| abstract |
A method for producing a three-dimensional porous transition alumina catalyst monolith of stacked catalyst fibers, comprising the following steps: na) Preparing a suspension paste in a liquid diluent of transition alumina particles, hydroxide precursor particles or oxyhydroxide precursor particles or mixtures thereof and which suspension can furthermore comprise a binder material and/or a plasticizer and/or a dopant, all particles in the suspension having a number average particle size in the range of from 0.5 to 500 µm, nb) extruding the paste of step a) through one or more nozzles to form fibers, and depositing the extruded fibers to form a three-dimensional porous catalyst monolith precursor, nc) drying the porous catalyst monolith precursor to remove the liquid diluent, nd) performing a temperature treatment of the dried porous catalyst monolith precursor of step c) at a temperature in the range of from 500 to 1000 °C, to form the transition alumina catalyst monolith, nwherein no temperature treatment of the porous catalyst monolith precursor or porous catalyst monolith at temperatures above 1000 °C is performed and wherein no further catalytically active metals, metal oxides or metal compounds are applied to the surface of the catalyst monolith precursor or transition alumina catalyst monolith, and wherein preferably no further catalytically active metals, metal oxides or metal compounds are present in the suspension paste. |