Whether waste polyethylene terephthalate (PET) can be effectively recycled is one of the main challenges of the current environmental problems. The hydrolysis of dimethyl terephthalate (DMT) to terephthalic acid (TPA) over Nb-modified HZSM-5 zeolite was studied. Nb/HZSM-5 zeolites with different loadings were prepared and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, NH₃-temperature programmed desorption and pyridine adsorption infrared spectroscopy. The effects of different reaction conditions on the conversion of DMT and TPA yield were investigated.

中文翻译：

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Nb改性HZSM-5沸石催化剂上对苯二甲酸二甲酯水解制对苯二甲酸

废旧聚对苯二甲酸乙二醇酯（PET）能否有效回收利用是当前环境问题的主要挑战之一。研究了对苯二甲酸二甲酯（DMT）在Nb改性HZSM-5沸石上水解成对苯二甲酸（TPA）的过程。制备了不同负载量的Nb/HZSM-5分子筛，并通过X射线衍射、X射线光电子能谱、扫描电子显微镜、NH ₃程序升温脱附和吡啶吸附红外光谱对其进行了表征。考察了不同反应条件对DMT转化率和TPA收率的影响。