| 摘要 |
PURPOSE:To produce formaldehyde in high methanol conversion ratio and in high selectivity for formaldehyde with a small amount of by-products, by dehydrogenating methanol in a gaseous phase by the use of a catalyst consisting of copper, phosphorus and silica gel. CONSTITUTION:A catalyst which consists of copper, phosphorus and silica gel in an atomic ratio of copper/phosphorus of preferably 10/0.1-10/10 and previously calcined at 200-550 deg.C, preferably 250-500 deg.C before dehydragenation reaction is carried out is used and dehydrogenation reaction of methanol is carried out in a gaseous phase at about 400-700 deg.C to give formaldehyde. In preparing the catalyst, before copper and phosphorus are supported, they are heat-treated at 500-1,000 deg.C, preferably 700-900 deg.C to improve reaction activity and selectivity for formaldehyde effectively. The catalyst neither uses a large amount of expensive catalyst nor requires oxygen so no water is produced as by-product. |
