Effects of catalyst preparation route and promoters (Ce and Zr) on catalytic activity of CuZn/CNTs catalysts for hydrogen production from methanol steam reforming

Shahsavar, Hengameh; Taghizadeh, Majid; Kiadehi, Afshin Dehghani

doi:10.1016/j.ijhydene.2021.01.010

Cited by 50 publications

(12 citation statements)

References 68 publications

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“…The methanol conversion and H 2 selectivity were as high as 97.8% and 99.0%, respectively, while the CO selectivity was 0.4% at 300 • C. The activity of the catalyst was still stable after 40 h of operation. Catalysts prepared by traditional preparation methods have some defects, such as an uneven surface, poor contact between the two metals, and uncontrolled particle morphology with agglomeration [79,80]. Therefore, there is a need to improve the traditional synthesis method to optimize the performance of the catalyst.…”

Section: Improving Preparation Methodsmentioning

confidence: 99%

“…Some reports have also explored novel preparation methods. For example, the Ce-CuZn/CNTs catalyst prepared by microwave-assisted polyols had a better catalytic performance than those prepared by impregnation and coprecipitation [80]. There have also been CuO/ZnO/Al 2 O 3 catalysts prepared by microwave-assisted solution combustion [76], and the effect of the preparation method was also obvious.…”

Section: Improving Preparation Methodsmentioning

confidence: 99%

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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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Section: Improving Preparation Methodsmentioning

confidence: 99%

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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“…S1(c), † it's clear that there is no significant change in the crystal structure of the carbon nanotubes after the introduction of NiO and Ni. 20 What's more, the peak of nickel oxide becomes not obvious after 4 h reduction, indicating that the catalyst can be further reduced. Thus, the presence of nickel oxide in the Ni-NiO/CNTs catalyst calcined for 2 h can be attributed to the inadequate reduction.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Highly efficient Ni–NiO/carbon nanotubes catalysts for the selective transfer hydrogenation of 5-hydroxymethylfurfural to 2,5-bis(hydroxymethyl)furan

et al. 2022

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“…These three methods have been extensively used in obtaining the catalyst for MSR. Shahsavar et al 19 prepared Cu Zn/CNTs catalysts by coprecipitation method, impregnation method, and microwave-assisted polyol method, respectively. Finally, it was found that the catalysts prepared by different preparation methods had different catalytic performances.…”

Section: Introductionmentioning

confidence: 99%

“…These three methods have been extensively used in obtaining the catalyst for MSR. Shahsavar et al 19 . prepared Cu Zn/CNTs catalysts by coprecipitation method, impregnation method, and microwave‐assisted polyol method, respectively.…”

Section: Introductionmentioning

confidence: 99%

Improved performance of bimetallic oxides CuO–Y₂O₃ synthesized by sol–gel for methanol steam reforming

et al. 2022

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A series of bimetallic oxide catalysts CuO-Y 2 O 3 were synthesized by different sol-gel methods for methanol steam reforming (MSR). The performance of the synthesized catalyst was investigated by characterization of X-ray diffraction, Brunauer-Emmett-Teller, scanning electron microscopy, transmission electron microscope, and X-ray photoelectron spectrometer techniques. The effects of different complexing agents on the property of the CuO-Y 2 O 3 were identified. The results showed that CuO-Y 2 O 3 synthesized by citric acid-EDTA as a complexing agent showed the best performance, which has the largest specific surface area and shows the highest dispersion of particles and lowest average size than others. The relatively large specific surface area could increase the contact area between the catalyst and the feed, thereby improving the catalytic performance of the catalyst. Moreover, without hydrogen reduction treatment, the selectivity of hydrogen to CuO-Y 2 O 3 can reach more than 99%, whereas the selectivity of CO is only 0.3% (under the reaction conditions: temperature of 300 • C, the ratio of water to methanol of 4:1, feed flow rate of 4 ml/h). The addition of yttrium enhances the interaction of the two active components, copper and yttrium, thereby preventing the migration of the active components. This work provides a potential and economical Cu-Y oxide catalyst for onboard in situ hydrogen production from MSR, because it can reduce the hydrogen reduction process time.

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Effects of catalyst preparation route and promoters (Ce and Zr) on catalytic activity of CuZn/CNTs catalysts for hydrogen production from methanol steam reforming

Cited by 50 publications

References 68 publications

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

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

Highly efficient Ni–NiO/carbon nanotubes catalysts for the selective transfer hydrogenation of 5-hydroxymethylfurfural to 2,5-bis(hydroxymethyl)furan

Improved performance of bimetallic oxides CuO–Y₂O₃ synthesized by sol–gel for methanol steam reforming

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Effects of catalyst preparation route and promoters (Ce and Zr) on catalytic activity of CuZn/CNTs catalysts for hydrogen production from methanol steam reforming

Cited by 50 publications

References 68 publications

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

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

Highly efficient Ni–NiO/carbon nanotubes catalysts for the selective transfer hydrogenation of 5-hydroxymethylfurfural to 2,5-bis(hydroxymethyl)furan

Improved performance of bimetallic oxides CuO–Y2O3 synthesized by sol–gel for methanol steam reforming

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Improved performance of bimetallic oxides CuO–Y₂O₃ synthesized by sol–gel for methanol steam reforming