Effects of pore structure on the performance of coal gas desulfurization sorbents

Efthimiadis, Evangelos A.; Sotirchos, Stratis V.

doi:10.1016/0009-2509(93)80075-2

Cited by 31 publications

(37 citation statements)

References 21 publications

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“…Moreover, when samples of the two batches were sulfided under identical reaction conditions, the conversion vs. time curves were within experimental error identical. A detailed investigation of the pore structure of unreacted sorbents G-72D and C7-2 and their sulfides was carried out in another study by Efthimiadis and Sotirchos (1992b).…”

Section: Methodsmentioning

confidence: 99%

“…As the results of Table 1 show, sample G-72D has less pore volume per unit mass and smaller most probable radius than sample C7-2. Moreover, it was found from the analysis of the single 0.5 particle sulfidation data that the effective diffusivity of H2S in its pore space is smaller and decreases faster with the conversion than that in sample C7-2 (Efthimiadis and Sotirchos, 1992b).…”

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confidence: 97%

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Experimental validation of a mathematical model for fixed‐bed desulfurization

Efthimiadis

Sotirchos

1993

AIChE Journal

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Porous particles of two commercially available ZnO sorbents differing in porosity, surface area, and pore-size distribution were reacted with H2S at 500 and 600°C in a fixed-bed reactor. Concentration breakthrough curves were determined by analyzing the effluent of the reactor using a gas chromotograph equipped with thermal conductivity and flame photometric detectors. The pore structure of samples collected from different positions in the reactor was analyzed by mercury porosimetry and gas adsorption to determine the variation of the average structural properties of the sorbent with the length of the reactor. The obtained experimental data were used to validate a fixed-bed desulfurization model, which employs detailedsubmodels for diffusion, reaction, and structure evolution in the porous sorbent particles. With the various parameters appearing in the submodels determined from independent thermogravimetric reactivity evolution experiments, the fmed-bed desulfurization model was found to be capable of providing an excellent description of the behavior of the desulfurization sorbents in a fixed-bed reactor.

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Section: Methodsmentioning

confidence: 99%

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confidence: 97%

Experimental validation of a mathematical model for fixed‐bed desulfurization

Efthimiadis

Sotirchos

1993

AIChE Journal

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“…In general, the achieved capacity is near 25 mass% [76]. The sulfur removal rate is also depending on the characteristics of the sorbent: its textural properties, porosity and specific surface area [68,70,77,78]. Moreover, the presence of H 2 O, CO and CO 2 in the gas may influence the absorption of H 2 S on ZnO: -given the equilibrium reaction, presence of H 2 O in the gas may affect the desulfurization performance of the trap [61,76].…”

Section: H 2 S Removalmentioning

confidence: 99%

“…for ZnO for which abundant literature can be found. The sulfidation profile of ZnO pellets has been modeled according to shrinking core type mechanisms [68][69][70]. Studies on ZnO crystals sulfidation show outward growth of ZnS phase, with Zn diffusion through the resulting sulfide layer according to Kirkendall effect [71][72][73].…”

