Abstract
Real-time X-ray absorption spectra (XAS) during the course of temperature-programmed reduction (TPR) were recorded to investigate the reducibility of cobalt on aluminophosphate molecular sieve AlPO-5. When incorporated into the AlPO-5 framework via hydrothermal synthesis, cobalt exhibited high resistance to reduction by hydrogen. In contrast, cobalt could be fully reduced in the temperature range between 400 and 500 °C when supported on the surface of AlPO-5. The coordination number (NCo–Co) for the first shell was 8.5 on the reduced catalyst with a cobalt loading of ∼5 wt.%, corresponding to an average particle size of 35 Å.
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