Water-insoluble compounds formed by reaction between potassium and mineral matter in catalytic coal gasification

Bruno, Giacomo; Buroni, M.; Carvani, Luigi; Piero, G. Del; Passoni, G.

doi:10.1016/0016-2361(88)90014-2

Cited by 43 publications

(31 citation statements)

References 4 publications

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“…This suggested that upon the heat-up to 500°C, as Ca(OH) 2 and Ca(Ac) 2 were decomposed to some poorly-crystalline calcium oxide, part of Ca(OH) 2 was transformed to calcite, and part of Ca(Ac) 2 to calcite and aragonite. Meanwhile, kaolinite persisted in all four chars; however, supposing that the peak intensities of quartz remained unchanged for four chars to remove the dilution effect of additive in the light of a much lower alkalization reactivity of quartz than kaolinite [12], calculation showed that the peak intensities of kaolinite at the 2h angle of 12.3°were reduced by 48%, 63% and 84%, respectively, for the CC char, the CH char and the CA char, relative to the same peak intensity for the RC char. Therefore, it was inferred that some kaolinite was attacked by calcium species upon the heat-up to 500°C and distorted in the crystallinity, although the bulk of kaolinite remained unreacted.…”

Section: Xrd Analysis and Raman Spectroscopymentioning

confidence: 93%

“…Potassium carbonate is a superior catalyst and has a potential for practical application to gasification of coal and other carbonaceous resources, and it has thereby received a good deal of attention [1][2][3][4][5][6][7][8][9][10]. With respect to coal gasification, however, there is a serious issue arising from the interaction between potassium and mineral matter in coal, which depletes the catalytic activity and also makes it difficult to recover catalyst from the ash due to the formation of water-insoluble potassium [11][12][13].…”

Section: Introductionmentioning

confidence: 98%

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Calcium-promoted catalytic activity of potassium carbonate for steam gasification of coal char: Influences of calcium species

Jiang¹,

Zhou²,

Hu³

et al. 2012

Fuel

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Section: Xrd Analysis and Raman Spectroscopymentioning

confidence: 93%

Section: Introductionmentioning

confidence: 98%

Calcium-promoted catalytic activity of potassium carbonate for steam gasification of coal char: Influences of calcium species

Jiang¹,

Zhou²,

Hu³

et al. 2012

Fuel

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“…The contents of the metallic species in the chars were determined according to procedures reported previously. 24,25 The alkali and alkaline earth metallic species (i.e., Na, K, Mg, and Ca) were quantified by a sequence of dissolution of ash with an aqueous solution of HNO 3 /HF, evaporation to dryness, re-dissolution into an aqueous solution of CH 3 SO 3 H, and its analysis by ion chromatography, while X-ray fluorescence spectroscopy was employed to quantify Fe, Si, Al, and other minor species in the ash. Table 1 shows the ash contents and elemental compositions of the SCBs, AW-SCBs, and WW-SCBs.…”

Section: Methodsmentioning

confidence: 99%

CO₂ Gasification of Sugar Cane Bagasse: Quantitative Understanding of Kinetics and Catalytic Roles of Inherent Metallic Species

et al. 2017

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A total of 18 chars from the pyrolysis of six trios of sugar cane bagasses (SCBs; original, water-washed, and acid-washed) were gasified with CO2 at 900 °C, aiming at a quantitative description of the rate of gasification catalyzed by inherent metallic species and a correlation of the catalytic activity and its change during the gasification with the metallic species composition. The measured kinetics was described quantitatively over a range of char conversion, 0–0.999, by a model that assumed progress in parallel of the catalytic gasification and non-catalytic gasification, together with the presence of a catalytic precursor and three to four types of catalysts having different activities and deactivation characteristics. A series of regression analyses was scrutinized and reached expression of initial catalytic activity as a linear function of Na, K, Ca, Fe, and Si concentrations in the char with a correlation factor (r 2) of >0.98. The catalyst precursor contributed fully by water-soluble Na, K, and Ca. Si was responsible for the catalyst deactivation during the pyrolysis but not during the gasification. The chars produced from original SCBs followed a linear relationship between the initial catalytic deactivation rate and initial activity (r 2 > 0.99), while such a linear relationship was not valid for those formed from the water-washed SCBs. This was explained mainly by more rapid deactivation of the Fe catalyst in the chars from water-washed SCBs than that in the chars formed from the original SCBs. Na and K in char from the original SCBs, originating from the water-soluble SCBs, chemically interacted with the Fe catalyst, slowing its deactivation.

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“…[3][4][5] But the potassium catalyst could react with minerals to form inactive, water-insoluble compounds. [6][7][8] The incomplete recovery of the potassium catalyst from residue would significantly affect the cost of the final product. Therefore it is necessary to understand the formation process of water-insoluble potassium.…”

Section: Introductionmentioning

confidence: 99%

Transformation and Reactivity of a Potassium Catalyst during Coal–Steam Catalytic Pyrolysis and Gasification

et al. 2014

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The transformation of potassium catalyst during coal pyrolysis and steam gasification has been studied in a fixed‐bed reactor. The gasification residues were obtained by leaching in the water and drying in an oven. The crystallite constituents and ash constituent of the gasification residue were identified by X‐ray diffraction (XRD) and X‐ray fluorescence (XRF). The results showed that potassium aluminum silicate crystallites were derived from the interaction of potassium with mineral matter. The amount of reduced potassium in the gasification residue was measured by adding steam at low‐temperature conditions. The transformation of potassium catalyst and amount of metallic potassium intermediate were determined during pyrolysis and gasification. The amount of K2CO3 pyrolysis residue decreased as the pyrolysis temperature increased, and the reaction activity increased as the amount of reduced‐state potassium increased.

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Water-insoluble compounds formed by reaction between potassium and mineral matter in catalytic coal gasification

Cited by 43 publications

References 4 publications

Calcium-promoted catalytic activity of potassium carbonate for steam gasification of coal char: Influences of calcium species

Calcium-promoted catalytic activity of potassium carbonate for steam gasification of coal char: Influences of calcium species

CO₂ Gasification of Sugar Cane Bagasse: Quantitative Understanding of Kinetics and Catalytic Roles of Inherent Metallic Species

Transformation and Reactivity of a Potassium Catalyst during Coal–Steam Catalytic Pyrolysis and Gasification

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Water-insoluble compounds formed by reaction between potassium and mineral matter in catalytic coal gasification

Cited by 43 publications

References 4 publications

Calcium-promoted catalytic activity of potassium carbonate for steam gasification of coal char: Influences of calcium species

Calcium-promoted catalytic activity of potassium carbonate for steam gasification of coal char: Influences of calcium species

CO2 Gasification of Sugar Cane Bagasse: Quantitative Understanding of Kinetics and Catalytic Roles of Inherent Metallic Species

Transformation and Reactivity of a Potassium Catalyst during Coal–Steam Catalytic Pyrolysis and Gasification

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CO₂ Gasification of Sugar Cane Bagasse: Quantitative Understanding of Kinetics and Catalytic Roles of Inherent Metallic Species