Double bed reactor for the simultaneous steam reforming of ethanol and water gas shift reactions

Batista, Marcelo da Silva; Assaf, Elisabete Moreira; Assaf, José Mansur; Ticianelli, Edson A.

doi:10.1016/j.ijhydene.2005.09.004

Cited by 38 publications

(10 citation statements)

References 15 publications

(17 reference statements)

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“…The TPR of 10% Co-Ce 0.74 Zr 0.26 O 2 (figure 3a) showed a low intensity peak at 310°C and a broader peak at 350°C. The peak obtained at 310 4°C corresponds to the reduction of Co 3 O 4 to CoO, and the peak at 350°C has been attributed to the reduction of CoO to metallic Co [35,36]. The broad peak at 741°C is due to the reduction of bulk CeO 2 .…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Steam reforming of ethanol on Ni–CeO2–ZrO2 catalysts: Effect of doping with copper, cobalt and calcium

Biswas

Kunzru

2007

Catal Lett

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Steam reforming (SR) and oxidative steam reforming (OSR) of ethanol were investigated over undoped and Cu, Co and Ca doped Ni/CeO 2 -ZrO 2 catalyst in the temperature range of 400-650°C. The nickel loading was kept fixed at 30 wt.% and the loading of Cu and Co was varied from 2 to 10 wt% whereas the Ca loading was varied from 5 to 15 wt.%. The catalysts were characterized by various techniques, such as surface area, temperature programmed reduction, X-Ray diffraction and H 2 chemisorption. For Cu and Co doped catalyst, CuO and Co 3 O 4 phases were detected at high loading whereas for Ca doped catalyst, no separate phase of CaO was found. The reducibility and the metal support interactions were different for doped catalysts and varied with the amount and nature of dopants. The hydrogen uptake, nickel dispersion and nickel surface area was reduced with the metal loading and for the Co loaded catalysts the dispersion of Ni and nickel surface area was very low. For Cu and Ca doped catalysts, the activity was increased significantly and the main products were H 2 , CO, CH 4 and CO 2 . However, the Co doped catalysts showed poor activity and a relatively large amount of C 2 H 4 , C 2 H 6 , CH 3 CHO and CH 3 COCH 3 were obtained. For SR, the maximum enhancement in catalytic activity was obtained with in the order of NCu5. For Cu-Ni catalysts, CH 3 CHO decomposition and reforming reaction was faster than ethanol dehydrogenation reaction. Addition of Cu and Ca enhanced the water gas shift (WGS) and acetaldehyde reforming reactions, as a result the selectivity to CO 2 and H 2 were increased and the selectivity to CH 3 CHO was reduced significantly. The maximum hydrogen selectivity was obtained for Catalyst N (93.4%) at 650°C whereas nearly the same selectivity to hydrogen (89%) was obtained for NCa10 catalyst at 550°C. In OSR, the catalytic activity was in the order N > NCu5 > NCa15 > NCo5. In the presence of oxygen, oxidation of ethanol was appreciable together with ethanol dehydrogenation. For SR reaction, the highest hydrogen yield was obtained on the undoped catalyst at 600°C. However, with calcium doping the hydrogen yields are higher than the undoped catalyst in the temperature range of 400-550°C.

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Section: Catalyst Characterizationmentioning

confidence: 99%

Steam reforming of ethanol on Ni–CeO2–ZrO2 catalysts: Effect of doping with copper, cobalt and calcium

Biswas

Kunzru

2007

Catal Lett

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“…The concentrations of the generated H 2 and CO after 210 min of time‐on‐stream were about 68.7 % and 6.2 %, respectively. Based on the obtained results, methane generation was one of the major processes occurring by the methanation of carbon oxides and the decomposition of ethanol .…”

Section: Resultsmentioning

confidence: 95%

“…Batista et al studied simultaneous ESR and WGS reaction with Co/SiO 2 and Fe 2 O 3 catalysts at 400 °C. The results showed that the reduction in the CO level was almost 80 % compared to conventional ESR.…”

Section: Introductionmentioning

confidence: 99%

Ethanol Steam Reforming Followed by Water‐Gas Shift Reaction over Ce‐Ni/MCM‐41 and Fe‐Based Catalysts

Rahmanzadeh

Taghizadeh

2019

Chem Eng & Technol

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Current research focuses on hydrogen production from ethanol steam reforming (ESR) followed by water-gas shift (WGS) reaction. Ce-Ni/MCM-41 and Fe/Ce/M (where M = K, La, Ti) catalysts were prepared by the wet-impregnation technique and used for the ESR and WGS reactions, respectively. All experiments were carried out at 600°C. The effects of the reduction time, the ratio of the two catalysts, and their arrangement were also investigated. The best results were obtained using Fe/Ce/Ti as WGS catalyst and with a separate array because the H 2 production and CO 2 level in the product gas were improved while that of CO was reduced. To generate high-purity hydrogen, the CaO-based adsorbent was used as a third layer to adsorb CO 2 from the gaseous products.

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“…For example, dehydrogenation of acetaldehyde is favored with respect to ethylene dehydration employing a double-bed catalytic configuration with a first bed of a Cu-containing catalyst operating at low temperatures (e.g., 300-400 °C). The intermediate acetaldehyde species is subsequently passed through a second bed containing a reforming catalysts (e.g., Ni-based material) operating at higher temperatures [8]. In this way, subsequent polymerization of organic species to carbonaceous deposits (coke) is minimized.…”

Section: Ethanolmentioning

confidence: 99%

Continuous-Flow Processes in Heterogeneously Catalyzed Transformations of Biomass Derivatives into Fuels and Chemicals

et al. 2012

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Continuous flow chemical processes offer several advantages as compared to batch chemistries. These are particularly relevant in the case of heterogeneously catalyzed transformations of biomass-derived platform molecules into valuable chemicals and fuels. This work is aimed to provide an overview of key continuous flow processes developed to date dealing with a series of transformations of platform chemicals including alcohols, furanics, organic acids and polyols using a wide range of heterogeneous catalysts based on supported metals, solid acids and bifunctional (metal + acidic) materials

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Double bed reactor for the simultaneous steam reforming of ethanol and water gas shift reactions

Cited by 38 publications

References 15 publications

Steam reforming of ethanol on Ni–CeO2–ZrO2 catalysts: Effect of doping with copper, cobalt and calcium

Steam reforming of ethanol on Ni–CeO2–ZrO2 catalysts: Effect of doping with copper, cobalt and calcium

Ethanol Steam Reforming Followed by Water‐Gas Shift Reaction over Ce‐Ni/MCM‐41 and Fe‐Based Catalysts

Continuous-Flow Processes in Heterogeneously Catalyzed Transformations of Biomass Derivatives into Fuels and Chemicals

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