scholarly journals K-Promoted Ni-Based Catalysts for Gas-Phase CO2 Conversion: Catalysts Design and Process Modelling Validation

2021 ◽  
Vol 9 ◽  
Author(s):  
J. Gandara-Loe ◽  
E. Portillo ◽  
J. A. Odriozola ◽  
T. R. Reina ◽  
L. Pastor-Pérez

The exponential growth of greenhouse gas emissions and their associated climate change problems have motivated the development of strategies to reduce CO2 levels via CO2 capture and conversion. Reverse water gas shift (RWGS) reaction has been targeted as a promising pathway to convert CO2 into syngas which is the primary reactive in several reactions to obtain high-value chemicals. Among the different catalysts reported for RWGS, the nickel-based catalyst has been proposed as an alternative to the expensive noble metal catalyst. However, Ni-based catalysts tend to be less active in RWGS reaction conditions due to preference to CO2 methanation reaction and to the sintering and coke formation. Due to this, the aim of this work is to study the effect of the potassium (K) in Ni/CeO2 catalyst seeking the optimal catalyst for low-temperature RWGS reaction. We synthesised Ni-based catalyst with different amounts of K:Ni ratio (0.5:10, 1:10, and 2:10) and fully characterised using different physicochemical techniques where was observed the modification on the surface characteristics as a function of the amount of K. Furthermore, it was observed an improvement in the CO selectivity at a lower temperature as a result of the K-Ni-support interactions but also a decrease on the CO2 conversion. The 1K catalyst presented the best compromise between CO2 conversion, suppression of CO2 methanation and enhancing CO selectivity. Finally, the experimental results were contrasted with the trends obtained from the thermodynamics process modelling observing that the result follows in good agreement with the modelling trends giving evidence of the promising behaviour of the designed catalysts in CO2 high-scale units.

2019 ◽  
Vol 116 (26) ◽  
pp. 12654-12659 ◽  
Author(s):  
Zhenhong He ◽  
Meng Cui ◽  
Qingli Qian ◽  
Jingjing Zhang ◽  
Huizhen Liu ◽  
...  

Synthesis of liquid fuels (C5+hydrocarbons) via CO2hydrogenation is very promising. Hydrogenation of CO2to liquid hydrocarbons usually proceeds through tandem catalysis of reverse water gas shift (RWGS) reaction to produce CO, and subsequent CO hydrogenation to hydrocarbons via Fischer–Tropsch synthesis (FTS). CO2is a thermodynamically stable and chemically inert molecule, and RWGS reaction is endothermic and needs a higher temperature, whereas FTS reaction is exothermic and is thermodynamically favored at a lower temperature. Therefore, the reported technologies have some obvious drawbacks, such as high temperature, low selectivity, and use of complex catalysts. Herein we discovered that a simple Co6/MnOxnanocatalyst could efficiently catalyze CO2hydrogenation. The reaction proceeded at 200 °C, which is much lower than those reported so far. The selectivity of liquid hydrocarbon (C5to C26, mostlyn-paraffin) in total product could reach 53.2 C-mol%, which is among the highest reported to date. Interestingly, CO was hardly detectable during the reaction. The in situ Fourier transform infrared characterization and13CO labeling test confirmed that the reaction was not via CO, accounting for the eminent catalytic results. This report represents significant progress in CO2chemistry and CO2transformation.


2021 ◽  
Author(s):  
Jun-Ichiro Makiura ◽  
Takuma Higo ◽  
Yutaro Kurosawa ◽  
Kota Murakami ◽  
Shuhei Ogo ◽  
...  

Efficient activation of CO2 at low temperature was achieved by reverse water–gas shift via chemical looping (RWGS-CL) by virtue of fast oxygen ion migration in a Cu–In structured oxide, even at lower temperatures.


Author(s):  
Daiya Kobayashi ◽  
Hirokazu Kobayashi ◽  
Kohei Kusada ◽  
Tomokazu Yamamoto ◽  
Takaaki Toriyama ◽  
...  

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.


2004 ◽  
Vol 226 (2) ◽  
pp. 382-392 ◽  
Author(s):  
A GOGUET ◽  
F MEUNIER ◽  
J BREEN ◽  
R BURCH ◽  
M PETCH ◽  
...  

2017 ◽  
Vol 197 ◽  
pp. 325-336 ◽  
Author(s):  
Alberto Roldan ◽  
Nora H. de Leeuw

Fischer–Tropsch (FT) synthesis has been a recursive method to form valuable molecules from syngas. Metal surfaces have been extensively studied as FT catalysts; among them, iron presents several phases under reaction conditions, oxides and carbides, as active sites for the FT and reverse water gas shift reaction. We present CO reduction on an iron sulfide phase with spinel structure, Fe3S4, also considering the pathways where C–O dissociates leaving CHx species on the surface, which may feed longer aliphatic chains via the FT process. We analysed the thermodynamic and kinetic availability of each step leading to O and OH species co-adsorbed on the surface as well as the formation of H2O from the hydrogenation of the alcohol group in the molecule. This detailed analysis led to energy profiles on both active sites of the surface, and we conclude that this Fe3S4 surface is highly selective towards the formation of methanol, in full agreement with experimental results. These findings point out that the C–C bond formation on greigite takes place through a hydroxycarbene FT mechanism.


Author(s):  
Bin Shao ◽  
Guihua Hu ◽  
Khalil A.M. Alkebsi ◽  
Guanghua Ye ◽  
Xiaoqing Lin ◽  
...  

The integration of carbon capture and CO2 utilization could be a promising solution to the crisis of global warming. By integrating the calcium-looping (CaL) and the reverse-water-gas-shift (RWGS) reaction, a...


Nanoscale ◽  
2019 ◽  
Vol 11 (35) ◽  
pp. 16677-16688 ◽  
Author(s):  
Yulian He ◽  
Ke R. Yang ◽  
Ziwei Yu ◽  
Zachary S. Fishman ◽  
Laura A. Achola ◽  
...  

We develop efficient synthetic methods to prepare various MnO2 structures and investigate their structure–property relationships as applied to the reverse Water Gas Shift (rWGS) reaction with a combination of experimental and theoretical tools.


RSC Advances ◽  
2020 ◽  
Vol 10 (17) ◽  
pp. 10285-10296
Author(s):  
Nicky Bogolowski ◽  
Beatriz Sánchez Batalla ◽  
Baekkyoung Shin ◽  
Jean-Francois Drillet

LSCrM, Ni3Sn2 and GDC20 powders show high activity and selectivity for the RWGS reaction.


1997 ◽  
Vol 125 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Toshihiko Osaki ◽  
Norichika Narita ◽  
Tatsuro Horiuchi ◽  
Toyohiko Sugiyama ◽  
Hiroyuki Masuda ◽  
...  

2015 ◽  
Vol 2 (8) ◽  
pp. 741-748 ◽  
Author(s):  
Baowang Lu ◽  
Yiwen Ju ◽  
Takayuki Abe ◽  
Katsuya Kawamoto

Bimetallic oxides could be well distributed on the SBA-15 surface, and exhibited high catalytic perforation for RWGS reaction.


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