One-step growth of CuO/ZnO/CeO2/ZrO2 nanoflowers catalyst by hydrothermal method on Al2O3 support for methanol steam reforming in a microreactor

Liao, Moyu; Guo, Chenxu; Guo, Wei‐Ming; Hu, Tianci; Xie, Jiawei; Gao, Pengzhao; Xiao, Hanning

doi:10.1016/j.ijhydene.2020.12.116

Cited by 35 publications

(6 citation statements)

References 53 publications

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“…38-1436) was lower for GC2, which might be related to the reduction reaction of ZnO and Ce x Zr 1– x O 2 by excess glycerol. Notably, according to our previous work and other published literature studies, the Ce x Zr 1– x O 2 solid solution is an excellent cocatalyst for Cu-based catalysts because of its high lattice oxygen activity and thermostability. , The Raman spectra of synthesized catalysts are shown in Figure d. As the content of glycerol increased, the bands at 273 and 603 cm –1 for CuO gradually decreased and eventually disappeared, while the band at 456 cm –1 for ZnO was unobserved for GC2, and the results were in accordance with the XRD analysis.…”

Section: Resultssupporting

confidence: 83%

In Situ Reduction of a CuO/ZnO/CeO₂/ZrO₂ Catalyst Washcoat Supported on Al₂O₃ Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

Liao

Qin

Guo

et al. 2021

Ind. Eng. Chem. Res.

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A CuO/ZnO/CeO2/ZrO2 catalyst slurry was prepared by mixing the catalyst powder, a polyvinyl alcohol aqueous solution, and glycerol. The slurry was coated on a Al2O3 foam ceramic support via a dip-coating method. The conventional prereduction treatment of a Cu-based catalyst by H2 was replaced by in situ reduction of the catalyst by glycerol at a low temperature of 220 °C during the loading process, thus the integration of catalyst loading and reduction was achieved. The effects of the glycerol/catalyst weight ratio and the deposition number on the physicochemical properties of the prepared catalyst and the washcoat were systematically investigated. Results showed that the optimal glycerol/catalyst weight ratio led to a complete reduction of CuO with a small amount of residual carbon. A methanol steam reforming microreactor with the Al2O3 ceramic support prepared under an appropriate deposition number exhibited a 94% methanol conversion rate and a 0.15 mol/h H2 yield at 360 °C.

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Section: Resultssupporting

confidence: 83%

In Situ Reduction of a CuO/ZnO/CeO₂/ZrO₂ Catalyst Washcoat Supported on Al₂O₃ Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

Liao

Qin

Guo

et al. 2021

Ind. Eng. Chem. Res.

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“…PL analysis is an efficient technique to detect photocarrier transfer and recombination efficiency at the surface of catalysts . Generally, quenched PL emission intensity divulges the inhibited recombination of photocarriers and vice versa .…”

Section: Resultsmentioning

confidence: 99%

“…The ZnIn 2 S 4 , an n-type semiconductor has been verified to be a potential candidate owing to its narrow band gap (2.40 eV), non-toxicity, and low cost . With E CB (−0.86 eV vs NHE) and E VB (1.54 eV vs NHE) potentials smaller contrasted to that of ZnO and Al 2 O 3 , the ZnIn 2 S 4 can be introduced to design ternary S-scheme heterojunctions with aligned CB and VB edges to produce built-in electric field (IEF) at the interfaces which consequently could control the directional flow of charge carriers . Based on the energy band positions of three semiconductors, the photoelectrons in the CB of ZnO could be transferred to the VB of ZnIn 2 S 4 and Al 2 O 3 through the S-scheme charge transfer mechanism, while photocarriers with strong redox potentials could be retained.…”

Section: Introductionmentioning

confidence: 99%

Optimal Architecture of a Dual S-Scheme ZnIn₂S₄–ZnO–Al₂O₃ Heterosystem with High H₂ Evolution Rate under Visible Light

Ahmad,

Shukrullah,

Hussain

et al. 2023

ACS Omega

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In this study, dual S-scheme ZnIn 2 S 4 −Al 2 O 3 −ZnO (ZIS−Al−Zn) heterojunctions were produced by a facile, low cost, and rapid combustion technique. These heterojunctions accelerated the photocatalytic hydrogen production due to the multichannel-promoted separation of photocarriers. By optimizing the content of the components, the synthesized ZIS−Al−Zn composite with 20 wt% of ZnIn 2 S 4 and 30 wt% of Al 2 O 3 in the ZIS−Al−Zn composite demonstrated the highest hydrogen production rate of 54.2 mmol g −1 h −1 , which was nearly 11 and 8.30 times better than ZnO−Al 2 O 3 and ZnO−ZnIn 2 S 4 composites, respectively. The results of DRS, PL, EIS, LSV, and CV techniques showed the highest shift in the light absorption, rapid interfacial transfer, and quenched recombination of photocarriers over the ternary ZIS− Al−Zn composite than single and binary catalysts. The obtained results revealed the formation of a dual S-scheme mechanism of transfer of photocarriers in ZIS−Al−Zn heterojunctions, contributing to better hydrogen production efficiency. The optimized ZIS− Al−Zn composite also exhibited good stability and reusability.

