99/03650 Simulation of high-temperature desulfurization in a fixed-bed reactor

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.

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The W Loading Effect on SCR deNOx Performance for V-W-Mo/TiO2 Catalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.774-776.743 ◽

2013 ◽

Vol 774-776 ◽

pp. 743-746 ◽

Cited By ~ 1

Author(s):

Ji Wei Peng ◽

Tao Luan ◽

Yan Gao

Keyword(s):

High Temperature ◽

Fixed Bed ◽

Catalytic Efficiency ◽

Fixed Bed Reactor ◽

Exhaust Gas ◽

Gas Composition ◽

High Temperature Region ◽

Loading Effect ◽

Scr Catalysts ◽

Temperature Window

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.

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High-Temperature HCl Removal with Sorbents in a Fixed-Bed Reactor

Energy & Fuels ◽

10.1021/ef010294p ◽

2003 ◽

Vol 17 (4) ◽

pp. 874-878 ◽

Cited By ~ 23

Author(s):

Binlin Dou ◽

Jinsheng Gao ◽

Seung Wook Baek ◽

Xingzhong Sha

Keyword(s):

High Temperature ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Hcl Removal

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A kinetic study of gaseous potassium capture by coal minerals in a high temperature fixed-bed reactor

Fuel ◽

10.1016/j.fuel.2008.05.003 ◽

2008 ◽

Vol 87 (15-16) ◽

pp. 3304-3312 ◽

Cited By ~ 41

Author(s):

Yuanjing Zheng ◽

Peter Arendt Jensen ◽

Anker Degn Jensen

Keyword(s):

High Temperature ◽

Kinetic Study ◽

Fixed Bed ◽

Fixed Bed Reactor

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Modelling of performance of zinc ferrites as high-temperature desulfurizing sorbents in a fixed-bed reactor

Fuel ◽

10.1016/s0016-2361(97)00070-7 ◽

1997 ◽

Vol 76 (7) ◽

pp. 567-573 ◽

Cited By ~ 18

Author(s):

Miguel Pineda ◽

JoséM. Palacios ◽

Enrique García ◽

Cristina Cilleruelo ◽

JoséV. Ibarra

Keyword(s):

High Temperature ◽

Fixed Bed ◽

Fixed Bed Reactor

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High Temperature CO2 Capture by Regenerable Calcium Aluminates Carbonates Sorbents

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.779-780.56 ◽

2013 ◽

Vol 779-780 ◽

pp. 56-59

Author(s):

Ching Tsung Yu ◽

Han Wen Cheng ◽

Wei Chin Chen

Keyword(s):

High Temperature ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Economic Consideration ◽

Excellent Performance ◽

Calcium Aluminates ◽

Efficient Route ◽

The Stability ◽

Aqueous Conditions ◽

Reactive Mechanism

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.

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Deactivation Model Study of High Temperature H2S Wet-Desulfurization by Using ZnO

Energies ◽

10.3390/en14238019 ◽

2021 ◽

Vol 14 (23) ◽

pp. 8019

Author(s):

Arda Hatunoglu ◽

Alessandro Dell’Era ◽

Luca Del Zotto ◽

Andrea Di Carlo ◽

Erwin Ciro ◽

...

Keyword(s):

High Temperature ◽

Sorption Capacity ◽

Rate Constant ◽

Low Cost ◽

Fixed Bed ◽

Breakthrough Curves ◽

Fixed Bed Reactor ◽

Deactivation Model ◽

Security Issues ◽

Before And After

High-temperature desulfurization techniques are fundamental for the development of reliable and efficient conversion systems of low-cost fuels and biomass that answer to the nowadays environmental and energy security issues. This is particularly true for biomass gasification coupled to SOFC systems where the sulfur content has to be minimized before being fed to the SOFC. Thus, commercially available zinc oxide has been studied and characterized as a desulfurizing agent in a fixed-bed reactor at high temperatures from 400 °C to 600 °C. The sorbent material was characterized by XRD, BET, SEM, and EDS analyses before and after adsorption. The sorbent’s sorption capacity has been evaluated at different temperatures, as well as the breakthrough curves. Moreover, the kinetic parameters as the initial sorption rate constant k0, the deactivation rate constant kd, and the activation energy have been calculated using the linearized deactivation model. The best performances have been obtained at 550 °C, obtaining a sorption capacity of 5.4 g per 100 g of sorbent and a breakthrough time of 2.7 h. These results can be used to extend ZnO desulfurization techniques to a higher temperature than the ones used today (i.e., 550 °C with respect to 400 °C).

