Cu/ZnO and Cu/ZnO/ZrO 2  catalysts used for methanol steam reforming

Sanches, Sabrina Guimarães; Flores, Jhonny Huertas; Silva, M.I. Pais da

doi:10.1016/j.mcat.2018.05.012

Cited by 50 publications

(14 citation statements)

References 53 publications

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“…Comparison of this material with previously investigated materials (Figure 4) emphasizes the excellent performance, showing the highest observed selectivity and similar activity to ZnPd/ZnO aerogels. 37 It outperforms Cu-based materials, 9,12,38 InPd/In 2 O 3 materials, 21,39 In−Pt-based materials, 24 and other materials based upon intermetallic compounds 12,20,40,41 by an order of magnitude in activity and shows at least 50% less CO. The difference in activity at 300 °C with and without heat treatment at 400 °C indicates material changes upon heating and subsequent cooling that do not occur under prolonged time on stream at 300 °C.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…Methanol steam reforming (MSR, eq ) is likely to play a fundamental role in future energy storage and distribution systems. − Catalytic materials, which are often derived from the industrial methanol synthesis catalyst Cu/ZnO/Al 2 O 3 , − must exhibit a high CO 2 selectivity by suppressing the concurring methanol decomposition (eq ) and reverse water gas shift (WGS) reaction (eq ) for direct use of the product gases in proton-exchange membrane fuel cells …”

Section: Introductionmentioning

confidence: 99%

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Unprecedented Catalytic Activity and Selectivity in Methanol Steam Reforming by Reactive Transformation of Intermetallic In–Pt Compounds

et al. 2021

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Hydrogen storage in the form of small molecules and subsequent release are foreseen to play a fundamental role in future energy systems or carbon cycles. Methanol is an ideal hydrogen carrier due to the high H/C ratio, the lack of C–C bonds, and being liquid under ambient conditions. Methanol steam reforming is an advantageous reaction for the release of the chemically bound hydrogen. Pd- or Pt-based intermetallic compounds have shown to be CO2-selective and long-term stable catalytic materials. However, an intrinsic understanding of the underlying processes is still lacking. In this study, we show that the redox activity in the In–Pt system can be steered by gas-phase changes and leads to highly active catalytic materials at 300 °C [1500 mol (H2)/(mol (Pt) × h)] with an excellent CO2 selectivity of 99.5%, thus clearly outperforming previous materials. Reactive transformations between In2Pt, In3Pt2, and In2O3 have been identified to cause the high selectivity. Redox activity of intermetallic compounds as part of the catalytic cycle was previously unknown and adds an understanding to the concept of different adsorption sites.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Unprecedented Catalytic Activity and Selectivity in Methanol Steam Reforming by Reactive Transformation of Intermetallic In–Pt Compounds

et al. 2021

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“…Copper supported on ZnO/Al 2 O 3 oxides is the most commonly used catalyst for methanol steam reforming due to its high activity at low temperatures and high selectivity to H 2 . ,,− ,,,− In this catalyst, oxygenated molecules bind with the “ideal” strength and configuration to metallic Cu, which facilitates the activation of water molecules and methanol on the surface to produce carboxyl- and carbonyl-containing species that can easily undergo decomposition to CO 2 and H 2 . ,,, This results in high selectivity to the reforming products (i.e., CO 2 and H 2 ) and very low decarbonylation and methanation byproducts (i.e., CO and CH 4 ) . For this reason, Cu catalysts have been the subject of extensive research using partially reducible metal oxides (e.g., CeO 2 and TiO 2 ) ,,− ,,,− and nonreducible metal oxides (e.g., SiO 2 , Al 2 O 3 ) as catalyst supports. ,,,,,− …”

Section: Introductionmentioning

confidence: 99%

Interplay of support chemistry and reaction conditions on copper catalyzed methanol steam reforming

Díaz‐Pérez

Moya²,

Serrano‐Ruiz³

et al. 2018

Ind. Eng. Chem. Res.

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A series of Cu catalysts supported on SiO2, Al2O3–SiO2, TiO2 rutile, and Cu/TiO2 anatase metal oxides has been studied for methanol reforming in the vapor phase. The highest activity was obtained on Cu/SiO2 catalysts (5493 μmol H2 min–1·gcat–1) followed by Cu/TiO2 rutile, Cu/Al2O3–SiO2, and anatase. XRD and HRTEM characterization after reaction revealed that on Cu/SiO2 significant sintering occurred during reaction. In contrast, the particle size growth on Cu/TiO2 rutile and anatase was less pronounced, which could be associated with the interaction between Cu clusters and TiO2. Characterization by TGA showed that on Cu/Al2O3–SiO2 the main cause of deactivation was coke deposition.

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“…The Cu/ZnO catalyst, as an important industrial catalyst, is widely employed in methanol synthesis, methanol steam reforming, and low‐temperature water‐gas shift 5‐7 . The most common synthetic method is the co‐precipitation, 8,9 where co‐precipitates are formed through the rapid precipitation reaction of Cu 2+ and Zn 2+ ions.…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulence in micro‐reactors on ultrafast competitive reactions in Cu‐Zn co‐precipitation

Jiang

Chen

et al. 2021

AIChE Journal

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The enhancement of turbulence was considered to be able to bring about better mixing and more uniform distribution of concentration generally, but its influence on ultrafast competitive reactions is an open question. Cu‐Zn co‐precipitation was carried out in three types of micro‐reactors and the turbulent intensity was regulated by changing flow rate and ultrasound power, respectively. Energy‐dispersive spectrometer of precipitates and characteristic aging time indicate the best uniformity of Cu‐Zn distribution in precipitates appears at moderate turbulent intensity. The numerical simulation shows the uniformities of precipitation both in time and in space are impacted by mixing simultaneously but with opposite direction, resulting in the appearance of maximum. The unevenness of Cu‐Zn distribution caused by inconsistent reaction rates along the time will be erased during subsequent structural evolution, while that caused by diverse reaction rates at various positions can survive and further affect the structure and performance of catalysts.

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Cu/ZnO and Cu/ZnO/ZrO 2 catalysts used for methanol steam reforming

Cited by 50 publications

References 53 publications

Unprecedented Catalytic Activity and Selectivity in Methanol Steam Reforming by Reactive Transformation of Intermetallic In–Pt Compounds

Unprecedented Catalytic Activity and Selectivity in Methanol Steam Reforming by Reactive Transformation of Intermetallic In–Pt Compounds

Interplay of support chemistry and reaction conditions on copper catalyzed methanol steam reforming

Effect of turbulence in micro‐reactors on ultrafast competitive reactions in Cu‐Zn co‐precipitation

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