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Enhancing catalytic selectivity and stability for CO2 hydrogenation to methanol using a solid-solution catalyst

Enhancing catalytic selectivity and stability for CO2 hydrogenation to methanol using a... Downloaded from https://academic.oup.com/nsr/article/5/5/607/4822168 by DeepDyve user on 12 July 2022 RESEARCH HIGHLIGHTS Chen 607 MATERIALS SCIENCE Enhancing catalytic selectivity and stability for CO hydrogenation to methanol using a solid-solution catalyst 1,2 Jingguang G. Chen are at least two main issues that are poten- prevents one from obtaining conclusive The catalytic hydrogenation of CO with tially hindering the large-scale applica- information regarding the active sites un- renewable H represents a promising tion of this catalyst: (1) the lack of defini- der reaction conditions, therefore mak- pathway for reducing CO emissions. tive understanding of the active sites, and ing it difficult to develop strategies for Among the various hydrogenation prod- (2) the instability of this catalyst at rela- significant enhancement of catalytic per- ucts, the formation of methanol (CO + tively high CO conversions. For exam- formance. 3H → CH OH + H O) is preferred 2 3 2 2 ple, currently there is debate about the A recent paper by Can Li’s group because methanol can be used not only role of ZnO in this catalyst. One possi- [5] has demonstrated the possibility of as a fuel but also as a reactant to produce bility is that there is an intimate synergy significantly improving the catalytic se- olefins and other value-added chemicals between Cu and ZnO at the interface, lectivity and stability at reasonably high [1]. Due to the chemical inertness of where ZnO could act as a structural mod- CO conversions. Using a catalyst con- CO , its catalytic conversion to methanol 2 ifier, hydrogen reservoir or direct pro- sisting of a ZnO–ZrO solid solution, encounters significant challenges, in par- 2 moter for bond activation. The other pos- these authors achieved a methanol selec- ticular in maintaining catalytic selec- sibility is that a highly active ZnCu alloy tivity of 86%–91% at CO conversions tivity and stability at CO conversion 2 levels that are acceptable for industrial forms by partial reduction of ZnO or a greater than 10%. Equally important, this processes. decoration of Cu with metallic Zn. The catalyst remains stable after 500 hours At present the most commonly used inhomogeneous nature of the supported on stream. By using a combination of catalyst is Cu/ZnO/Al O [2–4]. There Cu/ZnO/Al O catalyst in most cases experimental evaluation, spectroscopic 2 3 2 3 Downloaded from https://academic.oup.com/nsr/article/5/5/607/4822168 by DeepDyve user on 12 July 2022 608 Natl Sci Rev, 2018, Vol. 5, No. 5 RESEARCH HIGHLIGHTS characterization and density functional In summary, the work by Can Li’s REFERENCES theory (DFT) calculations, this paper group has identified an alternative, solid- 1. Porosoff MD, Yan BH and Chen JG. Energy Environ also provides convincing evidence re- solution catalyst with promising catalytic Sci 2016; 9: 62–73. garding the origin of the excellent perfor- performance in terms of conversion, se- 2. Behrens M, Studt F and Kasatkin I et al. Science manceoftheZnO–ZrO solid-solution lectivity and stability for CO hydrogena- 2 2 2012; 336: 893–7. catalyst. Furthermore, the ZnO–ZrO tion to methanol. These promising results 3. Kuld S, Thorhauge M and Falsig H et al. Science catalyst also shows different CO hydro- should provide opportunities for follow- 2016; 352: 969–74. genation mechanisms to those proposed up research for solid-solution catalysts, 4. Kattel S, Ram´ırez PJ and Chen JG et al. Science on Cu/ZnO/Al O . There are two po- both for methanol synthesis and poten- 2 3 2017; 355: 1296–9. tential advantages of this catalyst over tially for other applications in hetero- 5. Wang J, Li G and Li Z et al. Sci Adv 2017; 3: Cu/ZnO/Al O : (1) the relatively more geneous catalysis, such as the selective 2 3 e1701290. homogeneous nature, due to the solid hydrogenation of molecules containing solution, of ZnO–ZrO makes it easier C=Obonds. to utilize in situ techniques and compu- National Science Review 1,2 Jingguang G. Chen tational methods to unravel the active 5: 607–608, 2018 Department of Chemical Engineering, Columbia sites under reaction conditions to further doi: 10.1093/nsr/nwy014 University, USA improve the catalytic performance, and Advance access publication 23 January 2018 (2) the promising stability of this catalyst Chemistry Department, Brookhaven National might provide opportunities for large- Laboratory, USA scale processes for CO hydrogenation. E-mail: jgchen@columbia.edu http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png National Science Review Oxford University Press

Enhancing catalytic selectivity and stability for CO2 hydrogenation to methanol using a solid-solution catalyst

National Science Review , Volume 5 (5) – Sep 1, 2018

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References (5)

