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HZSM-5 was modified with antimony oxide by solid-state reaction at 773 K to enhance diffusional constraints. Crystalline phases of antimony oxide were not detected at a Sb 2 O 3 loading up to 10.2 wt%. Antimony oxide was found to strongly interact with the hydroxyl groups of the zeolite, i.e., silanol and bridging hydroxyl groups, and with extra-framework aluminum oxide. Only a small...
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