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We have studied the behaviour of the zeotype silicoaluminophosphate SAPO-34 catalyst in the methanol-to-olefin (MTO) process under real working conditions using simultaneous synchrotron powder X-ray diffraction (PXRD) and Raman spectroscopy with online analysis of products by mass spectrometry. Anisotropic changes in the unit-cell dimensions are shown to be related to the build-up of intermediate...
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