铁掺杂改性SiO2的吸附脱氮性能研究

doi:10.19964/j.issn.1006-4990.2024-0533

Abstract

Abstract:

In order to build a new material with high efficiency for nitrogen removal，iron species were introduced into the sol-gel process in this work.SiFe-x，a ferrosilicon adsorption material with iron content of 3%~5%（mass ratio），was successfully prepared，and its adsorption and denitrification performance was studied through a fixed bed.The ferrosilicon adsorption material was characterized and analyzed using characterization methods such as X-ray diffraction（XRD），X-ray fluorescence spectrometer（XRF），nitrogen adsorption isotherm，and temperature programmed ammonia adsorption（NH₃-TPD）.The material was compared with amorphous silicon aluminum materials with relatively similar elemental composition and pore size to investigate the effect of acidity on nitride adsorption and removal performance.The results indicated that the adsorption capacity of nitrides was positively correlated with the amount of acid，but higher acid strength could make it difficult to remove nitrides，thereby reducing the regeneration efficiency of the adsorbent.SiFe-4 material had a high nitrogen saturation adsorption capacity（20.8 mg/g），and after 4 cycles of adsorption regeneration，it still retained an adsorption capacity of 15.4 mg/g，with a regeneration efficiency of 74.04%.The appropriate amount of acid and relatively low acid strength enabled SiFe-4 to balance adsorption capacity and regeneration ability，and outperform traditional mesoporous/microporous inorganic adsorption materials currently reported.It had certain application potential in the field of adsorption denitrification.

Key words: iron modification, silica, adsorption, denitrification

CLC Number:

TQ127.2

PANG Hao, LI Bin, SUN Zhenhai, GUO Jian, CAI Zhe, WU Luming, HONG Meihua, YANG Zhanfeng. Study on adsorption and denitrification performance of iron doped modified SiO₂[J]. Inorganic Chemicals Industry, 2025, 57(6): 49-55.

Figures/Tables 10

Fig.1

Table 1

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Table 2

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Table 3

Fig.5

Fig.6

Table 4

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样品名称	元素组成^a/%				孔结构			总酸量/（mmol·g^-1）
样品名称	w（SiO₂）	w（Fe₂O₃）	w（Al₂O₃）	w（杂质）	S_BET^b/（m²·g^-1）	V_Total/（cm³·g^-1）	D/nm	总酸量/（mmol·g^-1）
SiFe-3	96.75	2.98	0	0.27	625	0.55	3.5		0.498
SiFe-4	95.71	4.03	0	0.26	652	0.56	3.4		0.577
SiFe-5	94.77	4.97	0	0.26	651	0.54	3.3		0.616
SiAl-4	95.75	0	3.98	0.27	699	0.43	2.4		0.653

样品名称	静态饱和吸附量/（mg·g^-1）
样品名称	喹啉	苯胺	吡啶
SiFe-3	22.8	17.4	13.6
SiFe-4	25.7	20.1	15.9
SiFe-5	28.0	21.9	17.3
SiAl-4	30.6	24.1	20.4

样品名称	模拟油动态穿透		真实油动态穿透
样品名称	穿透吸附量/（mg·g^-1）	饱和吸附量/ （mg·g^-1）	穿透吸附量/ （mg·g^-1）	饱和吸附量/ （mg·g^-1）
SiFe-3	21.4	25.7	12.8	18.1
SiFe-4	23.8	27.6	14.3	20.8
SiFe-5	26.2	34.8	15.7	25.3
SiAl-4	29.7	40.2	17.8	30.6

样品名称	饱和吸附量/（mg·g^-1）		再生方式
样品名称	新鲜剂	循环1次的再生剂	再生方式
SiFe-4	20.80	15.6	溶剂再生+热氮气吹扫
Zn-MCM-41^［20］	17.79
Ni-Cr-Y^［21］	3.97
硅胶负载5%磷钼酸^［19］	2.09	1.86	焙烧550 ℃，5 h

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Study on adsorption and denitrification performance of iron doped modified SiO₂

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Study on adsorption and denitrification performance of iron doped modified SiO2