1.10 | 44.98 | 55.02 | 61.17 | 4.93 | 30.86 | 2.83 | 0.21 |
Sample | BET surface area /(m2/g) | Pore volume / (cm3/g) | Average pore size /nm |
---|---|---|---|
RM | 55 | 0.09 | 7.73 |
AM | 113 | 0.17 | 3.02 |
8ZrAM | 80 | 0.14 | 8.04 |
16ZrAM | 81 | 0.13 | 8.12 |
24ZrAM | 93 | 0.12 | 6.58 |
32ZrAM | 100 | 0.12 | 6.14 |
表2 催化剂的孔结构特征
Table 2 Pore texture properties of the catalysts
Sample | BET surface area /(m2/g) | Pore volume / (cm3/g) | Average pore size /nm |
---|---|---|---|
RM | 55 | 0.09 | 7.73 |
AM | 113 | 0.17 | 3.02 |
8ZrAM | 80 | 0.14 | 8.04 |
16ZrAM | 81 | 0.13 | 8.12 |
24ZrAM | 93 | 0.12 | 6.58 |
32ZrAM | 100 | 0.12 | 6.14 |
Components | Relative content/% | |
---|---|---|
DC | 24ZrAM | |
aliphatic hydrocarbons | 52.71 | 52.01 |
b.p. above 300℃ | 40.74 | 31.74 |
aromatic hydrocarbons | 35.10 | 39.73 |
benzenes | 5.98 | 6.19 |
phenols | 18.27 | 22.74 |
naphthalenes | 8.65 | 8.79 |
indenes | 2.20 | 2.01 |
other heteroatom compounds beyond phenol derivatives | 12.19 | 9.26 |
表3 焦油的成分分析
Table 3 Composition analysis of tar
Components | Relative content/% | |
---|---|---|
DC | 24ZrAM | |
aliphatic hydrocarbons | 52.71 | 52.01 |
b.p. above 300℃ | 40.74 | 31.74 |
aromatic hydrocarbons | 35.10 | 39.73 |
benzenes | 5.98 | 6.19 |
phenols | 18.27 | 22.74 |
naphthalenes | 8.65 | 8.79 |
indenes | 2.20 | 2.01 |
other heteroatom compounds beyond phenol derivatives | 12.19 | 9.26 |
图7 MeOH-BPE的热解产物分布及BPE的转化率(a)和气体产率(b)
Fig.7 Products distribution and BPE conversion (a) and gas components (b) from MeOH-BPE pyrolysis over catalysts
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