High temperature behaviour of a CuO/γAl2O3 oxygen carrier for chemical-looping combustion

Forero, Carmen R.; Gayán, Pilar; Garcı́a-Labiano, F.; Diego, Luis F. de; Adánez, Juan

doi:10.1016/j.ijggc.2011.03.005

Cited by 110 publications

(76 citation statements)

References 24 publications

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“…Furthermore, this oxygen carrier-to-fuel ratio value is similar to those found for other Cu-and Ni-based oxygen carriers for CH 4 combustion [24,25].…”

Section: Effect Of H 2 S On the Combustion Efficiencysupporting

confidence: 85%

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

Cabello

Dueso

Garcı́a-Labiano

et al. 2014

Fuel

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103

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A synthetic Fe-based oxygen carrier prepared by impregnation using -Al 2 O 3 as support, successfully tested for gas CLC combustion, has been now evaluated with respect to gas combustion in a 500 W th CLC continuous unit when the fuel, CH 4 , contained variable amounts of H 2 S.Full gas combustion was reached at oxygen carrier-to-fuel ratio values higher than 1.5. The presence of sulfur in the fuel gas hardly affected the reactivity and combustion efficiency of the oxygen carrier, independently of the amount of sulfur in the gas stream. All the sulfur introduced as H 2 S in the fuel reactor (FR) was released in the same reactor as SO 2 . Furthermore, oxygen carrier particles extracted from the CLC unit after the experimental tests with H 2 S addition were 3 characterized by means of different techniques and no sulfur was detected in any case. The impregnated Fe-based oxygen carrier was highly reactive and sulfur resistant, and can be considered as a suitable material for CLC with gaseous fuels that contain sulfur.

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“…Furthermore, this oxygen carrier-to-fuel ratio value is similar to those found for other Cu-and Ni-based oxygen carriers for CH 4 combustion [24,25].…”

Section: Effect Of H 2 S On the Combustion Efficiencysupporting

confidence: 85%

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

Cabello

Dueso

Garcı́a-Labiano

et al. 2014

Fuel

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103

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“…Forero et al [142] analysed the behaviour of a Cu-based full combustion if special configurations of the fuel reactor was used, e.g. with counterflow of gas and solids in moving beds [20,58].…”

Section: Cu-based Oxygen-carriersmentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

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1,614

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This work is a comprehensive review of the Chemical-Looping Combustion (CLC) and Chemical-Looping Reforming (CLR) processes reporting the main advances in these technologies up to 2010. These processes are based on the transfer of the oxygen from air to the fuel by means of a solid oxygen-carrier avoiding direct contact between fuel and air for different final purposes. CLC has arisen during last years as a very promising combustion technology for power plants and industrial applications with inherent CO 2 capture which avoids the energetic penalty present in other competing technologies.CLR uses the chemical looping cycles for H 2 production with additional advantages if CO 2 capture is also considered.The review compiles the main milestones reached during last years in the development of these technologies regarding the use of gaseous or solid fuels, the oxygen-carrier development, the continuous operation experience, and modelling at several scales. Up to 2010, more than 700 different materials based on Ni, Cu, Fe, Mn, Co, as well as other mixed oxides and low cost materials, have been compiled. Especial emphasis has been done in those oxygen-carriers tested under continuous operation in Chemical-Looping 2 prototypes. The total time of operational experience (≈ 3500 h) in different CLC units in the size range 0.3-120 kW th , has allowed to demonstrate the technology and to gain in maturity. To help in the design, optimization, and scale-up of the CLC process, modelling work is also reviewed. Different levels of modelling have been accomplished, including fundamentals of the gas-solid reactions in the oxygen-carriers, modelling of the air-and fuel-reactors, and integration of the CLC systems in the power plant. Considering the great advances reached up to date in a very short period of time, it can be said that CLC and CLR are very promising technologies within the framework of the CO 2 capture options.

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“…For CLC, impregnated CuO/Al 2 O 3 materials were extensively investigated in units ranging from 0.5 to 10 kW th , even with sulphur containing gases [18][19][20][21][22][23]. These materials showed complete combustion of fuel gases due to the high reactivity with CH 4 , H 2 and CO.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a sol–gel derived CuO/CuAl2O4 oxygen carrier for chemical looping combustion (CLC) of gaseous fuels: Relevance of gas–solid and oxygen uncoupling reactions

Mei

Abad

Zhao

et al. 2015

Fuel Processing Technology

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A new sol-gel CuO/CuAl 2 O 4 material was characterized for chemical looping combustion (CLC) with gaseous fuels, including the analysis of the relevance of the oxygen uncoupling mechanism in oxygen transference was considered. This material possesses high reactivity and oxygen transport capacity, which combines the best features of the previously reported impregnated and spray-dried materials. A new test based on thermogravimetric analyzer (TGA) was designed and performed, from which the composition of this new material was determined. During the cycle tests in alternating N 2 and air, it was found that CuO decomposed fully into Cu 2 O in N 2 and later completely regenerated to CuO in air, similarly to chemical looping with oxygen uncoupling (CLOU) for solid fuels. However, the decomposition of CuAl 2 O 4 to CuAlO 2 was quite slow, and the followed regeneration of this compound cannot be accomplished. Subsequently, high numbers of cycles (>50 cycles) with gaseous fuels were conducted, which suggested adequate and stable rate for the combustion of the gaseous fuels with this oxygen carrier. The material undergone such cycles with gaseous fuels was then subjected to oxygen release and uptake cycles. It was observed that the CuO/CuAl 2 O 4 was reconstructed after using in gaseous fuels combustion. This behavior resulted in the segregation of CuO from Al 2 O 3 in the CuAl 2 O 4 , producing higher amount of free CuO and thus more available oxygen for CLOU with respect to the initial material. This is a new observation for this kind of material. Finally, the relative importance of gas-solid reactions in CLC against oxygen uncoupling in CLOU was examined when a fuel gas was presented in the reacting atmosphere, which, as one of the novelties of this paper, was never reported before.

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High temperature behaviour of a CuO/γAl2O3 oxygen carrier for chemical-looping combustion

Cited by 110 publications

References 24 publications

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

Progress in Chemical-Looping Combustion and Reforming technologies

Characterization of a sol–gel derived CuO/CuAl2O4 oxygen carrier for chemical looping combustion (CLC) of gaseous fuels: Relevance of gas–solid and oxygen uncoupling reactions

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