E.i. Dupont De Nemours and Company

William R McClellan

Alvin B Stiles

Tom A Bither, Jr

Catalytic vapor phase process wherein the feed stream comprising, on a molar basis, the sum of which is 100%, 10-32% of at least one linear unsaturated C.sub.4 -hydrocarbon selected from 1-butene, 2-butene and 1,3-butadiene, 10-25% oxygen, 3-30% water and 13-77% inert diluent, is contacted with a modified bismuth molybdenum oxide catalyst at 350.degree.-600.degree. C. at a pressure of at least 1 atmosphere (about 100 kPa) for 0.1-10 seconds, said catalyst being selected from:

Preparation of furan

Methanol is converted to formaldehyde in a two step vapor phase process. In the first step the methanol is partially converted to formaldehyde over a silver catalyst, and in the second step the remaining methanol is converted to formaldehyde over a bismuth molybdate- or bismuth phosphomolybdate-on-titania catalyst having the formula:

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Kennett Square, PA, United States of America

William R McClellan