论文部分内容阅读
采用负压沉积沉淀法制备了纳米Au/HZSM-5催化剂前体,研究了深床焙烧和等离子体焙烧两种方法,以及焙烧温度和焙烧气氛对催化剂中纳米金粒径和催化性能的影响,并采用ICP、TEM、XRD、UV-vis、XPS等表征方法对催化剂金粒子进行了物化性能表征,采用合成气羰基化制乙酸甲酯反应表征催化性能。结果表明,不同焙烧方法和不同焙烧温度及气氛对负载型纳米Au/HZSM-5催化剂中金粒径、形貌、物化性质和催化性能有明显影响。其中,以等离子体焙烧方法在500℃氮气气氛下制备的纳米1.86%Au/HZSM-5催化剂中的金粒径最小,为2-5 nm。用于催化合成气羰基化制乙酸甲酯反应,原料中CO的转化率为67%,乙酸甲酯选择性可达78%。
Preparation of nano-Au / HZSM-5 catalyst precursors by vacuum deposition deposition method, two methods of deep bed calcination and plasma calcination, as well as the influence of calcination temperature and calcination atmosphere on the particle size and catalytic performance of nano- The catalytic properties of gold particles were characterized by ICP, TEM, XRD, UV-vis and XPS. Catalytic performance was characterized by carbonylation of syngas to methyl acetate. The results show that different calcination methods, different calcination temperature and atmosphere have significant effect on the gold particle size, morphology, physico-chemical properties and catalytic performance of the supported nano-Au / HZSM-5 catalyst. Among them, the nano-sized 1.86% Au / HZSM-5 catalyst prepared by the plasma calcination method under a nitrogen atmosphere at 500 ° C has the smallest gold particle size of 2-5 nm. Catalytic synthesis of carbonylation of the synthesis of methyl acetate reaction, the conversion of CO in raw materials was 67%, methyl acetate selectivity of up to 78%.