scholarly journals Use of NH4Cl for activation of carbon xerogel to prepare a novel efficacious adsorbent for benzene removal from contaminated air streams in a fixed-bed column

2020 ◽  
Vol 18 (2) ◽  
pp. 1141-1149 ◽  
Author(s):  
Ayoob Rastegar ◽  
Mitra Gholami ◽  
Ahmad Jonidi Jafari ◽  
Ahmad Hosseini-Bandegharaei ◽  
Majid Kermani ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Fixed Bed ◽  
Carbon Aerogel ◽  
Carbon Xerogel ◽  
Fixed Bed Column ◽  
Structure And Morphology ◽  
Benzene Removal ◽  
Air Streams

Abstract Background Ammonium chloride as an explosive salt has proved to be a prominent activation agent for adsorbents and increase the specific surface area and volume of cavities. In this work, the ability of this substance was scrutinized for activation of carbon aerogel to prepare an efficient adsorbent for benzene removal from air streams. Methods A carbon xerogel was fabricated from Novallac polymer and activated by ammonium chloride.The changes in structure and morphology were considered via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Barrett-Joyner-Halenda (BJH), and energy dispersive X-ray (EDX) analyses. Also, comprehensive studies were conducted to vouchsafe the properties of the new adsorbent for benzene removal, using a fixed-bed column mode. Results The results showed both the successful synthesis and the suitability of the activation process. ACX possessed a higher specific surface area (1008 g/m3), compared to the parent carbon xerogel (CX; 543.7 g/m3) and organic xerogel (OX; 47 g/m3), as well as a higher adsorption capacity. Conclusion NH4CL is a very beneficial for modifying the structure and morphology of carbon aerogel, and the dynamic behavior of the column with respect inlet benzene concentration can be explained by Yan-Nelson model.

scholarly journals Effect of Acid Treatment on the Properties of Zeolite Catalyst for Straight-Run Gasoline Upgrading

2021 ◽  
Vol 1 (4) ◽  
pp. 1-1
Author(s):  
Ludmila Velichkina ◽  
◽  
Yakov Barbashin ◽  
Alexander Vosmerikov ◽  
◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Acid Treatment ◽  
Catalytic Properties ◽  
Fixed Bed ◽  
Acid Sites ◽  
Gasoline Fraction ◽  
Zeolite Catalysts ◽  
Acidic Properties

The objective of this research was to analyze the effect of different concentrations of nitric and hydrochloric acids on the structural, acidic, and catalytic properties of a post-synthetic treated ZSM-5 type zeolite at various temperatures. The properties of zeolite catalysts were determined using different methods, such as the Brunauer-Emmett-Teller (BET) method for specific surface area, temperature-programmed desorption (TPD) of ammonia method for acidic properties, and a flow-through unit with fixed bed catalyst (with upgrading straight-run gasoline fraction of oil) for catalytic activities of initial zeolite and acid-treated samples. The structural and acidic properties of both untreated and treated zeolites were investigated, and the effect of acid treatment on the catalytic properties of the samples in the course of upgrading the straight-run gasoline fraction of oil was determined. The post-synthetic treatment with aqueous nitric acid increased the specific surface area and volume of micropores of ZSM-5 zeolite, while the treatment with aqueous hydrochloric acid led to the formation of mesopores. Acid treatments of zeolite decreased the number of acid sites, mainly due to diminished concentration of low-temperature sites. The yield of liquid products in the conversion of straight-run gasoline fraction of oil, i.e., generation of high-octane gasolines with improved environmental features, was increased using acid-treated zeolites, which was due to the decrease in arene content.

scholarly journals Enhanced capacitive performance by improving the graphitized structure in carbon aerogel microspheres

RSC Advances ◽  
2020 ◽  
Vol 10 (37) ◽  
pp. 22242-22249
Author(s):  
Xichuan Liu ◽  
Lei Yuan ◽  
Minglong Zhong ◽  
Shuang Ni ◽  
Fan Yang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Aerogel ◽  
High Specific Surface Area ◽  
Activation Method ◽  
Carbon Aerogels ◽  
Capacitive Performance

Carbon aerogels (CAs) microspheres with good electrical conductivity and high specific surface area were synthesized by high temperature carbonization and CO2 activation method, which exhibit an enhanced capacitive performance in supercapacitors.

The Effect of Different Ratio in Carbon Aerogel on Pore Structure in Ambient Dry

2014 ◽  
Vol 941-944 ◽  
pp. 450-453 ◽  
Author(s):  
Fang Wang ◽  
Lan Fang Yao ◽  
Jun Shen ◽  
Da Yong Guan ◽  
Zhou Fang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Carbon Aerogel ◽  
Surface Characteristic ◽  
Carbon Aerogels ◽  
Water Solvent ◽  
Organic Aerogels

Organic aerogels were prepared by sol-gel polycondensation of resorcinol and formaldehyde using sodium carbonate as a catalyst and dried under ambient pressure. Carbon aerogels were obtained by the dried organic aerogels carbonized under nitrogen atmosphere at high temperature. The pore structures and surface characteristic of the carbon aerogels obtained were investigated by N2 adsorption isotherms, scanning electron microscope (SEM). Through controlling the concentrations of the main ingredients (resorcinol and formaldehyde), catalyst concentration, we can find out the best concentration which the specific surface area can reach the highest. In this experiment the highest specific surface area was 1645m2/g. In addition, the results show that catalyst for the cross link effect between colloidal microspheres is greater than the growth of the colloid itself, and the effect of water solvent plays an important role in the density of carbon aerogel.

Batch and fixed-bed adsorption behavior of porous boehmite with high percentage of exposed (020) facets and surface area towards Congo red

2021 ◽  
Author(s):  
Zijia Li ◽  
Li He ◽  
Weiliang Tian ◽  
Renyao Huang ◽  
Xingpeng Wang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Congo Red ◽  
Fixed Bed ◽  
Adsorption Behavior ◽  
Large Specific Surface Area ◽  
Excellent Performance ◽  
Fixed Bed Adsorption

Boehmite adsorbents with high percentage of exposed (020) facets and large specific surface area were prepared by a separate nucleation and aging steps route with excellent performance towards Congo red in batch and fixed-bed adsorption columns.

scholarly journals Removal of Sb(III) by 3D-reduced graphene oxide/sodium alginate double-network composites from an aqueous batch and fixed-bed system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiuzhen Yang ◽  
Tengzhi Zhou ◽  
Renjian Deng ◽  
Zhenya Zhu ◽  
Atif Saleem ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Specific Surface ◽  
Reduced Graphene Oxide ◽  
Sodium Alginate ◽  
Surface Area ◽  
Specific Surface Area ◽  
Fixed Bed ◽  
Chloride Concentration ◽  
Double Network ◽  
Reduced Graphene

AbstractWe created 3D-reduced graphene oxide/sodium alginate double network (GAD) beads to address the problem of local water pollution by antimony. GAD is a novel material with the high specific surface area of graphene and biosecurity of sodium alginate. Due to the introduction of graphene, the thermal stability and specific surface area of GAD are enhanced, as shown from the FTIR, TGA, BET, Raman, and XRD characterizations. The influence of different environmental variables-such as the pH, dosage, temperature, contact time, and sodium chloride concentration on the Sb(III) sorption with GAD-was investigated. The adsorption results fit well with both the pseudo-second order (R2 > 0.99) and Freundlich (R2 > 0.99) isotherm models. The temperature rise has a negative influence on the adsorption. The Langmuir adsorption capacity is 7.67 mg/g, which is higher than many adsorbents. The GAD results from the fixed-bed adsorption experiment were a good fit with the Thomas model (R2 > 0.99). In addition, GAD appears to be a renewable and ideal adsorbent for the treatment of antimony pollution in aqueous systems.

scholarly journals Characteristics of carbon aerogel at variation in pyrolysis conditions

2016 ◽  
Vol 19 (3) ◽  
pp. 88-95
Author(s):  
Duyen Khac Le ◽  
Nghiep Quoc Pham ◽  
Kien Anh Le
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pyrolysis Temperature ◽  
Ambient Pressure ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Carbon Aerogel ◽  
Ambient Pressure Drying ◽  
Xrd Diffraction

Carbon aerogel was obtained by pyrolysis of organic aerogel by ambient pressure drying technique. The effect of pyrolysis conditions on characteristics of carbon aerogel such as density, specific surface area and conductivity was studied. The properties and structure of carbon aerogel samples were investigated by nitrogen adsorption, four-point probe method and XRD diffraction. The results showed that carbon aerogel had structure between amorphous and graphite state. The highest specific surface area was 800 m2/g at pyrolysis temperature of 700oC. The pore-size was distributed in microporous, with the maximum total pore volume of 0.44 cm3/g. The electrical conductivity of carbon aerogel was highest at pyrolysis temperature of 800-900oC with the value in the range of 1.744-1.923 S/cm.

The Adsorption/Desorption Dynamics Properties of N-Alkanes in Light Naphtha on 5A Zeolites

2013 ◽  
Vol 807-809 ◽  
pp. 2643-2646
Author(s):  
Xiang Ji ◽  
Qing Sheng Zhang ◽  
Qun Cui ◽  
Hai Yan Wang
Keyword(s):  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Fixed Bed ◽  
Light Naphtha ◽  
Bet Specific Surface Area ◽  
Purge Gas ◽  
Adsorption Desorption

Self-made JH4 zeoite was characterized by BET, mercury and other methods. The dynamic adsorption capacity of nC5/nC6 in light naphtha on JH4 zeolite fixed bed was investigated. The effect of cyclic purge exhaust composition, which simulate different condensation conditions, on desorption performance of JH4 zeolite bed was studied. The results shows that, the microporous BET specific surface area and pore volume of JH4 zeolite is 710.05 m2/g and 0.32 cm3/g; macropore specific surface area and pore volume is 3.64 m2/g and 0.29 cm3/g, respectively. Under the adsorption conditions of 0.1 MPa, 165 °C, adsorption capacity of n-pentane and n-hexane in light naphtha on JH4 zeolite reaches, 7.24 g/100gadsand 3.11 g/100gadsrespectively.If the content of pentane and hexane achieves 3.68% and 0.21% in nitrogen purge gas, total desorption amount of JH4 zeolite is 2.07 g/100gads, falling 60.19% than that of pure N2purge.

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