Similar conditions were applied to study the steam reforming of methanol in a fixed bed tubular reactor by utilizing a 3-channel set-up. The set-up ensured that all the three catalysts could be investigated concurrently. An efficient heat transfer in the reactor was further achieved by placing aluminium on a heating block. The temperature of the reactor was repeatedly regulated by PID control of the cartridge heaters located on the interior of the aluminium block. Moreover, time on stream investigations were performed at 523 K and the mass of the catalyst varied between 0.100 and 0.770 g, depending on the Cu content, in order to keep the amount of CuO constant for all samples (0.0225 g).
Other measurement such kinetic analysis entailed increasing the mass of the catalyst by a certain factor such as 2.7 which corresponded to a CuO content of 0.0584 g for each sample, to achieve full conversion in the temperature range investigated (503-573 K). A stainless steel grid was used to support the catalyst inside the reactor. For flow conditioning, inert Pyrex beads (d = 500 mm) were placed below and on top of the catalyst bed. The reactant mixture of MeOH (HPLC grade, 99.9% purity) and distilled water, with a molar ratio MeOH/H2O = 1:1, was introduced into the reactor by means of a Dionex HPLC P 580 pump. All the reactants were completely degassed before use at 20kPa. The instruments were assembled such that the time-on-stream measurements had a flow rate for a single channel at 0.07 cm3min-1, whereas for kinetic investigations, it was varied between 3.33Ã—10-3Â and 0.67 cm3min-1
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