Hydrogenation of CO2 to methanol over Pd–Cu/CeO2 catalysts

Choi, Eun Jeong; Lee, Yong Hee; Lee, Dae Won; Moon, Dong Ju; Lee, Kwan Young

doi:10.1016/j.mcat.2017.02.005

Cited by 105 publications

(41 citation statements)

References 41 publications

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“…This is indeed the case of CeO x /Cu(111), whose superior activity for methanol production is attributed to the abundance of Ce 3+ sites that can stabilize CO2δ- intermediates. The synergistic effect between the metal and CeO 2 has been reported also on conventional systems in which the metal is deposited onto the ceria surface, and again the enhanced activity for CO 2 hydrogenation has been attributed to the increased reduction of ceria promoted by metal-support interaction and the subsequent formation of oxygen vacancies (Tsubaki and Fujimoto, 2003; Choi et al, 2017; Vourros et al, 2017; Malik et al, 2018). The relevance of this interaction is nicely demonstrated by Vourros et al, who compares the activity of gold nanoparticles supported on different oxides.…”

Section: Co2 Hydrogenation To Value Added Chemicals Other Than Methanementioning

confidence: 73%

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

2019

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Reducing greenhouse emissions is of vital importance to tackle the climate changes and to decrease the carbon footprint of modern societies. Today there are several technologies that can be applied for this goal and especially there is a growing interest in all the processes dedicated to manage CO 2 emissions. CO 2 can be captured, stored or reused as carbon source to produce chemicals and fuels through catalytic technologies. This study reviews the use of ceria based catalysts in some important CO 2 valorization processes such as the methanation reaction and methane dry-reforming. We analyzed the state of the art with the aim of highlighting the distinctive role of ceria in these reactions. The presence of cerium based oxides generally allows to obtain a strong metal-support interaction with beneficial effects on the dispersion of active metal phases, on the selectivity and durability of the catalysts. Moreover, it introduces different functionalities such as redox and acid-base centers offering versatility of approaches in designing and engineering more powerful formulations for the catalytic valorization of CO 2 to fuels.

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Section: Co2 Hydrogenation To Value Added Chemicals Other Than Methanementioning

confidence: 73%

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

2019

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“…It was explained that the interaction between Pd and Cu decreased the Cu-Cu bond distance due to the strong electronic perturbation, resulting in well-dispersed Cu species (Kugai et al, 2016). In this way, the aggregation or agglomeration of Cu particles was suppressed due to the interaction with Pd, which was highly dispersed on CeO 2 support (Choi et al, 2017). According to the XPS results, the peaks for Cu 2p electrons in Pd-Cu/CeO 2 catalysts appeared at relatively lower binding energy than those in Cu/CeO 2 catalyst, meaning that Cu sites in Pd-Cu/CeO 2 catalysts were more abundant in electrons and could donate them to Cu, enabling Cu to stabilize in a more reduced state (Fox et al, 2008).…”

Section: Bimetallic Cu-based Catalystsmentioning

confidence: 99%

“…According to the XPS results, the peaks for Cu 2p electrons in Pd-Cu/CeO 2 catalysts appeared at relatively lower binding energy than those in Cu/CeO 2 catalyst, meaning that Cu sites in Pd-Cu/CeO 2 catalysts were more abundant in electrons and could donate them to Cu, enabling Cu to stabilize in a more reduced state (Fox et al, 2008). Thus, Pd promotion generated more electron-rich Cu sites by electron transfer (Choi et al, 2017). Pd can also improve the reducibility of CuO and enrich the catalyst surface with electrons, enabling the activation of CO 2 by interaction with the carbon atom of CO 2 (Choi et al, 2017).…”

Section: Bimetallic Cu-based Catalystsmentioning

confidence: 99%

“…Thus, Pd promotion generated more electron-rich Cu sites by electron transfer (Choi et al, 2017). Pd can also improve the reducibility of CuO and enrich the catalyst surface with electrons, enabling the activation of CO 2 by interaction with the carbon atom of CO 2 (Choi et al, 2017). A strong Pd-Cu bimetallic promoting effect on the formation of methanol from CO 2 hydrogenation was observed, which is due to the synergetic effect between Pd and Cu as a result of the Pd-Cu alloy formation (Jiang et al, 2015).…”

