Selective hydrogenation of CO2 and CO into olefins over Sodium- and Zinc-Promoted iron carbide catalysts

Zhang, Zhiqiang; Yin, Haoren; Yu, Guangde; He, Shun; Kang, Jincan; Liu, Zhiming; Cheng, Kang; Zhang, Qinghong; Wang, Ye

doi:10.1016/j.jcat.2021.01.036

Cited by 63 publications

(40 citation statements)

References 64 publications

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“…Meanwhile, the generation of CO from the RWGS reaction was faster over ZnO/H‐ZSM‐5 than that over ZnO∥H‐ZSM‐5 (Table S1). This could be attributed to the highly dispersed [ZnOH] + species, which were considered as the active sites for the RWGS reaction [36] . It is noteworthy that the low alkanes were the main products in CO 2 hydrogenation over ZnO/H‐ZSM‐5 (Table S1), while, the C 5+ hydrocarbons selectivity exceeded 60 % in methanol conversion over the same composite catalyst (Table S4).…”

Section: Resultsmentioning

confidence: 96%

“…This could be attributed to the highly dispersed [ZnOH] + species,w hich were considered as the active sites for the RWGS reaction. [36] It is noteworthy that the low alkanes were the main products in CO 2 hydrogenation over ZnO/H-ZSM-5 (Table S1), while,t he C 5+ hydrocarbons selectivity exceeded 60 %i nm ethanol conversion over the same composite catalyst (Table S4). This might be due to the mechanism that the [ZnOH] + sites facilitated the hydrogenation of C 2 -C 4 olefins and terminated the olefin oligomerization in the reaction atmosphere containing H 2 .…”

Section: Angewandte Chemiementioning

confidence: 94%

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Visualizing Element Migration over Bifunctional Metal‐Zeolite Catalysts and its Impact on Catalysis

Wang

Wal

et al. 2021

Angewandte Chemie

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The catalytic performance of composite catalysts is not only affected by the physicochemical properties of each component, but also the proximitya nd interaction between them. Herein, we employf our representative oxides (In 2 O 3 , ZnO,C r 2 O 3 ,a nd ZrO 2 )t oc ombine with H-ZSM-5 for the hydrogenation of CO 2 to hydrocarbons directed by methanol intermediate and clarify the correlation between metal migration and the catalytic performance.The migration of metals to zeolite driven by the harsh reaction conditions can be visualizedb ye lectron microscopy, meanwhile,t he change of zeolite acidity is also carefully characterized. The protonic sites of H-ZSM-5 are neutralized by mobile indium and zinc species via as olid ion-exchange mechanism, resulting in ad rastic decrease of C 2+ hydrocarbon products over In 2 O 3 /H-ZSM-5 and ZnO/H-ZSM-5. While,t he thermomigration ability of chromium and zirconium species is not significant, endowing Cr 2 O 3 /H-ZSM-5 and ZrO 2 /H-ZSM-5 catalysts with high selectivity of C 2+ hydrocarbons.

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Section: Resultsmentioning

confidence: 96%

Section: Angewandte Chemiementioning

confidence: 94%

Visualizing Element Migration over Bifunctional Metal‐Zeolite Catalysts and its Impact on Catalysis

Wang

Wal

et al. 2021

Angewandte Chemie

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“…The enhancement of both CO 2 conversion and the selectivity toward C 2 -C 7 hydrocarbons can also be achieved by the addition of a small amount of the alkali metals [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77]. This is due to the increased basicity of the catalyst, inhibition of H 2 dissociative adsorption and enhancement of iron carbide formation.…”

Section: Promotion With Alkali Metalsmentioning

confidence: 99%

“…Therefore, changes in the chemisorption properties of the metal surface toward the reactive molecules are induced by geometric and electronic-type effects of the promoters [60]. As an example, Figure 7 shows the enhancement of the CO2 conversion of Fe-Co/K/Al2O3 catalysts with respect to catalyst without K [50], which can be explained considering the enhancement of the basicity of the catalyst surface leading to easy desorption of olefin products [73]. The presence of alkali on the catalyst surface has geometrical and electronic effects deduced from the changes in the chemisorption capacity of the reactants on the metal surface [60].…”

Section: Promotion With Alkali Metalsmentioning

confidence: 99%

Catalysts for the Conversion of CO2 to Low Molecular Weight Olefins—A Review

et al. 2021

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There is a large worldwide demand for light olefins (C2=–C4=), which are needed for the production of high value-added chemicals and plastics. Light olefins can be produced by petroleum processing, direct/indirect conversion of synthesis gas (CO + H2) and hydrogenation of CO2. Among these methods, catalytic hydrogenation of CO2 is the most recently studied because it could contribute to alleviating CO2 emissions into the atmosphere. However, due to thermodynamic reasons, the design of catalysts for the selective production of light olefins from CO2 presents different challenges. In this regard, the recent progress in the synthesis of nanomaterials with well-controlled morphologies and active phase dispersion has opened new perspectives for the production of light olefins. In this review, recent advances in catalyst design are presented, with emphasis on catalysts operating through the modified Fischer–Tropsch pathway. The advantages and disadvantages of olefin production from CO2 via CO or methanol-mediated reaction routes were analyzed, as well as the prospects for the design of a single catalyst for direct olefin production. Conclusions were drawn on the prospect of a new catalyst design for the production of light olefins from CO2.

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“…Zinc helps to increase the activity of these catalysts in the Fischer–Tropsch process [ 24 , 25 ], increases the adsorption of carbon dioxide [ 24 , 26 , 27 ] and hydrogen [ 27 , 28 ], and increases the activity in the reverse water shift reaction [ 29 , 30 ]. It has been shown that zinc increases the dispersity of iron particles and acts as a structural promoter [ 31 , 32 , 33 , 34 , 35 , 36 ]. Recently, it has been suggested that the addition of zinc is not only a structural promoter, but also increases the stability of the iron-containing catalyst owing to electron density transfer from zinc to iron, promotes the formation of iron carbides, and suppresses the formation of magnetite Fe 3 O 4 during the operation of the iron–zinc coprecipitated catalyst [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

et al. 2022

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In this work, we studied the role of zinc in the composition of supported iron-containing catalysts for the hydrogenation of CO2. Various variants of incipient wetness impregnation of the support were tested to obtain catalyst samples. The best results are shown for samples synthesized by co-impregnation of the support with a common solution of iron and zinc precursors at the same molar ratio of iron and zinc. Catalyst samples were analyzed by various methods: Raman, DRIFT-CO, TPR-H2, XPS, and UV/Vis. The introduction of zinc leads to the formation of a mixed ZnFe2O4 phase. In this case, the activation of the catalyst proceeds through the stage of formation of the metastable wustite phase FeO. The formation of this wustite phase promotes the formation of metallic iron in the composition of the catalyst under the reaction conditions. It is believed that the presence of metallic iron is a necessary step in the formation of iron carbides—that is, active centers for the formation and growth of chain in the hydrocarbons. This leads to an increase in the activity and selectivity of the formation of hydrocarbons in the process of CO2 hydrogenation.

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Selective hydrogenation of CO2 and CO into olefins over Sodium- and Zinc-Promoted iron carbide catalysts

Cited by 63 publications

References 64 publications

Visualizing Element Migration over Bifunctional Metal‐Zeolite Catalysts and its Impact on Catalysis

Visualizing Element Migration over Bifunctional Metal‐Zeolite Catalysts and its Impact on Catalysis

Catalysts for the Conversion of CO2 to Low Molecular Weight Olefins—A Review

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

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