Abstract Nano-HZSM-5/γ-Al2O3 composite catalysts were prepared by employing mesoporous γ-Al2O3 as supports. Their structures, morphologies and acidity were characterized using powder X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR) analysis, N2 adsorption and desorption measurement, scanning electron microscope and the NH3 temperature-programmed desorption. Nano-HZSM-5 was uniformly dispersed and grown on the surface of γ-Al2O3 carrier. Nano-HZSM-5/γ-Al2O3 also showed a proper acidity with the uniform acid density distribution. The catalytic pyrolysis of waste tires was carried out in a micro-reactor system, and the composition of the product was analyzed on-line by gas chromatography. The selectivity to light olefins of nano-HZSM-5/γ-Al2O3 reached 29.9%, which was higher than that of nano-HZSM-5 zeolites, γ-Al2O3 and the mixture of nano-HZSM-5 and γ-Al2O3 with the same composition as nano-HZSM-5/γ-Al2O3.

中文翻译：

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使用纳米HZSM-5/γ-Al 2 O 3 催化剂催化热解废轮胎生产轻质烯烃

摘要 以介孔γ-Al2O3为载体，制备了纳米HZSM-5/γ-Al2O3复合催化剂。使用粉末 X 射线衍射 (XRD) 分析、傅里叶变换红外光谱 (FTIR) 分析、N2 吸附和解吸测量、扫描电子显微镜和 NH3 程序升温解吸来表征它们的结构、形态和酸度。Nano-HZSM-5均匀分散生长在γ-Al2O3载体表面。Nano-HZSM-5/γ-Al2O3 也表现出适当的酸度，酸密度分布均匀。在微反应器系统中对废轮胎进行催化热解，并通过气相色谱法在线分析产物的成分。纳米HZSM-5/γ-Al2O3对轻烯烃的选择性达到29.9%，高于纳米HZSM-5沸石，