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首页> 外文会议>Air and Waste Management Association annual conference and exhibition >Effect of Pore Size Distribution of Activated Carbon Fiber Cloth on Irreversible Adsorption of a Volatile Organic Vapor
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Effect of Pore Size Distribution of Activated Carbon Fiber Cloth on Irreversible Adsorption of a Volatile Organic Vapor

机译：活性炭纤维布孔径分布对挥发性有机蒸气不可逆吸附的影响

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Activated carbon fiber cloth (ACFC) is an effective adsorbent for capturing organic vapors from industrial sources and can undergo direct electrothermal regeneration. The effect of ACFC pore size distribution (PSD) on the irreversible adsorption of organic vapors typically emitted from automotive painting operations was investigated in this study. Three ACFCs (ACC10, ACC15, and ACC20) with varying activation levels resulting in different pore size distributions were used to capture 1,2, 4-trimethylbenzene. As activation level increases (from ACC10 to ACC15 to ACC20), BET surface area (807 - 1917 m~2/g), total pore volume (0.33 - 0.74 cm~3/g), and average pore width (0.7 - 0.8 nm) also increase. After five consecutive adsorption-regeneration cycles, cumulative heel percentage was similar for all adsorbents (3.5 - 4.5 wt%). There was, however, a 64% reduction in ACC10's adsorption capacity, but no reduction in capacity for ACC15 and ACC20. This was confirmed by changes in breakthrough time during the aforementioned adsorption/regeneration cycles. For ACC10, breakthrough time decreased by 55% after the first cycle, and breakthrough occurred immediately after the 3rd cycle. On the other hand, breakthrough time for ACC15 and ACC20 minimally decreased (＜ 10%) after 5 cycles. Increasing ACC10's regeneration temperature from 288 °C to 400 °C, in an effort to prevent these losses in capacity, created a worse scenario where adsorption capacity was reduced by 78% after five cycles despite having less heel. It is proposed that these observations are the result of an adsorbate that is bulkier than the primary pores in ACC10 which, on average, are narrower than the pores in ACC15 and ACC20. Irreversible adsorption of the adsorbate in the smaller pores of ACC10 led to obstruction of the pores, while the larger pores of ACC15 and ACC20 could still accommodate the adsorbate. These results help to explain the mechanisms of irreversible adsorption during the adsorption of organic compounds on activated carbon fiber cloth.
机译：活性碳纤维布（ACFC）是一种有效的吸附剂，可以捕获工业来源的有机蒸气，并且可以进行直接的电热再生。在这项研究中，研究了ACFC孔径分布（PSD）对汽车喷涂操作中通常排放的有机蒸气不可逆吸附的影响。三种具有不同活化水平（导致不同的孔径分布）的ACFC（ACC10，ACC15和ACC20）用于捕获1,2，4-三甲基苯。随着活化水平的提高（从ACC10到ACC15到ACC20），BET表面积（807-1917 m〜2 / g），总孔体积（0.33-0.74 cm〜3 / g）和平均孔宽度（0.7-0.8 nm） ）也增加了。经过五个连续的吸附-再生循环后，所有吸附剂的累积后跟百分比均相似（3.5-4.5 wt％）。但是，ACC10的吸附容量降低了64％，但ACC15和ACC20的吸附容量并未降低。通过上述吸附/再生循环中穿透时间的变化证实了这一点。对于ACC10，穿透时间在第一个循环后减少了55％，而穿透在第三个循环后立即发生。另一方面，经过5个循环后，ACC15和ACC20的穿透时间最少减少（＜10％）。为了防止这些容量损失，将ACC10的再生温度从288°C升高到400°C，造成了更糟的情况，即尽管脚跟较少，但五个循环后吸附容量却降低了78％。提出这些观察结果是由于吸附物比ACC10中的初级孔要大，而这些孔平均比ACC15和ACC20中的孔要窄。被吸附物在ACC10较小孔中的不可逆吸附导致孔阻塞，而ACC15和ACC20较大孔仍可容纳被吸附物。这些结果有助于解释在活性炭纤维布上有机化合物的吸附过程中不可逆吸附的机理。

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