Sulfidation of zinc titanate and zinc oxide solids

Lew, S.; Sarofim, Adel F.; Flytzani‐Stephanopoulos, Maria

doi:10.1021/ie00008a009

Cited by 111 publications

(101 citation statements)

References 10 publications

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“…A major limitation of ZnO-based sorbents for hot gas desulfurization is sorbent loss due to the reduction of zinc oxide to volatile elemental zinc. We have found that zinc-titanium-oxide solids are much more resistive to reduction by H2 than ZnO (Lew, 1990;Lew et al, 1989;1992a). The initial sulfidation rate of Zn-Ti-0 solids was approximately half that of ZnO (Lew, 1990;Lew et al, 1992b).…”

Section: Introductionmentioning

confidence: 68%

“…We have found that zinc-titanium-oxide solids are much more resistive to reduction by H2 than ZnO (Lew, 1990;Lew et al, 1989;1992a). The initial sulfidation rate of Zn-Ti-0 solids was approximately half that of ZnO (Lew, 1990;Lew et al, 1992b). In this article, we examine the product layer Correspondence concerning this article should be addressed to M. Flytzani-Stephanopoulos.…”

Section: Introductionmentioning

confidence: 92%

“…We have recently conducted an extensive experimental study of the sulfidation kinetics of Zn-Ti-0 and ZnO sorbents with H2S-H20-H2-N2 gas mixtures in a thermogravimetric apparatus (Lew, 1990;Lew et al, 1991;1992b). The scanning electron micrographs of these solids show a consistent picture of overlapping grains.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of the sulfidation of zinc‐titanium oxide sorbents with hydrogen sulfide

Lew¹,

Sarofim²,

Flytzani‐Stephanopoulos³

1992

AIChE Journal

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 92%

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Modeling of the sulfidation of zinc‐titanium oxide sorbents with hydrogen sulfide

Lew¹,

Sarofim²,

Flytzani‐Stephanopoulos³

1992

AIChE Journal

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“…The oxides of Zn, Fe, Ca, Mn and Co as H 2 S sorbents for HTGD are investigated extensively nowadays [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve the performance, ZnO sorbents mixed with many metal oxides have been evaluated [24][25][26][27]. CeO 2 as one of the most promising rare earths has an outstanding oxygen storage capacity and improve the performance of ZnO sorbents for desulfurization [11,[28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The Effects of CeO2 Addition on the Performance of Zinc Oxide Sorbent Prepared by Microwave Solid-State Method for H2S Removal

Su¹,

Wu²,

Li³

et al. 2015

Proceedings of the 2015 International Symposium on Energy Science and Chemical Engineering

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Abstract. ZnO sorbents with different CeO 2 loadings were prepared by microwave calcination and tested the performance for H 2 S removal in a fixed-bed reactor at 500 . The results r ℃ evealed that the Ce-doped sorbents have a higher efficiency and longer breakthrough time compared with non-modified sorbents. The optimal sulfur capacity (13.03 gS/100 g) and breakthrough time (17.5 h) were obtained when the content of CeO 2 up to 4 wt.%. XRD, SEM, XPS and mercury porosimetry methods were used to characterize the structure of sorbents. Analysis data indicated that the addition of CeO 2 leads to better pore structure and larger specific surface, which facilitates the diffusion of H 2 S into the active sites. Furthermore, the presence of CeO 2 also results in an increase in the content of surface elements including Zn and O, which contributes to improve the ability of H 2 S removal. IntroductionThe integrated coal gasification combined cycle (IGCC) process is considered as one of the promising clean coal technologies in the 21st century [1][2][3], meanwhile the high temperature gas desulfurization (HTGD) was regarded as one of the key techniques in the IGCC system [2][3][4][5][6][7]. The oxides of Zn, Fe, Ca, Mn and Co as H 2 S sorbents for HTGD are investigated extensively nowadays [7][8][9][10][11][12][13].Among these sorbents, Zinc oxide sorbents are considered to be the most promising material for HTGD because of its large sulfur capacity and excellent desulfurization thermodynamics [7,14,15]. Up to now, many synthesis methods have been investigated [16][17][18][19][20]. In comparison with traditional preparation methods, microwave irradiation is a burgeoning method to prepare desulfurizer by virtue of it can provide a rapid drying and evenly heating [21]. The advantages of microwave heating over conventional heating have been studied in our previous work [22].But under the condition of high temperature, the ZnO sorbents would evaporate thus limit its development [7,23]. Moreover, single ZnO sorbents show many disadvantages such as decrease of sorbent efficiency and degradation of the mechanical properties [24]. In order to improve the performance, ZnO sorbents mixed with many metal oxides have been evaluated [24][25][26][27]. CeO 2 as one of the most promising rare earths has an outstanding oxygen storage capacity and improve the performance of ZnO sorbents for desulfurization [11,[28][29][30].In this paper, the performance of ZnO based sorbents doped with various content of CeO 2 employed for high temperature coal gas desulfurization were studied. Also, the effects of the amount of CeO 2 loaded to the sorbents on the performance for H 2 S removal were studied. The analysis data of structure and textural properties were provided by XRD, XPS, SEM and mercury porosimetry.

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Catalysts and Sorbents for Thermochemical Conversion of Biomass to Renewable Biofuels—Material Development Needs

Cheah

Czernik

Baldwin

et al. 2010

Ceramic Transactions Series

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Sulfidation of zinc titanate and zinc oxide solids

Cited by 111 publications

References 10 publications

Modeling of the sulfidation of zinc‐titanium oxide sorbents with hydrogen sulfide

Modeling of the sulfidation of zinc‐titanium oxide sorbents with hydrogen sulfide

The Effects of CeO2 Addition on the Performance of Zinc Oxide Sorbent Prepared by Microwave Solid-State Method for H2S Removal

Catalysts and Sorbents for Thermochemical Conversion of Biomass to Renewable Biofuels—Material Development Needs

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