Dry reforming of methane over Ni/Ce0.8Ti0.2O2-δ: The effect of Ni particle size on the carbon pathways studied by transient and isotopic techniques

A Highly dispersed NiMoP phosphide catalyst with an average particle size of 9.1 nm and a carbon content of 53.5 wt% was firstly synthesized by carbothermal route using glucose as...

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The effect of Ti4+ dopant in the 5 wt% Ni/Ce1-xTixO2- catalyst on the carbon pathways of dry reforming of methane studied by various transient and isotopic techniques

Applied Catalysis A General ◽

10.1016/j.apcata.2019.04.023 ◽

2019 ◽

Vol 579 ◽

pp. 116-129 ◽

Cited By ~ 11

Author(s):

C.M. Damaskinos ◽

M.A. Vasiliades ◽

A.M. Efstathiou

Keyword(s):

Dry Reforming ◽

Dry Reforming Of Methane ◽

Carbon Pathways

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The Effect of CeO2 Preparation Method on the Carbon Pathways in the Dry Reforming of Methane on Ni/CeO2 Studied by Transient Techniques

Catalysts ◽

10.3390/catal9070621 ◽

2019 ◽

Vol 9 (7) ◽

pp. 621 ◽

Cited By ~ 6

Author(s):

Constantinos M. Damaskinos ◽

Michalis A. Vasiliades ◽

Vassilis N. Stathopoulos ◽

Angelos M. Efstathiou

Keyword(s):

Preparation Method ◽

Active Oxygen Species ◽

Sol Gel ◽

Synthesis Method ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Boudouard Reaction ◽

Transient Techniques ◽

Relative Contribution ◽

Carbon Pathways

The present work discusses the effect of CeO2 synthesis method (thermal decomposition (TD), precipitation (PT), hydrothermal (HT), and sol-gel (SG)) on the carbon pathways of dry reforming of methane with carbon dioxide (DRM) applied at 750 °C over 5 wt% Ni/CeO2. In particular, specific transient and isotopic experiments (use of 13CO, 13CO2, and 18O2) were designed and conducted in an attempt at providing insights about the effect of support’s preparation method on the concentration (mg gcat−1), reactivity towards oxygen, and transient evolution rates (μmol gcat−1 s−1) of the inactive carbon formed under (i) CH4/He (methane decomposition), (ii) CO/He (reverse Boudouard reaction), and (iii) the copresence of the two (CH4/CO/He, use of 13CO). Moreover, important information regarding the relative contribution of CH4 and CO2 activation routes towards carbon formation under DRM reaction conditions was derived by using isotopically labelled 13CO2 in the feed gas stream. Of interest was also the amount, and the transient rate, of carbon removal via the participation of support’s labile active oxygen species.

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The effect of Pt on the carbon pathways in the dry reforming of methane over Ni-Pt/Ce0.8Pr0.2O2-δ catalyst

Catalysis Today ◽

10.1016/j.cattod.2019.04.022 ◽

2020 ◽

Vol 355 ◽

pp. 788-803 ◽

Cited By ~ 6

Author(s):

M.A. Vasiliades ◽

C.M. Damaskinos ◽

K.K. Kyprianou ◽

M. Kollia ◽

A.M. Efstathiou

Keyword(s):

Dry Reforming ◽

Dry Reforming Of Methane ◽

Carbon Pathways

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Dry Reforming of Methane (DRM) by Highly Active and Stable Ni Nanoparticles on Renewable Porous Carbons

Catalysts ◽

10.3390/catal10050501 ◽

2020 ◽

Vol 10 (5) ◽

pp. 501 ◽

Cited By ~ 1

Author(s):

Yinming Li ◽

Zhaojia Wang ◽

Bo Zhang ◽

Zhengang Liu ◽

Tianxue Yang

Keyword(s):

Particle Size ◽

Conversion Efficiency ◽

Nickel Particle ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Narrow Particle Size Distribution ◽

Ni Nanoparticles ◽

Porous Carbons ◽

Highly Active ◽

Green Approach

In this study, Ni nanoparticles supported on renewable porous carbon were prepared using hydrochar as a carbon precursor via in situ formation and self-reduction. The structure properties of the prepared nanocatalysts were characterized by multiple techniques, including XRD, SEM, and HR-TEM, and the dry reforming of methane (DRM) performance of the nanocatalysts in terms of conversion efficiency and reactivity stability was evaluated. The results revealed that the Ni2+ was uniformly anchored on the surface of the hydrochar, and subsequently the Ni nanoparticles were well dispersed in the composite with a diameter of less than 8 nm and had a narrow particle size distribution at a temperature lower than 800 °C. With an increased temperature from 800 to 900 °C, the significant sintering and agglomeration of nickel particles and the transformation from amorphous carbon to graphitic structure were observed in the composite. The nanocatalysts prepared at a temperature of 700 °C (Ni@C-700) and 800 °C (Ni@C-800) exhibited a high reforming conversion rate and catalytic stability of CH4 by CO2 (around 52% for Ni@C-700 and 70% for Ni@C-800 after 800 min of run-time, respectively). As for the composite obtained at 900 (Ni@C-900), the highly graphitic degree was coupled with the significantly increased nickel particle size, and this resulted in a remarkably decreased conversion efficiency. The present study offers a valuable application of the hydrochar and a facile and green approach to prepare highly active and cost-efficient Ni nanoparticles on porous carbons towards the dry reforming of methane.

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