Effect of pore texture property of mesoporous alumina on adsorption performance of ammonia gas

2020 ◽  
Vol 91 ◽  
pp. 129-138
Author(s):  
Huyen Thanh Vo ◽  
Jiyull Kim ◽  
Na Yeon Kim ◽  
Jung-Kul Lee ◽  
Ji Bong Joo
Keyword(s):  
Mesoporous Alumina ◽  
Ammonia Gas ◽  
Adsorption Performance ◽  
Pore Texture ◽  
Texture Property

scholarly journals Amino organosilane grafted ordered mesoporous alumina with enhanced adsorption performance towards Cr(vi)

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53076-53086 ◽  
Author(s):  
Xin Jin ◽  
Weiquan Cai ◽  
Zhijun Cai
Keyword(s):  
Mesoporous Alumina ◽  
Adsorption Performance ◽  
Ordered Mesoporous ◽  
Ordered Mesoporous Alumina ◽  
Enhanced Adsorption

Amino organosilane N-(β-aminoethyl)-γ-aminopropylmethylbimethoxysilane (2N) functionalized ordered mesoporous aluminas (MA–2N) with enhanced adsorption performance towards Cr(vi) were successfully prepare by a facile grafting method.

scholarly journals Mesoporous Alumina Microfibers In Situ Transformation from AACH Fibers and the Adsorption Performance

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Xiaoqin Shi ◽  
Chen Yang ◽  
Liang Zhang ◽  
Zhongding Lu ◽  
Yun Zhu ◽  
...  
Keyword(s):  
High Surface ◽  
Mesoporous Alumina ◽  
Adsorption Ability ◽  
Adsorption Performance ◽  
Carbonate Hydroxide ◽  
Vis Spectroscopy ◽  
Adsorptive Properties ◽  
Mesoporous Structures ◽  
Better Than

Well-dispersed mesoporousγ-alumina microfibers with high surface were prepared by thermal decomposition of the ammonium aluminum carbonate hydroxide (AACH) precursors. The as-synthesized alumina retained the morphology of its precursor and exhibited memory effect. The structural, morphological, porous, and adsorptive properties of the samples were investigated by XRD, FTIR, TGA-DSC, SEM, TEM, and UV-vis spectroscopy. The preparedγ-alumina microfibers exhibited excellent ability to remove organic pollutants from waste water because of their mesoporous structures. Theγ-alumina in situ converted from AACH synthesized without surfactant exhibited adsorption ability for Congo red as good as that synthesized with PEG2000 and better than PEG20000 that provided a facile method without surfactant to synthesizeγ-alumina with excellent adsorption performance.

Synthesis and characterization of mesoporous alumina, and adsorption performance for n-butane

2013 ◽  
Vol 41 (6) ◽  
pp. 3637-3648 ◽  
Author(s):  
Ling Zhu ◽  
Xiaoyang Zhang ◽  
Lingling Zhu ◽  
Xinyue Li ◽  
Lingshuo Meng
Keyword(s):  
Mesoporous Alumina ◽  
Synthesis And Characterization ◽  
Adsorption Performance

scholarly journals Study on the Synthesis of High-Purity γ-Phase Mesoporous Alumina with Excellent CO2 Adsorption Performance via a Simple Method Using Industrial Aluminum Oxide as Raw Material

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5465
Author(s):  
Zhonglin Li ◽  
Ding Wang ◽  
Jialong Shen ◽  
Junxue Chen ◽  
Chengzhi Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
High Purity ◽  
Density Functional ◽  
Co2 Adsorption ◽  
Mesoporous Alumina ◽  
Raw Material ◽  
Simple Method ◽  
X Ray ◽  
Adsorption Performance

