The conversion of model waste plastic mixture into high-value liquid product was studied in the presence of hydrogen and composites of zeolite beta catalysts. For the sake of comparison, the conversion of actual waste plastic mixture and high-density polyethylene was also carried out. The composite zeolite beta catalysts were synthesized using a range of silica-to-alumina ratios, alkali concentrations, and hydrothermal treatment times. SEM, EDX, XRD, N₂-BET, FTIR, and py-FTIR were used for the characterization of the catalysts. The catalytic experiments were conducted in a 500 ml stirred batch reactor at 20 bar initial cold H₂ pressure and the temperature of the reaction was varied between 360 and 400 °C. The two composite catalysts, BC27 and BC48, prepared without alkali pretreatment were found to be the most suitable catalysts. With BC27 and BC48 at 400 °C, 93.0 wt% conversion was obtained with actual plastic mixture and the liquid yield exceeded 68.0 wt%. Experiments with the regenerated catalysts showed their performance comparable to the fresh catalysts.

中文翻译：

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用于将塑料废物催化加氢裂化为液体燃料的复合沸石β催化剂

在氢气和β-沸石催化剂复合物的存在下，研究了模型废塑料混合物向高价值液体产品的转化。为了比较，还进行了实际废塑料混合物和高密度聚乙烯的转化。使用一定范围的二氧化硅与氧化铝比率，碱浓度和水热处理时间合成了复合沸石β催化剂。SEM，EDX，XRD，N ₂ -BET，FTIR和py-FTIR用于表征催化剂。催化实验是在500 ml搅拌式间歇反应器中于20 bar初始冷H _{2下进行的}压力和反应温度在360至400℃之间变化。发现未经碱预处理制备的两种复合催化剂BC27和BC48是最合适的催化剂。在BC27和BC48在400°C的情况下，使用实际的塑料混合物可获得93.0 wt％的转化率，液体收率超过68.0 wt％。再生催化剂的实验表明它们的性能可与新鲜催化剂媲美。