Promoted catalysis of calcium on the hydrogasification reactivity of iron-loaded subbituminous coal

Yuan, Shenfu; Zhang, Na; Qu, Xuanhui; Bi, Jing; Cao, Qiue; Wang, Jiliang

doi:10.1016/j.fuel.2017.03.066

Cited by 35 publications

(16 citation statements)

References 39 publications

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“…In order to pursue relatively mild operating conditions as well as higher energy conversion efficiency, researchers proposed a coal/char catalytic hydrogasification (CCHG) technology, which is appealing for the addition of desirable catalysts. 7,8 Although various metals, 9,10 especially Rh, Ru, and Pt, could markedly increase the hydrogasification rate of coal, their high price limited their utilization in industry. Many researchers are therefore paying more attention to iron group metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

Study of Cu–Ni–Ca Composite Catalysts in Catalytic Hydrogasification of Char

Sun

Zhang

et al. 2019

Energy Fuels

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The catalytic hydrogasification of char to synthetic natural gas was carried out in a pressurized fixed-bed reactor over Cu−Ni−Ca composite catalysts. The effect of the Cu−Ni ratio, Cu−Ni loading, reaction temperature on methane yield, and the methane formation rate was investigated. The characterization of these catalysts by X-ray diffraction showed that the Cu−Ni alloy was formed with a suitable Cu−Ni ratio during hydrogasification. Experiment results indicated that a suitable Cu− Ni ratio of 1:1 was favored for the formation of Cu−Ni alloy, which presented the highest catalytic activity. Methane yield and methane formation rate for 2.5%Cu−2.5%Ni−1.0%Ca reached 88.3% and 11.56 mL/(min•g char) at 800 °C and 2 MPa H 2 pressure in 450 min, respectively. The high catalytic performance of the Cu−Ni alloy was due to the isolation of Cu and Ni atoms from their adjacent atoms, resulting in more adsorption and dissociation of hydrogen molecules as well as the interaction between metal atoms and carbon. Moreover, a possible reaction mechanism for coal/char catalytic hydrogasification over Cu− Ni−Ca composite catalysts was proposed.

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Section: Introductionmentioning

confidence: 99%

Study of Cu–Ni–Ca Composite Catalysts in Catalytic Hydrogasification of Char

Sun

Zhang

et al. 2019

Energy Fuels

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“…In RW, calcium-based compounds make up more than 60 wt% of the inorganics. The influence of Ca during co-firing has been previously studied by other researchers [50], which suggest that catalytic activity of Ca is restricted to its ability to migrate and react with the organic species in the carbon matrix of coal. Consequently, the transformation of calcium increases its catalytic effect on the coal char's matrix during combustion [18,51].…”

Section: Impacts Of Minerals On Co-combustionmentioning

confidence: 96%

Investigation on the interactions among lignocellulosic constituents and minerals of biomass and their influences on co-firing

Shi

Oladejo

Jin

et al. 2019

Energy

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The influences of biomass constituents, such as lignocellulosic components and minerals, on the combustion of coal/biomass blends are of significant importance in co-firing due to its potential impacts on ignition, flame stability and burnout. In this research, combustion characteristics of pure lignocellulosic elements, Rosewood, Mengxi coal and their blends were studied in detail. The effect of minerals in Rosewood on combustion of biomass/Mengxi coal blends was investigated which revealed reductions in the ignition (≤ 20 °C), peak (≤ 12 °C) and burnout temperatures ( ≤ 6 °C). The results also demonstrate the existence of interactions between lignocellulosic constituents in the model biomass, which is dominated by the interactions of cellulose-derived products with xylan and lignin respectively which led to ~8% reduction in char oxidation temperature. The minerals in biomass showed different impacts at different stages of the combustion process, such as inhibition effect during the devolatilization stage, and promotive synergy (mainly due to calcium) on ignition and char oxidation.

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“…When the concentration of KOH was increased, potassium, iron, and calcium cations (Fig. 6) were octahedrally coordinated to a range of oxygen functional groups such as -OH − and -COO − present in HAs [15].…”

Section: Yields Of Humic Acidsmentioning

confidence: 99%

Influence of addition of KOH on the yield and characteristics of humic acids extracted from lignite using NaOH

Yuan

2021

SN Appl. Sci.

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In this study, humic acids (HAs) were extracted from Chinese lignite by adding KOH to a NaOH solution. The extraction yield of HAs was found to improve because of the synergistic effect imparted by the alkali mixture of sodium hydroxide (NaOH) and potassium hydroxide (KOH). The maximum yield was obtained at 150 min by adding the mixture of 0.750 M NaOH + 0.710 M KOH to Xianfeng lignite at 80 °C. The potassium (K), sodium (Na), nitrogen (N), oxygen (O), and iron (Fe) contents were determined by X-ray diffraction, scanning electron microscopy, and proximate and ultimate analysis. The oxygen-containing functional groups in HAs were identified by Fourier transform infrared spectroscopy. The addition of KOH resulted in higher oxygen/carbon and nitrogen/carbon ratios and oxygen-containing functional groups, as compared with that in NaOH alone. The extractants containing KOH could release HAs with a higher proportion of K, Fe, N contents, which is beneficial for HAs fertilizers prepared from the lignite. The release of the nutrients (K, Fe, N) which are essential for the crops is determined by the KOH dosages.

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Promoted catalysis of calcium on the hydrogasification reactivity of iron-loaded subbituminous coal

Cited by 35 publications

References 39 publications

Study of Cu–Ni–Ca Composite Catalysts in Catalytic Hydrogasification of Char

Study of Cu–Ni–Ca Composite Catalysts in Catalytic Hydrogasification of Char

Investigation on the interactions among lignocellulosic constituents and minerals of biomass and their influences on co-firing

Influence of addition of KOH on the yield and characteristics of humic acids extracted from lignite using NaOH

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