scholarly journals Carbon Dioxide Reduction with Hydrogen on Fe, Co Supported Alumina and Carbon Catalysts under Supercritical Conditions

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2883
Author(s):  
Viktor I. Bogdan ◽  
Aleksey E. Koklin ◽  
Alexander L. Kustov ◽  
Yana A. Pokusaeva ◽  
Tatiana V. Bogdan ◽  
...  
Keyword(s):  
Gas Phase Reactions ◽  
Supercritical Conditions ◽  
Co Catalysts ◽  
Reverse Water Gas Shift ◽  
Methanol Formation ◽  
Order Of Magnitude ◽  
Space Time Yield ◽  
Carbon Catalysts ◽  
Shift Reaction ◽  
Reduction Of Co2

Reduction of CO2 with hydrogen into CO was studied for the first time on alumina-supported Co and Fe catalysts under supercritical conditions with the goal to produce either CO or CH4 as the target products. The extremely high selectivity towards methanation close to 100% was found for the Co/Al2O3 catalyst, whereas the Fe/Al2O3 system demonstrates a predominance of hydrogenation to CO with noticeable formation of ethane (up to 15%). The space–time yield can be increased by an order of magnitude by using the supercritical conditions as compared to the gas-phase reactions. Differences in the crystallographic phase features of Fe-containing catalysts cause the reverse water gas shift reaction to form carbon monoxide, whereas the reduced iron phases initiate the Fischer–Tropsch reaction to produce a mixture of hydrocarbons. Direct methanation occurs selectively on Co catalysts. No methanol formation was observed on the studied Fe- and Co-containing catalysts.

Reduction of CO2 to CO via reverse water-gas shift reaction over CeO2 catalyst

2017 ◽  
Vol 35 (2) ◽  
pp. 421-427 ◽  
Author(s):  
Bican Dai ◽  
Shiquan Cao ◽  
Hongmei Xie ◽  
Guilin Zhou ◽  
Shengming Chen
Keyword(s):  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Reverse Water Gas Shift ◽  
Shift Reaction ◽  
Reduction Of Co2 ◽  
Water Gas

scholarly journals In Situ Conditioning of CO2-Rich Syngas during the Synthesis of Methanol

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 534
Author(s):  
Cristina Peinado ◽  
Dalia Liuzzi ◽  
Alberto Sanchís ◽  
Laura Pascual ◽  
Miguel A. Peña ◽  
...  
Keyword(s):  
Catalyst Deactivation ◽  
Water Gas Shift ◽  
Reaction Conditions ◽  
Reverse Water Gas Shift ◽  
Methanol Formation ◽  
Pre Treatment ◽  
Synthesis Of Methanol ◽  
Shift Reaction ◽  
Water Gas

The synthesis of methanol from biomass-derived syngas can be challenging because of the high CO2 content in the bio-syngas, resulting in lower kinetics and higher catalyst deactivation. This work explores the in situ pre-treatment of a CO2-rich syngas with a CO2/CO ratio equal to 1.9 through the reverse-water gas shift reaction with the aim of adjusting this ratio to a more favorable one for the synthesis of methanol with Cu-based catalysts. Both reactions take place in two catalytic beds placed in the same reactor, thus intensifying the methanol process. The water produced during syngas conditioning is removed by means of a sorbent zeolite to prevent the methanol catalyst deactivation and to shift the equilibrium towards the methanol formation. The combination of the CO2 shifting and the water sorption strategies lead to higher productivities of the catalytic bed and, under certain reaction conditions, to higher methanol productions.

Boosting reverse water-gas shift reaction activity of Pt nanoparticles through light doping of W

2021 ◽  
Author(s):  
Daiya Kobayashi ◽  
Hirokazu Kobayashi ◽  
Kohei Kusada ◽  
Tomokazu Yamamoto ◽  
Takaaki Toriyama ◽  
...  
Keyword(s):  
Pt Nanoparticles ◽  
Water Gas Shift ◽  
Solid Solution Alloy ◽  
Alloy Nanoparticles ◽  
Water Gas Shift Reaction ◽  
Reverse Water Gas Shift ◽  
Rwgs Reaction ◽  
Shift Reaction ◽  
Water Gas ◽  
First Time

We report PtW solid-solution alloy nanoparticles (NPs) as a reverse water-gas shift (RWGS) reaction catalyst for the first time. Atomic-level alloying of Pt and W significantly enhanced the RWGS reaction activity of Pt NPs.

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