Cu-Modified Manganese Ore as an Oxygen Carrier for Chemical Looping Combustion

Xu, Lei; Edland, Rikard; Li, Zhenshan; Leion, Henrik; Cai, Ningsheng

doi:10.1021/ef5017686

Cited by 42 publications

(23 citation statements)

References 26 publications

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“…The addition of Cu increased the oxygen transport capacity with high fuel conversion. The synergetic effects to improve oxygen transport capacity with high fuel conversion have been observed when copper is coated on manganese ore or Hematite [28][29]. In these studies, oxygen transport capacity with high selectivity was dramatically enhanced six times.…”

Section: Selectivity Of Ocs In Converting Syngas To Co 2 and H 2 Omentioning

confidence: 89%

Activation of ilmenite as an oxygen carrier for solid-fueled chemical looping combustion

et al. 2017

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Ilmenite ore is one of the promising oxygen carriers (OCs) used for coal-fueled Chemical-Looping Combustion (CLC) for electricity generation and CO 2 capture. However, the low reactivity and natural activation of ilmenite OC are two major constrains impeding its application. This effort is to improve ilmenite OC's performance by introducing a small amount of foreign elements, including alkali or alkaline earth metals (K and Ca) and transition metals (Cu, Mn, and Ni). Coating and re-granulation methods were used to prepare OCs where ilmenite ore was the primary constituent. The reactivity, transport capacity, and selectivity of these ilmenite-based OCs with wet syngas, as well as their performances in coal char-fueled CLC were investigated using a TGA, fixed-and fluidized-bed reactors. The addition of K-element significantly improved the OC's reactivity with wet syngas and coal char. The strong catalytic function for WGSR from K-added OCs was found to play a vital role. Cu-coating hindered effectively Fe-element segregation on the surface of ilmenite OC during cyclic reaction, and the OC structural integrity was well maintained. Ca-, Ni-and Mn-added ilmenite OCs did not show promising prospects. The gasification rate and combustion efficiency could be respectively correlated to the reactivity and selectivity of different OCs except for the K-added samples.

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Section: Selectivity Of Ocs In Converting Syngas To Co 2 and H 2 Omentioning

confidence: 89%

Activation of ilmenite as an oxygen carrier for solid-fueled chemical looping combustion

et al. 2017

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“…When Cu is added to Mn ore a possible synergistic effect was noted and potential CLOU properties were observed. While all of the samples showed complete CO conversion, the major influence this addition had was a prolonged conversion time, likely due to an increased oxygen transport capacity (Xu et al, 2014). The addition of Cu to Fe ore also showed a higher CO conversion as well as an increase in C conversion .…”

Section: Mixed Ores and Modificationsmentioning

confidence: 94%

Use of natural ores as oxygen carriers in chemical looping combustion: A review

Matzen

Pinkerton

Wang

et al. 2017

International Journal of Greenhouse Gas Control

118

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Chemical looping combustion (CLC) has gained considerable ground in energy production due to its inherent carbon capture with a minimal energy penalty. The choice of metal oxide used as an oxygen carrier (OC) in CLC has a substantial weight on the overall efficiency of energy production as well as the ultimate cost per MW. While much work has gone into manufacturing synthetic OCs with high fuel conversions, harsh operating conditions and process limitations cause some unavoidable loss of the oxygen carrier. With low production costs and minimal conditioning required, natural ores have grown in interest as cheap alternative oxygen carriers. This work provides a substantial literature review of recent works studying the use of natural ores in CLC. Iron-based, manganesebased, copper-based and calcium based ores were found to be the main ores researched, along with mixtures of these ores and natural ores with minor additional compounds. Typical parameters have been collected for each study including; fuel conversion, stability, physical characteristics, and carbon capture efficiency. Natural ores are compared with purified metal oxides to highlight strengths and weaknesses of each ore and recommendations for future studies are made.

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“…They found that the Cu-Mn mixed oxides was able to generate gaseous oxygen up to 700 ºC and have good reactivity with CH4 but CO was present in the outlet stream. Depending on the Cu-Mn mixed oxide phase formed during the oxygen carrier preparation: CuMn2O4 [7,20] or Cu1.5Mn1.5O4 [19,21], the oxygen release can occur by two different reactions: 2…”

Section: Introductionmentioning

confidence: 99%

CLOU process performance with a Cu-Mn oxygen carrier in the combustion of different types of coal with CO2 capture

Adánez-Rubio

Abad

Gayán

et al. 2018

Fuel

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The Chemical Looping with Oxygen Uncoupling (CLOU) process is a Chemical Looping Combustion (CLC) technology that allows the combustion of solid fuels with inherent CO2 separation by using oxygen carriers based on metal oxides. This technology has low energy penalty and thus low CO2 capture costs. In CLOU, the oxygen carrier must be able to release gaseous oxygen which limit the availability of metal oxides for this process. In this work, the suitability of oxygen carrier particles containing 34 wt.% CuO and 66 wt.% Mn3O4 (active phase Cu1.5Mn1.5O4) prepared by granulation was investigated in a continuous 1.5 kWth rig during CLOU combustion of different rank coals (two sub-bituminous and a lignite). The effect of the different coals in the combustion and CO2 capture efficiencies at different oxygen carrier to coal ratios was studied. It was found that full combustion can be reached independently of the coal used. However, CO2 capture efficiencies were highly determined by the coal rank. Finally it was found that work with oxygen carrier to coal ratios higher than 4 and the low oxygen carrier conversion both in the fuel and air reactors decreasing the effect of 1 the chemical stress in the attrition rate; therefore it is clearly beneficial for the lifetime of the oxygen carrier particles to operate with low ΔX between fuel and air reactors.

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Cu-Modified Manganese Ore as an Oxygen Carrier for Chemical Looping Combustion

Cited by 42 publications

References 26 publications

Activation of ilmenite as an oxygen carrier for solid-fueled chemical looping combustion

Activation of ilmenite as an oxygen carrier for solid-fueled chemical looping combustion

Use of natural ores as oxygen carriers in chemical looping combustion: A review

CLOU process performance with a Cu-Mn oxygen carrier in the combustion of different types of coal with CO2 capture

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