Mixed Co–Zn–Al oxides as absorbents for low-temperature gas desulfurisation

Baird, T.; Campbell, Kenneth C.; Holliman, Peter J.; Hoyle, Robert; Stirling, Diane; Williams, B. Peter

doi:10.1039/ft9959103219

Cited by 44 publications

(35 citation statements)

References 19 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: 98%

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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: 98%

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

Wang

et al. 2008

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“…For adsorptive separations, one of the main challenges for selective H 2 S removal from sour gas is the presence of H 2 O vapor because H 2 O, with its higher dipole, has a higher affinity for strong adsorption sites. Selectivity can be achieved through a chemical reaction, but this leads to an inherently energy‐intensive separation . Siliceous zeolites (high Si/Al ratio) containing only minute quantities of polar cations and silanol defects are very hydrophobic, and offer an opportunity to selectively capture H 2 S from moist natural gas …”

Section: Figurementioning

confidence: 99%

Identifying Optimal Zeolitic Sorbents for Sweetening of Highly Sour Natural Gas

2016

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Raw natural gas is a complex mixture comprising methane, ethane, other hydrocarbons, hydrogen sulfide, carbon dioxide, nitrogen, and water. For sour gas fields, selective and energy‐efficient removal of H2S is one of the crucial challenges facing the natural‐gas industry. Separation using nanoporous materials, such as zeolites, can be an alternative to energy‐intensive amine‐based absorption processes. Herein, the adsorption of binary H2S/CH4 and H2S/C2H6 mixtures in the all‐silica forms of 386 zeolitic frameworks is investigated using Monte Carlo simulations. Adsorption of a five‐component mixture is utilized to evaluate the performance of the 16 most promising materials under close‐to‐real conditions. It is found that depending on the fractions of CH4, C2H6, and CO2, different sorbents allow for optimal H2S removal and hydrocarbon recovery.

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“…From these results it is evident that these experimental conditions would result in a very long exposure duration (approximately oxide which gives improved performance [15]. In Glasgow, a number of mixed metal carbonates and their oxides (formed on decomposition of the carbonates) have been synthesized and tested in a flow line similar to the one described below (' Absorbent testing') for their ability to absorb H 2 S. Cobaltbased materials have been found to be particularly effective, with the best materials reacting stoichiometrically with H 2 S at room temperature [16]. Detailed characterization of all the materials tested showed that H 2 S uptake is dependent on a number of factors, including the absorbent morphology, surface area, porosity, and the metal ions used.…”

Section: Assessment Of Film Permeabilitymentioning

confidence: 99%

The protection of silver collections from tarnishing

Ankersmit¹,

Noble²,

Ridge³

et al. 2000

Studies in Conservation

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An integrated project with the objective of reducing the tarnishing of silver in muse.um collections has three research components: (I) to develop, validate and deploy passive samplers for the quantification of the relevant pollutant gases (hydrogen sulphide, H 2 S, and carbonyl sulphide, OCS); (2) to identify and evaluate suitable transparent polymer systems which can provide effective sealed pouches for storage of silver;(3) to synthesize, characterize and test new absorbents to remove these pollutant gases from showcases. Passive samplers for H2S and OCS gases have been developed and both have undergone laboratory validation. The passive sampler for H2S has been deployed in four museums in The Netherlands; the H2S concentrations span the range 0-1000 parts per trillion and show considerable variation depending on the season and the site. A standard method has been developed for the preparation of silver test coupons for assessing the development of silver tarnish in laboratory experiments and in museum display cases. Novel absorbents have been synthesized, characterized and tested for their efficacy in removing H2S pollution from museum showcases. The absorbents were considerably more effective at H2S removal than commercial absorbents tested under the same laboratory conditions. A range of commercial polymer films has been selected, on the basis of their specified low permeability to oxygen, for evaluation as H2S barriers, and preliminary laboratory permeability studies have been carried out.

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Mixed Co–Zn–Al oxides as absorbents for low-temperature gas desulfurisation

Cited by 44 publications

References 19 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

Identifying Optimal Zeolitic Sorbents for Sweetening of Highly Sour Natural Gas

The protection of silver collections from tarnishing

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