Deactivation characteristics of Ni and Ru catalysts in tar steam reforming

Park, Seo Yun; Oh, Gunung; Kim, Kwang‐Yul; Seo, Myung Won; Won, Ho; Mun, Tae Young; Lee, Jae Goo; Yoon, Sang Jun

doi:10.1016/j.renene.2016.12.045

Cited by 70 publications

(14 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, silicon can react with alkali metals to form alkali silicates, thus inhibiting their catalytic activity [42]. The sintering of metals, such as ruthenium, can also result in the catalyst deactivation [43]. Due to the chemical complexity of chars from bio-waste, all the above mentioned deactivation mechanisms could simultaneously occur during tar cracking reaction.…”

Section: Introductionmentioning

confidence: 99%

Reactivity and deactivation mechanisms of pyrolysis chars from bio-waste during catalytic cracking of tar

et al. 2019

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Reactivity and deactivation mechanisms of pyrolysis chars from bio-waste during catalytic cracking of tar

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Coke deposited over the catalyst surface can be divided into amorphous and filamentous carbons. In the literature, amorphous carbon (oxidised around 400 °C) causes catalyst deactivation, whereas filamentous carbon (oxidised at 550-750 °C) does not significantly contribute to deactivation but leads to reactor blockage and pressure depression [17]. Additional weight gain was also observed in Figure 2, which might be explained by the oxidation of metallic Ni particles.…”

Section: Resultsmentioning

confidence: 77%

Ni-based catalysts for steam reforming of tar model derived from biomass gasification

et al. 2019

View full text Add to dashboard Cite

Tar formation during biomass gasification is a major barrier to utilise the produced syngas, which clogs processing equipment. In the present study, steam reforming of gasification-derived tar (phenol, toluene, naphthalene, and pyrene) was catalysed by Ni/dolomite, Ni/dolomite/Al2O3, Ni/dolomite/La2O3, Ni/dolomite/CeO2, and Ni/dolomite/ZrO2 for hydrogen production. The steam reforming experiment was conducted in a fixed bed reactor at 700 °C and the steam-to-carbon molar ratio of 1 under atmospheric pressure. After the catalytic test, the spent catalysts were characterised by thermogravimetric analysis and variable-pressure scanning electron microscope. The aim of this study is to investigate the catalytic activity of Ni-based catalysts in terms of tar conversion and their deactivation characteristic. The current results revealed that all the catalysts showed almost full conversion of tar (98.8%-99.9%) and considerably low amount of coke deposited in the form of amorphous and filamentous carbon (15.9-178.5 mg gcat-1). Among the catalysts studied, Ni/dolomite/La2O3 gave the highest catalytic activity for steam reforming of gasified biomass tar and lowest coke formation.

show abstract

“…The deactivation process is more accelerated at high temperatures (> 650 °C) and low S/C ratio, and generates olefins due to hydrocarbon pyrolysis or steam cracking reaction. It is recommended to take an S/C > 2.5 for natural gas reforming and 5–7 for naphtha . According to Coll et al.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Operational Cycles for Long‐Term Run of a Tar Removal Catalytic System

et al. 2019

View full text Add to dashboard Cite

Biomass gasification experiments on pilot/demo scales have some issues related to the early deactivation of catalysts during the tar removal step. To avoid this problem, a method was developed in a bench-scale micro activity unit using toluene as tar model compound in order to suppress this effect. The runs were performed with a commercial Pt catalyst supported on Ce-Zr-Al, alternating periods of regeneration and reactivation steps with steam, nitrogen, and hydrogen. The toluene steam reforming using operational cycles in order to reach a long-term run provided useful information for pilot plant studies, mainly reactivation and regeneration procedures. The main concern on tar removal studies by steam reforming is the catalyst deactivation due to the presence of polyaromatic and olefinic compounds on the material pores, which is produced during biomass gasification.

show abstract

Deactivation characteristics of Ni and Ru catalysts in tar steam reforming

Cited by 70 publications

References 35 publications

Reactivity and deactivation mechanisms of pyrolysis chars from bio-waste during catalytic cracking of tar

Reactivity and deactivation mechanisms of pyrolysis chars from bio-waste during catalytic cracking of tar

Ni-based catalysts for steam reforming of tar model derived from biomass gasification

Evaluation of Operational Cycles for Long‐Term Run of a Tar Removal Catalytic System

Contact Info

Product

Resources

About