scholarly journals Rational Design of High Surface Area Mesoporous Ni/CeO2 for Partial Oxidation of Propane

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 388 ◽  
Author(s):  
Mohammad Peymani ◽  
Seyed Alavi ◽  
Hamidreza Arandiyan ◽  
Mehran Rezaei
Keyword(s):  
Surface Area ◽  
Partial Oxidation ◽  
Active Sites ◽  
Rational Design ◽  
High Surface ◽  
High Surface Area ◽  
High Dispersion ◽  
Propane Conversion ◽  
Impregnation Method ◽  
Efficient Catalyst

A Ni loaded catalyst on mesoporous ceria, with a large surface area, prepared through the surfactant-assisted precipitation and impregnation method was investigated as an efficient catalyst for propane partial oxidation to produce synthesis gas. The results show that 2.5 wt% Ni/CeO2 had the optimum Ni loading, exhibiting the highest catalytic propane conversion. It also showed excellent stability, with no obvious activity drop after a 10 h time-on-stream reaction and slightly decreased in H2 and CO yields. The investigation of the reactant composition effect on carbon formation showed that by decreasing the C/O2 ratio the content of accumulated carbon decreased and propane conversion increased. The good activity of the Ni/CeO2 can be ascribed to the high surface area and rich surface defects of the ceria support and a high dispersion of active sites (Ni nanoparticles).

scholarly journals Bifunctional Materials for CO₂ Adsorption: Short Review

2021 ◽  
Vol 7 (2) ◽  
pp. 15-19
Author(s):  
S. M. Yusof ◽  
L. P. Teh
Keyword(s):  
Surface Area ◽  
Active Sites ◽  
Co2 Adsorption ◽  
High Surface ◽  
Co Adsorption ◽  
High Surface Area ◽  
Short Review ◽  
High Dispersion ◽  
High Porosity ◽  
Adsorption Performance

In recent years, there has been growing interest in adsorbents with high surface area, high porosity, high stability and high selectivity for CO2 adsorption. By the incorporation of the additive on the supports such as zeolite, silica, and carbon, the physicochemical properties of the adsorbent and CO2 adsorption performance can be enhanced. In this review, we focus on the overview of bifunctional materials (BFMs) for CO2 adsorption. The findings of this study suggests that the high surface area and high porosity of the support provide a good medium for high dispersion and accessibility of additives (amine or metal oxide), enhancing the CO2 adsorption efficiency. The excessive additive however may lead to a decrease of CO2 adsorption performance due to pore blockage and the decrease of active sites for CO2 interactions. The synergistic relationship of the supporting material and additive is significant towards the enhancement of CO2 adsorption.

Spidery catalyst for the synthesis of quinazoline-2,4(1H,3H)-diones

2016 ◽  
Vol 6 (5) ◽  
pp. 1435-1441 ◽  
Author(s):  
Seyed Mohsen Sadeghzadeh
Keyword(s):  
Surface Area ◽  
Active Sites ◽  
High Surface ◽  
High Surface Area

In this study, a novel fibrous nanosilica (KCC-1) based nanocatalyst (Au, Pd, and Cu) with a high surface area and easy accessibility of active sites was successfully developed by a facile approach.

scholarly journals Catalytic Cracking of n-Hexadecane Using Carbon Nanostructures/Nano-Zeolite-Y Composite Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1385
Author(s):  
Botagoz Zhuman ◽  
Shaheen Fatima Anis ◽  
Saepurahman ◽  
Gnanapragasam Singravel ◽  
Raed Hashaikeh
Keyword(s):  
Surface Area ◽  
Catalytic Cracking ◽  
Carbon Nanostructures ◽  
Active Sites ◽  
Zeolite Y ◽  
High Surface ◽  
High Surface Area ◽  
Composite Catalyst ◽  
Homogeneous Distribution ◽  
Binding Material

Zeolite-based catalysts are usually utilized in the form of a composite with binders, such as alumina, silica, clay, and others. However, these binders are usually known to block the accessibility of the active sites in zeolites, leading to a decreased effective surface area and agglomeration of zeolite particles. The aim of this work is to utilize carbon nanostructures (CNS) as a binding material for nano-zeolite-Y particles. The unique properties of CNS, such as its high surface area, thermal stability, and flexibility of its fibrous structure, makes it a promising material to hold and bind the nano-zeolite particles, yet with a contemporaneous accessibility of the reactants to the porous zeolite structure. In the current study, a nano-zeolite-Y/CNS composite catalyst was fabricated through a ball milling approach. The catalyst possesses a high surface area of 834 m2/g, which is significantly higher than the conventional commercial cracking catalysts. Using CNS as a binding material provided homogeneous distribution of the zeolite nanoparticles with high accessibility to the active sites and good mechanical stability. In addition, CNS was found to be an effective binding material for nano-zeolite particles, solving their major drawback of agglomeration. The nano-zeolite-Y/CNS composite showed 80% conversion for hexadecane catalytic cracking into valuable olefins and hydrogen gas, which was 14% higher compared to that of pure nano-zeolite-Y particles.

