Dispersion behavior of various single metals on carbonaceous coal supports and their reactivity in methanol steam reforming

Kim, Soohyun; Prajitno, Hermawan; Yoo, Jiho; Kim, Sang-Do; Chun, Dong Hyun; Lim, Jeong-Hoon; Choi, Hokyung; Lee, Sihyun; Im, Hyuk

doi:10.1016/j.jiec.2020.11.002

Cited by 7 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak at 26.2 • was identified as graphite. As reported previously, nickel particles dispersed on LRC were mostly reduced by LRC, which was readily oxidized by taking oxygen from neighboring molecules [32]. Auer et al (1998) pointed out that a small amount of oxidized metal remained on the carbonaceous support [48].…”

Section: Characterization Of Catalystssupporting

confidence: 57%

“…>350 °C, the difference between the measurement points became small (within 3%). Previous work also reported that the activity of the LRC-supported Ni catalyst was stable upon exposure at 400 °C for 1000 h, which confirmed the thermal stability of Ni/Eco-based catalysts [32]. An extended long-term test should be, however, conducted to ensure the stability of the LRC-supported catalyst during CO2 methanation.…”

Section: Characterization Of Catalystsmentioning

confidence: 54%

“…Nevertheless, it seemed that the formation of NiO increased with Mg loading. The LRC-supported Ni catalysts prepared by incipient wetness impregnation (IWI) in the present work showed much stronger NiO peaks than those prepared by conventional wet impregnation (Imp) [32,33]. This was likely due to the presence of segregated surface NiO as a result of insufficient diffusion of the precursor solutions when the IWI method was used.…”

Section: Characterization Of Catalystsmentioning

confidence: 60%

“…In this work, a CO 2 methanation catalyst was prepared using Indonesian low-rank coal (LRC), which contains many functional groups such as carboxyl, hydroxyl, ether, and amine. These functional groups enabled the nano-dispersion of active metals in the form of nanodots; therefore, deactivation due to sintering was expected to be minimal [32,33]. The BET surface area of LRC was increased by devolatilization upon heat treatment, and the generated pores can provide an improved diffusion pathway for reactants/products.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, LRC, which is composed of thousands of different polyaromatic hydrocarbons, exhibits heterogeneity by nature and, thus, structural discontinuity, resulting in many defect sites. These defects might lower the activation energy of hydrogen dissociation, which can minimize the delay in CO 2 hydrogenation [32].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Low-Rank Coal Supported Ni Catalysts for CO2 Methanation

et al. 2021

Self Cite

View full text Add to dashboard Cite

As renewable energy source integration increases, P2G technology that can store surplus renewable power as methane is expected to expand. The development of a CO2 methanation catalyst, one of the core processes of the P2G concept, is being actively conducted. In this work, low-rank coal (LRC) was used as a catalyst support for CO2 methanation, as it can potentially enhance the diffusion and adsorption behavior by easily controlling the pore structure and composition. It can also improve the process efficiency owing to its simplicity (no pre-reduction step) and high thermal conductivity, compared to conventional metal oxide-supported catalysts. A screening of single metals (Ni, Co, Ru, Rh, and Pd) on LRC was performed, which showed that Ni was the most active. When Ni on the LRC catalyst was doped with a promoter (Ce and Mg), the CO2 conversion percentage increased by >10% compared to that of the single Ni catalyst. When the CO2 methanation activity was compared at 250–500 °C, the Ce-doped Ni/Eco and Mg-doped Ni/Eco catalysts showed similar or better activity than the commercial metal oxide-supported catalyst. In addition, the catalytic performance remained stable even after the test for an extended time (~200 h). The results of XRD, TEM, and TPR showed that highly efficient LRC-based CO2 methanation catalysts can be made when the metal dispersion and composition are modified.

show abstract

Section: Characterization Of Catalystssupporting

confidence: 57%

Section: Characterization Of Catalystsmentioning

confidence: 54%

Section: Characterization Of Catalystsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations