scholarly journals Comparison of Kinetic Models for CO2 Gasification of Coconut-Shell Chars: Carbonization Temperature Effects on Char Reactivity and Porous Properties of Produced Activated Carbons

2013 ◽  
Vol 17 (1) ◽  
pp. 13-28 ◽  
Author(s):  
Chaiyot Tangsathitkulchai ◽  
Supunnee Junpirom ◽  
Juejun Katesa
Keyword(s):  
Kinetic Models ◽  
Temperature Effects ◽  
Activated Carbons ◽  
Carbonization Temperature ◽  
Coconut Shell ◽  
Co2 Gasification ◽  
Porous Properties ◽  
Char Reactivity

scholarly journals The Analysis of Pore Development and Formation of Surface Functional Groups in Bamboo-Based Activated Carbon during CO2 Activation

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5641
Author(s):  
Krittamet Phothong ◽  
Chaiyot Tangsathitkulchai ◽  
Panuwat Lawtae
Keyword(s):  
Activated Carbon ◽  
Functional Groups ◽  
Active Sites ◽  
Activated Carbons ◽  
Carbonization Temperature ◽  
Activation Process ◽  
Activation Time ◽  
Oxygen Functional Groups ◽  
Porous Properties ◽  
Activation Conditions

Pore development and the formation of oxygen functional groups were studied for activated carbon prepared from bamboo (Bambusa bambos) using a two-step activation with CO2, as functions of carbonization temperature and activation conditions (time and temperature). Results show that activated carbon produced from bamboo contains mostly micropores in the pore size range of 0.65 to 1.4 nm. All porous properties of activated carbons increased with the increase in the activation temperature over the range from 850 to 950 °C, but decreased in the temperature range of 950 to 1000 °C, due principally to the merging of neighboring pores. The increase in the activation time also increased the porous properties linearly from 60 to 90 min, which then dropped from 90 to 120 min. It was found that the carbonization temperature played an important role in determining the number and distribution of active sites for CO2 gasification during the activation process. Empirical equations were proposed to conveniently predict all important porous properties of the prepared activated carbons in terms of carbonization temperature and activation conditions. Oxygen functional groups formed during the carbonization and activation steps of activated carbon synthesis and their contents were dependent on the preparation conditions employed. Using Boehm’s titration technique, only phenolic and carboxylic groups were detected for the acid functional groups in both the chars and activated carbons in varying amounts. Empirical correlations were also developed to estimate the total contents of the acid and basic groups in activated carbons in terms of the carbonization temperature, activation time and temperature.

Porous Properties of Activated Carbons Prepared from Mixtures of Synthesized Phenolic Resins with Metal Salts

2007 ◽  
Vol 40 (5) ◽  
pp. 410-414
Author(s):  
Kyuya Nakagawa ◽  
Kazuhisa Tamura ◽  
Shin R. Mukai ◽  
Tetsuo Suzuki ◽  
Hajime Tamon
Keyword(s):  
Activated Carbons ◽  
Metal Salts ◽  
Phenolic Resins ◽  
Porous Properties

scholarly journals Isothermal CO2 Gasification Reactivity and Kinetic Models of Biomass Char/Anthracite Char

BioResources ◽  
2015 ◽  
Vol 10 (3) ◽  
Author(s):  
Hai-Bin Zuo ◽  
Peng-Cheng Zhang ◽  
Jian-Liang Zhang ◽  
Xiao-Tao Bi ◽  
Wei-Wei Geng ◽  
...  
Keyword(s):  
Kinetic Models ◽  
Co2 Gasification ◽  
Gasification Reactivity ◽  
Biomass Char ◽  
Co2 Gasification Reactivity

scholarly journals Performance of Sweet Potato’s Leaf-Derived Activated Carbon for Hydrogen Sulphide Removal from Biogas

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Geni Juma ◽  
Revocatus Machunda ◽  
Tatiana Pogrebnaya
Keyword(s):  
Activated Carbon ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Carbonization Temperature ◽  
Optimal Test ◽  
Potato Leaf ◽  
Bet Analysis ◽  
S 100 ◽  
Activation Ratio

In this study, sweet potato leaf activated carbon (SpLAC) was prepared by the chemical activation method using KOH and applied as an adsorbent for H2S removal from biogas. The study focused on the understanding of the effect of carbonization temperature (Tc), varying KOH : C activation ratio, flow rate (FR) of biogas, and mass of SpLAC on sample adsorption capacity. The BET analysis was performed for both fresh and spent activated carbons as well as for carbonized samples, which were not activated; also, the activated carbon was characterized by XRF and CHNS techniques. The results showed that removal efficiency (RE) of the SpLAC increased with increase carbonization temperature from 600 to 800°C and the mass of sorbent from 0.4 g to 1.0 g. The optimal test conditions were determined: 1.0 g of sorbent with a KOH : C ratio of 1 : 1, Tc=800°C, and FR=0.02 m3/h which resulted in a sorption capacity of about 3.7 g S/100 g of the SpLAC. Our findings corroborated that H2S removal was contributed not only by the adsorption process with the pore available but also by the presence of iron in the sample that reacted with H2S. Therefore, upon successful H2S sorption, SpLAC is suggested as a viable adsorbent for H2S removal from biogas.

Sign in / Sign up

Export Citation Format

Share Document