scholarly journals Ultrasonic-assisted preparation of highly active Co3O4/MCM-41 adsorbent and its desulfurization performance for low H2S concentration gas

RSC Advances ◽  
2020 ◽  
Vol 10 (50) ◽  
pp. 30214-30222
Author(s):  
Bolong Jiang ◽  
Jiaojing Zhang ◽  
Yanguang Chen ◽  
Hua Song ◽  
Tianzhen Hao ◽  
...  
Keyword(s):  
Surface Area ◽  
Active Sites ◽  
High Surface ◽  
High Surface Area ◽  
Highly Active ◽  
Ultrasonic Assisted ◽  
Sulfur Capacity ◽  
Mcm 41

Co3O4/MCM-41 adsorbent with high surface area and more active sites was successfully prepared by ultrasonic assisted impregnation (UAI) technology and it has been found that the sulfur capacity was improved by 33.2% because of ultrasonication.

Large-scale and facile synthesis of a porous high-entropy alloy CrMnFeCoNi as an efficient catalyst

2020 ◽  
Vol 8 (35) ◽  
pp. 18318-18326 ◽  
Author(s):  
Hailong Peng ◽  
Yangcenzi Xie ◽  
Zicheng Xie ◽  
Yunfeng Wu ◽  
Wenkun Zhu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Large Scale ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
High Entropy Alloy ◽  
Facile Synthesis ◽  
Efficient Catalyst ◽  
High Entropy

Porous high entropy alloy CrMnFeCoNi exhibited remarkable catalytic activity and stability toward p-nitrophenol hydrogenation. The enhanced catalytic performance not only resulted from the high surface area, but also from exposed high-index facets with terraces.

Ruthenium Supported on High-Surface-Area Zirconia as an Efficient Catalyst for the Base-Free Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid

ChemSusChem ◽  
2018 ◽  
Vol 11 (13) ◽  
pp. 2083-2090 ◽  
Author(s):  
Christian M. Pichler ◽  
Mohammad G. Al-Shaal ◽  
Dong Gu ◽  
Hrishikesh Joshi ◽  
Wirawan Ciptonugroho ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Efficient Catalyst ◽  
Furandicarboxylic Acid ◽  
Free Oxidation

scholarly journals Multifunctional and Environmentally Friendly TiO2–SiO2 Mesoporous Materials for Sustainable Green Buildings

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4226
Author(s):  
Ghedini ◽  
Menegazzo ◽  
Manzoli ◽  
Di Michele ◽  
Puglia ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Environmentally Friendly ◽  
Green Building ◽  
Structural Features ◽  
Modulated Dsc ◽  
Synthetic Approach ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method

This work deals with the formulation of environmentally friendly, cheap, and readily-available materials for green building applications, providing the function of air purificator by improving the safety and the comfort of an indoor environment. High surface area TiO2–SiO2 samples, prepared by a simple, cost effective, and scalable synthetic approach, proved to be effective in maximizing the properties of each component, i.e., the photocatalytic properties of titania and the high surface area of silica. TiO2 was introduced onto an ordered mesoporous silica Santa Barbara Amorphous-15 (SBA-15), that is featured by interesting insulating features, by using an incipient wetness impregnation method. The photocatalytic activity was evaluated in gas phase oxidation of ethylbenzene, which was selected as model volatile organic compound (VOC) molecule. The morphological, textural and structural features along with the electronic properties, the hydrophilicity and heat capacity of the materials were investigated in depth by scanning electron microscopy, powder X-ray diffraction, N2 physisorption, diffuse reflectance UV-Vis, FT-IR spectroscopies, and modulated DSC (MDSC) dynamic scan. Outstanding performances in the ethylbenzene abatement results are promising for further application in the green building sector.

Fabrication of Mn2O3 nanorods: an efficient catalyst for selective transformation of alcohols to aldehydes

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 33923-33929 ◽  
Author(s):  
Hasimur Rahaman ◽  
Radha M. Laha ◽  
Dilip K. Maiti ◽  
Sujit Kumar Ghosh
Keyword(s):  
Surface Area ◽  
Catalytic Property ◽  
High Surface ◽  
High Surface Area ◽  
Efficient Catalyst ◽  
Selective Transformation ◽  
Self Assembled ◽  
Polymer Surfactant

Self-assembled high surface area Mn2O3 nanorods have been fabricated through an effective polymer–surfactant interaction and their outstanding catalytic property for the selective transformation of alcohols to aldehydes has been discovered.

A porous Brønsted superacid as an efficient and durable solid catalyst

2018 ◽  
Vol 6 (38) ◽  
pp. 18712-18719 ◽  
Author(s):  
Qi Sun ◽  
Kewei Hu ◽  
Kunyue Leng ◽  
Xianfeng Yi ◽  
Briana Aguila ◽  
...  
Keyword(s):  
Surface Area ◽  
Active Sites ◽  
High Surface ◽  
High Surface Area ◽  
Solid Catalyst ◽  
Chemical Transformations ◽  
Catalytic Activities ◽  
Industrial Chemical

A porous superacid material with a high surface area and abundant accessible active sites is rationally designed, showing outstanding catalytic activities and durability in industrial chemical transformations.

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