Cobalt-zinc oxide absorbents for low temperature gas desulfurisation

Baird, T.; Campbell, Kenneth C.; Holliman, Peter J.; Hoyle, Robert; Huxam, Max; Stirling, Diane; Williams, B. Peter; Morris, Michael A.

doi:10.1039/a806909c

Cited by 64 publications

(55 citation statements)

References 12 publications

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“…At 22°C, the breakthrough capacity and saturation capacity of PEI(50)/SBA-15 were 0.79 and 1.98 mmol-H 2 S/g-sorb, respectively, which were about 20 times as large as those at 75°C (0.037 and 0.11 mmol-H 2 S/g-sorb, respectively). This saturation capacity is significantly higher than that reported in literature for the amine-grafted MCM-48 adsorbent [31] and is in the same magnitude as those reported for the mixed metal oxides [13,[15][16][17][18][19][20] at the comparable sorption temperature. In our previous study, it was also found that for the sorption of CO 2 on a PEI/MCM-41 sorbent, the sorption capacity increased with increasing temperatures from 50 to 75°C and then, decreased with continuous increase in temperatures [26].…”

Section: Effect Of Sorption Temperaturesupporting

confidence: 60%

“…In the range of 25-100°C, Carnes and Klabunde [13] found the activity of nanocrystalline metal oxides prepared by a sol-gel method decreased in the order of ZnO [ CaO [ Al 2 O 3 [ MgO. In order to improve the adsorption capacity at low temperature, many metal oxides have been tested and investigated, which includes ferric oxyhydroxides (FeOOH) [14], iron, copper, and cobalt doped zinc oxide [15], cobalt-zinc-aluminum oxides [16], iron-zinc and iron-cobalt mixed oxides [17,18], and Zn-Ti-based oxides [19,20]. However, the regeneration of the spent metal-oxide-based sorbents needs to be conducted usually at high temperature ([450°C) in the presence of O 2 .…”

Section: Introductionmentioning

confidence: 99%

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Mesoporous-molecular-sieve-supported Polymer Sorbents for Removing H2S from Hydrogen Gas Streams

Wang

et al. 2008

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A series of sorbents with a linear polyethylenimine (PEI) supported on the mesoporous molecular sieves, including MCM-41, MCM-48 and SBA-15, have been prepared and used to remove H 2 S from a model gas containing 0.40 v% of H 2 S and 20 v% H 2 in N 2 gas. The sorption was conducted in a fixed-bed system at a temperature range of 22-75°C, a GHSV range of 337-1,011 h -1 and atmospheric pressure. The effects of the operating temperature, GHSV, the amount of PEI loading and the different molecular sieve supports were studied. A reduction in the temperature and GHSV improves the sorption performance of the supported PEI sorbents. A synergetic effect of the SBA-15 support and PEI on the H 2 S sorption performance was observed. Loading 50 wt% PEI on SBA-15 gave the best breakthrough capacity, while loading 65 wt% PEI on SBA-15 had the highest saturation capacity. The mesoporous molecular sieve with large pore size and three-dimensional channel structure favors increasing the kinetic capacity of the supported PEI sorbent. In addition, the developed sorbents can be regenerated easily at mild conditions (temperature range of 75-100°C) and have excellent regenerability and stability. The results indicate that the mesoporous-molecular-sieve-supported polymer sorbents are promising for removing H 2 S from hydrogen gas streams.

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Section: Effect Of Sorption Temperaturesupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Mesoporous-molecular-sieve-supported Polymer Sorbents for Removing H2S from Hydrogen Gas Streams

Wang

et al. 2008

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“…It is reported that the Fe, Mn, Cu, Zn, and Co have the favorable thermodynamic property for high-temperature desulfurization [3][4][5][6]. In the past, we have investigated a great number of soil samples for hightemperature desulfurization, and some important information was proposed [10,11].…”

Section: Resultsmentioning

confidence: 99%

“…One of the crucial criteria in the development of the HGD for IGCC and SOFC is the need for a high sulfur capacity, low overall cost, high utilization, eco-friendly, and regenerable sorbent [1,2]. Based on the investigation of previous studies, Fe, Cu, Zn, Mn, V, and Co oxides have been paid much attention because of their thermodynamic feasibility, reactivity, and regeneration property [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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

Chu

2018

Journal of Chemistry

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e lateritic soils collected from a tea garden were used to explore the regeneration process using different O 2 contents for hightemperature desulfurization. e desulfurization and regeneration experiments were carried out using a fixed-bed reactor at 500°C and the gaseous mixture composed of 1% H 2 S, 25% CO, 15% H 2 , and balance N 2 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% O 2 .e 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% O 2 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.

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“…This compound was proposed [2] as a promising anode material for lithium current sources. Solid solutions of Zn x Co 3-x O 4 tested in [3] displayed the highest efficiency as absorbents of hydrogen sulphide at low temperatures.…”

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confidence: 98%

Magnetic properties of Zn_0.7Co_2.3O₄₊δ spinel prepared by thermal decomposition of binary oxalates in air

Базуев

Гырдасова

2008

Physica Status Solidi (b)

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Magnetization and ac susceptibility of two Zn0.7Co2.3O4+δ spinel specimens obtained by decomposition of the binary oxalate Znx Co1–x C2O4·2H2O in air were measured in the temperature range 2–300 K. It is shown that the complex oxide Zn0.7Co2.3O4+δ formed right after the decomposition of the oxalate (at 220 °C) contains about 0.002 mass% metal cobalt, which is responsible for the dependence of the magnetic susceptibility χ on magnetic field at 300 K. Below 100 K, the χ = f (T) dependence of this specimen is characterized by divergence between curves measured under ZFC and FC conditions and a magnetic hysteresis loop at 2 K. The specimen synthesized at 700 °C does not contain a ferromagnetic component and is paramagnetic in the temperature interval 2–300 K. The observed differences in magnetic properties are explained by a higher degree of oxidation of cobalt and the nanodimensional state of the compound formed at a lower temperature. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Cobalt-zinc oxide absorbents for low temperature gas desulfurisation

Cited by 64 publications

References 12 publications

Mesoporous-molecular-sieve-supported Polymer Sorbents for Removing H2S from Hydrogen Gas Streams

Mesoporous-molecular-sieve-supported Polymer Sorbents for Removing H2S from Hydrogen Gas Streams

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

Magnetic properties of Zn_0.7Co_2.3O₄₊δ spinel prepared by thermal decomposition of binary oxalates in air

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Cobalt-zinc oxide absorbents for low temperature gas desulfurisation

Cited by 64 publications

References 12 publications

Mesoporous-molecular-sieve-supported Polymer Sorbents for Removing H2S from Hydrogen Gas Streams

Mesoporous-molecular-sieve-supported Polymer Sorbents for Removing H2S from Hydrogen Gas Streams

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

Magnetic properties of Zn0.7Co2.3O4+δ spinel prepared by thermal decomposition of binary oxalates in air

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Magnetic properties of Zn_0.7Co_2.3O₄₊δ spinel prepared by thermal decomposition of binary oxalates in air