Importance of the specific surface area of the catalyst in oxidative dimerization of methane over promoted magnesium oxide

1987 ◽  
pp. 19 ◽  
Author(s):  
Eiji Iwamatsu ◽  
Takeshi Moriyama ◽  
Nobuhiro Takasaki ◽  
Ken-ichi Aika
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Magnesium Oxide ◽  
Specific Surface Area ◽  
Oxidative Dimerization ◽  
Oxidative Dimerization Of Methane

Preparation and Structural Analysis of Magnesium Oxide Aerogels

MRS Advances ◽  
2017 ◽  
Vol 2 (57) ◽  
pp. 3505-3510
Author(s):  
Jiankai Zhang ◽  
Xiaohong Chen ◽  
Ran Liu ◽  
Huaihe Song ◽  
Zhihong Li
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Magnesium Oxide ◽  
Specific Surface Area ◽  
Average Pore Size ◽  
Sol Gel ◽  
Average Pore ◽  
X Ray ◽  
Water As Solvent ◽  
Saxs Analysis

ABSTRACTMagnesium oxide aerogels were made by sol-gel process using magnesium methoxide as precursor, methanol and deionized water as solvent with ethanol supercritical fluid drying. The influences of the different factors on the gel time and the specific surface area of magnesium oxide aerogels were studied, and the structure and morphology were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and X-ray diffraction (XRD), and the Small Angle X-ray Scatter (SAXS) was utilized to determine the fractural structure of the magnesium oxide aerogels. The results show that MgO aerogels belong to the typical mesoporous materials with rich network and highly developed pore structure, and the specific surface area is 904.9 m2/g, the apparent density is 0.055 g/cm3, the average pore size is 19.6 nm. The results of SAXS analysis show that the fractal dimension of the MgO aerogels is 2.32 in high q area which proves the existence of rough surface and pore fractal structure.

A Study on the Influencing Factors on the Dry-Shrinkage Performance of Phosphate Cement

2011 ◽  
Vol 99-100 ◽  
pp. 838-841
Author(s):  
Chun Ping Tang
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Surface Area ◽  
Magnesium Oxide ◽  
Influencing Factors ◽  
Specific Surface Area ◽  
Specific Area ◽  
Dry Shrinkage

Aiming at the characteristics of phosphate repairing materials, the influences of retarder, specific surface area of magnesium oxide and content of fly ash on the dry-shrinkage performance of phosphate cement were studied in this paper. The results showed that greater content of retarder would result in greater dry-shrinkage value within a certain range, greater specific area of magnesium oxide would result in greater dry-shrinkage value while the increase of content of fly ash would cause the dry-shrinkage value to be decreased correspondingly within a certain range.

scholarly journals Aerogel nanoscale magnesium oxides as a destructive sorbent for toxic chemical agents

2004 ◽  
Vol 2 (1) ◽  
Author(s):  
Vaclav Štengl ◽  
Snejana Bakardjieva ◽  
Monika Maříková ◽  
Jan Šubrt ◽  
František Opluštil ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Magnesium Oxide ◽  
Specific Surface Area ◽  
Experimental Evaluation ◽  
Toxic Chemical ◽  
Chemical Agents

AbstractAn autoclave hypercritical drying procedure has been used to prepare precursors of MgO from Mg(OCH3)2. This material was prepared with a specific surface area of 1200 m2 g 1. The dehydrated materials consisted of much smaller crystallites than conventionally prepared MgO and were free of OCH3 groups. The precursors and samples of magnesium oxide were taken for experimental evaluation of their reactivity with mustard. The largest percentage of the conversion mustard into non-toxic products after the elapse of the reaction was 77%.

scholarly journals Synthesis of Magnesium Oxide Nanoplates and Their Application in Nitrogen Dioxide and Sulfur Dioxide Adsorption

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Thi Hai Yen Duong ◽  
Thanh Nhan Nguyen ◽  
Ho Thi Oanh ◽  
Tuyet Anh Dang Thi ◽  
Le Nhat Thuy Giang ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Nitrogen Dioxide ◽  
Specific Surface ◽  
Surface Area ◽  
Magnesium Oxide ◽  
Specific Surface Area ◽  
Sol Gel ◽  
Sodium Dodecyl ◽  
Gas Treatment ◽  
Calcination Method

In this research, nanostructured magnesium oxide was synthesized through the sol-gel calcination or hydrothermal calcination method using various surfactants. The X-ray diffraction pattern of the materials confirmed that all the prepared magnesium oxide samples were single phase without any impurity. The scanning electron microscopy images and specific surface area values showed that sodium dodecyl sulfate was the most suitable surfactant for the synthesis of magnesium oxide nanoplates with the diameter of 40–60 nm, the average thickness of 5 nm, and a specific surface area of 126 m2/g. This material was utilized for nitrogen dioxide and sulfur dioxide adsorption under ambient condition. The saturated adsorption capacities of magnesium oxide were 174 mg/g for nitrogen dioxide and 160 mg/g for sulfur dioxide, making the magnesium oxide nanoplates a promising candidate for toxic gas treatment.

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