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Surface and bulk investigation of ZSM5 and Al-MCM-41 using synchrotron XPS, XANES, and hexane cracking |
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| Authors: | PA Jalil MS Kariapper M Faiz N Tabet NM Hamdan J Diaz Z Hussain |
| Affiliation: | aChemistry Department, KFUPM, Dhahran 31261, Saudi Arabia bPhysics Department, KFUPM, Dhahran 31261, Saudi Arabia cPhysics Department, American University of Sharjah, UAE dDepartmento de Fisica, Universidad de Oviedo, 33007 Oviedo, Spain eALS, Lawrence Berkeley Lab, Berkeley CA 94720, USA |
| Abstract: | We present a comparative study of ZSM5 and Al-MCM-41 catalysts using spectroscopic and chemical techniques. The analysis of conventional and synchrotron XPS spectra of these catalysts reveals the presence of a topmost surface-related Si peak in addition to the bulk peak. XANES results suggest structural modification upon heating Al-MCM-41 at 500 °C. Depth-resolved XPS data show Al depletion from the surface of Al-MCM-41 in contrast to surface enrichment of Al in ZSM5. These surface modifications could be one of the reasons for the weak acidity of Al-MCM-41 in chemical reactions such as hexane cracking at different temperatures. |
| Keywords: | ZSM5 Al-MCM-41 XANES |
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