Steam methane reforming on a Ni-based bimetallic catalyst: density functional theory and experimental studies of the catalytic consequence of surface alloying of Ni with Ag

Wang, Hongmin; Blaylock, D. Wayne; Dam, Anh Hoang; Liland, Shirley E.; Rout, Kumar Ranjan; Zhu, Yi‐An; Green, William; Holmén, Anders; Chen, De

doi:10.1039/c7cy00101k

Cited by 56 publications

(52 citation statements)

References 59 publications

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“…This suggests that both reactions have similar kinetic relevant steps. Since the methane dissociative activation step was found to be the rate‐determining step for steam reforming at the condition studied, which suggests that it is also the rate determining step for the methane decomposition. The effect of the Ag site coverage on the initial rate of the methane decomposition and the steam reforming is thus similar.…”

Section: Resultsmentioning

confidence: 99%

Methane Activation on Bimetallic Catalysts: Properties and Functions of Surface Ni−Ag Alloy

et al. 2019

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The paper presents a fundamental study of the properties and functions of well-defined NiÀ Ag surface alloys in methane decomposition and steam reforming, aiming at providing a better understanding of the principle for manipulating the catalytic activity of steam reforming and suppressing carbon formation. A better insight of structure-property relationship was obtained by a kinetic study of the reactions on well-defined surface NiÀ Ag alloys, which were synthesized by surface redox reaction to selectively introduce Ag atoms into the surface of Ni particles supported on hydrotalcite derived support. The effects of Ni surface alloy with Ag are three-folds in general. Replacement of Ni by Ag reduces the number of active site exponentially with increasing Ag site coverage. Ag site is not only inactive, but also significantly reduces the activity of adjacent Ni sites for methane activation in both methane decomposition and steam reforming. The third effect is to block the active sites for the nucleation and growth of the filamentous carbon. The rate of methane activation at Ni step sites was found to be 16-19 times of that on Ni terrace sites. The carbon formation rate decreased linearly with Ag site coverage and the effect of Ag is divided into two regions. At low Ag site coverages (0 to 0.055), Ag atoms preferentially deposit on Ni step sites, which has a significant effect on the methane activation compared to Ag atoms on the Ni terrace sites. The results reveal that the effects of Ag site on the carbon formation in the two regions are mostly caused by the different effects of Ag on the activity of Ni step sites and terrace sites, respectively, rather than the different ensemble sizes for carbon formation proposed in the literature.[a] Dr.

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Section: Resultsmentioning

confidence: 99%

Methane Activation on Bimetallic Catalysts: Properties and Functions of Surface Ni−Ag Alloy

et al. 2019

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“…For example, addition of Au in small quantities to the surface of Ni catalysts hindered carbon formation during hydrocarbon CO 2 reforming [71,74]. In the case of Ag, Wang and co-workers [75] proposed a Ni/Ag bimetallic catalyst that possesses better surface alloying with respect to other bimetallic catalysts. They also suggested the surface redox reaction used in Ni/Ag as in Eq.…”

Section: Reaction Mechanism Of Bimetallic Ni-based Catalystsmentioning

confidence: 99%

High‐Performance Bimetallic Catalysts for Low‐Temperature Carbon Dioxide Reforming of Methane

et al. 2020

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Catalytic dry reforming of methane (DRM) is a promising way for renewable syngas production due to the utilization of both CO2 and CH4 greenhouse gases. Current approaches were made to improve the catalytic activity and coke resistance by introducing a second metal into the Ni‐based catalytic system. This bimetallic catalytic system showed a significant improvement in coke resistance due to the synergistic effect of both metals towards the reaction. This review summarizes recent developments in bimetallic catalysts in DRM which focused on the evaluation of catalysts, deactivation studies, and reaction mechanisms of developed bimetallic catalysts.

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“…It should be noted that there are many, still-developing methods involving heterogeneous catalysis for "green" hydrogen production, e.g. steam methane reforming, the water-gas shift reaction and other [166][167][168][169][170][171][172][173][174][175][176][177].…”

Section: Photoelectrochemical Production Of Hydrogenmentioning

confidence: 99%

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Wacławek

Padil

Černík

2018

Ecological Chemistry and Engineering S

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Heterogeneous catalysis is one of the fastest developing branches of chemistry. Moreover, it is strongly connected to popular environment-related applications. Owing to the very fast changes in this field, for example, numerous discoveries in nanoscience and nanotechnologies, it is believed that an update of the literature on heterogeneous catalysis could be beneficial. This review not only covers the new developments of heterogeneous catalysis in environmental sciences but also touches its historical aspects. A short introduction to the mechanism of heterogeneous catalysis with a small section on advances in this field has also been elaborated. In the first part, recent innovations in the field of catalytic air, water, wastewater and soil treatment are presented, whereas in the second part, innovations in the use of heterogeneous catalysis for obtaining sustainable energy and chemicals are discussed. Catalytic processes are ubiquitous in all branches of chemistry and there are still many unsolved issues concerning them.

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Steam methane reforming on a Ni-based bimetallic catalyst: density functional theory and experimental studies of the catalytic consequence of surface alloying of Ni with Ag

Abstract: We report a DFT and experimental study of the effects of the surface composition of a Ni/Ag alloy on methane activation and steam methane reforming compared to a pure Ni catalyst.

Cited by 56 publications

References 59 publications

Methane Activation on Bimetallic Catalysts: Properties and Functions of Surface Ni−Ag Alloy

Methane Activation on Bimetallic Catalysts: Properties and Functions of Surface Ni−Ag Alloy

High‐Performance Bimetallic Catalysts for Low‐Temperature Carbon Dioxide Reforming of Methane

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

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