CAJ | 학술논문

分别用ZnSO4, Zn(AcO)2, Zn(NO3)2和ZnCl2溶液对HZSM-5分子筛浸渍改性得到不同Zn盐改性的HZSM-5催化剂。采用X射线衍射、N2物理吸附、热重-质谱分析、氨程序升温脱附和吡啶吸附红外光谱等方法对改性后的催化剂进行了表征,并在固定床反应装置上考察了其甲醇芳构化反应性能。结果表明,不同Zn盐改性的HZSM-5催化剂上Zn物种的存在形式不同会导致其表面酸中心强度与分布具有较大差异,经ZnSO4改性的HZSM-5催化剂表面上强B酸中心和Zn物种的存在使其表现出最佳的甲醇芳构化反应性能。
분별용ZnSO4, Zn(AcO)2, Zn(NO3)2화ZnCl2용액대HZSM-5분자사침지개성득도불동Zn염개성적HZSM-5최화제。채용X사선연사、N2물리흡부、열중-질보분석、안정서승온탈부화필정흡부홍외광보등방법대개성후적최화제진행료표정,병재고정상반응장치상고찰료기갑순방구화반응성능。결과표명,불동Zn염개성적HZSM-5최화제상Zn물충적존재형식불동회도치기표면산중심강도여분포구유교대차이,경ZnSO4개성적HZSM-5최화제표면상강B산중심화Zn물충적존재사기표현출최가적갑순방구화반응성능。
HZSM-5 catalysts modified with various Zn salts, namely zinc sulfate, zinc acetate, zinc nitrate, and zinc chloride, were prepared using an impregnation method. The resultant catalysts were charac-terized by X-ray diffraction, N2 adsorption, thermogravimetry-mass spectrometry, tempera-ture-programmed desorption of NH3, and infrared spectroscopy using pyridine as the probe mole-cule. The methanol-to-aromatic (MTA) performance over the modified catalysts was investigated. The results showed that the type of Zn species in the catalyst significantly influenced the catalyst surface acidity. The distribution of acid sites and Zn species in the HZSM-5 catalyst modified with zinc sulfate effectively improved the MTA performance.