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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
