The synthesis of Al-MCM-41 from volclay — A low-cost Al and Si source

2009 ◽  
Vol 46 (2) ◽  
pp. 185-189 ◽  
Author(s):  
M. Adjdir ◽  
T. Ali-Dahmane ◽  
F. Friedrich ◽  
T. Scherer ◽  
P.G. Weidler
Keyword(s):  
Low Cost ◽  
Mcm 41

scholarly journals Fly ash-derived MCM-41 as a low-cost silica support for polyethyleneimine in post-combustion CO2 capture

2017 ◽  
Vol 22 ◽  
pp. 81-90 ◽  
Author(s):  
R. Panek ◽  
M. Wdowin ◽  
W. Franus ◽  
D. Czarna ◽  
L.A. Stevens ◽  
...  
Keyword(s):  
Fly Ash ◽  
Co2 Capture ◽  
Low Cost ◽  
Silica Support ◽  
Mcm 41

A Novel Way to Synthesize Mesoporous Silica Coated on the CNTs with Larger Holes Based on “MCM-41” CNTs@SiO2

2011 ◽  
Vol 236-238 ◽  
pp. 1906-1909
Author(s):  
Wen Rui Zheng ◽  
Min Zhang ◽  
Jing Li Xu ◽  
Tao Huang
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Mesoporous Materials ◽  
High Efficiency ◽  
Low Cost ◽  
Novel Method ◽  
Mcm 41

We present a novel method to synthesize mesoporous nickel siliceous coated on CNTs with larger hole based on the mesoporous silica coated on CNTs, the pore size of mesoporous silica coated on CNTs was enlarged to 7.8 nm from 2.72 nm. Compared to others’ work, our method is low cost, simple and high efficiency. And more importantly, this method shows great potential in applying other type of mesoporous materials such as SBA-15 etc.

scholarly journals Kinetic Analysis for the Catalytic Pyrolysis of Polypropylene over Low Cost Mineral Catalysts

2021 ◽  
Vol 13 (23) ◽  
pp. 13386
Author(s):  
Young-Min Kim ◽  
Sumin Pyo ◽  
Hanie Hakimian ◽  
Kyung-Seun Yoo ◽  
Gwang-Hoon Rhee ◽  
...  
Keyword(s):  
Kinetic Analysis ◽  
Pore Size ◽  
Catalytic Pyrolysis ◽  
Low Cost ◽  
Decomposition Temperature ◽  
The Other ◽  
Model Free ◽  
Large Pore ◽  
Large Pore Size ◽  
Mcm 41

A kinetic analysis of non-catalytic pyrolysis (NCP) and catalytic pyrolysis (CP) of polypropylene (PP) with different catalysts was performed using thermogravimetric analysis (TGA) and kinetic models. Three kinds of low-cost natural catalysts were used to maximize the cost-effectiveness of the process: natural zeolite (NZ), bentonite, olivine, and a mesoporous catalyst, Al-MCM-41. The decomposition temperature of PP and apparent activation energy (Ea) were obtained from the TGA results at multiple heating rates, and a model-free kinetic analysis was performed using the Flynn–Wall–Ozawa model. TGA indicated that the maximum decomposition temperature (Tmax) of the PP was shifted from 464 °C to 347 °C with Al-MCM-41 and 348 °C with bentonite, largely due to their strong acidity and large pore size. Although olivine had a large pore size, the Tmax of PP was only shifted to 456 °C, because of its low acidity. The differential TG (DTG) curve of PP over NZ revealed a two-step mechanism. The Tmax of the first peak on the DTG curve of PP with NZ was 376 °C due to the high acidity of NZ. On the other hand, that of the second peak was higher (474 °C) than the non-catalytic reaction. The Ea values at each conversion were also decreased when using the catalysts, except olivine. At <0.5 conversion, the Ea obtained from the CP of PP with NZ was lower than that with the other catalysts: Al-MCM-41, bentonite, and olivine, in that order. The Ea for the CP of PP with NZ increased more rapidly, to 193 kJ/mol at 0.9 conversion, than the other catalysts.

scholarly journals Synthesis and Grafted NH2-Al/MCM-41 with Amine Functional Groups as Humidity Control Material from Silicon Carbide Sludge and Granite Sludge

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2107
Author(s):  
Ya-Wen Lin ◽  
Wei-Hao Lee ◽  
Kae-Long Lin ◽  
Bo-Yi Kuo
Keyword(s):  
Silicon Carbide ◽  
Surface Properties ◽  
Functional Groups ◽  
Low Cost ◽  
Moisture Adsorption ◽  
Adsorption And Desorption ◽  
Japanese Industrial Standard ◽  
Building Engineering ◽  
Desorption Capacity ◽  
Mcm 41

Mesoporous Al/MCM-41 was synthesized by extracting silicon carbide sludge and granite sludge as the sources of silicon and aluminum. Different concentrations of aminosilane (2.5, 5, 7.5 vol.%) were used to reflux the grafted NH2-Al/MCM-41 with amine functional groups (NH2-Al/MCM-41). The physical and chemical characteristics were analyzed. The results confirmed that silicon carbide sludge and granite sludge can effectively synthesize Al/MCM-41 with low cost and environmental protection. Reflow grafted amine functional groups can effectively improve the surface properties of NH2-Al/MCM-41. The moisture adsorption and desorption capacity of grafted NH2-Al/MCM-41 with amine functional groups was also studied. Based on moisture adsorption and desorption capacity, the surface properties of NH2-Al/MCM-41 were studied. When 5 vol.% of NH2-Al/MCM-41 amine functional groups is added, the moisture adsorption and desorption capacity is best. When the relative humidity = 95%, the equilibrium moisture content is 39.4 kg/kg, which complies with the standard of Japanese Industrial Standard (JIS A 1475). Therefore, the use of waste derived from the industry to replace expensive commercial materials was simple and environmentally friendly, and the grafted NH2-Al/MCM-41 with amine functional groups can be utilized in multiple applications, particularly as moisture regulation materials in building engineering.