Publisher
Oxford University Press
Copyright
Copyright © 2022 China Science Publishing & Media Ltd. (Science Press)
ISSN
2095-5138
eISSN
2053-714X
DOI
10.1093/nsr/nwy014
Publisher site
See Article on Publisher Site

Abstract

Downloaded from https://academic.oup.com/nsr/article/5/5/607/4822168 by DeepDyve user on 12 July 2022 RESEARCH HIGHLIGHTS Chen 607 MATERIALS SCIENCE Enhancing catalytic selectivity and stability for CO hydrogenation to methanol using a solid-solution catalyst 1,2 Jingguang G. Chen are at least two main issues that are poten- prevents one from obtaining conclusive The catalytic hydrogenation of CO with tially hindering the large-scale applica- information regarding the active sites un- renewable H represents a promising tion of this catalyst: (1) the lack of defini- der reaction conditions, therefore mak- pathway for reducing CO emissions. tive understanding of the active sites, and ing it difficult to develop strategies for Among the various hydrogenation prod- (2) the instability of this catalyst at rela- significant enhancement of catalytic per- ucts, the formation of methanol (CO + tively high CO conversions. For exam- formance. 3H → CH OH + H O) is preferred 2 3 2 2 ple, currently there is debate about the A recent paper by Can Li’s group because methanol can be used not only role of ZnO in this catalyst. One possi- [5] has demonstrated the possibility of as a fuel but also as a reactant to produce bility is that there is an intimate synergy significantly improving the catalytic se- olefins and other value-added chemicals between Cu and ZnO at the interface, lectivity and stability at reasonably high [1]. Due to the chemical inertness of where ZnO could act as a structural mod- CO conversions. Using a catalyst con- CO , its catalytic conversion to methanol 2 ifier, hydrogen reservoir or direct pro- sisting of a ZnO–ZrO solid solution, encounters significant challenges, in par- 2 moter for bond activation. The other pos- these authors achieved a methanol selec- ticular in maintaining catalytic selec- sibility is that a highly active ZnCu alloy tivity of 86%–91% at CO conversions tivity and stability at CO conversion 2 levels that are acceptable for industrial forms by partial reduction of ZnO or a greater than 10%. Equally important, this processes. decoration of Cu with metallic Zn. The catalyst remains stable after 500 hours At present the most commonly used inhomogeneous nature of the supported on stream. By using a combination of catalyst is Cu/ZnO/Al O [2–4]. There Cu/ZnO/Al O catalyst in most cases experimental evaluation, spectroscopic 2 3 2 3 Downloaded from https://academic.oup.com/nsr/article/5/5/607/4822168 by DeepDyve user on 12 July 2022 608 Natl Sci Rev, 2018, Vol. 5, No. 5 RESEARCH HIGHLIGHTS characterization and density functional In summary, the work by Can Li’s REFERENCES theory (DFT) calculations, this paper group has identified an alternative, solid- 1. Porosoff MD, Yan BH and Chen JG. Energy Environ also provides convincing evidence re- solution catalyst with promising catalytic Sci 2016; 9: 62–73. garding the origin of the excellent perfor- performance in terms of conversion, se- 2. Behrens M, Studt F and Kasatkin I et al. Science manceoftheZnO–ZrO solid-solution lectivity and stability for CO hydrogena- 2 2 2012; 336: 893–7. catalyst. Furthermore, the ZnO–ZrO tion to methanol. These promising results 3. Kuld S, Thorhauge M and Falsig H et al. Science catalyst also shows different CO hydro- should provide opportunities for follow- 2016; 352: 969–74. genation mechanisms to those proposed up research for solid-solution catalysts, 4. Kattel S, Ram´ırez PJ and Chen JG et al. Science on Cu/ZnO/Al O . There are two po- both for methanol synthesis and poten- 2 3 2017; 355: 1296–9. tential advantages of this catalyst over tially for other applications in hetero- 5. Wang J, Li G and Li Z et al. Sci Adv 2017; 3: Cu/ZnO/Al O : (1) the relatively more geneous catalysis, such as the selective 2 3 e1701290. homogeneous nature, due to the solid hydrogenation of molecules containing solution, of ZnO–ZrO makes it easier C=Obonds. to utilize in situ techniques and compu- National Science Review 1,2 Jingguang G. Chen tational methods to unravel the active 5: 607–608, 2018 Department of Chemical Engineering, Columbia sites under reaction conditions to further doi: 10.1093/nsr/nwy014 University, USA improve the catalytic performance, and Advance access publication 23 January 2018 (2) the promising stability of this catalyst Chemistry Department, Brookhaven National might provide opportunities for large- Laboratory, USA scale processes for CO hydrogenation. E-mail: jgchen@columbia.edu

Journal

National Science ReviewOxford University Press

Published: Sep 1, 2018

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