Influence of the support structure and composition of Ni–Cu-based catalysts on hydrogen production by methanol steam reforming

Лыткина, А. А.; Zhilyaeva, N. A.; Ермилова, М. М.; Орехова, Н. В.; Yaroslavtsev, A. B.

doi:10.1016/j.ijhydene.2015.05.094

Cited by 86 publications

(49 citation statements)

References 37 publications

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“…These results indicate that the addition of Ni to the Cu-SiO 2 catalyst increased the stability of the system during the xylitol hydrogenolysis process due to the formation of stable Cu-Ni alloy. Lytkina et al [32] studied Ni-Cu catalysts supported on ZrO 2 prepared by subsequent impregnation method. The synthesized catalysts were also characterized by X-ray diffraction method.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Production on Cu-Ni Catalysts via the Oxy-Steam Reforming of Methanol

et al. 2020

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In this work, bimetallic Cu-Ni catalysts supported on binary oxides containing ZnO, ZrO 2 , CeO 2 and Al 2 O 3 were investigated in hydrogen production via the oxidative steam reforming of methanol (OSRM). Their physicochemical properties were extensively studied using various methods such as BET, TPR-H 2 , TPD-NH 3 , XRD, SEM-EDS, ToF-SIMS and XPS. The reactivity measurements showed that the active phase and support composition played an important role in the activity of the catalyst in the OSRM. The most active system at higher temperatures was 30% Cu-10% Ni/CeO 2 ·Al 2 O 3 , with high catalytic activity attributed to the Cu 0.8 Ni 0.2 alloy formation. In addition, the reactivity results showed that the most active catalyst exhibited high acidity and was easily reduced. At low temperatures, the best catalytic properties were exhibited by 30% Cu-10% Ni/ZrO 2 ·Al 2 O 3 . The reactivity and physicochemical properties of the studied catalysts confirmed the crucial role of alloy composition on their catalytic properties in the oxy-steam reforming of methanol. The obtained results validate the possibility of using Cu-Ni catalysts for hydrogen production.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Production on Cu-Ni Catalysts via the Oxy-Steam Reforming of Methanol

et al. 2020

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“…However, Cu-catalyst suffers from some serious drawbacks such as pyrophoricity and catalyst sintering [5][6][7]. To overcome the drawbacks of Cu catalyst, numerous alternative materials have been examined, including noble metal catalysts [8][9][10], Ni-Cu alloy-based catalysts [11][12][13], and Ni-based catalysts [7,[14][15][16]. On one hand, noble metals (Pd, Pt) are known to be the most active catalysts for MSR [8][9][10], but the high prices limit their large-scale industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, Ni-Cu alloys are shown to be better than Cu as the MSR catalyst. For example, Lytkina et al showed that Ni 0.2 Cu 0.8 /ZrO 2 had the highest activity and best CO 2 selectivity among their Ni-Cu alloy catalysts [11]. Khzouz et al attributed their observed high MSR activity of Cu-Ni alloy to the higher methanol decomposition activity of Ni than Cu [12].…”

Section: Introductionmentioning

confidence: 99%

Density Functional Theory Based Micro- and Macro-Kinetic Studies of Ni-Catalyzed Methanol Steam Reforming

Lin

2020

Catalysts

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The intrinsic mechanism of Ni-catalyzed methanol steam reforming (MSR) is examined by considering 54 elementary reaction steps involved in MSR over Ni(111). Density functional theory computations and transition state theory analyses are performed on the elementary reaction network. A microkinetic model is constructed by combining the quantum chemical results with a continuous stirring tank reactor model. MSR rates deduced from the microkinetic model agree with the available experimental data. The microkinetic model is used to identify the main reaction pathway, the rate determining step, and the coverages of surface species. An analytical expression of MSR rate is derived based on the dominant reaction pathway and the coverages of surface species. The analytical rate equation is easy to use and should be very helpful for the design and optimization of the operating conditions of MSR.

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“…In this case, the existing carbon-carbon and carbon-hydrogen bonds are broken much more readily and the contribution from alcohol decomposition accompanied by the formation of CO is much more significant [129]. As in the case of FCs, the activity and selectivity of the catalysts can be increased by switching to bimetallic alloys [129,130].…”

Section: Catalytic Steam Reformingmentioning

confidence: 99%

Interfaces in Materials for Hydrogen Power Engineering

Стенина

Yaroslavtsev

2019

Membr. Membr. Technol.

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Hydrogen power engineering is based on the production of hydrogen and subsequent oxidation of it to generate electrical energy. Using the example of ion-exchange membranes, catalysts for low-temperature fuel cells, and catalysts for alcohol steam reforming, the features of the transfer, catalysis, and electrocatalysis in hydrogen power engineering are discussed. Particular attention is paid to the role of interfaces. The occurrence of transport processes in ion-exchange membranes is determined by a system of pores and channels that are formed in the membranes owing to self-organization processes. The main selective transport of counterions occurs in a thin Debye layer at the interface between the polymer and the water solution that fills the pores. The transport of gases in these systems occurs through an electrically neutral solution localized in the center of the pores; it can be controlled by introducing nanoparticles into the pores. Catalytic processes in fuel cells occur at the interface between three phases, namely, the catalyst, the support, and the proton-conducting component. The role of the support in the stabilization and enhancement of the power of fuel cells is discussed. Despite the significant difference, the laws governing the catalytic processes of alcohol steam reforming are similar to those of fuel cells in many respects. The nature of metal catalysts is responsible for the preferred direction of the process, whereas the nature of the support largely determines the catalyst performance.

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Influence of the support structure and composition of Ni–Cu-based catalysts on hydrogen production by methanol steam reforming

Cited by 86 publications

References 37 publications

Hydrogen Production on Cu-Ni Catalysts via the Oxy-Steam Reforming of Methanol

Hydrogen Production on Cu-Ni Catalysts via the Oxy-Steam Reforming of Methanol

Density Functional Theory Based Micro- and Macro-Kinetic Studies of Ni-Catalyzed Methanol Steam Reforming

Interfaces in Materials for Hydrogen Power Engineering

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