Abstract
In this study, phosphoric acid (PA), tributylphosphine (TBP) and phenylphosphonic acid (PPA) were chosen as the P sources to modify MCM-22 through incipient impregnation followed by calcination. The acidity, Al distribution and structure of modified samples were characterized by XRD, N2 physical adsorption, NH3-TPD, 31P MAS NMR, 27Al MAS NMR and XPS. Their catalytic performance upon cracking of n-hexane was also examined. The experimental results demonstrated that all the phosphorus modified samples showed a better catalytic life than that of the parent MCM-22, which can be attributed to acidity reduction and changes in Al distribution. However, the destruction of structure during modification will make the extension of lifetime insignificant. Among all the P sources, TBP/MCM-22, with the lowest acid and the smallest amount of Al content in the T2 sites but the least destruction of zeolite structure, exhibited the best stability and over 70% conversion with time on stream of 35 h.
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SB: investigation, formal analysis, data curation, writing, revision. MG: investigation, formal analysis, data curation, writing. BL: writing—review and editing, data curation, methodology. BF: data curation. BJ: supervision, project administration. HZ: conceptualization, resources, data curation, writing—review and editing, project administration, funding acquisition.
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Bao, S., Guo, M., Liu, B. et al. Effect of P sources on the phosphorus modified MCM-22 for n-hexane catalytic cracking. Reac Kinet Mech Cat 132, 431–447 (2021). https://doi.org/10.1007/s11144-020-01903-8
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DOI: https://doi.org/10.1007/s11144-020-01903-8