Catalytic activity and activation mechanism of potassium carbonate supported on perovskite oxide for coal char combustion

Kim, Young Kwang; Hao, Li Fang; Park, Joo Il; Miyawaki, Jin; Mochida, Isao; Yoon, Seong Ho

doi:10.1016/j.fuel.2011.10.017

Cited by 46 publications

(23 citation statements)

References 39 publications

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“…In addition, literature reports have reached consensus that a key factor of catalytic gasification is to ensure the activity of catalyst, which majorly determines the carbon conversion and gasification rate 27. In this work, the potassium compounds that are majorly responsible for the catalytic gasification are water‐soluble K 2 CO 3 and arcanite 28. However, due to the existence of kaolin, it can react with the active K 2 CO 3 to form water‐insoluble kaliophilite instead of arcanite, leading to deactivation of the potassium catalyst 29.…”

Section: Resultsmentioning

confidence: 89%

Ash Sintering Behavior of Lignite in Catalyzed Steam Gasification with Kaolin as Additive

Zhang

Yang

et al. 2015

Energy Tech

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An investigation of the ash sintering characteristics of LLI lignite with kaolin additive during K2CO3‐catalyzed steam gasification was conducted in this study. The ash samples were prepared using a catalytic gasification system at 1073 K under steam atmosphere. Experiments on the sintering behavior were performed using a pressure‐drop sintering device under inert N2. Results showed that when increasing the concentration of K2CO3 from 0 to 10 wt %, the ash sintering temperature decreased and the ash molten degree become more serious. The potassium‐containing compounds arcanite and kaliophilite can trigger the occurrence of sintering on reactions with other minerals to facilitate the formation of liquid phases and then result in a lower ash sintering temperature. Besides, kaolin can increase ash sintering temperature and ease the melt degree of ashes. Kaolin can react with other minerals to generate more refractory silicon oxide and decrease the fluxing arcanite and amorphous materials in ashes.

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Section: Resultsmentioning

confidence: 89%

Ash Sintering Behavior of Lignite in Catalyzed Steam Gasification with Kaolin as Additive

Zhang

Yang

et al. 2015

Energy Tech

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“…One of such approaches is focused on intensification of the coal combustion process by using of activation additives in order to improve the efficiency of coal combustion (Tikhov et al 2013). Existing experience in the activation additives for solid fuel combustion is based on using the alkalineearth oxides (MgO, CaO) and transition metals oxides (MnO 2 , CuO) (Li et al 2007;Gong et al 2009Gong et al , 2010aWei et al 2012;Huang et al 2013), different salts (MgCl 2 , Ni(NO 3 ) 2 , LiCl) and alkalis (NaOH, KOH) (Zhao et al 2011;Abbasi-Atibeh and Yozgatligil 2014;Guo et al 2014;Yin et al 2012;He et al 2013;Kim et al 2012;Fangxian et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Non-isothermal oxidation of coal with Ce(NO3)3 and Cu(NO3)2 additives

Ларионов

Gromov

2019

Int J Coal Sci Technol

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Non-isothermal oxidation of brown coal with 5 wt% of Cu(NO 3) 2 , 5 wt% of Ce(NO 3) 3 and {2.5 wt% Cu(NO 3) 2 ? 2.5 wt% Ce(NO 3) 3 } additives was studied. The introduction of additives was carried out by an incipient wet impregnation method to ensure uniform distribution of cerium and copper nitrates within the structure of coal powdery samples (according to SEM and EDX mapping). The samples reactivity was studied in an isothermal oxidation regime at 200°C (1 h) and by DSC/TGA at 2.5°C/min heating rate. The additives implementation was found to reduce significantly the oxidation onset temperature (DT i = 20-55°C), the samples oxidation delay time (Dt i = 2-22 min) and overall duration of the oxidation process (Dt c = 8-16 min). The additives efficiency could be graded in accordance with the activation on the coal oxidation in the following row: Cu(NO 3) 2 [ {Cu(NO 3) 2 ? Ce(NO 3) 3 } [ Ce(NO 3) 3. According to the mass spectroscopy, the obtained row of activation correlates well with the initial temperature of the studied nitrate's decomposition (from 190 to 223°C). A presence of nitrates was found to change significantly the trend of heat release taking place during the oxidation of coal samples (according to DSC/TGA data). The influence of coal morphology and volatiles content in initial sample on the parameters of the oxidation process was studied as well. Activation energy (E a) of the coal oxidation was calculated using Coats-Redfern method. Maximum decrease in E a from 69 to 58 kJ/mol was observed for the samples with Cu(NO 3) 2 .

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“…Kim et al [17] have found that K 2 CO 3 supported on perovskite oxide presented a good catalytic activity for soot combustion. Peralta et al [18] have reported the influence of K precursor on soot combustion, the activity of K/La 2 O 3 for soot oxidation followed the subsequent order: K NO3 /La 2 O 3 > K OH /La 2 -O 3 > K CO3 /La 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Efficient catalytic removal of diesel soot over Mg substituted K/La0.8Ce0.2CoO3 perovskites with large surface areas

Wang

Fang

Feng

et al. 2016

Chemical Engineering Journal

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Catalytic activity and activation mechanism of potassium carbonate supported on perovskite oxide for coal char combustion

Cited by 46 publications

References 39 publications

Ash Sintering Behavior of Lignite in Catalyzed Steam Gasification with Kaolin as Additive

Ash Sintering Behavior of Lignite in Catalyzed Steam Gasification with Kaolin as Additive

Non-isothermal oxidation of coal with Ce(NO3)3 and Cu(NO3)2 additives

Efficient catalytic removal of diesel soot over Mg substituted K/La0.8Ce0.2CoO3 perovskites with large surface areas

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