Investigation on binary copper-based catalysts used in the ethanol steam reforming process

Abstract

The use of copper-based binary catalysts, Cu/Zr oxides and Cu/Al oxides, has been examined to produce hydrogen from ethanol in the ethanol steam reforming process. The examined catalysts were compared with non-noble bicomponent catalysts consisting of oxides of nickel and cobalt: Ni/Zr Co/Zr, Ni/Al and Co/Al, prepared and tested in the identical way. Catalytic tests were carried out in the fixed-bed reactor in the temperature range 433-873 K for initial molar ratio of ethanol to water equal to 1:3. Ethanol conversion approached near 100%. Catalysts were characterized by XRD, TPR. Cu/Zr oxides . The catalyst showed very good selectivity. It is significant that carbon monoxide appeared only above 600 K and its selectivity has not exceeded 3% in the higher temperature range. No methane has been detected. Hydrogen yield was relatively stable in the temperature range from 513 to 873 K. Similarly, in the presence of Cu/Al oxides neither CO nor CH 4 were found in the products. The correlation between activity of examined catalysts and textural properties was not found.

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

“…2c illustrates the advanced ESR hydrogen production performance of the reported non-noble metal catalysts as far as we know. It confirmed that the ESR hydrogen generation rate of Ni SA/CeO 2 was ∼3 times higher than the best reported ESR performances, e.g., Ni-Cu/BEA@Co/MFI (774 mmol g −1 h −1 ), 32 20Ni/ATP (537 mmol g −1 h −1 ), 33 Ni/ ATP-C600 (486 mmol g −1 h −1 ), 34 17Co/MnO x (213 mmol g −1 h −1 ), 35 10Co-7.1Ce/SEP (157 mmol g −1 h −1 ), 36 10Co/SEP (46 mmol g −1 h −1 ), 36 NiO/ZrO 2 (34 mmol g −1 h −1 ), 37 and Ni/ Al 2 O 3 (32 mmol g −1 h −1 ). 37 Except for the high ESR activity, the ESR hydrogen generation rate of Ni SA/CeO 2 fluctuated from 1650 to 1702 mmol g −1 h −1 , in a 24 h successive test at 500 °C (Fig.…”

The Route from Green H2 Production through Bioethanol Reforming to CO2 Catalytic Conversion: A Review

“…On the other hand, Martinelli et al [44] found that an interesting strategy to promote CO 2 formation instead of CO is the route of noble-metal-based catalyst doping via Na addition. Under selected operating conditions [45], which involved a quite diluted system and low space velocities (which means improved contact times between the catalyst and the reacting stream), at temperatures below 350 • C, the reaction mechanism did not involve carbon monoxide formation over a Cu/Al oxide catalyst.…”