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Influence of nickel during the thermal degradation of pine cone shell. Study of the environmental implications

机译:镍对松锥壳热降解的影响。研究环境影响

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Thermal valorization of heavy metal impregnated biomass has grown up as a researching field during the last few years; however the use of these contaminated wastes as fuel still presents several economic and technical drawbacks. Specially, insertion of nickel metal into the biomass during an impregnation stage with aqueous solutions of nickel salts, promotes wide dispersion of the precursor inside the lignocellulosic matrix and impacts on good results with respect to the reduction of tars. Therefore, the catalytic effect of the nickel during the thermal decomposition of an impregnated pine cone shell is investigated in this work. The effects of the heating rate and the atmosphere on the thermal decomposition of the natural solid show that an increase in heating rate produces a shifting of the curves at higher temperatures without significant change of its shape. Three distinct stages of mass loss are presented during degradation process for the different reaction atmospheres; however, the temperature ranges in which the stages are performed are different. Moreover, an increase in the thermal stability of nickel-loaded pine cone shell in the early stages is observed. The results obtained by mean method of Coasts Redfern show that the function that could represent the thermal degradation mechanism associated with the major step of degradation of the pine cone shell is the reaction of nth order, being the third, fourth or fifth order the most regular order. About the environmental implications, the residual waste is lower for nickel-loaded biomass. Moreover, the nickel remains mainly in the ashes, therefore, the nickel content in these ashes may be recovered, or ashes distribute to any subsequent application. (C) 2018 Elsevier Ltd. All rights reserved.
机译:在过去的几年中,重金属浸渍生物质的热增值成为一个研究领域。然而,将这些被污染的废物用作燃料仍然存在一些经济和技术上的缺陷。特别地,在含镍盐水溶液的浸渍阶段将镍金属插入生物质中,可促进前体在木质纤维素基质内的广泛分散,并影响减少焦油的良好结果。因此,在这项工作中研究了镍在浸渍松锥壳热分解过程中的催化作用。加热速率和气氛对天然固体热分解的影响表明,加热速率的增加会导致在较高温度下曲线发生位移,而形状没有明显变化。对于不同的反应气氛,在降解过程中呈现出质量损失的三个不同阶段。但是,进行各阶段的温度范围不同。而且,在早期阶段,观察到镍负载的松锥壳的热稳定性增加。通过Coasts Redfern平均方法获得的结果表明,可以表示与松果壳降解主要步骤相关的热降解机理的函数是n阶反应,其中第三,第四或第五阶是最规则的反应。订购。关于环境方面的问题,镍负载生物质的残留废物较少。此外,镍主要残留在灰烬中,因此,这些灰烬中的镍含量可以回收,或者灰烬分布到任何后续应用中。 (C)2018 Elsevier Ltd.保留所有权利。

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