To mitigate the global greenhouse effect and the waste of carbon dioxide, a chemical raw material, high-purity γ-phase mesoporous alumina (MA) with excellent CO2 adsorption performance was synthesized by the direct aging method and ammonium salt substitution method. With this process, not only can energy consumption and time be shortened to a large extent but the final waste can also be recycled to the mother liquor by adding calcium hydroxide. Reaction conditions, i.e., pH value, aging time, calcination temperature, and desodium agent, were investigated in detail with the aid of X-ray fluorescence spectrum (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) and Barret-Joyner-Hallender (BJH) methods, nonlocal density functional theory (NLDFT), transmission electron microscopy (TEM), temperature-programmed desorption of CO2 (CO2-TPD), and presented CO2 adsorption measurement. The results of this study are summarized as follows: the impurity content of the MA synthesized under optimal conditions is less than 0.01%, and its total removal rate of impurities is 99.299%. It was found that the MA adsorbent has a large specific surface area of 377.8 m2/g, pore volume of 0.55 cm3/g, and its average pore diameter is 3.1 nm. Under the condition of a gas flow rate of 20 cm3/min, its CO2 adsorption capacity is 1.58 mmol/g, and after 8 times of cyclic adsorption, the amount of CO2 adsorption remained basically unchanged, both of which indicate that the material has excellent adsorption properties and can be widely used for the adsorption of carbon dioxide.

Anisotropic Membranes as Substrates for Sem

1976 ◽  
Vol 34 ◽  
pp. 444-445
Author(s):  
Thomas P. Turnbull ◽  
W. F. Bowers
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Flow ◽  
Polymer Chemistry ◽  
Surface Porosity ◽  
Transmission Electron ◽  
Pore Texture ◽  
Spongy Layer ◽  
Scanning Electron

Until recently the prime purposes of filters have been to produce clear filtrates or to collect particles from solution and then remove the filter medium and examine the particles by transmission electron microscopy. These filters have not had the best characteristics for scanning electron microscopy due to the size of the pores or the surface topography. Advances in polymer chemistry and membrane technology resulted in membranes whose characteristics make them versatile substrates for many scanning electron microscope applications. These polysulphone type membranes are anisotropic, consisting of a very thin (0.1 to 1.5 μm) dense skin of extremely fine, controlled pore texture upon a much thicker (50 to 250μm), spongy layer of the same polymer. Apparent pore diameters can be controlled in the range of 10 to 40 A. The high flow ultrafilters which we are describing have a surface porosity in the range of 15 to 25 angstrom units (0.0015-0.0025μm).

Microscopy of porous ceramics

1989 ◽  
Vol 47 ◽  
pp. 438-439
Author(s):  
H. M. Kerch ◽  
R. A. Gerhardt
Keyword(s):  
Porous Ceramics ◽  
Specimen Preparation ◽  
High Porosity ◽  
Ion Milling ◽  
Forming Process ◽  
Preparation Methods ◽  
Pore Texture ◽  
Proper Design ◽  
And Function ◽  
Function Information

Highly porous ceramics are employed in a variety of engineering applications due to their unique mechanical, optical, and electrical characteristics. In order to achieve proper design and function, information about the pore structure must be obtained. Parameters of importance include pore size, pore volume, and size distribution, as well as pore texture and geometry. A quantitative determination of these features for high porosity materials by a microscopic technique is usually not done because artifacts introduced by either the sample preparation method or the image forming process of the microscope make interpretation difficult.Scanning electron microscopy for both fractured and polished surfaces has been utilized extensively for examining pore structures. However, there is uncertainty in distinguishing between topography and pores for the fractured specimen and sample pullout obscures the true morphology for samples that are polished. In addition, very small pores (nm range) cannot be resolved in the S.E.M. On the other hand, T.E.M. has better resolution but the specimen preparation methods involved such as powder dispersion, ion milling, and chemical etching may incur problems ranging from preferential widening of pores to partial or complete destruction of the pore network.

Synthesis of Polyaniline-Zinc Oxide Composites and Its Usage as Ammonia Gas Sensor

2014 ◽  
Vol 1 (4) ◽  
pp. 16-19
Author(s):  
Vivek Talwar ◽  
◽  
Ravi Chand Singh ◽  
Keyword(s):  
Zinc Oxide ◽  
Gas Sensor ◽  
Ammonia Gas ◽  
Oxide Composites

NITRALLOY 125

Alloy Digest ◽  
1957 ◽  
Vol 6 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Low Temperatures ◽  
Heat Treating ◽  
Ammonia Gas ◽  
Steel Mills ◽  
Special Alloy

Abstract NITRALLOY 125 (0.20-0.30% C) is a special alloy steel which can be nitrided, that is, surface hardened, without final quenching, by the action of ammonia gas at relatively low temperatures. Nitralloy 125 is also known as Nitralloy H. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-61. Producer or source: Alloy steel mills and foundries.

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