Dehydration and dehydrogenation of 2-octanol by thorium oxide

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Abstract

The selectivity of 2-octanol reaction by dehydration to octenes vs. dehydrogenation to 2-octanone has been determined for thorium oxide prepared by well-defined and reproducible procedures. The selectivity was very dependent on the catalyst pretreatment. In general, thoria pretreated at 600 °C with hydrogen was a dehydration catalyst while thoria pretreated at 600 °C with oxygen was a more effective catalyst for dehydrogenation. While the pretreatment was the major factor for determining selectivity, the thoria preparative procedure also played a role. The selectivity for 1-octene formation as compared to 2-octene production was also dependent on the pretreatment and on the thoria preparation procedure. Certain thoria preparations were found to be extremely selective for 1-octene formation while others were not very selective. Over some thoria preparations, a large amount of n-octane was formed at an early time on stream.

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