scholarly journals Effect of specific surface area on syngas production performance of pure ceria in high-temperature thermochemical redox cycling coupled to methane partial oxidation

RSC Advances ◽  
2020 ◽  
Vol 10 (60) ◽  
pp. 36617-36626
Author(s):  
Manabu Heya ◽  
Xiang Gao ◽  
Antonio Tricoli ◽  
Wojciech Lipiński
Keyword(s):  
High Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Redox Reactions ◽  
Production Performance ◽  
Methane Partial Oxidation ◽  
Syngas Production ◽  
Pure Ceria ◽  
Key Parameter

Specific surface area is a key parameter determining the rates of thermochemical redox reactions in metal oxides.

scholarly journals Thermochemical CO2 splitting performance of perovskite coated porous ceramics

RSC Advances ◽  
2020 ◽  
Vol 10 (39) ◽  
pp. 23049-23057
Author(s):  
Amir Masoud Parvanian ◽  
Hamidreza Salimijazi ◽  
Mehdi Shabaninejad ◽  
Ulrike Troitzsch ◽  
Peter Kreider ◽  
...  
Keyword(s):  
High Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Redox Reactions ◽  
Structural Changes ◽  
Porous Ceramics ◽  
Representative Volume ◽  
Porous Sic

A representative volume of LCMA coated porous SiC showing a maximum of 23% shrinkage when subject to high-temperature CO2 conversion redox reactions. This results in significant structural changes including a reduction in specific surface area.

scholarly journals Syngas Production via CO2 Reforming of Methane Over SrNiO3 and CeNiO3 Perovskites

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2928
Author(s):  
Naushad Ahmad ◽  
Fahad Alharthi ◽  
Manawwer Alam ◽  
Rizwan Wahab ◽  
Salim Manoharadas ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Active Sites ◽  
Catalyst Deactivation ◽  
Dry Reforming Of Methane ◽  
Volume Number ◽  
Syngas Production

The development of a transition-metal-based catalyst with concomitant high activity and stability due to its distinguishing characteristics, yielding an abundance of active sites, is considered to be the bottleneck for the dry reforming of methane (DRM). This work presents the catalytic activity and durability of SrNiO3 and CeNiO3 perovskites for syngas production via DRM. CeNiO3 exhibits a higher specific surface area, pore volume, number of reducible species, and nickel dispersion when compared to SrNiO3. The catalytic activity results demonstrate higher CH4 (54.3%) and CO2 (64.8%) conversions for CeNiO3, compared to 22% (CH4 conversion) and 34.7% (CO2 conversion) for SrNiO3. The decrease in catalytic activity after replacing cerium with strontium is attributed to a decrease in specific surface area and pore volume, and nickel active sites covered with strontium carbonate. The stability results reveal the deactivation of both the catalysts (SrNiO3 and CeNiO3) but SrNiO3 showed more deactivation than CeNiO3, as demonstrated by deactivation factors. The catalyst deactivation is mainly attributed to carbon deposition and these findings are verified by characterizing the spent catalysts.

scholarly journals Characterization of High-Temperature Hierarchical Porous Mullite Washcoat Synthesized Using Aluminum Dross and Coal Fly Ash

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 178 ◽  
Author(s):  
Thye Foo Choo ◽  
Mohamad Amran Mohd Salleh ◽  
Kuan Ying Kok ◽  
Khamirul Amin Matori ◽  
Suraya Abdul Rashid
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Coal Fly Ash ◽  
Waste Product ◽  
Aluminum Dross ◽  
Hierarchical Porous ◽  
Porous Mullite

Mixture of aluminum dross (AD) and coal fly ash (CFA) was used to produce high-temperature porous mullite for washcoat application. CFA is the combustion by-product of pulverized coal in a coal-fired power plant, while AD is a waste product produced in secondary aluminum refining. In this study, 80 wt% of AD and 20 wt% of CFA was used to prepare a mullite precursor (MP) via acid leaching and dry-milling. The precursor was coated on a substrate and subsequently fired at 1500 °C. The results showed that the precursor transformed to a hierarchical porous microstructure assembled by large interlocked acicular mullite crystals. The pore structures consisted of large interconnected open pores and small pores. The specific surface area of the mullite washcoat was 4.85 m2g−1 after heating at 1500 °C for 4 h. The specific surface area was compatible with the specific surface area of other high-temperature washcoats.

scholarly journals Enhanced capacitive performance by improving the graphitized structure in carbon aerogel microspheres

RSC Advances ◽  
2020 ◽  
Vol 10 (37) ◽  
pp. 22242-22249
Author(s):  
Xichuan Liu ◽  
Lei Yuan ◽  
Minglong Zhong ◽  
Shuang Ni ◽  
Fan Yang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Aerogel ◽  
High Specific Surface Area ◽  
Activation Method ◽  
Carbon Aerogels ◽  
Capacitive Performance

Carbon aerogels (CAs) microspheres with good electrical conductivity and high specific surface area were synthesized by high temperature carbonization and CO2 activation method, which exhibit an enhanced capacitive performance in supercapacitors.

Microtexture, Microstructure Evolution and Thermal Insulation Performance of Carbon Aerogels with High-Temperature Treatment

2019 ◽  
Vol 11 (12) ◽  
pp. 1692-1698 ◽  
Author(s):  
Haixia Yang ◽  
Jianchun Huo ◽  
Chunming Li ◽  
Feng Ye ◽  
Jingxiao Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Thermal Insulation ◽  
Specific Surface Area ◽  
Microstructure Evolution ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Carbon Aerogels ◽  
Insulation Performance

The microtexture, microstructure evolution and thermal insulation performance of carbon aerogels subjected to high-temperature treatment were investigated in detail. The results showed that carbon aerogels derived from resorcinol-formaldehyde (RF) resin were composed of fine particles and cavities, which consisted of typical non-graphitized carbon according to X-ray diffraction analysis. The microcrystallite size (La) of the CAs increased from 4.49 nm to 6.92 nm, and the specific surface area (SBET) and the total pore volume (Vtal) decreased from 727 to 290 m2/g and from 0.963 to 0.543 cm3/g, respectively, as the temperature increased from 900 °C to 1800 °C. The micropore-specific surface area and the micropore volume decreased with increasing treatment temperature, and a small amount of macropores (>50 nm) appeared at a temperature of 1500 to 1800 °C. The carbon aerogels retained their porous structure at higher temperature, which indicated that they hold potential for application in the field of thermal insulation in high-temperature environments.

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