【摘要】 对ＺＳＭ－５型高硅沸石进行了锌改性，制备了不同锌含量的Ｚｎ／ＨＺＳＭ－５催化剂。以丙烷为原料，在反应温度４７０～５５０℃，空速１～７ｈ￣（－１）条件下反应，并考察了催化剂的稳定性。结果表明，Ｚｎ／ＨＺＳＭ－５较ＨＺＳＭ－５在原料转化率变化不大的情况下，芳烃选择性有较大提高，液体产物收率明显增加。氨ＴＰＤ和吡啶陡吸附红外光谱表明，Ｚｎ／ＨＺＳＭ－５较ＨＺＳＭ－５总酸量低，Ｌ酸量多，Ｂ酸量少。丙烷在线热重分析表明，Ｚｎ／ＨＺＳＭ－５积炭初速度较ＨＺＳＭ－５低一半，Ｈ＿２化学吸附表明，Ｚｎ／ＨＺＳＭ－５的吸氢量是０．４５ｍｍｏｌＨ２／ｇＺｎ，相当于每ｍｇ锌可吸附２．７１×１０￣（１７）个氢分子。更多还原

【Abstract】 In this paper,different Zn-containing HZSM-5 zeolites were prepared,andused as catalysts for conversion of propane at the following conditions:temperature of 470～550℃,WHSV of 1～7h￣（-1）.The catalytic stability were tested in continuous reaction for 100 husing propane as the feeding gas. It has been shown that the selectivity of aromatics is higheron zn/HZSM-5 than on HZSM-5 at the same conversion level.NH₃-TPD、PY-IR、H₂-chemisorption and in-situ propane reaction TG techniques were used to characterize the cat-alysts. Based the results of characterization and catalytic activity,it has been proposed thatthe large H₂ adsoprption capacity of Zn/HZSM-5 could give higher activity,and the lowerstrong acid site which leads to a decrease in coke deposition,and thus an increase in catalyticstability.更多还原