Preparation and Characterization of Cu(NO3)2 Modified Activated Carbon Adsorbents and Influencing Factors of H2S Adsorption

Q3 Chemical Engineering
J. Zhang, Mei Zhang, Yanxiu Liu, Xueqin Wang, Yuanyuan Wang
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引用次数: 0

Abstract

With the constant development and growth of the world’s economy, the demand for energy continues to rise. However, rising oil prices, increasing carbon emissions, and energy shortages will limit economic development and affect living standards. Therefore, further exploitation and utilization of natural gas are of great significance for the sustainable development of national economies and the improvement of civil life. Natural gas contains acidic gas, such as hydrogen sulfide (H2S), and can lead to physical safety issues, environmental pollution, equipment corrosion, and catalyst poisoning. Therefore, a desulfurization process, which has practical significance, must be carried out to reduce the H2S content to less than 20 mg•m−3. Currently, the main desulfurization processes involve dry and wet desulfurization methods. The wet desulfurization methods include physical, chemical, and physico-chemical solvent methods, which have a large processing capacity and involve a continuous operation sequence applied to the purification of natural gas containing a high sulfur content. The dry desulfurization methods, which use a solid as the desulfurizer, have high precision, easy operation, and low energy consumption. This method has been widely applied to advanced treatment. Activated carbon, which has a large surface area, large pore volume, and complex porous structure, is widely used as an adsorbent for desulfurization. When compared with other adsorbents, activated carbon has several advantages, such as a high adsorption capacity and low cost. The H2S removal performance of the adsorbent can be significantly improved after modification. In this study, using a low concentration of H2S and nitrogen to simulate raw fuel gas, cupric nitrate-modified activated carbon was used as the main adsorbent for desulfurization. The effect of the preparation conditions on the H2S removal performance was studied, and the adsorbents were characterized using a series of methods. Adsorption desulfurization In this study, a low concentration of H2S and nitrogen were used to simulate raw fuel gas, and cupric nitrate-modified activated carbon was used as an adsorbent. The results from structural analysis indicated a significant change in the surface structure of AC by introducing Cu(NO3)2. Cu(NO3)2 promoted the transformation of micropores into mesopores or macropores and active substances into the pores of AC for desulfurization. The effects of the preparation conditions on the H2S removal performance were studied using a fixed-bed adsorption column. The best preparation conditions for the Cu(NO3)2 modified activated carbon adsorbent involved: a Cu(NO3)2 impregnation concentration of 5%, impregnation time of 24 h, calcination temperature of 300 C, and calcination time of 2 h. The H2S saturation capacity and desulfurization rate reached 55.4 mg•g−1 and 98.92%, respectively. The H2S saturation capacity was improved by 38.2 mg•g−1 compared with unmodified activated carbon. In this paper, using a low concentration of H2S and nitrogen to simulate raw fuel gas, cupric nitrate modified activated carbon was used as the main adsorbent for desulfurization. The effect of the preparation conditions on the H2S removal performance was studied and the adsorbents characterized using a series of methods. In this study, a low concentration of H2S and nitrogen were used to simulate raw fuel gas, and cupric nitrate-modified activated carbon was used as an adsorbent. The experimental results showed that the H2S removal performance of the adsorbent was significantly improved using Cu(NO3)2 impregnated activated carbon. Without
Cu(NO3)2改性活性炭吸附剂的制备、表征及对H2S吸附的影响因素
随着世界经济的不断发展和增长,对能源的需求不断增加。然而,油价上涨、碳排放增加和能源短缺将限制经济发展并影响生活水平。因此,天然气的进一步开发利用对国民经济的可持续发展和公民生活的改善具有重要意义。天然气含有酸性气体,如硫化氢(H2S),会导致物理安全问题、环境污染、设备腐蚀和催化剂中毒。因此,必须进行具有实际意义的脱硫工艺,将H2S含量降至20 mg•m−3以下。目前,主要的脱硫工艺包括干法和湿法脱硫。湿法脱硫方法包括物理法、化学法和物理化学溶剂法,它们具有大的处理能力,并且涉及用于净化含硫量高的天然气的连续操作序列。以固体为脱硫剂的干法脱硫方法具有精度高、操作简便、能耗低等优点。这种方法已广泛应用于晚期治疗。活性炭具有大的表面积、大的孔体积和复杂的多孔结构,被广泛用作脱硫吸附剂。与其他吸附剂相比,活性炭具有吸附能力高、成本低等优点。改性后,吸附剂的H2S脱除性能可显著提高。本研究采用低浓度的H2S和氮气模拟原燃料气,以硝酸铜改性活性炭为主要吸附剂进行脱硫。研究了制备条件对H2S脱除性能的影响,并采用一系列方法对吸附剂进行了表征。吸附脱硫在本研究中,使用低浓度的H2S和氮气模拟原燃料气,并使用硝酸铜改性活性炭作为吸附剂。结构分析结果表明,通过引入Cu(NO3)2,AC的表面结构发生了显著变化。Cu(NO3)2促进了AC的微孔转化为中孔或大孔,活性物质转化为孔进行脱硫。采用固定床吸附柱研究了制备条件对H2S脱除性能的影响。Cu(NO3)2改性活性炭吸附剂的最佳制备条件为:Cu(NO2)2浸渍浓度为5%,浸渍时间为24h,煅烧温度为300℃C、 煅烧时间2h。H2S饱和能力和脱硫率分别达到55.4mg•g−1和98.92%。与未改性活性炭相比,H2S饱和能力提高了38.2 mg•g−1。本文采用低浓度的H2S和氮气模拟原燃料气,以硝酸铜改性活性炭为主要吸附剂进行脱硫。研究了制备条件对H2S脱除性能的影响,并采用一系列方法对吸附剂进行了表征。在本研究中,使用低浓度的H2S和氮气模拟原燃料气,并使用硝酸铜改性活性炭作为吸附剂。实验结果表明,Cu(NO3)2浸渍活性炭能显著提高吸附剂对H2S的去除性能。没有
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来源期刊
Recent Innovations in Chemical Engineering
Recent Innovations in Chemical Engineering Chemical Engineering-Chemical Engineering (all)
CiteScore
2.10
自引率
0.00%
发文量
20
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