CO2reforming of methane over highly active La-promoted Ni supported on SBA-15 catalysts: mechanism and kinetic modelling

2016 ◽  
Vol 6 (4) ◽  
pp. 1173-1186 ◽  
Author(s):  
U. Oemar ◽  
Y. Kathiraser ◽  
L. Mo ◽  
X. K. Ho ◽  
S. Kawi
Keyword(s):  
Oleic Acid ◽  
Basic Property ◽  
Preparation Method ◽  
Kinetic Modelling ◽  
High Surface ◽  
High Surface Area ◽  
Ni Catalysts ◽  
Highly Active ◽  
Highly Dispersed ◽  
Acid Precursor

Various Ni catalysts were synthesized by combining a high surface area SBA-15 support, a novel preparation method using an oleic acid precursor to obtain highly dispersed and small Ni particles, and the basic property of La.

scholarly journals Hierarchical HZSM-5 for Catalytic Cracking of Oleic Acid to Biofuels

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 747
Author(s):  
Mahashanon Arumugam ◽  
Chee Keong Goh ◽  
Zulkarnain Zainal ◽  
Sugeng Triwahyono ◽  
Adam F. Lee ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Solid Acid ◽  
High Surface ◽  
High Surface Area ◽  
Acid Catalyst ◽  
Hierarchical Network ◽  
Waste Oil ◽  
Acid Catalyzed ◽  
Zeolite Seeds ◽  
20 Nm

Solid acid catalyzed cracking of waste oil-derived fatty acids is an attractive route to hydrocarbon fuels. HZSM-5 is an effective acid catalyst for fatty acid cracking; however, its microporous nature is susceptible to rapid deactivation by coking. We report the synthesis and application of hierarchical HZSM-5 (h-HZSM-5) in which silanization of pre-crystallized zeolite seeds is employed to introduce mesoporosity during the aggregation of growing crystallites. The resulting h-HZSM-5 comprises a disordered array of fused 10–20 nm crystallites and mesopores with a mean diameter of 13 nm, which maintain the high surface area and acidity of a conventional HZSM-5. Mesopores increase the yield of diesel range hydrocarbons obtained from oleic acid deoxygenation from ~20% to 65%, attributed to improved acid site accessibility within the hierarchical network.

Highly active mixed-valent MnOxspheres constructed by nanocrystals as efficient catalysts for long-cycle Li–O2batteries

2016 ◽  
Vol 4 (43) ◽  
pp. 17129-17137 ◽  
Author(s):  
Sanpei Zhang ◽  
Zhaoyin Wen ◽  
Yang Lu ◽  
Xiangwei Wu ◽  
Jianhua Yang
Keyword(s):  
Surface Area ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Long Cycle ◽  
Highly Active

We demonstrate a low-cost and facile strategy to synthesize mixed-valent MnOxspheres constructed from nanocrystals (~5 nm), containing MnII, MnIII, and MnIVspecies. Such highly active mixed-valent MnOxspheres with high surface area greatly improve the performance of Li–O2batteries.

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.

A new preparation method for nano-sized Ce–Zr–Ba mixed oxide with high surface area

2004 ◽  
Vol 93-95 ◽  
pp. 671-674 ◽  
Author(s):  
Min Chen ◽  
Peizhuang Zhang ◽  
Xiaoming Zheng
Keyword(s):  
Surface Area ◽  
Mixed Oxide ◽  
Preparation Method ◽  
High Surface ◽  
High Surface Area

Ordered mesoporous silica cubic particles decorated with silver nanoparticles: a highly active and recyclable heterogeneous catalyst for the reduction of 4-nitrophenol

2019 ◽  
Vol 48 (8) ◽  
pp. 2692-2700 ◽  
Author(s):  
Hui-Tao Fan ◽  
Xue-Guo Liu ◽  
Xiao-Jing Xing ◽  
Bo Li ◽  
Kun Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Potential Application ◽  
High Surface ◽  
High Surface Area ◽  
Ordered Mesoporous Silica ◽  
Highly Active ◽  
Ordered Mesoporous ◽  
Recyclable Heterogeneous Catalyst

An Ag–OMS-C nanocomposite with a high surface area was proposed, and its potential application for catalytic activity was highlighted.

scholarly journals Comparison of physicochemical properties and selective catalytic reduction activities of CeMn/TiO2 catalysts with and without phosphorus additives

