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- Title
HZSM-5分子筛的磷改性及其在加氢蜡油 裂化中的性能研究.
- Authors
王文静; 李新; 郭振莲; 陈春雨; 张凤岐
- Abstract
A series of phosphorus modified HZSM-5 molecular sieves are prepared by impregnation method. X-ray diffraction (XRD), N. physical adsorption, X-ray fluorescence spectrometry, NH, temperature-programmed desorption, and infrared spectra of pyridine adsorption methods are used for its characterization and the different phosphorus content of HZSM-5 molecular sieve structure, acidity and the influence law on hydrogenation wax cracking are examined. The results show that with the increase of phosphorus content, the B acid site decreases, and the pore volume and specific surface area decreases. The selectivity of light olefins increases due to the decrease of strong B acid site which inhibited hydrogen transfer reaction. As the modified HZSM M-5 molecular sieve pore is blocked, its activity decreases significantly with the increase of phosphorus content. Therefore, the yield of propylene presents a trend of first increasing and then decreasing. When phosphorus mass fraction is 5%. propylene yield can be up to 5.9%. It is particularly important to check the appropriate phosphorus content during the development of the productive propylene additive.
- Subjects
HYDROGEN transfer reactions; MOLECULAR sieves; MOLECULAR structure; FLUORESCENCE spectroscopy; X-ray fluorescence
- Publication
Chemical Engineering of Oil & Gas / Shi You Yu Tian Ran Qi Hua Gong, 2021, Vol 50, Issue 3, p66
- ISSN
1007-3426
- Publication type
Article
- DOI
10.3969/j.issn.1007-3426.2021.03.010