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首页> 外文期刊>Journal of Analytical & Applied Pyrolysis >Effects of phosphoric acid as additive in the preparation of activated carbon fibers from poly(p-phenylene benzobisoxazole) by carbon dioxide activation
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Effects of phosphoric acid as additive in the preparation of activated carbon fibers from poly(p-phenylene benzobisoxazole) by carbon dioxide activation

机译：磷酸作为添加剂对二氧化碳活化聚对苯撑苯并二恶唑制备活性炭纤维的影响

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摘要

Poly(p-phenylene benzobisoxazole) (PBO) was impregnated with small amounts of H_3PO_4, and the effects of this additive on the porosity and other characteristics of chars and activated carbon fibers (ACFs) derived from this polymer were investigated. To this end, PBO-AS impregnated with 5, 10 or 15 wt.% H_3PO_4 was pyrolyzed at 850 ℃, and the resulting chars were physically activated with carbon dioxide at 800℃ to different burn-off (BO) degrees. Thermal analysis techniques only detected minor effects of H_3PO_4 on PBO pyrolysis. The char yield and char reactivity towards CO_2 increased following PBO-AS impregnation with H_3PO_4. Structural (X-ray diffraction), porous textural (CO_2 adsorption) and surface chemical (temperature-programmed desorption, X-ray photoelectron spectroscopy) characterizations of the pyrolysis chars indicated that the increase in char reactivity is probably associated with a higher content of oxygenated functionalities. Following CO_2 activation, the surface area and pore volume of the obtained ACFs chiefly depended on the BO degree, but impregnation with H_3PO_4 restricted the pore size to the micropore and narrow mesopore range, thus producing adsorbents with a slightly narrower pore size distribution than in the absence of H_3PO_4. The results are compared with those previously obtained under equivalent conditions with other high-crystallinity polymers as precursors for ACFs.
机译：用少量的H_3PO_4浸渍聚对苯撑苯并二恶唑（PBO），并研究该添加剂对由该聚合物衍生的炭和活性炭纤维（ACF）的孔隙率和其他特性的影响。为此，将浸渍有5、10或15 wt。％H_3PO_4的PBO-AS在850℃下热解，并将所得的炭在800℃下用二氧化碳物理活化至不同的燃尽（BO）度。热分析技术仅检测到H_3PO_4对PBO热解的微小影响。用H_3PO_4浸渍PBO-AS后，焦炭收率和对CO_2的炭反应性增加。热解炭的结构（X射线衍射），多孔质构（CO_2吸附）和表面化学（程序升温脱附，X射线光电子能谱）表征表明，炭反应性的增加可能与更高的含氧量有关功能。 CO_2活化后，所获得的ACF的表面积和孔体积主要取决于BO的程度，但是H_3PO_4的浸渍将孔径限制在微孔和狭窄的中孔范围内，因此产生的吸附剂的孔径分布比吸附剂中的要窄。没有H_3PO_4。将结果与先前在等效条件下使用其他高结晶度聚合物作为ACF的前体获得的结果进行比较。

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