Section: H 2 S Removalmentioning

confidence: 99%

Synthesis Gas Purification

Chiche

Diverchy

Lucquin

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Purification des gaz de synthe`se -Les proce´de´s de synthe`se de biocarburants par voie Fischer-Tropsch (FT), voies B-XTL, repre´sentent des alternatives prometteuses pour la production d'e´nergie. Ces proce´de´s permettent la conversion en carburants de synthe`se de biomasse lignocellulosique, e´ventuellement mise en oeuvre en me´lange avec des charges fossiles telles que petcoke, charbons ou re´sidus sous vide. Pour ce faire, une e´tape de gaze´ification convertit la charge carbone´e en un gaz de synthe`se (me´lange de CO et H 2 ), lequel, apre`s ajustement du ratio H 2 /CO et e´limination du CO 2 , subit ensuite la re´action de FischerTropsch. Les gaz de synthe`se contiennent cependant de nombreuses impurete´s qui ne´cessitent d'eˆtre e´limine´es afin d'e´viter l'empoisonnement des catalyseurs Fischer-Tropsch. En raison de la grande varie´te´de charges pouvant eˆtre mises en oeuvre, la composition des gaz de synthe`se est susceptible de subir d'importantes variations, en particulier de part la nature des impurete´s (e´le´ments, spe´ciation) pre´sentes ainsi que leurs teneurs relatives. La composition des gaz de synthe`se est e´galement soumise a`des spe´cifications extreˆmement se´ve`res en terme de purete´lie´es a`l'importante sensibilite´aux poisons des catalyseurs FT. Pour ces raisons, la purification des gaz de synthe`se constitue un de´fi majeur pour le de´veloppement des proce´de´s B-XTL. Dans cet article, nous pre´sentons les principaux enjeux lie´s a`la purification des gaz de synthe`se. Les diffe´rents types d'impurete´s pouvant eˆtre pre´sentes dans les gaz de synthe`se sont pre´sente´es. L'influence de la nature de la charge, des technologies de gaze´ification ainsi que des conditions ope´ratoires associe´es sur la nature des impurete´s et leurs teneurs relatives est discute´e. Une attention particulie`re est porte´e au devenir des compose´s soufre´s, azote´s, des haloge`nes, me´taux lourds et me´taux de transition. Les principales technologies de purification des gaz de synthe`se (adsorption, absorption, re´actions catalytiques, etc.) sont finalement de´crites, ainsi que les de´fis associe´s.Abstract -Synthesis Gas Purification -Fischer-Tropsch (FT) based B-XTL processes are attractive alternatives for future energy production. These processes aim at converting lignocellulosic biomass possibly in co-processing with petcoke, coal, or vacuum residues into synthetic biofuels. A gasification step converts the feed into a synthesis gas (CO and H 2 mixture), which undergoes the Fischer-Tropsch reaction after H 2 /CO ratio adjustment and CO 2 removal. However synthesis gas also contains various impurities that must be removed in order to prevent Fischer-Tropsch catalyst poisoning. Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 68 (2013), No. 4, pp. 707-723 Copyright Ó 2013, IFP Energies nouvelles DOI: 10.2516 Due to the large feedstocks variety that can be processed, significant variations of the composition of the synthesis gas are expected. Especially, this affects the ...

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“…During the decomposition of metal oxalates, the release of carbon oxides plays a role of pore former, resulting in a substantial increase in pore structure along with large specific surface area and pore volume, which are beneficial to the dispersion of active component in the preparation of desulfurizer, and this is why the method was chosen in this study [14]. As for the preparation of FeC 2 O 4 Á2H 2 O, compared with liquid-state reactions, the solid-state method has the advantages of flexibility of operation and simple technique such as no need of solvents, almost no pollution, high yields, low energy consumption and lower temperature [15,16].…”

Section: Introductionmentioning

confidence: 99%

Non-isothermal decomposition kinetics of FeC2O4·2H2O prepared by solid-state method aiming at the formation of Fe2O3

Feng

et al. 2015

J Therm Anal Calorim

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The thermal decomposition of FeC 2 O 4 Á2H 2 O prepared by solid-state method was investigated in air using TG-DTG/DSC. The precursor and its decomposition products formed at various temperatures were characterized by FT-IR and XRD. As evidenced by the results, the thermal decomposition proceeds in two steps with DSC peaks closely corresponding to the mass loss. The decomposition of FeC 2 O 4 Á2H 2 O and the kinetic analysis of the second step were performed under non-isothermal conditions, and the activation energies were estimated by the Ozawa integral method and the Coats-Redfern integral method. In order to make the kinetic calculation much more accurate, the temperature was risen by variable acceleration in the different stages of the decomposition to help distinguish the two steps from each other, and this is an innovation point that is deserved to be mentioned in this study. After calculation and comparison, the decomposition conforms to the nucleation and growth model and the physical interpretation is summarized. The activation energy and kinetic mechanism function were determined to be 113.90 kJ mol -1 and G(a) = [-ln(1 -a)] 2/3 , respectively.

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Effects of pore structure on the performance of coal gas desulfurization sorbents

Cited by 31 publications

References 21 publications

Experimental validation of a mathematical model for fixed‐bed desulfurization

Experimental validation of a mathematical model for fixed‐bed desulfurization

Synthesis Gas Purification

Non-isothermal decomposition kinetics of FeC2O4·2H2O prepared by solid-state method aiming at the formation of Fe2O3

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