High temperature capture of CO2 on lithium-based sorbents from rice husk ash

Wang, Ke; Guo, Xueyi; Zhao, Peng; Wang, Fanzi; Chen, Zheng

doi:10.1016/j.jhazmat.2011.02.040

Cited by 120 publications

(84 citation statements)

References 38 publications

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“…The sorbent showed the best sorption performance and the fastest sorption kinetics at 650 • C, with a CO 2 sorption capacity of 34.39 wt %. Compared with other Li 4 SiO 4 -based sorbents that were also synthesized from cheap SiO 2 precursors, the Li 4 SiO 4 -(EX-VMT)-4 sample obtained in this research exhibited a higher CO 2 capacity [27,28]. When the sorption temperature dropped to 600 • C, the CO 2 sorption capacity of Li 4 SiO 4 -(EX-VMT)-4 was only 22.11 wt %, which may be due to the kinetic limitation at a low sorption temperature.…”

Section: Co2 Capture Performance Of Synthesized Li4sio4 and Ldh-basedmentioning

confidence: 80%

“…So far, there are a few reports on the synthesis of Li 4 SiO 4 from waste silicon-containing materials including fly ash [26], rice husk ashes [27], and halloysite [28]. The Li 4 SiO 4 which was synthesized with rice husk ashes achieved a 30.5 wt % maximum sorption at 680 • C and the Li 4 SiO 4 which was synthesized with halloysite reached a maximum adsorption capacity of 34.75 wt % at 700 • C. However, there are almost no reports on the synthesis of LDH-derived CO 2 sorbents from either industrial solid wastes or minerals.…”

Section: Introductionmentioning

confidence: 99%

“…During this pretreatment process, a large amount of acidic wastewater with metal ions including Mg, Al, and Fe, is produced. The discharge of such wastewater causes severe environmental problems [27,[35][36][37]. Thus, an environmentally benign scheme for the utilization of the vermiculite mineral is highly desired for a more sustainable society.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Environmental Benign Synthesis of Lithium Silicates and Mg-Al Layered Double Hydroxide from Vermiculite Mineral for CO2 Capture

Zhou

Louis

et al. 2017

Catalysts

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This research introduces a completely new environmental benign synthesis route for obtaining two kinds of inter-mediate and high temperature CO 2 sorbents, Mg-Al layered double hydroxide (LDH) and Li 4 SiO 4 , from vermiculite. The mineral vermiculite was leached with acid, from which the obtained SiO 2 was used for the synthesis of Li 4 SiO 4 and the leaching waste water was used for the synthesis of Mg-Al LDH. Therefore, no waste was produced during the whole process. Both Li 4 SiO 4 and Mg-Al LDH sorbents were carefully characterized using XRD, SEM, and BET analyses. The CO 2 capturing performance of these two sorbents was comprehensively evaluated. The influence of the Li/Si ratio, calcination temperature, calcination time, and sorption temperature on the CO 2 sorption capacity of Li 4 SiO 4 , and the sorption temperature on the CO 2 sorption capacity of LDH, were investigated. The optimal leaching acid concentration for vermiculite and the CO 2 sorption/desorption cycling performance of both the Li 4 SiO 4 and Mg-Al LDH sorbents were determined. In sum, this demonstrated a unique and environment-friendly scheme for obtaining two CO 2 sorbents from cheap raw materials, and this idea is applicable to the efficient utilization of other minerals.

