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Study of adsorbent prepared from oil palm ash (OPA) for flue gas desulfurization

机译：用油棕灰（OPA）制备的烟气脱硫吸附剂的研究

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Siliceous material such as oil palm ash (OPA) can be utilized as an active adsorbent for flue gas desulfurization using hydration process.The Brunauer-Emmet-Teller (BET) surface area of this type of adsorbent depends largely on the adsorbent preparation variables.In the present study,the influence of four adsorbent preparation variables;hydration period (x_1),ratio of OPA to CaO/Ca(OH)_2 (x_2),amount of CaSO_4 (x_3) and CaO or Ca(OH)_2 (x_4) on the adsorbent BET surface area were studied using a 2~4 full factorial central composite design (CCD) in response surface methodology (RSM).It was found that all the adsorbent preparation variables except for the amount of CaSO_4 (x_3 ) had significant influence on the adsorbent surface area.Higher hydration period (x_1=30 h) and ratio of OPA to CaO/Ca(OH)_2 (x_2=3:1) gave a positive effect on the adsorbent BET surface area.The use of Ca(OH)_2 instead of CaO as the starting material produced adsorbent with a higher surface area.The adsorbent with maximum surface area of 134.2 m~2/g was prepared from Ca(OH)_2 as the starting material.Activity tests showed that the desulfurization activity of adsorbent prepared by hydrating OPA with CaO/Ca(OH)_2/CaSO_4 was much higher compared to the desulfurization activity of the starting materials.The X-ray diffraction (XRD) analysis shows that the reactive species in the adsorbent were complex compound containing calcium silicate hydrate or calcium aluminum silicate hydrate.The adsorbent prepared from OPA/CaSO_4/CaO or Ca(OH)_2 was also found to composed of porous structure contributing to its high BET surface area.
机译：油棕等硅质材料可以用作水合工艺烟气脱硫的活性吸附剂，此类吸附剂的Brunauer-Emmet-Teller（BET）表面积在很大程度上取决于吸附剂的制备变量。本研究对四个吸附剂制备变量的影响：水合时间（x_1），OPA与CaO / Ca（OH）_2（x_2）的比例，CaSO_4（x_3）和CaO或Ca（OH）_2（x_4）的量用2〜4全因子中心复合设计（CCD）在响应表面方法（RSM）中研究了BET吸附剂的吸附表面积，发现除CaSO_4（x_3）的量外，所有吸附剂制备变量均具有显着影响较高的水合时间（x_1 = 30 h）和OPA与CaO / Ca（OH）_2的比例（x_2 = 3：1）对BET表面积有积极作用。用OH）_2代替CaO作为起始原料生产的吸附剂具有较高的表面积。 h以Ca（OH）_2为起始原料制备的最大表面积为134.2 m〜2 / g，活性测试表明，以CaO / Ca（OH）_2 / CaSO_4水合OPA制备的吸附剂的脱硫活性更高。 X射线衍射（XRD）分析表明，吸附剂中的反应性物质为含有水合硅酸钙或水合硅酸铝钙的复合物，由OPA / CaSO_4 / CaO或还发现Ca（OH）_2由多孔结构组成，有助于其高BET表面积。

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