scholarly journals Tea Garden Lateritic Soil as a High-Temperature Desulfurization Sorbent: Effect of Oxygen on Regeneration Process

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Tzu-Hsing Ko ◽  
Chen-Yao Chu

The lateritic soils collected from a tea garden were used to explore the regeneration process using different O2 contents for high-temperature desulfurization. The desulfurization and regeneration experiments were carried out using a fixed-bed reactor at 500°C and the gaseous mixture composed of 1% H2S, 25% CO, 15% H2, and balance N2 for the desulfurization process. Experimental results showed that the regenerability is better when the air was used as a regeneration gas and the regeneration time is shortened. Multiple regeneration experiments indicated that lateritic soils can be regenerated by passing air and can thus be reused many times and its regeneration efficiency is slightly better than that regenerated by 1% O2. The sulfur capacity after air desulfurization/regeneration cycles was examined by elemental analysis with a value ranging from 1.40% to 1.49%, and residual sulfur was detected with a value of 0.12% after the diluted 1% O2 regeneration. No sulfur was detected for the regenerated lateritic soil after air regeneration. From NMR structural identification, the 6-coordinated octahedral structure of Al and trioctahedral coordinated Si are the major Al-containing and Si-containing compounds. Broad shoulder peaks were detected after regeneration process that may be associated with the formation of aluminosilicate and further reduces the dispersion of iron on the surface of lateritic soils.

2019 ◽  
Vol 42 (3) ◽  
pp. 655-660 ◽  
Author(s):  
Marisa De Sousa Duarte ◽  
Matthieu Rolland ◽  
Corinne Sagnard ◽  
Didier Suire ◽  
Frederic Flacher ◽  
...  

2012 ◽  
Vol 229-231 ◽  
pp. 126-129 ◽  
Author(s):  
Yan Gao ◽  
Tao Luan ◽  
Tao Lv ◽  
Hong Ming Xu

The V(1)-W(4.5)-Mo(x)/TiO2 catalysts was prepared by the incipient dry impregnation method. The catalyst samples were ground and sieved for 0.3~0.6 mm. The NO catalytic efficiency, selectivity against N2O of the catalysts were investigated on a fixed bed reactor under simulated exhaust gas with a typical gas composition. The addition of Mo enhanced the catalytic efficiency of V(1)-W(4.5)-Mo(x)/TiO2 catalysts at low temperature region, while lessened that at high temperature, especially at the temperature above 400 °C. Increasing the loading of Mo from 1.5% w/w to 4.5% w/w advanced the maximum catalytic efficiency from 78% to 99% and enlarged the temperature window of the catalyst. The acceptable NO conversion (>60%) was attained at temperature as low as 240 °C for V(1)-W(4.5)-Mo(7.5)/TiO2 catalyst. The presence of Mo promoted the N2O generation. The V(1)-W(4.5)-Mo(0)/TiO2 catalyst showed higher catalytic selectivity for NO compared to the catalysts loading Mo.


2013 ◽  
Vol 774-776 ◽  
pp. 743-746 ◽  
Author(s):  
Ji Wei Peng ◽  
Tao Luan ◽  
Yan Gao

The SCR catalysts were produced with V2O5, WO3, MoO3and anatase type TiO2. The catalyst samples were ground and sieved for 0.3~0.6mm.The NO catalytic efficiency, selectivity against N2O of the catalysts were investigated on a fixed bed reactor under simulated exhaust gas with a typical gas composition. The addition of W enhanced the catalytic efficiency of V(1)-W(x)-Mo (4.5)/TiO2catalysts at high temperature region, while lessened that at low temperature. Increasing the loading of W from 1.5% w/w to 4.5% w/w advanced the maximum catalytic efficiency from 88% to 99% and enlarged the temperature window of the catalyst. The presence of W promoted the N2O generation. The V(1)-W(4.5)-Mo (4.5)/TiO2catalyst showed higher catalytic selectivity for NO compared to the catalysts loading W.


2003 ◽  
Vol 17 (4) ◽  
pp. 874-878 ◽  
Author(s):  
Binlin Dou ◽  
Jinsheng Gao ◽  
Seung Wook Baek ◽  
Xingzhong Sha

Fuel ◽  
2008 ◽  
Vol 87 (15-16) ◽  
pp. 3304-3312 ◽  
Author(s):  
Yuanjing Zheng ◽  
Peter Arendt Jensen ◽  
Anker Degn Jensen

Fuel ◽  
1997 ◽  
Vol 76 (7) ◽  
pp. 567-573 ◽  
Author(s):  
Miguel Pineda ◽  
JoséM. Palacios ◽  
Enrique García ◽  
Cristina Cilleruelo ◽  
JoséV. Ibarra

2013 ◽  
Vol 779-780 ◽  
pp. 56-59
Author(s):  
Ching Tsung Yu ◽  
Han Wen Cheng ◽  
Wei Chin Chen

The calcium aluminates carbonates are prepared as mediumhigh temperature CO2 sorbents. The sorbent exhibited excellent performance with 53 wt% capacity and 99% stability in TGA test for 15 h. However, using the sorbent in a fixed-bed reactor, it was found that the stability rapidly decreased to about 35% after 10 cycles. Hence, development of regeneration methods for reusing this spent sorbents is critical to economic consideration toward CO2 capture technology. The calcium aluminates carbonates sorbent makes up layered structure including cations formation (Ca2+, Al3+) and lamella anions (CO32-, OH), which can be re-constructed under aqueous conditions. Aqueous hydrolysis provides an efficient route to reactive sorbent. The results showed that CO2 capacity could be recovered to around 50 wt% with 98% stability in TGA test for 15 h for spent sorbents. The reactive mechanism of sorbent is worthy to further discussing.


2014 ◽  
Vol 875-877 ◽  
pp. 1831-1836
Author(s):  
Arnoldo Emilio Delgado ◽  
Oscar F.S. Avilés ◽  
William Aperador

Currently, there are different kinds of alternative fuels called "clean fuels" within which hydrogen gas is considered. The hydrogen can be produced by various methods. The aim of this research is producing hydrogen gas by gasification of biomass in a fixed bed reactor, using a gaseous mixture with a high energy potential.


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