Attrition-resistant zinc titanate sorbent for sulfur

Swisher, J. H.

doi:10.1016/0140-6701(96)88519-5

Cited by 12 publications

(18 citation statements)

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“…Zinc titanates, such as ZnTiO 3 and Zn 2 TiO 4 , are attractive as sorbents for removing sulfur from hot coal gasification products [9,10], pigments [11], and gas sensors for ethanol, NO and CO [12]. Due to the recent progress of microwave applications in the area of mobile telephones and satellite communications, these substances can also be used as dielectric resonators and fitters [13,14].…”

Section: Introductionmentioning

confidence: 99%

Formation and Morphology of Zn2Ti3O8 Powders Using Hydrothermal Process without Dispersant Agent or Mineralizer

Wang

Hwang

Chang

et al. 2011

IJMS

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Synthesis of Zn2Ti3O8 powders for attenuating UVA using TiCl4, Zn(NO3)2·6H2O and NH4OH as precursor materials by hydrothermal process has been investigated. The X-ray diffractometry (XRD) results show the phases of ZnO, anatase TiO2 and Zn2Ti3O8 coexisted when the zinc titanate powders were calcined at 600 °C for 1 h. When calcined at 900 °C for 1 h, the XRD results reveal the existence of ZnO, Zn2TiO4, rutile TiO2 and ZnTiO3. Scanning electron microscope (SEM) observations show extensive large agglomeration in the samples. Transmission electron microscope (TEM) and electron diffraction (ED) examination results indicate that ZnTiO3 crystallites formed with a size of about 5 nm on the matrix of plate-like ZnO when calcined at 700 °C for 1 h. The calcination samples have acceptable absorbance at a wavelength of 400 nm, indicating that the zinc titanate precursor powders calcined at 700 °C for 1 h can be used as an UVA-attenuating agent.

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Section: Introductionmentioning

confidence: 99%

Formation and Morphology of Zn2Ti3O8 Powders Using Hydrothermal Process without Dispersant Agent or Mineralizer

Wang

Hwang

Chang

et al. 2011

IJMS

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“…Zinc titanates have been used as white color pigments and catalysts for the desulphutization of hot coal gases [1,2]. In the last few decades, these materials have also been used as dielectric materials for microwave devices and, more preferably, for low-temperature co-fired ceramics (LTCC) [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Mixtures of ZnO, TiO 2 , and MgO (0, 1.25,and 2.5%) are mechanically activated for 15 min in a planetary ball mill. Nonisothermal sintering is performed in air for 120 min at 800, 900, 1000, and 1100°C.…”

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confidence: 99%

Analysis of nonisothermal sintering of zinc-titanate ceramics doped with MgO

Obradović

Stevanović

Ristić

2008

Powder Metall Met Ceram

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621.762.5.666 The aim of this work is to analyze nonisothermal sintering of zinc titanate ceramics doped with MgO obtained by mechanical activation. Mixtures of ZnO, TiO 2 , and MgO (0, 1.25,and 2.5%) are mechanically activated for 15 min in a planetary ball mill. Nonisothermal sintering is performed in air for 120 min at 800, 900, 1000, and 1100°C. Microstructure parameters are revealed from an approximation method. Structural characterization of ZnO-TiO 2 -MgO system after milling is performed at room temperature using XRPD measurements. The main conclusions are that mechanical activation leads to the particle size reduction, the increase of dislocation density, and lattice strain. Doped zinc titanate samples achieve higher densities after sintering and the diffusion mechanism is dominant during the sintering process.

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“…Although the Claus process removes a significant portion of H 2 S, a fraction significant that is enough to poison fuel cell reformers and membranes remain. Not only is there a technological need for eliminating H 2 S from these gas streams but also there are operational issues related to corrosion of process equipment, instruments, turbines and environmental issues due to conversion to sulfuric acid in the atmosphere [1][2][3]. For these reasons, catalytic desulfurization is essential for advanced industrial processes to fully take advantage of all outputs from processing fuel feedstocks as well as to prevent deleterious environmental consequences of non-action.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting activated carbon-based catalysts for selective hydrogen sulfide oxidation

Monnell

Maryanne

et al. 2008

Main Group Chemistry

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The primary product of coal gasification processes is synthesis gas (syngas), a mixture of CO, H 2 , CO 2 , H 2 O and a number of minor components. Among the most significant minor components in syngas is hydrogen sulfide (H 2 S). In addition to its adverse environmental impact, H 2 S poisons the catalysts and hydrogen purification membranes, and causes severe corrosion in gas turbines. Technologies that can remove H 2 S from syngas and related process streams are, therefore, of considerable practical interest. To meet this need, we work towards understanding the mechanism by which prospective H 2 S catalysts perform in simulated fuel gas conditions. Specifically, we show that for low-temperature gas clean-up (*1408C) using activated carbon fibers and water plays a significant role in H 2 S binding and helps to prolong the lifetime of the material. Basic surface functional groups were found to be imperative for significant conversion of H 2 S to daughter compounds, whereas metal oxides (La and Ce) did little to enhance this catalysis. We show that although thermal regeneration of the material is possible, the regenerated material has a substantially lower catalytic and sorption capacity.

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Attrition-resistant zinc titanate sorbent for sulfur

Cited by 12 publications

References 0 publications

Formation and Morphology of Zn2Ti3O8 Powders Using Hydrothermal Process without Dispersant Agent or Mineralizer

Formation and Morphology of Zn2Ti3O8 Powders Using Hydrothermal Process without Dispersant Agent or Mineralizer

Analysis of nonisothermal sintering of zinc-titanate ceramics doped with MgO

Factors affecting activated carbon-based catalysts for selective hydrogen sulfide oxidation

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