Section: Bimetallic Cu-based Catalystsmentioning

confidence: 99%

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Improving the Cu/ZnO-Based Catalysts for Carbon Dioxide Hydrogenation to Methanol, and the Use of Methanol As a Renewable Energy Storage Media

2020

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Heterogeneous catalytic hydrogenation of carbon dioxide (CO2) to methanol is a practical approach to mitigating its greenhouse effect in the environment while generating good economic profits. Though applicable on the industrial scale through the syngas route, the catalyst of Cu/ZnO/Al2O3 suffers from a series of technical problems when converting CO2 to methanol directly, which include low single-pass conversion, low methanol selectivity, requiring high pressure and fast deactivation by the reverse water gas shift reaction. Over the years, intensive research efforts have been devoted to proffering solutions to these problems by modifying the existing catalyst or developing new active catalysts. However, the open question is if this type of widely used industrial catalyst still promising for CO2 methanolizing reaction or not? This paper reviews the history of the methanol production in industry, the impact of CO2 emission on the environment, and analyzes the possibility of the Cu/ZnO-based catalysts for the direct hydrogenation of CO2 to methanol. We not only address the theoretical and technical aspects but also provide insightful views on catalyst development.

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“…Vários trabalhos evidenciam esse desbalanceamento elementar na superfície, sendo verificado de forma mais pronunciada em óxidos dopados ou mistos (CHANG; WANG; CHEN, 2017;CHOI et al, 2017;JUNG et al, 2008;MEKKI-BERRADA et al, 2012).…”

Section: Resultsunclassified

Estudo dos efeitos de estratégias de manipulação química e estrutural em catalisadores heterogêneos aplicados à hidrogenação de CO>sub<2>/sub< a metanol

Rossi¹

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Nowadays, factors such as population growth, indiscriminate use of water, and contamination of its sources and reservoirs created a need for actions capable of promoting sustainable management of this resource through the conscious use, treatment, and reuse of this resource.Despite the high efficiency of modern treatment systems, some aspects can still be improved, such as the proper destination of the CO2 molecules generated in the anaerobic decomposition stage of organic contaminants, considering that this is the main greenhouse gas whose high concentrations in the atmosphere have led to the recent climate issues. Among the possibilities for this purpose, one of the most promising strategies involves the conversion of this compound into molecules of high added value, such as methanol through hydrogenation reactions through the use of heterogeneous catalysts. In this context, the present work aims to apply strategies for manipulating the chemical and structural nature of catalysts based on copper and zirconia or ceria, in an attempt to achieve considerable improvements in the catalytic performance presented by them. In the first stage, the effects of modifying these materials with indium atoms were studied. As a result, it was found that a considerable increase in methanol selectivity occurred due to indium atoms effects involving changes in the intermediate adsorption and activation energy for specific stages of hydrogenation that are, in general, very high, hindering methanol production. Also, the greater basicity of these materials due to oxygen vacancies was important. In the second stage, the effects of the catalysts encapsulation by porous silica coating were studied. It was observed that the core-shell type materials presented a performance remarkably superior to the other catalysts due to the efficiency of the silica coating in minimizing particles sintering during the heat treatment steps in the synthesis procedure and in reaction steps occurring at high temperatures. In addition to the effects arising from the indium atoms presence, the low dimensions and high homogeneity of the particles obtained enabled considerable values of basicity which have led to high selectivity values for methanol. Also, the high copper dispersion and metallic area values have led to higher CO2 conversion, which associated to the high methanol selectivity, resulted in significant molar productivity for methanol in all tested temperature ranges.

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Hydrogenation of CO2 to methanol over Pd–Cu/CeO2 catalysts

Cited by 105 publications

References 41 publications

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

Improving the Cu/ZnO-Based Catalysts for Carbon Dioxide Hydrogenation to Methanol, and the Use of Methanol As a Renewable Energy Storage Media

Estudo dos efeitos de estratégias de manipulação química e estrutural em catalisadores heterogêneos aplicados à hidrogenação de CO>sub<2>/sub< a metanol

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