Effect of the carbon support graphitization on the activity and thermal stability of Ru-Ba-Cs/C ammonia decomposition catalysts

Иост, К. Н.; Борисов, В. А.; Темерев, В. Л.; Смирнова, Н. С.; Surovikin, Yury V.; Тренихин, М. В.; Арбузов, А. Б.; Gulyaeva, T. I.; Shlyapin, D. A.; Цырульников, П. Г.; Vedyagin, A. A.

doi:10.1007/s11144-019-01555-3

Cited by 17 publications

(15 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The D band is a breathing mode in A 1g symmetry and its intensity is connected with the presence of sixfold rings. A broad and symmetric 2D peak (~2670 cm −1 ) indicates the turbostratic structuring of the carbon material [36], in agreement with the XRD data (Figure 2).…”

Section: Raman Spectral Analysissupporting

confidence: 88%

“…No particular differences were observed between C1 and C2. Characteristic signals of graphite and turbostratic carbon [35,36] can be seen, which indicates a partial ordering in the crystalline structure of the carriers.…”

Section: Xrpdmentioning

confidence: 97%

“…Two fresh carbon supports were also studied (Figure 7a). All the obtained Raman spectra contained an intense band at about 1596 cm −1 corresponding to the in-plane, involving symmetric stretching vibrations of the C=C sp2 bonds (G band) [36]. This mode does not require the presence of sixfold rings, thus it occurs at all sp2 sites.…”

Section: Raman Spectral Analysismentioning

confidence: 97%

See 2 more Smart Citations

Stability of Ruthenium/Carbon Catalytic Materials during Operation in Carbon Monoxide Methanation Process

Truszkiewicz,

Latoszek,

Ojrzyńska

et al. 2023

Catalysts

View full text Add to dashboard Cite

The stable activity of catalysts is an important characteristic, which determines their suitability for industrial applications. The purpose of this study was to investigate the stability of ruthenium systems deposited on carbon under conditions simulating long-term operation in CO methanation. Two series of Ru/carbon catalysts were prepared and studied during CO methanation in a hydrogen-rich gas stream. Two graphitized carbons substantially differing in their surface area (23 and 1457 m2/g) were used as supports, and Ru loadings of 3 and 6 wt.% were applied. The stability of Ru/C catalysts was examined in a 240 h time-on-stream test. The samples were characterized by CO chemisorption, XRD, TEM, Raman spectroscopy, TG–MS studies and CO-TPD. The stability of the catalysts over 240 h in the CO + H2 mixture depended on the support type and Ru loading. The highest CO conversion and increased activity was observed for both catalysts with Ru dispersion above 80%. The tested systems were also resistant to carbon deposition. Interestingly, a similar level of activity was obtained for 3 wt.% Ru supported on the low surface area carbon. It is presumed that the similar activity observed for systems with such different ruthenium dispersion is related to the presence of active sites of different strength and structure on the surface of both small and large Ru particles.

show abstract

Section: Raman Spectral Analysissupporting

confidence: 88%

Section: Xrpdmentioning

confidence: 97%

Section: Raman Spectral Analysismentioning

confidence: 97%

See 1 more Smart Citation

Stability of Ruthenium/Carbon Catalytic Materials during Operation in Carbon Monoxide Methanation Process

Truszkiewicz,

Latoszek,

Ojrzyńska

et al. 2023

Catalysts

View full text Add to dashboard Cite

show abstract

“…They found that, when the Ba/Ru ratio increased, the thermal stability of the catalyst also increased, although the catalytic performance in the catalytic reaction decreased. In another study, they prepared various kinds of Ru–Ba–Cs/C catalysts supported on Sibunit, and they reported that the graphitization procedure of the support greatly promoted the catalytic performance of the catalyst . In order to compare different catalysts, a catalytic efficiency parameter (CEP) was proposed to act as a ratio of the converted NH 3 (g) to the carbon loss (g).…”

Section: Ammonia Decomposition Hydrogen Production Catalystmentioning

confidence: 99%

“…In another study, they prepared various kinds of Ru−Ba−Cs/C catalysts supported on Sibunit, and they reported that the graphitization procedure of the support greatly promoted the catalytic performance of the catalyst. 122 In order to compare different catalysts, a catalytic efficiency parameter (CEP) was proposed to act as a ratio of the converted NH 3 (g) to the carbon loss (g). According to the CEP criterion, the sample that exhibited the best performance is Ru−Ba−Cs/C(g) with a CEP of 1577 g/g.…”

Section: Energymentioning

confidence: 99%

Review on Ru-Based and Ni-Based Catalysts for Ammonia Decomposition: Research Status, Reaction Mechanism, and Perspectives

Guan

Zhou

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Hydrogen (H2) is a zero-carbon and high-energy-density fuel promising to replace fossil fuels for power generation and clean energy. However, hydrogen still faces enormous challenges in terms of production, transportation, and storage. Ammonia (NH3) is a promising H2 (17.7 wt %) carrier that easily overcomes the difficulties associated with H2 storage and transport. However, for the NH3 decomposition hydrogen production reaction, the biggest challenge at present is to achieve complete conversion of ammonia under a relatively high space velocity (about 30,000 mL·gcat –1·h–1) at low-temperature conditions (about 350 °C) with reasonable price catalysts. At present, the most efficient ammonia decomposition catalyst is a Ru-based catalyst doped with K, Ba, and Cs and supported on various carbon supports and metal oxides. Otherwise, the catalysts that exhibited the most outstanding activity among non-noble metal catalysts are nickel-based, and because of their low cost, nickel is regarded as a reasonable alternative candidate material for NH3 decomposition. Advances in the study of reaction kinetics of ammonia decomposition reactions and whether the rate-determining step of the ammonia decomposition reaction is the cleavage of the first N–H bond or the desorption of nitrogen gas are also discussed. This review provides a comprehensive consideration of the recent development of Ru-based and Ni-based catalysts and proposed mechanisms of ammonia decomposition on them are examined. The effects of preparation methods, support, and promoters on catalyst activity were studied and theoretical bases for the design of future catalysts are presented. At last, a brief introduction to catalytic membrane reactor technology in recent years is given. This review can serve as a comprehensive work for designing novel catalysts.

show abstract

Ruthenium Catalyst for Ammonia Decomposition

Fujitani

Nakamura

2022

CO2 Free Ammonia as an Energy Carrier

View full text Add to dashboard Cite

Effect of the carbon support graphitization on the activity and thermal stability of Ru-Ba-Cs/C ammonia decomposition catalysts

Cited by 17 publications

References 43 publications

Stability of Ruthenium/Carbon Catalytic Materials during Operation in Carbon Monoxide Methanation Process

Stability of Ruthenium/Carbon Catalytic Materials during Operation in Carbon Monoxide Methanation Process

Review on Ru-Based and Ni-Based Catalysts for Ammonia Decomposition: Research Status, Reaction Mechanism, and Perspectives

Ruthenium Catalyst for Ammonia Decomposition

Contact Info

Product

Resources

About