无机盐工业 ›› 2023, Vol. 55 ›› Issue (8): 77-83.doi: 10.19964/j.issn.1006-4990.2022-0635
桂昌青1,2(), 王雅静1, 凌长见2, 王怀有3, 唐忠锋1,2,3()
收稿日期:
2022-10-30
出版日期:
2023-08-10
发布日期:
2023-08-25
通讯作者:
唐忠锋(1976— ),男,研究员,博士生导师,研究方向为能源材料化学、碳捕集和熔盐储能等;E-mail:tangzhongfeng@sinap.ac.cn。作者简介:
桂昌青(1997— ),男,硕士研究生,研究方向为碳捕集及熔盐储能;E-mail:guichangqing@sinap.ac.cn。
基金资助:
GUI Changqing1,2(), WANG Yajing1, LING Changjian2, WANG Huaiyou3, TANG Zhongfeng1,2,3()
Received:
2022-10-30
Published:
2023-08-10
Online:
2023-08-25
摘要:
CO2浓度的增加会引起全球变暖、海平面上升和冰川融化等环境问题,因此开发CO2捕集技术刻不容缓。MgO作为一种理想的CO2吸附剂已成为研究热点。综述了MgO基CO2吸附剂的制备方法,探讨了不同方法对MgO的比表面积、CO2吸附容量和循环稳定性的影响。研究发现,采用沉淀法和溶胶-凝胶法制备的MgO具有更大的比表面积和更多的碱性位点,有效地提高了其捕集CO2的能力;采用熔盐掺杂改性法制备的MgO基吸附剂对CO2捕集能力显著提高,多次吸-脱附循环后仍保持较高的CO2吸附容量。未来对MgO基CO2吸附剂的研究主要集中在MgO的改性方法、工艺条件优化和捕集机制等方面,进而推进MgO基CO2吸附剂的工业化应用。
中图分类号:
桂昌青, 王雅静, 凌长见, 王怀有, 唐忠锋. 氧化镁基二氧化碳吸附剂的制备及改性研究进展[J]. 无机盐工业, 2023, 55(8): 77-83.
GUI Changqing, WANG Yajing, LING Changjian, WANG Huaiyou, TANG Zhongfeng. Research progress of preparation and modification of MgO-based CO2 adsorbents[J]. Inorganic Chemicals Industry, 2023, 55(8): 77-83.
表1
不同方法制备的MgO及其对CO2的吸附性能
镁源前驱体 | 制备方法 | 煅烧条件 | 比表面积/ (m2·g-1) | CO2吸附条件 | 最大吸附容 量/(mmol·g-1) |
---|---|---|---|---|---|
Mg(Ac)2·4H2O[ | 直接煅烧 | 400 ℃,空气,2 h | 252.0 | 50 ℃,纯CO2,240 min | 1.73 |
Mg(NO3)2·6H2O[ | 直接煅烧 | 500 ℃,空气,12 h | 13.5 | 100 ℃,纯CO2,15 min | 0.35 |
Mg(OH)2[ | 直接煅烧 | 500 ℃,空气,12 h | 156.0 | 100 ℃,纯CO2,15 min | 1.28 |
菱镁矿[ | 直接煅烧 | 550 ℃,空气,4 h | 118.6 | 60 ℃,10% CO2、90% N2(体积分数),- | 1.82 |
水镁矿[ | 直接煅烧 | 550 ℃,空气,0.5 h | 102.9 | 200 ℃,10% CO2、90% N2(体积分数),- | 1.73 |
MgSO4·7H2O[ | 沉淀 | 450 ℃,空气,- | 211.3 | 50 ℃,15% CO2、85% N2(体积分数),240 min | 1.01 |
MgCl2·6H2O[ | 沉淀 | 450 ℃,-,2 h | 46.7 | 200 ℃,10% CO2、90% N2(体积分数),- | 1.55 |
