Ecole Nationale d'Ingénieurs de Monastir, Avenue Ibn EL Jazzar, 5019 Monastir, Tunisia; Ecole des Mines de Nantes, GEPEA UMR 6144, CNRS, 4 Rue Alfred Kastler, 44307 Nantes, France; Unité de Recherche en Science et Technologies de l'Environnement, Institut Supérieur des Sciences et Technologies de l'Environnement de Borj Cédria, Hammam Lif, Tunisia.
Unité de Recherche en Science et Technologies de l'Environnement, Institut Supérieur des Sciences et Technologies de l'Environnement de Borj Cédria, Hammam Lif, Tunisia.
Waste Manag. 2017 Sep;67:288-297. doi: 10.1016/j.wasman.2017.06.001. Epub 2017 Jun 7.
The treatment and disposal of tyres from vehicles has long been of considerable environmental importance. Studies have been undertaken to reduce their environmental impact. In this study, an alternative gas was produced from automobile tyre wastes by the means of a controlled pyrolysis. To do so, a novel catalytic system was designed with the aim of increasing the rate of conversion and improving the quality of the pyrolysis products. This work aimed also to reduce the severity of the overall reactions, by using powder catalysts (MgO, AlO, CaCO, and zeolite ZSM-5) uniformly distributed on two layers of oyster shells (OS) particles. The catalyst/tyres mass ratio was kept for all the tests at 1/30. The pyrolysis reactor was maintained at 500°C and the influence of each catalyst and of the number of shell beds (0, 1 or 2), on the yield and composition of the derived products, was examined. The gas yields could contribute by 1.2% of total consumption in Tunisia. Furthermore, some combinations could upgrade the derived gas and made it possible to use it as such or with the minimum of post-treatment. It was found that, with the use of supported catalyst, the gas produced is 45% greater compared to classical thermal pyrolysis. The Heating value of the produced gas was also improved by the use of supported catalysts; it was found 16% greater with the use of AlO/OS compared to non-catalytic pyrolysis. When compared to the gas obtained from only one catalytic supported bed, the sulfur content was reduced by 80% with the use of CaCO/OS on two catalytic beds.
长期以来，车辆轮胎的处理和处置一直是一个非常重要的环境问题。已经进行了一些研究来减少其对环境的影响。在这项研究中，通过控制热解，从汽车轮胎废物中产生了一种替代气体。为此，设计了一种新型催化体系，旨在提高转化率并改善热解产物的质量。这项工作还旨在通过使用均匀分布在两层牡蛎壳（OS）颗粒上的粉末催化剂（MgO、AlO、CaCO 和沸石 ZSM-5）来降低整体反应的剧烈程度。所有测试中，催化剂/轮胎的质量比保持在 1/30。热解反应器保持在 500°C，考察了每种催化剂和贝壳床数量（0、1 或 2）对衍生产物产率和组成的影响。气体产率可占突尼斯总消耗量的 1.2%。此外，一些组合可以升级衍生气体，并使其可以直接使用或只需进行最低限度的后处理。结果发现，与使用传统热解相比，使用负载型催化剂可使产生的气体增加 45%。使用负载型催化剂还可以提高产生气体的热值；与非催化热解相比，使用 AlO/OS 时，发现其热值提高了 16%。与仅使用一个催化支撑床获得的气体相比，当在两个催化床上使用 CaCO/OS 时，硫含量降低了 80%。