scholarly journals Observation on Responsive OCV Variation od Zinc-Air Cell with Relative Humidity Content

2012 ◽  
Vol 12 (5) ◽  
Author(s):  
Hanisah Manshor ◽  
Raihan Othman ◽  
Anis Nurashikin Nordin ◽  
Mohd. Hanafi Ani ◽  
Hens Saputra
Keyword(s):  
Relative Humidity ◽  
Linear Correlation ◽  
Open Circuit Voltage ◽  
Low Cost ◽  
Open Circuit ◽  
Property A ◽  
Humidity Sensing ◽  
Good Linear ◽  
Good Linear Correlation ◽  
Mcm 41

Zinc/MCM-41/air cell, in its dry form without the electrolyte,demonstrates humidity sensing property. A good linear correlation between the cell's open circuit voltage (OCV) and the relative humidity content is observed. The systempossesses the potential to be developed into a low cost microhumidity sensor. An ultra thin cell of thickness not more than 40 μm has been fabricated and its use as a humiditysensor is substantiated.ABSTRAK: Sel zinc/MCM-41/udara, dalam keadaan kering tanpa elektrolit, menunjukkan sifat pencirian kelembapan. Voltan litar terbuka sel didapati menunjukkan korelasi linear yang baik terhadap kandungan kelembapan relatif. Sistem ini berpotensi untuk dibangunkan menjadi penciri kelembapan mikro yang murah. Sel yang amat nipis dengan ketebalan tidak melebihi 40 μm telah difabrikasi and kegunaannya sebagai penciri kelembapan dibuktikan.

Synthesis Optimization of Mesoporous MCM-41 Materials in Acidic Media

1996 ◽  
Vol 454 ◽  
Author(s):  
A. Karlsson ◽  
R. Schmidt ◽  
M. Stocker
Keyword(s):  
Low Cost ◽  
High Surface ◽  
Point Of View ◽  
High Yield ◽  
Acid Mixture ◽  
Synthesis Time ◽  
Surface Areas ◽  
Short Synthesis ◽  
Enhanced Adsorption ◽  
Mcm 41

ABSTRACTThe synthesis of MCM-41 in a highly acidic medium has been optimised. It was found that the relatively low-cost synthesis gave a material with extremely high surface areas (more than 1500 m2/g) compared to that obtained in conventional alkaline synthesis (ca 1100 m2/g). Judged by the short synthesis time, high yield, enhanced adsorption capacity, large particle size and thermal stability, the acid route to MCM-41 appears promising from an industrial point of view. Additional cost-reducing steps, such as the recycling of the “acid matrix” and the reduction of the volume of the water/acid mixture were successfully applied.

scholarly journals Enhancement of adsorption capacity of low cost mesoporous MCM-41 and their antibacterial and antifungal activities

2020 ◽  
Vol 6 (12) ◽  
pp. 1250j7 ◽  
Author(s):  
Noria Bouchikhi ◽  
Mehdi Adjdir ◽  
Kamel C Bendeddouche ◽  
Djamila Bouazza ◽  
Adel Mokhtar ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Low Cost ◽  
Antifungal Activities ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal ◽  
Mcm 41

Freundlich, Langmuir, Temkin, DR and Harkins-Jura Isotherm Studies on the Adsorption of CO2 on Various Porous Adsorbents

2018 ◽  
Vol 17 (5) ◽  
Author(s):  
Fatma Oguz Erdogan
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Type A ◽  
Isotherm Models ◽  
Koh Activation ◽  
Cornelian Cherry ◽  
Cornus Mas ◽  
Adsorption Capacities ◽  
Mcm 41

Abstract The objective of the study was to prepare low-cost activated carbon from cornelian cherry stones (Cornus mas L.) and compare its adsorption capacities for CO2 with that of commercial multiwalled carbon nanotubes, activated carbon, MCM-41 and four zeolites (silver exchanged, 13X, faujasite type and linde type A). BET, t-plot and DFT methods were used for the characterization of all adsorbent samples based on N2 adsorption-desorption data obtained at 77 K. The produced activated carbon samples (KAC and NAC) were also characterized by scanning electron microscopy (SEM). The adsorption data were evaluated by several isotherm models such as Freundlich, Langmuir, Temkin, DR and Harkins-Jura isotherm models. Langmuir adsorption isotherms constants related to adsorption capacity, Wm were found as 11.496, 6.175, 4.189, 3.986 and 3.50 mmol/g for NAC, KAC, faujasite type zeolit, MCM-41 and AC, respectively. The CO2 adsorption capacities of the silver exchanged, 13X, faujasite type and linde type A zeolites were 10.814, 10.241, 14.608 and 13.343 wt%, respectively. Microporous zeolites showed higher CO2 adsorption capacities than the mesoporous MCM-41 and MWCNT. The CO2 adsorption capacity of commercial activated carbon (AC) was found to be 9.428 wt%, while the CO2 adsorption capacities of activated carbons obtained using NaOH and KOH were found to be 13.685 and 15.057 wt%, respectively. The highest CO2 adsorption capacity of 15.057 wt% was achieved with KAC. It could be confirmed that NaOH or KOH activation plays an important role to determine the porous structure and amount of CO2 adsorbed. Results showed that activated carbon produced from cornelian cherry stones is suitable for the adsorption of CO2 and could be used as a low cost effective adsorbent in the capture of CO2.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

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