Mg(NO3)2·6H2O[ | 沉淀 | 500 ℃,空气,9 h | 331.0 | 25 ℃,纯CO2,120 min | 1.56 |
(CH3COO)2Mg·4H2O[ | 溶胶-凝胶 | 550 ℃,空气,- | 156.5 | 50 ℃,15% CO2、85% N2(体积分数),240 min | 1.38 |
MgCl2·6H2O[ | 固相反应 | 500 ℃,-,2 h | 100.0 | 200 ℃,10% CO2、90% N2(体积分数),- | 2.39 |
Mg(OCH3)2[ | 气凝胶 | 450 ℃,纯N2,5 h | 686.0 | 30 ℃,15% CO2、85% N2(体积分数),60 min | 1.38 |
表2
不同方法制备的MgO复合吸附剂及其对CO2吸附性能
镁源前驱体 | 掺杂材料 | 吸附剂 | 制备 方法 | 比表面积/ (m2·g-1) | 吸附条件 | 最大吸附容量/(mmol·g-1) |
---|---|---|---|---|---|---|
Mg(Ac)2·4H2O[ | Cd(Ac)2·2H2O | MgO-CdO | 共沉淀 | 41.9 | 300 ℃,纯CO2,60 min | 9.55 |
Mg5(CO3)4(OH)2·4H2O[ | ZrO(OH)2·xH2O | MgO-ZrO2 | 机械研磨 | - | 330 ℃,纯CO2,180 min | 7.50 |
Mg(NO3)2·6H2O[ | γ-Al2O3 | MgO-Al2O3 | 浸渍 | 200.9 | 60 ℃,13% CO2、87% N2(体积分数),60 min | 1.36 |
Mg(NO3)2·6H2O[ | Al(NO3)3·9H2O | MgO-Al2O3 | 共煅烧 | 177.0 | 200 ℃,10% CO2、90% N2(体积分数),60 min | 2.98 |
Mg(NO3)2·6H2O[ | D-葡萄糖和尿素 | MgO-C | 牺牲模板 | 121.3 | 300 ℃,纯CO2,60 min | 7.75 |
无水MgCl2[ | 甘蔗渣 | MgO-C | 共煅烧 | 111.3 | 35 ℃,纯CO2,180 min | 5.34 |
MgCl2⋅6H2O[ | 稻壳 | MgO-C | 共煅烧 | 44.0 | 200 ℃,10% CO2、90% N2(体积分数),- | 4.56 |
表3
熔盐掺杂MgO的制备方法及其CO2吸附容量
镁源前驱体 | 掺杂熔盐 | 掺杂方法 | 比表面积/ (m2·g-1) | CO2吸附条件 | 最大吸附容 量/(mmol·g-1) |
---|---|---|---|---|---|
Mg5(CO3)4(OH)2·xH2O[ | NaNO3 | 直接研磨 | - | 330 ℃,纯CO2,60 min | 15.00 |
Mg(NO3)2·6H2O[ | LiNO3/NaNO3/KNO3 | 水溶 | - | 300 ℃,纯CO2,240 min | 13.45 |
4MgCO3·Mg(OH)2·4H2O[ | NaNO3 | 水溶 | 28.90 | 350 ℃,纯CO2,240 min | 17.00 |
MgO[ | K2CO3/KNO3/NaNO3 | 水溶 | 28.87 | 300 ℃,10% CO2(体积分数),240 min | 15.45 |
MgO[ | LiNO3/KNO3/Na2CO3/K2CO3 | 醇溶 | - | 325 ℃,纯CO2,240 min | 19.06 |
Mg(CH3COO)2·4H2O[ | NaNO3/NaNO2 | 醇溶 | 23.00 | 350 ℃,85% CO2(体积分数),50 min | 19.80 |
[CH3COCHC(O)CH3]2Mg.2H2O[ | LiNO3/NaNO2/KNO2 | 醇溶 | - | 340 ℃,纯CO2,240 min | 15.70 |
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