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Pembuatan dan uji aktivitas katalis htsc berbasis besi oksida

Jurnal Teknik Kimia Indonesia ◽

10.5614/jtki.2007.6.3.6 ◽

2018 ◽

Vol 6 (3) ◽

pp. 699

Author(s):

Fitri Rumiani ◽

S Subagjo

Keyword(s):

High Temperature ◽

Surface Area ◽

Catalyst Surface ◽

Catalyst Activity ◽

Nitrate Solution ◽

Fixed Bed ◽

Great Influence ◽

Temperature Shift ◽

Fixed Bed Reactor ◽

Preparation Procedure

High temperature shift conversion is a water gas shift reaction using water to produce carbon dioxide and hydrogen in high temperature (370-400oC). The aim of this research is examining the preparation procedure of HTSC catalyst. The catalyst made by Co-precipitation method of Fe and Cr nitrate solution with Na2CO3 as precipitating agent. The specific surface area of catalyst is determined by BET method. The crystal structure was analyzed by XRD method. The catalyst activity was evaluated in the fixed bed reactor on laboratory scale with 370oC and 1 atm. The result shows that the preparation procedure of HTSC ITB catalyst is reproducible. Based on the preparation procedure, calcinations temperature has a great influence to the catalyst surface area. The calcinations temperature at 300oC gave the highest catalyst surface area (198 m2/g), and it is comparable with the surface area claimed by Jennings (200 m2/g). The catalyst has also the highest activity by means of CO conversion resulted by the catalyst activity test (86%) which is larger than commercial catalyst conversion (81%)Keywords : Activity, Catalyst based on Fe/Cr, HTSC, Precipitation Abstrak High temperature shift conversion (HTSC) merupakan reaksi pergeseran CO menggunakan air menjadi CO2 dun H2 yang diselenggarakan pada temperatur tinggi (370-400oC). Penelitian ini bertujuan untuk mendapatkan resep dan prosedur pembuatan katalis HTSC. Katalis dibuat dengan metode kopresipitasi larutan garam nitrat dart Fe dan Cr dengan Na2CO3 sebagai senyawa pengendap. Untuk mengetahui keberhasilan penelitian ini, dilakukan penentuan luas permukaan, struktur kristal, dan aktivitas katalis yang kemudian dibandingkan dengan katalis komersial. Luas permukaan spesiftk diukur menggunakan metode BET, sedangkan struktur kristal dianalisis menggunakan XRD. Uji aktivitas katalis dilakukan dalam reaktor fixed bed skala laboratorium pada 370oC dan 1 atm. Hasil penelt.tian menunjukkan bahwa pelaksanaan prosedur pembuatan katalis HTSC ITB sudah dapat diulangi dengan hasil yang sama (reproducible). Berdasarkan prosedur tersebut, temperatur kalsinasi sangat berpengaruh terhadap lnas permukaan katalis. Dalam rentang temperatur yang dipelajari (300-400oC), kalsinasi pada temperatur 300oC menghasilkan katalis dengan luas permukaan paling tinggi yaitu 192-198 m2/g. Makin tinggi luas permukaan katalis yang dihasilkan, makin tinggi aktivitas katalis tersebut. Katalis dengan luas permukaan 192-198 m2/g menghasilkan aktivitas paling tinggi, konversi CO yang dihasilkan adalah 86 %, sedikit lebih besar dari konversi katalis komersial (81 %).Kata Kunci : Aktivitas, HTSC, Katalis berbasis Fe/Cr, Prespitasi

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