Sulfuric Acid Modified Bentonite as the Support of Tetraethylenepentamine for CO2 Capture

详细信息    查看全文

• 作者：Weilong Wang ; Xiaoxing Wang ; Chunshan Song ; Xiaolan Wei ; Jing Ding ; Jing Xiao
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：March 21, 2013
• 年：2013
• 卷：27
• 期：3
• 页码：1538-1546
• 全文大小：406K
• 年卷期：v.27,no.3(March 21, 2013)
• ISSN：1520-5029

文摘

In this work, an inexpensive and commercially available bentonite was modified by sulfuric acid and explored as the new type of support to immobilize tetraethylenepentamine (TEPA) for CO₂ capture from flue gas. By applying sulfuric acid treatment, the textural properties, in particular, pore volume and surface area of bentonite, were significantly improved. Bentonite treated with 6 M sulfuric acid (Ben_H₂SO₄_6M) can reach a pore volume of 0.77 cc/g from that of the parent bentonite of 0.15 cc/g. With the maximum TEPA loading of 50 wt % onto the Ben_H₂SO₄_6M sorbent, the maximum CO₂ breakthrough sorption capacity reached 130 mg of CO₂/g of sorbent at 75 掳C under a dry condition. With an addition of moisture to the simulated flue gas, the CO₂ sorption capacity can be further improved to 190 mg of CO₂ at 18 vol% of moisture addition sorbent due to the bicarbonate formation under a wet condition. The TEPA/Ben_H₂SO₄_6M sorbents show a good regenerability and thermal stability below 130 掳C. The high CO₂ sorption capacity, positive effect of moisture addition, and low capital cost of the raw bentonite materials imply that TEPA/Ben_H₂SO₄_6M could be a promising sorbent for cost-efficient CO₂ capture from flue gas. The sulfuric acid treatment was demonstrated as an effective method for bentonite modification to immobilize TEPA for CO₂ capture.