scholarly journals A Nanomesoporous Catalyst from Modified Red Mud and Its Application for Methane Decomposition to Hydrogen Production

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaoke Fang ◽  
Quanrun Liu ◽  
Peng Li ◽  
Haipeng Li ◽  
Fenghai Li ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Red Mud ◽  
Chemical Structure ◽  
Catalytic Performance ◽  
Methane Decomposition ◽  
Size Distributions ◽  
Nanoscale Particles ◽  
Modification Process ◽  
Pore Size Distributions ◽  
Physical And Chemical

A type of nanomesoporous modified red mud (MRM) catalyst was prepared and utilized for catalytic methane decomposition (CMD) to produce hydrogen. The modification process significantly simplified the mineral composition of the red mud (RM); in the meantime, the physical and chemical structure of RM was changed. TEM images suggested that MRM was a kind of nanomesoporous material assembled by a number of uniformly nanoscale particles, BET results showed that the pore size distributions of MRM were ranged from 3 to 12 nm, and the specific surface area and total pore volumes of red mud improved from 8.00 m2/g and 0.08 cm3/g to 190.61 m2/g and 0.39 cm3/g, respectively. The catalytic performance of the catalysts has been tested at 800°C; the results showed that MRM exhibited much higher activity and stability than RM for CMD.

Thermocatalytic decomposition of methane on carbon materials and its application in hydrogen production technologies

2021 ◽  
Vol 1 (1-2) ◽  
pp. 47-54
Author(s):  
A. R. Osipov ◽  
I. A. Sidorchik ◽  
D. A. Shlyapin ◽  
V. A. Borisov ◽  
N. N. Leontieva ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Carbon Materials ◽  
Chemical Properties ◽  
Methane Decomposition ◽  
Low Carbon ◽  
Low Carbon Economy ◽  
Production Of Hydrogen ◽  
Production Technologies ◽  
Carbon Catalysts ◽  
Physical And Chemical

It is topical now to find the ways of hydrogen production that would eliminate emission of carbon oxides into the atmosphere and provide implementation of the so-called low-carbon economy. The production of hydrogen via thermocatalytic methane decomposition (CMD) on carbon catalysts makes it possible to obtain not only a valuable environmentally friendly fuel represented by hydrogen but also various carbon materials that could be applied in different industries. The use of carbon catalysts is essential for economic efficiency of the methane decomposition process. This work is a review of CMD fundamentals and a brief report on the catalytic activity of carbon materials (activated carbon, carbon black, nanotubes and nanofibers) differing in their structure, physical and chemical properties, which were studied in the indicated process. The main problems and prospects for application of this technology were revealed.

Effect of combining Al, Mg, Ce or La oxides to extracted rice husk nanosilica on the catalytic performance of NiO during COx-free hydrogen production via methane decomposition

2017 ◽  
Vol 42 (15) ◽  
pp. 9858-9872 ◽  
Author(s):  
Ahmed E. Awadallah ◽  
Sanaa M. Solyman ◽  
Ateyya A. Aboul-Enein ◽  
Hanan A. Ahmed ◽  
Noha A.K. Aboul-Gheit ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Rice Husk ◽  
Catalytic Performance ◽  
Methane Decomposition ◽  
Free Hydrogen

CHARACTERIZATION OF PORE SIZE DISTRIBUTIONS USING NON-NEWTONIAN FLUIDS

2020 ◽  
Author(s):  
Scott C. Hauswirth ◽  
◽  
Majdi Abou Najm ◽  
Christelle Basset
Keyword(s):  
Pore Size ◽  
Newtonian Fluids ◽  
Size Distributions ◽  
Pore Size Distributions

scholarly journals Effects of Various Types of Expandable Graphite and Blackcurrant Pomace on the Properties of Viscoelastic Polyurethane Foams

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1801
Author(s):  
Rafał Oliwa ◽  
Joanna Ryszkowska ◽  
Mariusz Oleksy ◽  
Monika Auguścik-Królikowska ◽  
Małgorzata Gzik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Oxygen Index ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Ftir Analysis ◽  
Limiting Oxygen Index ◽  
Peak Heat Release Rate ◽  
Physical And Chemical ◽  
Scanning Electron

We investigated the effect of the type and amount of expandable graphite (EG) and blackcurrant pomace (BCP) on the flammability, thermal stability, mechanical properties, physical, and chemical structure of viscoelastic polyurethane foams (VEF). For this purpose, the polyurethane foams containing EG, BCP, and EG with BCP were obtained. The content of EG varied in the range of 3–15 per hundred polyols (php), while the BCP content was 30 php. Based on the obtained results, it was found that the additional introduction of BCPs into EG-containing composites allows for an additive effect in improving the functional properties of viscoelastic polyurethane foams. As a result, the composite containing 30 php of BCP and 15 php of EG with the largest particle size and expanded volume shows the largest change in the studied parameters (hardness (H) = 2.65 kPa (+16.2%), limiting oxygen index (LOI) = 26% (+44.4%), and peak heat release rate (pHRR) = 15.5 kW/m2 (−87.4%)). In addition, this composite was characterized by the highest char yield (m600 = 17.9% (+44.1%)). In turn, the change in mechanical properties is related to a change in the physical and chemical structure of the foams as indicated by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis.

scholarly journals Influence of the Bottom Color Modification and Material Color Modification Process on the Performance of Modified Poplar

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 660
Author(s):  
Qingqing Liu ◽  
Di Gao ◽  
Wei Xu
Keyword(s):  
Chemical Properties ◽  
Target Color ◽  
Modification Process ◽  
Red Color ◽  
The Difference ◽  
Pre Treatment ◽  
Physical And Chemical ◽  
Surface Differentiation ◽  
Color Modification ◽  
And Chemical Properties

According to the old surface coating process of European and American furniture, the surface of modified poplar is first differentiated pre-treatment, and then the bottom color modification and material color modification are respectively applied to the modified poplar after the surface differentiation treatment. The visual physical quantity and physical and chemical properties were measured and compared with mahogany, which is commonly used in old furniture in Europe and America to explore the effect of colorants and coloring steps, as well as different surface pretreatments on the coloring effect. Finally, it is concluded that continuous coloring operations can narrow the difference in brightness and red color value in the coloring layer of modified poplar and mahogany. Continuous coloring operations increase the difference between the yellow-green color values of modified poplar and mahogany. Therefore, the coloring difference between modified poplar and mahogany was affected by the colorant and coloring steps. Through color accumulation, the gap between the two in the target color coloring effect can be reduced, thereby reducing the difference between the coloring effect of modified poplar and mahogany.

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