Hierarchically Nanostructured Zeolites of Tunable Porosities with Aerogel Templating

2011 ◽  
Vol 1306 ◽  
Author(s):  
Yousheng Tao ◽  
Morinobu Endo ◽  
Katsumi Kaneko
Keyword(s):  
Carbon Dioxide ◽  
Template Synthesis ◽  
Colloidal Silica ◽  
Lower Cost ◽  
Supercritical Drying ◽  
Nanoporous Carbon ◽  
Carbon Aerogels ◽  
Resorcinol Formaldehyde ◽  
Carbon Xerogels ◽  
Recent Developments

ABSTRACTWe present the synthesis of resorcinol-formaldehyde aerogels and carbon aerogels of different nanoporosities, emphasizing on the recent developments in fabrication pathways of lower cost. Recent results showed a simple way to the production of highly nanoporous carbon xerogels. While using an approach combined colloidal silica nanocasting and carbon dioxide supercritical drying, hydrophilicity-controlled carbon aerogels with high mesoporosity were synthesized. Then, we demonstrate the functions of these aerogels for template synthesis of hierarchically nanostructured zeolites having micropores and mesopores.

Fabrication of Carbon Aerogels

2006 ◽  
Vol 11-12 ◽  
pp. 19-22 ◽  
Author(s):  
Y.N. Feng ◽  
Lei Miao ◽  
Yong Ge Cao ◽  
T. Nishi ◽  
Sakae Tanemura ◽  
...  
Keyword(s):  
Pore Size ◽  
Sol Gel ◽  
Supercritical Drying ◽  
Limited Range ◽  
Molar Ratio ◽  
Carbon Aerogels ◽  
Resorcinol Formaldehyde ◽  
Catalyst Content ◽  
Fabrication Parameters ◽  
Pyrolysis Processes

RF (Resorcinol-Formaldehyde) aerogels and carbon aerogels were prepared through the sol-gel method following the routes of polymerization, gelation, supercritical drying and pyrolysis processes. The influence of fabrication parameters on the textural structure of the samples, e.g., specific surface area, pore size, and pore size distribution, etc., were systematically investigated. With a decrease in the R/F molar ratio, or an increase in the catalyst content within a limited range, the porosity of the nanostructure materials increases. The optimal temperature of pyrolysis for RF aerogel was investigated by TGA (Thermogravimetric Analysis).

scholarly journals Influence of Graphene Oxide Incorporation on Resorcinol-Formaldehyde Polymer and Carbon Aerogels

2018 ◽  
Vol 62 (4) ◽  
Author(s):  
Balázs Nagy ◽  
Andrea Domán ◽  
Alfréd Menyhárd ◽  
Krisztina László
Keyword(s):  
Graphene Oxide ◽  
Nitrogen Adsorption ◽  
Supercritical Drying ◽  
Carbon Aerogel ◽  
Nitrogen Atmosphere ◽  
Carbon Aerogels ◽  
Polymer Gel ◽  
X Ray Diffraction ◽  
Resorcinol Formaldehyde ◽  
Polymer Hydrogels

Resorcinol-formaldehyde based polymer hydrogels with various graphene oxide (GO) content were synthesized using Na2CO3 as catalyst at pH=6 conditions. After supercritical drying they were converted to carbon aerogels in nitrogen atmosphere. The heat treatment not only pyrolysed the polymer gel, but also reduced GO. The GO added varied within 0-14% related to the mass of resorcinol which resulted in the reinforcement of the polymer matrix. The texture of the polymer and the carbon aerogels were characterized and compared in the nanoscale using SEM and TEM imaging, X-ray diffraction (XRD) and low temperature nitrogen adsorption measurements. The transition from polymer to carbon state was studied by thermogravimetry. In agreement with reference works in the GO range studied the morphology was not affected by the GO content either in the polymer or in the carbon form. The direct current (DC) conductivity however linearly increased with the added GO and already 10 % doubled the conductivity of the plain carbon aerogel.

A review on recent developments in solar photoreactors for carbon dioxide conversion to fuels

2021 ◽  
Vol 47 ◽  
pp. 101515 ◽  
Author(s):  
Angel Francis ◽  
Shanmuga Priya S. ◽  
Harish Kumar S ◽  
Sudhakar K ◽  
Muhammad Tahir
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Conversion ◽  
Recent Developments

Nanoporous Carbon Aerogels for Laser-Printed Wearable Sensors

2021 ◽  
Author(s):  
Xiujie Ji ◽  
Ying Zhong ◽  
Chenyue Li ◽  
Junjun Chu ◽  
Hongqiang Wang ◽  
...  
Keyword(s):  
Wearable Sensors ◽  
Nanoporous Carbon ◽  
Carbon Aerogels

Recent Developments in Plate Exchangers—Ammonia/Carbon Dioxide Cascade Condensers

2013 ◽  
Vol 34 (5-6) ◽  
pp. 401-408 ◽  
Author(s):  
Zahid Ayub ◽  
M. Sultan Khan ◽  
Amir Jokar ◽  
Tariq S. Khan ◽  
Niel Hayes
Keyword(s):  
Carbon Dioxide ◽  
Recent Developments

Causal Examination of Carbon Emissions and Economic Growth for Sustainable Environment: Evidence from Ghana

2021 ◽  
Vol 39 (8) ◽  
Author(s):  
Bosede Ngozi Adeleye ◽  
Emmanuel Nketiah ◽  
Mavis Adjei
Keyword(s):  
Economic Growth ◽  
Carbon Dioxide ◽  
Carbon Emissions ◽  
Sustainable Development Goals ◽  
Coal Gasification ◽  
Lower Cost ◽  
Causal Analysis ◽  
Environmental Benefits ◽  
Sustainable Environment ◽  
Development Goals

This study aligns with the 2030 Sustainable Development Goals (SDGs) 8, and 13 to evaluate the causal relationship between carbon emissions and economic growth in Ghana from 1960 to 2018. Using a battery of econometric techniques, findings indicate, among others, that economic growth is a positive predictor of carbon emissions. Inferences from these estimations point to a growth-led emissions nexus in Ghana. The causal analysis further provides evidence, though weak, that economic growth Granger-cause carbon emissions. Hence, policymakers should encourage coal gasification in Ghana, offering better environmental benefits at a lower cost to address the atmospheric build-up of carbon dioxide.

A novel approach to alginate aerogels: carbon dioxide induced gelation

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 7812-7818 ◽  
Author(s):  
P. Gurikov ◽  
S. P. Raman ◽  
D. Weinrich ◽  
M. Fricke ◽  
I. Smirnova
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Drying ◽  
Novel Approach

A novel process, carbon dioxide induced gelation, opens new pathways towards hydrogels and can be coupled with supercritical drying to produce aerogels.

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