氧化镁基二氧化碳吸附剂的制备及改性研究进展

doi:10.19964/j.issn.1006-4990.2022-0635

Abstract

Abstract:

The increasing concentration of CO₂ will cause environmental problems such as global warming，sea level rise and glacier melting，so it is urgent to develop CO₂ capture technology.As an ideal CO₂ adsorbent，MgO has become a research hotspot.The preparation methods of MgO-based CO₂ adsorbents were reviewed，and the changes in MgO-specific surface area，CO₂ adsorption capacity and cyclic stability prepared by different methods were discussed.It was found that the MgO prepared by precipitation and sol-gel methods had larger specific surface areas and more alkaline sites，which effectively improved its ability to capture CO₂.The CO₂ capture ability of MgO-based adsorbents prepared by the molten salt doping modification method was significantly improved，and the CO₂ adsorption capacity was still high after repeated adsorption and desorption cycles.In the future，the research on MgO-based CO₂ adsorbents would mainly focus on the modification methods，process conditions optimization and capture mechanism of MgO，so as to promote the industrial application of MgO-based CO₂ adsorbents.

Key words: CO₂, MgO, adsorbent, molten salts

CLC Number:

TQ424.2

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.

Figures/Tables 4

Table 1

Table 2

Fig.1

Table 3

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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^［24］	直接煅烧	400 ℃，空气，2 h	252.0	50 ℃，纯CO₂，240 min	1.73
Mg（NO₃）₂·6H₂O^［25］	直接煅烧	500 ℃，空气，12 h	13.5	100 ℃，纯CO₂，15 min	0.35
Mg（OH）₂^［25］	直接煅烧	500 ℃，空气，12 h	156.0	100 ℃，纯CO₂，15 min	1.28
菱镁矿^［26］	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^［27］	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^［28］	沉淀	450 ℃，空气，－	211.3	50 ℃，15% CO₂、85% N₂（体积分数），240 min	1.01
MgCl₂·6H₂O^［22］	沉淀	450 ℃，－，2 h	46.7	200 ℃，10% CO₂、90% N₂（体积分数），－	1.55
Mg（NO₃）₂·6H₂O^［29］	沉淀	500 ℃，空气，9 h	331.0	25 ℃，纯CO₂，120 min	1.56
（CH₃COO）₂Mg·4H₂O^［28］	溶胶-凝胶	550 ℃，空气，－	156.5	50 ℃，15% CO₂、85% N₂（体积分数），240 min	1.38
MgCl₂·6H₂O^［22］	固相反应	500 ℃，－，2 h	100.0	200 ℃，10% CO₂、90% N₂（体积分数），－	2.39
Mg（OCH₃）₂^［30］	气凝胶	450 ℃，纯N₂，5 h	686.0	30 ℃，15% CO₂、85% N₂（体积分数），60 min	1.38

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^［31］	Cd（Ac）₂·2H₂O	MgO-CdO	共沉淀	41.9	300 ℃，纯CO₂，60 min	9.55
Mg₅（CO₃）₄（OH）₂·4H₂O^［44］	ZrO（OH）₂·xH₂O	MgO-ZrO₂	机械研磨	－	330 ℃，纯CO₂，180 min	7.50
Mg（NO₃）₂·6H₂O^［45］	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^［46］	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^［35］	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^［38］	甘蔗渣	MgO-C	共煅烧	111.3	35 ℃，纯CO₂，180 min	5.34
MgCl₂⋅6H₂O^［47］	稻壳	MgO-C	共煅烧	44.0	200 ℃，10% CO₂、90% N₂（体积分数），－	4.56

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^［41］	NaNO₃	直接研磨	－	330 ℃，纯CO₂，60 min	15.00
Mg（NO₃）₂·6H₂O^［42］	LiNO₃/NaNO₃/KNO₃	水溶	－	300 ℃，纯CO₂，240 min	13.45
4MgCO₃·Mg（OH）₂·4H₂O^［48］	NaNO₃	水溶	28.90	350 ℃，纯CO₂，240 min	17.00
MgO^［49］	K₂CO₃/KNO₃/NaNO₃	水溶	28.87	300 ℃，10% CO₂（体积分数），240 min	15.45
MgO^［43］	LiNO₃/KNO₃/Na₂CO₃/K₂CO₃	醇溶	－	325 ℃，纯CO₂，240 min	19.06
Mg（CH₃COO）₂·4H₂O^［50］	NaNO₃/NaNO₂	醇溶	23.00	350 ℃，85% CO₂（体积分数），50 min	19.80
［CH₃COCHC（O）CH₃］₂Mg.2H₂O^［51］	LiNO₃/NaNO₂/KNO₂	醇溶	－	340 ℃，纯CO₂，240 min	15.70

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Research progress of preparation and modification of MgO-based CO₂ adsorbents

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