| 摘要 |
<p>A bed packing material, e.g. for use as a catalyst precursor, in the form of regular, preferably cyindrical, units having a multiplicity of through passages of small cross section so that the units have a low voidage, GV, a high ratio of the geometric surface area, GSA, to the volume V, of the equivalent cylindrical unit having no passages, and high ratio of GSA to the product of GV and the surface area, A, of the equivalent cylindrical unit having no passages. </p> |
