Synthesis and Characterizations of MCM-41 Silica with Thick Pore Wall

2011 ◽  
Vol 233-235 ◽  
pp. 2034-2037
Author(s):  
Qiong Wei Hou ◽  
En Hui Yuan ◽  
Jin Gang Jiang ◽  
Kun Zhang
Keyword(s):  
High Temperature ◽  
Mesoporous Silica ◽  
Wall Thickness ◽  
Pore Wall ◽  
Crystallization Time ◽  
Pore Channel ◽  
Desorption Branch ◽  
Cetyltrimethylammonium Tosylate ◽  
Pore Wall Thickness ◽  
Mcm 41

Nano-structured mesoporous silica with highly ordered 2D hexagonal topology has been synthesized using novel surfactant cetyltrimethylammonium tosylate (CTATos) as template via directly hydrothermal treatment at high temperature of 175 °C and varied crystallization time. The maximum pore wall thickness is up to 2.2 nm calculated by BdB method from desorption branch. The enlargement of pore wall thickness and unit-lattice of currently synthesized MCM-41 silica is attributed to the migration and subsequent deposition of the silicate species in the inner pore channel.

Valorization of cellulose-doped lignin: application of cellulose-doped lignin-derived activated carbon in capacitors and investigation of its textural properties and electrochemical performance

2021 ◽  
Author(s):  
Liangcai Wang ◽  
Xin Feng ◽  
Huanhuan Ma ◽  
Jielong Wu ◽  
Yu Chen ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Specific Capacitance ◽  
Surface Area ◽  
Specific Surface Area ◽  
Wall Thickness ◽  
Textural Properties ◽  
Pore Wall ◽  
Surface Areas ◽  
Pore Wall Thickness

Abstract This work provides an idea for efficient and harmless utilization of lignin and further evaluated the textural properties of lignin-derived activated carbon/specific capacitance relationship. The yield of cellulose-doped apricot shell lignin (ASLC) was 30.42%. H3PO4/KOH was used to assist the preparation of ASLC-derived activated carbon (AAC) for capacitors. The specific surface areas of the as-obtained AAC-P-3 and AAC-K-2 were 1475.16 m2/g and 2136.56 m2/g, respectively. The specific capacitances of AAC-P-3 and AAC-K-2 were 169.14 F/g and 236.00 F/g, respectively, upon the current density of 0.50 A/g. In capacitors containing aqueous KOH as the electrolyte, the AR2 (0.983) between specific surface area and specific capacitance was highest, followed by the AR2 (0.978) between Vmicro/Vmeso and specific capacitance, the AR2 (0.975) between pore-wall thickness and specific capacitance. Consequently, the specific capacitances of the AACs depend not only the specific surface area, but also on the Vmicro/Vmeso, pore-wall thickness, and Vmicro.

Improved synthesis and study of acidic properties of ‘plugs’-containing Al-SBA-15 materials

2010 ◽  
Vol 76 (1) ◽  
pp. 39-49 ◽  
Author(s):  
ZhiQi Jia ◽  
YongXiang Zhao
Keyword(s):  
Catalytic Activity ◽  
Pore Wall ◽  
Point Of View ◽  
Polymerization Reaction ◽  
Acidic Properties ◽  
Acidic Sites ◽  
Pore Wall Thickness ◽  
Aluminum Precursor ◽  
Large Pore Size ◽  
Mcm 41

A novel ‘plugs’-containing Al-SBA-15 material (denoted as PAS) was directly synthesized through simultaneous introducing toluene and aluminum precursor into the reaction mixture of traditional SBA-15. Such material not only featured a unique two-step desorption isotherm as conventional plugged SBA-15 synthesized using excessive siliceous precursor, and higher pore wall thickness than that of other analogous materials, but also possessed weak and medium acidic sites, which implied the PAS would offer unusual advantages such as multifunctionality to process a large variety of feed-stocks in acid-involved reaction (e.g. polymerization of tetrahydrofuran) in industrial point of view. In addition, catalytic activity of the PAS was investigated by the tetrahydrofuran (THF) polymerization reaction in the presence of acetic anhydride and compared with Al-doped MCM-41 prepared via conventional direct hydrothermal synthesis. The PAS exhibited good performance on polymerization of THF. Such result could be related to the large pore size and moderate acidic sites.

Fast temperature-responsive nanocomposite PNIPAM hydrogels with controlled pore wall thickness: Force and rate of T-response

2012 ◽  
Vol 48 (12) ◽  
pp. 1997-2007 ◽  
Author(s):  
Katarzyna Depa ◽  
Adam Strachota ◽  
Miroslav Šlouf ◽  
Jiřina Hromádková
Keyword(s):  
Wall Thickness ◽  
Pore Wall ◽  
Temperature Responsive ◽  
Pore Wall Thickness

Control of the pore wall thickness and thermal stability in low-cost bimodal porous silicas

Polyhedron ◽  
2019 ◽  
Vol 170 ◽  
pp. 544-552 ◽  
Author(s):  
José Manuel Morales ◽  
Jamal El Haskouri ◽  
Carmen Guillem ◽  
Rahma Hany ◽  
José Vicente Ros-Lis ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Wall Thickness ◽  
Low Cost ◽  
Pore Wall ◽  
Pore Wall Thickness
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