A novel metalloporphyrin-based conjugated microporous polymer for capture and conversion of CO2

RSC Advances ◽  
2015 ◽  
Vol 5 (40) ◽  
pp. 31664-31669 ◽  
Author(s):  
Xingfeng Sheng ◽  
Hongchen Guo ◽  
Yusheng Qin ◽  
Xianhong Wang ◽  
Fosong Wang
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Pore Volume ◽  
Cyclic Carbonate ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
Bet Specific Surface Area ◽  
Good Catalytic Activity

A novel conjugated microporous polymer was solvothermally synthesized, which had high BET specific surface area and pore volume, and displayed excellent capacity to capture carbon dioxide and good catalytic activity for cyclic carbonate synthesis.

scholarly journals Syngas Production via CO2 Reforming of Methane Over SrNiO3 and CeNiO3 Perovskites

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2928
Author(s):  
Naushad Ahmad ◽  
Fahad Alharthi ◽  
Manawwer Alam ◽  
Rizwan Wahab ◽  
Salim Manoharadas ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Active Sites ◽  
Catalyst Deactivation ◽  
Dry Reforming Of Methane ◽  
Volume Number ◽  
Syngas Production

The development of a transition-metal-based catalyst with concomitant high activity and stability due to its distinguishing characteristics, yielding an abundance of active sites, is considered to be the bottleneck for the dry reforming of methane (DRM). This work presents the catalytic activity and durability of SrNiO3 and CeNiO3 perovskites for syngas production via DRM. CeNiO3 exhibits a higher specific surface area, pore volume, number of reducible species, and nickel dispersion when compared to SrNiO3. The catalytic activity results demonstrate higher CH4 (54.3%) and CO2 (64.8%) conversions for CeNiO3, compared to 22% (CH4 conversion) and 34.7% (CO2 conversion) for SrNiO3. The decrease in catalytic activity after replacing cerium with strontium is attributed to a decrease in specific surface area and pore volume, and nickel active sites covered with strontium carbonate. The stability results reveal the deactivation of both the catalysts (SrNiO3 and CeNiO3) but SrNiO3 showed more deactivation than CeNiO3, as demonstrated by deactivation factors. The catalyst deactivation is mainly attributed to carbon deposition and these findings are verified by characterizing the spent catalysts.

Sulfur encapsulated in porous hollow CNTs@CNFs for high-performance lithium–sulfur batteries

2014 ◽  
Vol 2 (26) ◽  
pp. 10126-10130 ◽  
Author(s):  
Yuming Chen ◽  
Xiaoyan Li ◽  
Kyu-Sung Park ◽  
Jianhe Hong ◽  
Jie Song ◽  
...  
Keyword(s):  
Cathode Material ◽  
Specific Surface ◽  
Surface Area ◽  
Pore Volume ◽  
High Performance ◽  
High Capacity ◽  
Total Pore Volume ◽  
Bet Specific Surface Area ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

A novel carbon-sulfur nanoarchitecture with a high Brunauer–Emmett–Teller (BET) specific surface area of ~80 m2 g−1 and a total pore volume of ~0.2cm3 g−1 shows a high capacity of ~ 700 mAh g−1 at 1 C and 520 mAh g−1 at 5 C after 100 cycles, which makes it a superior cathode material for a rechargeable Li–S battery.

scholarly journals Тemplate synthesis of multidimensional porous silica

2020 ◽  
Vol 56 (1) ◽  
pp. 42-50
Author(s):  
T. F. Kouznetsova ◽  
A. I. Ivanets ◽  
O. N. Opanasenko ◽  
O. L. Zhigalova ◽  
O. V. Luksha ◽  
...  
Keyword(s):  
Low Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Template Synthesis ◽  
Pore Volume ◽  
Molecular Sieve ◽  
Porous Silica ◽  
Mesoporous Molecular Sieve ◽  
Surfactant Mixture ◽  
Bet Specific Surface Area

Isothermal data of superficial tension of solutions of surfactant mixture and low-temperature nitrogen sorption of multidimensional porous silica received by template synthesis prove complementarity of its properties and properties of SAA micelles. The measured isotherms of gas sorption belong to IV Type inherent in mesoporous adsorbents. The BET specific surface area is 600–800 m2/g, and the Gurvich pore volume is 0.7–1.0 cm3/g. With increase in mole fraction of nonionic component these values decrease, the ordered texture of SiO2, characteristic of MCM-48 mesoporous molecular sieve, collapses, d211-spacing becomes < 3.31 nm, and NLDFT distribution is transformed from monomodal to polymodal one.

scholarly journals THE STABILIZING OF ANATASE AEROGEL AT HIGH TEMPERATURE

2010 ◽  
Vol 4 (2) ◽  
pp. 110-116 ◽  
Author(s):  
Silvester Tursiloadi ◽  
Hiroshi Hirashima
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Anatase Phase ◽  
Total Pore Volume ◽  
Average Pore ◽  
Amorphous Sio2 ◽  
Bet Specific Surface Area ◽  
Sio2 Aerogel

Stable anatase is attractive to its notable functions for photo catalysis and photon-electron transfer.   Stable anatase TiO­2 containing amorphous SiO2 aerogel was prepared by hydrolysis of Ti (OC3H7)4 and Si (OC3H7)4 in a 2-propanol solution with acid catalyst. The solvent in wet gels was supercritically extracted in CO2 at 60 oC and 22 Mpa. Thermal evolutions of the microstructure of the gels were evaluated by TGA-DTA, N2 adsorption and XRD. A stable anatase TiO2 containing amorphous SiO2 aerogel with a BET specific surface area of 365 m2/g and a total pore volume of 0.20 cm3/g was obtained as prepared condition. The anatase phase was stable after calcination up to 1000 oC, and BET specific surface area, total pore volume and average pore diameter did not change significantly after calcination up to 900 oC.   Keywords: Supercritical extraction, sol-gel, aerogel, stable anatase structure

scholarly journals Three-dimensional nitrogen and boron codoped graphene for carbon dioxide and oils adsorption

