Novel Fe–Mn–Zn–Ti–O mixed-metal oxides for the low-temperature removal of H2S from gas streams in the presence of H2, CO2, and H2O

Polychronopoulou, Kyriaki; Galisteo, F. Cabello; Granados, M. Lòpez; Fierro, J. L. G.; Bakas, Thomas; Efstathiou, Angelos M.

doi:10.1016/j.jcat.2005.10.001

Cited by 72 publications

(63 citation statements)

References 67 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: 68%

“…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: 68%

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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“…7,8 Application of H 2 /CO 2 in bioreactors also imposes the problem of excess H 2 which may be required to be processed by CHC and generation as well removal of H 2 S depends upon the H 2 content and state of the catalyst/adsorbent which is reported to be influenced by the presence of H 2 . 9,10 Another important application for CHC is for treatment of exhaust gases from fuel processors/gas turbines, and outlet streams from reactors that operate with excess H 2 . A detailed description for CHC in different systems and its importance can be found in our previous studies.…”

Section: Introductionmentioning

confidence: 99%

Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations

2011

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) were tested for catalytic hydrogen combustion. The compounds were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. All the four compounds showed good activity and stability for catalytic hydrogen combustion and more than 95% conversion was observed over all the compounds within 500 C. The mechanisms for the reaction over the different classes of compounds (cerium-based and iron-based compounds) were proposed on the basis of spectroscopic observations. The main difference in the mechanisms was in the nature of adsorption of H 2 over the sites. The elementary processes for the reaction were proposed, corresponding rate expressions were derived, and the rate parameters for the reaction were estimated using nonlinear regression. Langmuir-Hinshelwood and Eley-Rideal mechanisms were also tested for the reaction and the proposed mechanism was compared with these mechanisms. V V C 2011 American Institute of Chemical Engineers AIChE J, 58: 932-945, 2012

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“…H 2 S could cause the catalyst of chemical process poisoned, the engine of natural gas vehicles corroded, and environment pollution when natural gas or coalbed methane is burned. Therefore, the purification of natural gas becomes more and more important [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

PSS sorbents for removing trace hydrogen sulfide in methane

Zhong

Zhou

2011

Front. Chem. Sci. Eng.

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Sorbents of the pressure swing sorption process (PSS) to remove trace amount of H 2 S (190 ppm) contained in methane were experimentally studied. The sorbents consist of adsorbent carrier (silica gel or activated carbon) and absorbent which spreads outside the carrier granules' pores (triethanolamine, TEA or N-methyl-2-pyrrolidone, NMP). The results of breakthrough and regeneration tests show that silica gel is more suitable to be the carrier than activated carbon and TEA is more suitable to be the absorbent than NMP. The loaded absorbent could enlarge the sorption capacity of H 2 S considerably. And the BET tests indicate that the absorbent deposits on the surface of the carrier's pores and can reduce the mesopores' size and block the micropores.

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Novel Fe–Mn–Zn–Ti–O mixed-metal oxides for the low-temperature removal of H2S from gas streams in the presence of H2, CO2, and H2O

Cited by 72 publications

References 67 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

Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations

PSS sorbents for removing trace hydrogen sulfide in methane

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