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Section: Co2 Capture Performance Of Synthesized Li4sio4 and Ldh-basedmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Environmental Benign Synthesis of Lithium Silicates and Mg-Al Layered Double Hydroxide from Vermiculite Mineral for CO2 Capture

Zhou

Louis

et al. 2017

Catalysts

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“…The dust was dried in a drying oven at 378 K for 8 h. Because the combustion of carbon in the recycling dust is the major exothermic reaction, the characteristics and combustion process of the carbon must be investigated seriously. Excess 6N HCl was used to treat the recycling dust for eliminating the interference of inorganic matter [11,12]. Samples were treated until the mass fraction of ash remained lower than 5%, suggesting that the influence of inorganic matter can be ignored.…”

Section: Preparation Of Samplesmentioning

confidence: 99%

Research on the Combustion Characteristics and Kinetic Analysis of the Recycling Dust for a COREX Furnace

et al. 2017

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Thermogravimetric analysis of recycling dust (RD) from the melter gasifier of COREX, coke1 (C-1), coke2 (C-2) and coal char (CC) under 70% oxygen atmosphere was carried out using thermal balance. The chemical composition and physical structure of the samples were investigated. The characteristic temperatures and comprehensive combustion characteristic indexes were calculated and kinetic parameters during the combustion process were calculated as well using a distributed activation energy model (DAEM). The results show that the carbon in the recycling dust originates from unconsumed CC and coke fines, and the average stacking height of carbon in RD is larger than that of C-1, C-2 and CC. The conversion curves of RD are different from those of C-1, C-2 and CC, and there are two peaks in the RD conversion rate curves. The combustion profiles of RD moves to a higher temperature zone with increasing heating rates. The average activation energies of their combustion process for RD, C-1, C-2 and CC range from 191.84 kJ/mol to 128.31 kJ/mol. The activation energy for recycling dust increases as the fractional conversion increases, but the value for C-1, C-2 and CC decreases with increasing conversion, indicating different combustion mechanisms.

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“…Shan et al [7] prepared Li 4 SiO 4 -based sorbents from diatomite with fast CO 2 absorption rate. We [8] developed the Li 4 SiO 4 -based sorbents from rice husk ash (RHA)，which presented an increased kinetic behaviors compared with pure Li 4 SiO 4 . It was also reported that the calcination temperature had a great effect on the crystallinity of RHA [9], which may in turn determine the performance of Li 4 SiO 4 sorbents.…”

Section: Introductionmentioning

confidence: 99%

Effects of Calcination Temperature on the Structure and CO2 Sorption Properties of Li4SiO4 Sorbents from Rice Husk Ash

Wang¹,

Zhao²,

Zhang³

et al. 2014

Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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Abstract-Highly efficient Li 4 SiO 4 -based sorbents for CO 2 capture at high temperature, were developed using waste rice husk ash (RHA). Two different RHAS resulted from different calcination temperature as raw materials for preparing the Li 4 SiO 4 -based sorbents. These raw ashes and their resulting Li 4 SiO 4 -based sorbents were characterized by X-ray diffraction, thermogravimetry (dynamic and isothermically), and nitrogen adsorption. CO 2 sorption stability was investigated in a dual fixed-bed reactor. The characteristic results showed that high calcination temperature could lead to crystalline silica, which may produce the lower crystalline size, higher porosity and larger surface area as compared with the case of low temperature. This favourable structure appeared to be the main reason for increasing in CO 2 capture performance and kinetic behavior as illustrated by the thermogravimetric analyses. This pretreatment Li 4 SiO 4 -based sorbent also maintained a higher capacity during the multiple cycles. It was concluded that the synthesis of Li 4 SiO 4 -based sorbents obtained from biomass ash is a promising approach for CO 2 capture at high temperature.

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High temperature capture of CO2 on lithium-based sorbents from rice husk ash

Cited by 120 publications

References 38 publications

Environmental Benign Synthesis of Lithium Silicates and Mg-Al Layered Double Hydroxide from Vermiculite Mineral for CO2 Capture

Environmental Benign Synthesis of Lithium Silicates and Mg-Al Layered Double Hydroxide from Vermiculite Mineral for CO2 Capture

Research on the Combustion Characteristics and Kinetic Analysis of the Recycling Dust for a COREX Furnace

Effects of Calcination Temperature on the Structure and CO2 Sorption Properties of Li4SiO4 Sorbents from Rice Husk Ash

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