【摘要】：對商用HZSM-5分子篩采用高溫熱處理、水蒸氣處理及堿處理改性,制備了具有介孔結構的改性HZSM-5分子篩。采用X射線衍射、等離子體元素分析、掃描電鏡、N2吸附-脫附、氨-程序升溫脫附等方法對改性前后的分子篩進行表征,考察了高溫熱處理、水蒸氣處理和堿處理3種改性方法對HZSM-5分子篩孔結構、酸性的影響,并考察了改性催化劑乙醇脫水制乙烯催化性能。結果表明,3種改性方法在保持HZSM-5分子篩微孔結構的同時,都形成了一定量的介孔,制備了不同方法的改性HZSM-5分子篩。高溫熱處理、水蒸氣處理及堿處理3種改性方法發(fā)生了不同程度的骨架脫Al和脫Si,影響了分子篩表面酸量及酸強度,尤其是強酸量。分子篩孔結構以及表面酸性質的調變提高了HZSM-5分子篩的催化穩(wěn)定性。
[Abstract]:Modified HZSM-5 molecular sieve with mesoporous structure was prepared by high temperature heat treatment, steam treatment and alkali treatment. The molecular sieve was characterized by X-ray diffraction, plasma elemental analysis, N _ 2 adsorption and desorption under scanning electron microscope, ammonia and temperature programmed desorption. The high temperature heat treatment was investigated. The effects of steam treatment and alkali treatment on pore structure and acidity of HZSM-5 molecular sieve were investigated. The catalytic performance of the modified catalyst for dehydration of ethanol to ethylene was investigated. The results show that the three modification methods have formed a certain amount of mesoporous while maintaining the micropore structure of HZSM-5 molecular sieve, and the modified HZSM-5 molecular sieve has been prepared by different methods. Three modification methods, such as high temperature heat treatment, steam treatment and alkali treatment, took place different degrees of deAl and desification of framework, which affected the amount of acid on the surface of molecular sieve and its strength, especially the amount of strong acid. The catalytic stability of HZSM-5 molecular sieve was improved by the modification of pore structure and surface acid properties.
【作者單位】： 太原理工大學化學化工學院;中國科學院山西煤炭化學研究所;
【基金】：山西省自然科學基金項目(2014011012-3)資助
【分類號】：O643.36

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