2021 ◽  
Author(s):  
Zeycan KESKİN
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Catalyst Activity ◽  
High Surface ◽  
High Surface Area ◽  
Phosphorus Loading ◽  
X Ray Diffraction ◽  
Reduction Activity ◽  
Highly Active ◽  
Loading Amount

Abstract Lubricant additives contain phosphorus, which has a fly ash effect. Phosphorus negatively affects catalyst activity. Determining the effects of phosphorus loading amount on the catalytic activity is important for the development of catalysts with high NOx reduction. This study focuses on the control of NOx emissions, one of the air pollutants released from the diesel engine. The catalysts used in the reduction of NOx emissions were synthesized by washcoating method. Ce and Mn contents of all catalysts were adjusted as 3%, while the phosphorus contents of poisoned catalysts were adjusted as 0.5% and 1%. For this purpose, cordierite with high surface area was used. The catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Brunauer-Emmett-Teller (BET), X-Ray diffraction (XRD) and ultraviolet visible spectroscopy (UV-Vis) analyzes. The NOx reduction activity of with and without phosphorus doped CeMn/TiO2 catalysts was investigated with the designed selective catalytic reduction system (SCR). NOx conversion ratios of the CeMn/TiO2 catalyst reached the high values of 84.6% at 280°C. After the phosphorus loading, the structure of the CeMn/TiO2 catalyst deteriorated, and the NOx conversion ratios decreased. 0.5P-CeMn/TiO2 and 1P-CeMn/TiO2 catalysts showed lower NOx conversion ratios compared to CeMn/TiO2 catalyst. CeMn-TiO2 catalyst was found highly active for SCR at all tests. Phosphorus loading caused deactivation of the catalyst and deactivation increased due to the increase in phosphorus loading amount.

Highly Active TiO2-MoS2 Composite for Visible Light Photocatalytic Applications

2015 ◽  
Vol 830-831 ◽  
pp. 553-556 ◽  
Author(s):  
S.M.Y. Mohamed Mukthar Ali ◽  
K.Y. Sandhya
Keyword(s):  
Visible Light ◽  
High Surface ◽  
High Surface Area ◽  
Titanium Isopropoxide ◽  
Solvent Mixture ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Highly Active ◽  
Visible Light Active ◽  
Light Absorbance

Efficient visible light active TiO2-Molybdenum sulphide (TiO2-MoS2) composites were prepared by solvothermal methodfrom titanium isopropoxide and commercial MoS2 using N-methyl 2-pyrrolidone (NMP) and isopropanol (IPA) solvent mixture. Extended absorption band edge and enhanced visible light absorbance are supplemented intothe TiO2-MoS2 composites by this method. While TiO2 shows ~48% visible light photodegradation of rhodamine B (RhB) the TiO2-MoS2(0.24) exhibits~74% of degradation. In addition to the visible light enhancement, very high surface area and reduced charge transfer resistance at the interfaces are attributed to the enhanced activity of the composite.

Palladium catalysts supported on carbon–nitrogen composites for aqueous-phase hydrogenation of phenol

2015 ◽  
Vol 5 (4) ◽  
pp. 2300-2304 ◽  
Author(s):  
Gang Feng ◽  
Ping Chen ◽  
Hui Lou
Keyword(s):  
Surface Area ◽  
Aqueous Phase ◽  
Palladium Catalysts ◽  
High Surface ◽  
High Surface Area ◽  
Supported Palladium Catalysts ◽  
Highly Active ◽  
Supported Palladium

Supported palladium catalysts on carbon-nitrogen composites with high surface area are highly active for aqueous-phase hydrogenation of phenol.

Copper nanoparticles decorated polyaniline–zeolite nanocomposite for the nanomolar simultaneous detection of hydrazine and phenylhydrazine

2016 ◽  
Vol 6 (4) ◽  
pp. 1134-1145 ◽  
Author(s):  
Balwinder Kaur ◽  
Rajendra Srivastava ◽  
Biswarup Satpati
Keyword(s):  
Surface Area ◽  
Copper Nanoparticles ◽  
Electrocatalytic Activity ◽  
High Surface ◽  
High Surface Area ◽  
Simultaneous Detection ◽  
Pani Film ◽  
Highly Dispersed

The high electrocatalytic activity of the CuNPs–PANI–Nano-ZSM-5 nanocomposite can be attributed to the synergistic contribution provided by the highly dispersed copper nanoparticles and conductive PANI film on high surface area Nano-ZSM-5.

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