The method includes providing a reactor that comprises at least a first multicellular extruded body oriented with its cells extending in parallel in {TAIL ~ a vertically downward direction} from a first end of the body to {HEAD ~ a second end} 
The method includes providing a reactor that comprises at least a first multicellular extruded body oriented with its cells extending in parallel in { TAIL ~ a vertically downward direction } from a first end of the body to { HEAD ~ a second end }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD