| 摘要 |
<p>Alumina having a pore diameter (defined) of 150 to 400 </>rA is prepared by mixing an aqueous solution of sodium aluminate with formaldehyde, preferably aging the mixture (e.g. for 14-18 hours), separating the precipitate, preferably washing (e.g. with deionized water), drying (e.g. at 110 DEG C. for 14-18 hours) and calcining the alumina (e.g. at 650 DEG C. for 4-6 hours). The molar ratio of formaldehyde to sodium aluminate is preferably 1:1 to 5:1 and mixing of the two solutions is preferably rapid with vigorous stirring.</p> |
