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