Hot desulfurization of coal gas with copper

Sick, Georg; Schwerdtfeger, Klaus

doi:10.1007/bf02654274

Cited by 17 publications

(12 citation statements)

References 10 publications

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“…Sick et al 52 reported the formation of dense onion-like sulfide layers during CuO sulfidation which dramatically increase solid diffusion resistance by lower values of effective solid phase diffusivities. Increasing crystallite size would require the formation of a thicker outer sulfide layer to achieve the same conversion as a smaller sized crystallite.…”

Section: Fp-3mentioning

confidence: 99%

Effects of Morphology and Surface Properties of Copper Oxide on the Removal of Hydrogen Sulfide from Gaseous Streams

Azzam

Alshafei

López-Ausens

et al. 2019

Ind. Eng. Chem. Res.

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This work studies the effects of microscopic shape, crystallinity, and purity for the chemical reaction of CuO nanoparticles with hydrogen sulfide (H 2 S) to form copper sulfide. Several CuO nanomaterials were prepared via various synthesis techniques, including sol-gel, precipitation, hydrothermal synthesis in the presence of a polymer/surfactant, hydrolysis, and electrospinning, using different copper precursors (nitrate and acetate) and thermal treatment conditions (623 to 1023 K). The synthesized materials, which had different morphologies (flower-like, nanobelt-like, petal-like, spherical, and nanofibers) and physiochemical chemical properties (e.g., crystallite size, surface area and pore volume), were tested for their performance as low-temperature H 2 S sorbents in fixed-bed experiments at 294 K and 1 atm. Despite ostensible differences between the various properties of the tested sorbents, a strong linear relationship was recognized between the sorbents' sulfur removal capacity and crystallite size, independent of changes in the materials' microscopic shape and porosity. Specifically, it was observed that CuO materials with crystallite sizes larger than 26 nm exhibited low sulfur uptake capacities (less than 0.5 wt%) whereas capacity increased linearly (from 0.5 wt% to 12 wt%) with decreasing crystallite sizes for materials with CuO crystallites from 26 nm to 5 nm. In addition, the effect of residual carbon on CuO surfaces was also probed in this study, for the first time, showing that amorphous carbon inherently imparted by the use of a polymer, Polyvinylpyrrolidone (PVP) or poly(ethylene oxide) (PEO), or a surfactant, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (P123), in the synthesis procedure inhibits reaction and deleteriously impacts the H 2 S uptake capacity. This trend demonstrates that sorption capacity is strongly influenced by crystallite size and is independent of microscopic shape, surface area and mesopore structure. First principles atomistic simulations explain which surface O anions are most reactive and supportive to the observations.

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Section: Fp-3mentioning

confidence: 99%

Effects of Morphology and Surface Properties of Copper Oxide on the Removal of Hydrogen Sulfide from Gaseous Streams

Azzam

Alshafei

López-Ausens

et al. 2019

Ind. Eng. Chem. Res.

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“…8 and 9 34, and metallic Cu adsorbs H 2 S according to Eq. 10 16.

true 3 normalCuO + {normalH}_{2} normalS ⇌ 3 normalCu + normalS {normalO}_{2} + {normalH}_{2} normalO

true 3 normalC {normalu}_{2} normalO + {normalH}_{2} normalS ⇌ 6 normalCu + normalS {normalO}_{2} + {normalH}_{2} normalO

true 2 normalCu + {normalH}_{2} normalS ⇌ normalC {normalu}_{2} normalS + {normalH}_{2}

…”

Section: Resultsmentioning

confidence: 99%

“…Significant SO 2 formation was observed at the beginning of the sorptions at all temperatures, but this decreased rapidly to stable low levels after around 5 min. The main compound on the support of the sorbent 15Fe, according to the XRD patterns, was Fe 2 O 3 , which can be reduced to FeO under the reducing environment [16].…”

Section: Residual Sulfur Concentrations On Fe-based Sorbentmentioning

confidence: 99%

“…Thermodynamic calculations suggested that copper, zinc, and manganese oxides are favorable for H 2 S removal at temperatures lower than 650°C and can reduce the H 2 S concentration to sub-ppm level [12]. However, the reported experimental data for the residual H 2 S concentration were divergent, varying from 1 ppm [13][14][15] up to several hundred ppm [16]. Furthermore, some measurements were restricted by the instrument limitations so that the sulfur residual could not be precisely detected.…”

Section: Introductionmentioning

confidence: 99%

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Regenerable Sorbents for High‐Temperature Desulfurization of Syngas from Biomass Gasification

Mahmoodinia

Rout

et al. 2021

Chemie Ingenieur Technik

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Single-metal high-temperature solid sorbents for syngas cleaning using Mn, Ca, Fe, Cu, or Mo supported on g-Al 2 O 3 were synthesized, characterized, and tested in a fixed-bed reactor. H 2 S and SO 2 concentrations in the gas after treatment at T = 400 to 700°C were compared with thermodynamic calculations. The Mn-based sorbent showed the best ability to achieve a low sulfur residual in the gas, especially at temperatures above 600°C. Sorbents with Fe, Cu, and Mo gave SO 2 formation in the initial phase, but this could be avoided by a pre-reduction treatment of the sorbent material.

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“…It can not only improve thermal efficiency, but also reduce equipment cost without gas cooling and reheating processes compared with the conventional wet desulfurization. So far, various single and mixed metal oxide sorbents prepared by different methods were studied for hot coal gas desulfurization, [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] such as oxides of iron, manganese, zinc, copper, cerium, calcium, and cobalt. In view of deep desulfurization, zinc oxide is regarded as the most attractive candidate sorbent owing to its high precision and good thermal stability for H 2 S removal.…”

Section: Introductionmentioning

confidence: 99%

Effect of lignite as support precursor on deep desulfurization performance of semicoke supported zinc oxide sorbent in hot coal gas

Ren

Bao

et al. 2020

RSC Adv.

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Hot desulfurization of coal gas with copper

Cited by 17 publications

References 10 publications

Effects of Morphology and Surface Properties of Copper Oxide on the Removal of Hydrogen Sulfide from Gaseous Streams

Effects of Morphology and Surface Properties of Copper Oxide on the Removal of Hydrogen Sulfide from Gaseous Streams

Regenerable Sorbents for High‐Temperature Desulfurization of Syngas from Biomass Gasification

Effect of lignite as support precursor on deep desulfurization performance of semicoke supported zinc oxide sorbent in hot coal gas

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