| Budget Amount *help |
¥33,300,000 (Direct Cost: ¥33,300,000)
Fiscal Year 1985: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1984: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1983: ¥26,800,000 (Direct Cost: ¥26,800,000)
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| Research Abstract |
Establishing a technology by which various carbon resources are converted through synthesis gas into fuel or chemical feedstocks and thus securing stable supply of energy is of paramount importance to our country. The present work is focused on the production of <C_2> - <C_5> alcohols mixture from synthesis gas. Alcohols mixture is attractive not only as a high-calory fuel but also as a chemical feedstock, since it is easily converted to important olefines by dehydration. While rhodium (Rh) is known as a promising catalyst for synthesis gas conversion to the oxygenates, its resource scarcity led us to utilize a metal other than Rh, namely rhenium (Re), which has been gaining attention recently. The work aims at accumulating the basic knowledge on how to increase the catalyst's activity for the alcohols mixture production. Summary of the project results follow.
1. Support Effects: CO hydrogenation activities of Re-containing catalysts are strongly influenced by the kind of support used. Examination of 12 support materials found that the catalytic activity is increased when Re is supported on iron oxide, titania or zirconia, whereas alcohols selectivity was increased with iron oxide support.
2. Pretreatment Conditions: The best pretreatment conditions for the production of alcohols were found to be the reduction by hydrogen at 300゜C.
3. Surface Adosorbed Species: Analysis using ESR, XPS, FT-IR, GC-MS and other techniques found that under reaction conditions the surface rhenium is reduced to O valency, and that CO is adsorbed in the form of rhenium tricarbonyl.
4. Optimization of Catalyst Preparation Materials: Based on the above results, Various rhenium carbonyls were used as a starting material for the rhenium component, which increased the selectivity of alcohols.
5. Surface Treatment of Catalysts by Supercritical Gas: Treating the spent catalyst surfaces by supercritical toluene greatly suppressed the production of undesired carbon dioxide.
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