This system contains an EtOH gasification unit, a gas flow distributor, an electric furnace holding 10 quartz reaction tubes with catalyst beds, an auto-sampler in tandem with a quadrupole mass spectrometer (QMS, Transpector CPM 3, Inficon), and an exhaust system. All the lines in the HTE system are appropriately heated to prevent any condensation of the reactants and products. The EtOH gasification unit consists of a liquid mass flow controller (LMFC), a degasser, and a vaporizer that generates gasified EtOH under an argon (Ar) stream. The gas flow distributor affixed into a heating block then equally distributes the EtOH/Ar mixture into ten reaction tubes, which are fabricated by fusing two quartz tubes of inner diameters of 4 mm and 2 mm. As described in our previous work, this design allows us to minimize the gas phase reactions on the effluent side and maintains the inertness of the reactor walls at higher temperatures. The catalyst bed of suitable height is affixed at the neck of the reaction tube using quartz wool. An electric furnace with three heating zones encompasses the reaction tubes ensuring uniform heating along the tubes. The effluent is then channeled into the sampling line of the autosampler, which is connected to a diaphragm pump and inlet of the QMS. The automation of sampling is achieved by means of programmed pneumatically actuated diaphragm valves (MEGA-ONE, Fujikin). During the sampling, the effluent continuously flows into the QMS, and mass spectra are recorded for the pre-set mass fragments. The measured intensities of the fragments are converted to relative pressures of individual gases using a scale factor obtained from external calibration. The unsampled fraction of the effluent is discharged through the exhaust system. Complete automation of the catalyst evaluation was achieved in the HTE system by programming the gas flow, reactor temperature, and auto-sampling of the effluents. The uniformity of gas flow across all the ten channels was validated and is presented in Figure .