| 摘要 |
It has been found that strongly basic molecular sieves can be used to make stable, relatively selective catalysts for reactions between carbon- and hydrogen-containing species if the strongly basic molecular sieve is combined with a volatile transition metal carbonyl compound. Although the volatile transition metal compound preferably contains initially only a single transition metal atom, clusterification can convert this compound to a compound or ion of the formula HaMb(CO)c (I) where a, b, and c are nubers greater than zero but no more than about 15, 1 to 2 being typical for a and 3 to 4 being typical for b. The polynuclear (i.e. poly-metal atom) compounds of formula (I) are believed to be trapped within "supercages" of the molecular sieve structure. To obtain the strongly basic molecular sieve used as a starting material for making the catalyst, the molecular sieve is treated with an alkali metal azide and the azide is then decomposed. Catalysts of this invention are particularly useful in, for example, methods for making hydrocarbons from CO/H2 mixture at elevated temperatures (e.g. 250 DEG -450 DEG C.) and pressures (e.g. >/=10 bar). Hydrocarbon products rich in low molecular weight alkenes can be obtained in this manner.
|
