發(fā)布時間：2018-06-27 21:49

  本文選題：多級孔碳材料 + SBA-15�。� 參考：《東南大學(xué)》2017年碩士論文

【摘要】：多級孔碳材料作為一種新型的碳材料,近年來受到研究者們的廣泛關(guān)注。它克服了傳統(tǒng)多孔碳材料結(jié)構(gòu)單一的缺點,結(jié)合了不同級別孔徑的結(jié)構(gòu)特點。其中多級微孔-介孔碳材料結(jié)合了微孔和介孔結(jié)構(gòu)的特征,具有比表面積大、孔容高、機械強度高、化學(xué)惰性和熱穩(wěn)定性好等優(yōu)點,現(xiàn)已被廣泛的應(yīng)用于多個領(lǐng)域。大氣中CO2濃度的急劇上升是造成溫室效應(yīng)的主要因素,而尋找合適的吸附劑用于吸收煙道氣中的CO2則是目前解決該問題最直接有效的手段。因此,本論文研究簡單的方法合成多級孔碳材料,對其進行優(yōu)化并用于CO2吸附過程。采用多步法以SBA-15為硬模板合成多級孔碳材料,考察了浸潰次數(shù)、碳化溫度、碳化時間對介孔碳結(jié)構(gòu)的影響,最佳合成條件下的介孔碳經(jīng)CO2活化處理制備多級孔碳,并考察了活化時間和活化溫度對材料結(jié)構(gòu)和C02吸附性能的影響。結(jié)果表明浸漬兩次、900℃碳化4 h的介孔碳具有最佳的孔道結(jié)構(gòu),該條件下的介孔碳在900℃活化4 h后得到的多級孔碳的比表面積達到2124.9 m2/g,總孔容達到2.27 cm3/g,C02的吸附量達到3.41 mmol/g。采用一步法以F127為軟模板合成多級孔碳材料,考察了水熱溫度、模板劑用量、碳化溫度及TEOS添加量對多級孔碳結(jié)構(gòu)的影響,結(jié)果表明水熱溫度130℃、F127用量0.5 g、碳化溫度800℃及TEOS添加量11 mL是最佳合成條件。將該條件下的多級孔碳進行C02活化,結(jié)果表明在900℃下活化4h后,材料的比表面積、總孔容和CO2吸附量分別由1574.2 m2/g、1.19 cm3/g、2.32 mmol/g 升高至 2437.6 m2/g、2.17 cm3/g、3.60 mmol/g。采用一步法以DDAC為軟模板合成多級孔碳材料,考察了水熱溫度、模板劑用量、TEOS添加量及碳化溫度對多級孔碳材料結(jié)構(gòu)的影響,表明水熱溫度110℃、F127用量1.0g、TEOS添加量9mL及碳化溫度700℃為最佳合成條件。將該條件下的多級孔碳進行C02活化,結(jié)果表明在900℃活化4 h后,材料的比表面積、總孔容和CO2吸附量分別由1704.0 m2/g、1.09 cm3/g、2.11 mmol/g升高至 2526.6 m2/g、1.84 cm3/g、3.54 mmol/g。
[Abstract]:As a new type of carbon materials, multilevel porous carbon materials have been paid more and more attention by researchers in recent years. It overcomes the shortcoming of single structure of traditional porous carbon materials and combines the structural characteristics of different pore sizes. Multistage microporous and mesoporous carbon materials have been widely used in many fields due to their high specific surface area, high pore capacity, high mechanical strength, high chemical inertia and good thermal stability due to the combination of micropore and mesoporous structure. The sharp increase of CO _ 2 concentration in the atmosphere is the main factor causing Greenhouse Effect, and finding suitable adsorbent to absorb CO _ 2 in flue gas is the most direct and effective way to solve this problem. Therefore, a simple method for synthesizing multilevel porous carbon materials has been studied in this paper, and optimized for CO2 adsorption process. The effects of immersion times, carbonation temperature and carbonation time on the structure of mesoporous carbon were investigated by using SBA-15 as hard template. The mesoporous carbon was prepared by CO2 activation under the optimum synthesis conditions. The effects of activation time and activation temperature on the structure and adsorption properties of CO2 were investigated. The results show that the mesoporous carbon impregnated twice at 900 鈩，

本文編號：2075392