RSC Advances ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 6467-6473 ◽  
Author(s):  
Ying Liu ◽  
Minghui Xiang ◽  
Li Hong
Keyword(s):  
Carbon Dioxide ◽  
Specific Surface ◽  
Surface Area ◽  
Pore Volume ◽  
Active Sites ◽  
Three Dimensional ◽  
High Specific Surface Area ◽  
Doped Graphene ◽  
Surface Active ◽  
Large Pore Volume

Three-dimensional heteroatom-doped graphene macroporous structures possess superior features, such as the large pore volume, numerous surface active sites and the high specific surface area.

scholarly journals Synthesis of 9-phenylcarbazole hyper-cross-linked polymers in different conditions and adsorption behavior for carbon dioxide

2019 ◽  
Author(s):  
Dandan Fang ◽  
Xiaodong Li ◽  
Meishuai Zou ◽  
Xiaoyan Guo ◽  
Aijuan Zhang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Reaction Temperature ◽  
Pore Volume ◽  
High Surface ◽  
Total Pore Volume ◽  
Synthesis Conditions ◽  
Bet Specific Surface Area ◽  
Cross Linker

To systematically explore the effects of the synthesis conditions on the porosity of hyper-cross-linked polymers (HCPs), a series of 9-phenylcarbazole HCPs (P1-P11) have been made by changing the dosage of cross-linker, the reaction temperature, catalyst usage and solvent dosage. Fourier transform infrared spectroscopy is utilized to characterize the structure of the obtained polymers. The TG analysis shows a high thermal stability of the HCPs. More importantly, comparative studies on the porous properties reveals that: molar ration of cross-linker and building block is the main factor of BET specific surface area; Improving reaction temperature or the usage of catalyst could increase the total pore volume greatly but sacrifice part of BET specific surface area; Fortunately changing solvent dosage could remedy this situation, that is slightly changing solvent dosage could simultaneously obtain high surface area and high total pore volume. The BET specific surface areas of P3 is up to 769 m2g-1 with narrow pore size distribution and the CO2 adsorption capacity of P11 is up to 52.4 cm3g-1 (273 K/1.00 bar).

scholarly journals Synthesis and Characteristics of Double-Shell Mesoporous Hollow Silica Nanomaterials to Improve CO2 Adsorption Performance

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1424
Author(s):  
Jong-tak Lee ◽  
Jae-Young Bae
Keyword(s):  
Carbon Dioxide ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Core Material ◽  
Carbon Dioxide Adsorption ◽  
Hollow Silica ◽  
Adsorption Performance ◽  
Amine Groups

To improve the adsorption performance of carbon dioxide, which is considered the main culprit of greenhouse gases, the specific surface area and high pore volume of the adsorbing material should be considered. For a porous material, the performance of carbon dioxide adsorption is determined by the amine groups supporting capacity; the larger the pore volume, the greater the capacity to support the amine groups. In this study, a double-shell mesoporous hollow silica nanomaterial with excellent pore volume and therefore increased amine support capacity was synthesized. A core–shell structure capable of having a hollow shape was synthesized using polystyrene as a core material, and a double-shell mesoporous shape was synthesized by sequentially using two types of surfactants. The synthesized material was subjected to a sintering process of 600 degrees, and the N2 sorption analysis confirmed a specific surface area of 690 m2/g and a pore volume of 1.012 cm3/g. Thereafter, the amine compound was impregnated into the silica nanomaterial, and then, a carbon dioxide adsorption experiment was conducted, which confirmed that compared to the mesoporous hollow silica nanomaterial synthesized as a single shell, the adsorption performance was improved by about 1.36 times.

scholarly journals Carbazole-functionalized hyper-cross-linked polymers for CO2 uptake based on Friedel–Crafts polymerization on 9-phenylcarbazole

2019 ◽  
Vol 15 ◽  
pp. 2856-2863 ◽  
Author(s):  
Dandan Fang ◽  
Xiaodong Li ◽  
Meishuai Zou ◽  
Xiaoyan Guo ◽  
Aijuan Zhang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Reaction Temperature ◽  
Pore Volume ◽  
Total Pore Volume ◽  
Molar Ratio ◽  
Co2 Uptake ◽  
Bet Specific Surface Area ◽  
Cross Linker

To systematically explore the effects of the synthesis conditions on the porosity of hyper-cross-linked polymers (HCPs), a series of 9-phenylcarbazole (9-PCz) HCPs (P1–P11) has been made by changing the molar ratio of cross-linker to monomer, the reaction temperature T 1, the used amount of catalyst and the concentration of reactants. Fourier transform infrared spectroscopy was utilized to characterize the structure of the obtained polymers. The TG analysis of the HCPs showed good thermal stability. More importantly, a comparative study on the porosity revealed that: the molar ratio of cross-linker to monomer was the main influence factor of the BET specific surface area. Increasing the reaction temperature T 1 or changing the used amount of catalyst could improve the total pore volume greatly but sacrificed a part of the BET specific surface area. Fortunately changing the concentration of reactants could remedy this situation. Slightly changing the concentration of reactants could simultaneously obtain a high surface area and a high total pore volume. The BET specific surface areas of P3 was up to 769 m2 g−1 with narrow pore size distribution and the CO2 adsorption capacity of P11 was up to 52.4 cm3 g−1 (273 K/1.00 bar).

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