Catalytic and adsorptive desulphurization of gases

Więckowska, Jadwiga

doi:10.1016/0920-5861(95)00021-7

Cited by 129 publications

(92 citation statements)

References 1 publication

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“…Absorption including catalytic reaction using Fe +3 iron compounds [32], which are easily and at low cost available in Poland, ie the bog ore, is the most popular method presented below. As regard geological aspect, the bog ore is a low-depth deposited Quaternary mineral formerly used in iron metallurgy and building engineering.…”

Section: Biogas Desulphurization Using Bog Orementioning

confidence: 99%

Time changeability model of the bog ore sorption ability

Gaj

Cybulska-Szulc

2014

Ecological Chemistry and Engineering S

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Basing on long-standing cyclic measurements of sludge-originated biogas composition and considering statistical analysis of their results, a regression model describing time variation of biogas desulfurization using bog iron ore has been developed. The model was verified by theoretical calculations and results from laboratory examinations of the sorbent. It was also used to estimate the depletion time and sorption capacity of the bed and to determine the demand index for bog ore.

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Section: Biogas Desulphurization Using Bog Orementioning

confidence: 99%

Time changeability model of the bog ore sorption ability

Gaj

Cybulska-Szulc

2014

Ecological Chemistry and Engineering S

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“…1,2 This reaction is of high environmental interest, due to the high toxicity of H 2 S. This reaction is also interesting from an economical point of view, leading to the transformation of a hazardous compound into a more valuable one for further chemical processes. The direct oxidation of H 2 S into elemental sulfur has been developed, in order to meet ever newer and stricter legislation requirements, that the well-known modified Claus process could not reach.…”

Section: Introductionmentioning

confidence: 99%

“…1 Industrial processes and recent developments have been reported in Part I of the present paper and summarized in a series of reviews published in the literature. 2,3 Previous works showed the very high performances obtained on silicon carbide grains or extrudates (SiC) supported catalysts as compared to the literature and industrial catalysts, especially at the low temperature of 60 °C. [4][5][6][7] The H 2 S oxidation at low temperature is performed in a trickle-bed mode, the water of the inlet feed condensing at the head of the catalyst bed and trickling down through the catalyst.…”

Section: Introductionmentioning

confidence: 99%

New catalysts based on silicon carbide support for improvements in the sulfur recovery: new silicon carbide nanotubes as catalyst support for the trickle-bed H2S oxidation

Keller¹,

Vieira²,

Nhut³

et al. 2005

J. Braz. Chem. Soc.

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Nanotubos de carbeto de silício (SiC) foram preparados a partir da reação gás-sólido entre vapor de SiO e nanotubos de carbono. A fase ativa NiS 2 suportada em nanotubos de SiC apresentou maior atividade catalítica e maior capacidade de armazenamento de enxofre na reação de oxidação seletiva do H 2 S a enxofre elementar, em reator do tipo trickle-bed, que a mesma fase ativa suportada em grãos de SiC. O melhor desempenho deste catalisador foi explicado pela ocorrência do efeito de confinamento no interior dos nanotubos de SiC; ou seja, pelo aumento artificial da pressão parcial de H 2 S no interior dos nanotubos em relação à mesma pressão fora dos nanotubos, resultando assim em um aumento na taxa da oxidação, uma vez que a velocidade de reação do H 2 S é de primeira ordem. O catalisador suportado em nanotubos de SiC apresentou elevada resistência ao carregamento de enxofre devido a uma peculiar evacuação do enxofre pelo vapor de água condensado, permitindo assim uma limpeza contínua dos sítios ativos. A maior capacidade de armazenamento do enxofre sólido no suporte a base de nanotubos de SiC foi atribuído ao seu maior volume específico disponível para o armazenamento do enxofre do que o do suporte a base de grãos de SiC.Silicon carbide nanotubes were prepared via a gas-solid reaction between SiO vapor and carbon nanotubes. The NiS 2 active phase on this support displayed both a high catalytic activity and high solid sulfur storage capacity in the trickle-bed selective oxidation of H 2 S into elemental sulfur as compared to the grain-based SiC catalyst. The hypothesis of a confinement effect inside the SiC nanotubes has been put forward to explain the catalytic results. An artificial increase in the H 2 S partial pressure inside the tubes when compared to the H 2 S partial pressure outside the tubes would lead to an increase in the oxidation rate, due to the first order reaction rate toward H 2 S. The SiC nanotube supported catalyst displayed very high resistance to the sulfur loading, due to a peculiar mode of sulfur evacuation by condensed steam which allows the continuous cleaning of the active site. The high solid sulfur storage capacity was due to a much larger void volume between each SiC nanotube available for the sulfur storage, than the void volume of SiC support with a grain size morphology.

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“…Hydrogen sulfide, H 2 S(g), is a common gaseous pollutant which is colorless, odorous, highly toxic, corrosive for pipelines and poisonous for catalysts (Husein et al 2010;Nassar et al 2010;Wieckowska 1995;Rowan et al 2009;Dorman et al 2002). The world demand for sweet crude oil as well as lowering the emitted pollutants from crude oil derivatives is growing to meet international regulations.…”

Section: Introductionmentioning

confidence: 99%

Removal of H2S from crude oil via stripping followed by adsorption using ZnO/MCM-41 and optimization of parameters

Hazrati

Abdouss

Vahid³

et al. 2014

Int. J. Environ. Sci. Technol.

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In the present work, H 2 S of crude oil was removed via a two-step method including stripping followed by adsorption. First, ZnO/MCM-41 adsorbents containing 5, 17.5 and 30 wt% of zinc were synthesized and characterized using XRD and nitrogen physisorption. Then, these materials were used as adsorbents for the removal of the H 2 S stripped from crude oil. At second step, the H 2 S of crude oil was extracted to gas phase by hot stripping. The obtained extract was collected in a storage tank for the subsequent H 2 S adsorption process. A threefactor Box-Behnken design with five center points and one response was performed for the optimization of adsorption of H 2 S. The influence of process parameters and their interactional effects on the adsorption of H 2 S were analyzed using the obtained adsorption experimental data. A model including three important factors, i.e., temperature, space velocity and amount of supported zinc and their interactions, was developed to generate the optimum condition. The point of Zn = 30 wt%, T = 300°C and space velocity = 3,000 h -1 had the optimum point with the highest break point time (t bp = 973 min).

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Catalytic and adsorptive desulphurization of gases

Cited by 129 publications

References 1 publication

Time changeability model of the bog ore sorption ability

Time changeability model of the bog ore sorption ability

New catalysts based on silicon carbide support for improvements in the sulfur recovery: new silicon carbide nanotubes as catalyst support for the trickle-bed H2S oxidation

Removal of H2S from crude oil via stripping followed by adsorption using ZnO/MCM-41 and optimization of parameters

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