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“…There are several traditional preparation methods for the synthesis of methanol reforming catalysts, such as the hydrothermal method, dipping method, co-precipitation method, and sol-gel method [48,76,77]. Sanches et al prepared a Cu/ZnO catalyst by the co-precipitation method [75], and Liao et al synthesized a CuO/ZnO/CeO 2 /ZrO 2 catalyst by the one-step hydrothermal method [78]. A series of CuZn/MCM-41 catalysts were prepared by the co-impregnation method [77] and achieved good results.…”

Section: Improving Preparation Methodsmentioning

confidence: 99%

Advances in Enhancing the Stability of Cu-Based Catalysts for Methanol Reforming

Xiao

Lai

et al. 2022

Catalysts

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The advent of fuel cells has led to a series of studies on hydrogen production. As an excellent hydrogen carrier, methanol can be used for reforming to produce hydrogen. Copper-based catalysts have been widely used in methanol reforming due to their high catalytic activity and low-cost preparation. However, copper-based catalysts have been subjected to poor stability due to spontaneous combustion, sintering, and deactivation. Thus, the research on the optimization of copper-based catalysts is of great significance. This review analyzes several major factors that affect the stability of copper-based catalysts, and then comments on the progress made in recent years to improve the catalytic stability through various methods, such as developing preparation methods, adding promoters, and optimizing supports. A large number of studies have shown that sintering and carbon deposition are the main reasons for the deactivation of copper-based catalysts. It was found that the catalysts prepared by the modified impregnation method exhibit higher catalytic activity and stability. For the promoters and supports, it was also found that the doping of metal oxides such as MgO and bimetallic oxides such as CeO2-ZrO2 as the support could present better catalytic performance for the methanol reforming reaction. It is of great significance to discover some new materials, such as copper-based spinel oxide, with a sustained-release catalytic mechanism for enhancing the stability of Cu-based catalysts. However, the interaction mechanism between the metal and the support is not fully understood, and the research of some new material copper-based catalysts in methanol reforming has not been fully studied. These are the problems to be solved in the future.

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One-step growth of CuO/ZnO/CeO2/ZrO2 nanoflowers catalyst by hydrothermal method on Al2O3 support for methanol steam reforming in a microreactor

Cited by 35 publications

References 53 publications

In Situ Reduction of a CuO/ZnO/CeO₂/ZrO₂ Catalyst Washcoat Supported on Al₂O₃ Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

In Situ Reduction of a CuO/ZnO/CeO₂/ZrO₂ Catalyst Washcoat Supported on Al₂O₃ Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

Optimal Architecture of a Dual S-Scheme ZnIn₂S₄–ZnO–Al₂O₃ Heterosystem with High H₂ Evolution Rate under Visible Light

Advances in Enhancing the Stability of Cu-Based Catalysts for Methanol Reforming

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One-step growth of CuO/ZnO/CeO2/ZrO2 nanoflowers catalyst by hydrothermal method on Al2O3 support for methanol steam reforming in a microreactor

Cited by 35 publications

References 53 publications

In Situ Reduction of a CuO/ZnO/CeO2/ZrO2 Catalyst Washcoat Supported on Al2O3 Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

In Situ Reduction of a CuO/ZnO/CeO2/ZrO2 Catalyst Washcoat Supported on Al2O3 Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

Optimal Architecture of a Dual S-Scheme ZnIn2S4–ZnO–Al2O3 Heterosystem with High H2 Evolution Rate under Visible Light

Advances in Enhancing the Stability of Cu-Based Catalysts for Methanol Reforming

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In Situ Reduction of a CuO/ZnO/CeO₂/ZrO₂ Catalyst Washcoat Supported on Al₂O₃ Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

In Situ Reduction of a CuO/ZnO/CeO₂/ZrO₂ Catalyst Washcoat Supported on Al₂O₃ Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

Optimal Architecture of a Dual S-Scheme ZnIn₂S₄–ZnO–Al₂O₃ Heterosystem with High H₂ Evolution Rate under Visible Light