The waste plastic gasification in a fluidized bed for a continuous carbon nanotube (CNT) and hydrogen coproduction is a potential method for sustainable management. Ni/Al₂O₃ catalysts have been synthesized by the impregnation method to upgrade hydrogen production and CNT synthesis. However, few studies investigated the effect of operating parameters for upcycling waste plastics into CNTs and hydrogen in the fluidized-bed system. The reaction temperature and the equivalence ratio (ER) were evaluated for CNT and hydrogen coproduction. Increasing the reaction temperature and lowering the ER enhanced the methane dry reforming, hydrocarbon dry reforming, and hydrocarbon direct decomposition for hydrogen and CNT coproduction. While increasing the reaction temperature from 500 to 700 °C can obtain higher CNT yield and H₂ production rate, the system heated to 700 °C and maintained at this temperature should provide more energy. Moreover, the gas composition at 600 °C with 0.1 ER contained more CH₄ and C₂–C₅ hydrocarbons compared with that with a higher ER, which could be used as the carbon source of CNTs. The reaction temperature of the fluidized bed in the waste plastic gasification system controlled at 600 °C with 0.1 ER and the gasified products upgraded through a catalytic fixed-bed reactor at 680 °C exhibited an optimal catalytic performance of less-defective CNTs in 22.0% yield and H₂ production rate (385.1 mmol/h-g catalyst).

中文翻译：

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温度和当量比对流化床废塑料气化过程中碳纳米管和产氢的影响

在流化床中用于连续碳纳米管（CNT）和氢联产的废塑料气化是可持续管理的潜在方法。Ni / Al ₂ O ₃已经通过浸渍方法合成了催化剂，以提高制氢和CNT的合成。但是，很少有研究调查操作参数对在流化床系统中将废塑料上载到CNT和氢气中的作用。评价反应温度和当量比（ER）的CNT和氢共产。提高反应温度和降低ER可以提高甲烷干重整，烃干重整和烃直接分解制氢和CNT的联产能力。在将反应温度从500升高到700°C的同时，可以获得更高的CNT产率和H ₂生产率，加热到700°C并保持在该温度下的系统应提供更多的能量。此外，与具有较高ER的气体相比，具有0.1 ER的600°C的气体成分包含更多的CH ₄和C ₂ -C ₅烃，可以用作CNT的碳源。废塑料气化系统中流化床的反应温度控制在600°C，使用0.1 ER，气化产物通过催化固定床反应器在680°C进行升级，其不良性能较好的CNTs的最佳催化性能为22.0％产率和H ₂产生速率（385.1 mmol / hg催化剂）。