Ni based mixed oxide materials for CH4 oxidation under redox cycle conditions

Villa, Renzo

doi:10.1016/s1381-1169(03)00346-7

Cited by 134 publications

(89 citation statements)

References 7 publications

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“…This difference was related to the reaction of active and carrier material during heat treatment with formation of compounds such as MgO, MgNiO 2 and NiAl 2 O 4 [15,17,18]. Ni60 turned out to be better than Ni40 at converting methane, as it had been previously reported [14,15,19]. The reactivity of Ni60 to methane was highly dependent on temperature and displayed a large increase between 800 and 1000…”

mentioning

confidence: 67%

Evaluation of different oxygen carriers for biomass tar reforming (II): Carbon deposition in experiments with methane and other gases

Mendiara

Johansen

Utrilla

et al. 2011

Fuel

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mentioning

confidence: 67%

Evaluation of different oxygen carriers for biomass tar reforming (II): Carbon deposition in experiments with methane and other gases

Mendiara

Johansen

Utrilla

et al. 2011

Fuel

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“…Spray drying [181], incipient impregnation [151], and mechanical mixing [37] has been used considering the capability of scaling-up for industrial application and the potential to reduce particle production costs. [165,211], which has poor reactivity for CLC [212]. spinel.…”

Section: Ni-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

1,999

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 this purpose, a NiO/MgAl 2 O 4 oxygen carrier has been chosen. MgAl 2 O 4 has been studied by several authors as an alternative support to alumina [26,28,57], because the addition of Mg to the support limits the sintering of NiO and stabilizes the Ni 2+ in the solid phase. As a result, the Ni-based carrier shows a high stability after multiple reduction and oxidation cycles even at temperatures above 1300°C [58].…”

Section: Case Studymentioning

confidence: 99%

“…In addition, considerable concern has recently been expressed concerning the potential risks for human health and the environment posed by the emissions of trace compounds of some oxygen carriers, such as Ni or Co [9]. This is particularly unfortunate in the case of Ni-based materials, because they have been extensively studied and have shown some of the best performances as oxygen carriers for chemical looping combustion from lab scale test to pilot plants up to 120 kW th [10,[26][27][28] and chemical looping reforming [29,30]. They exhibit a very high reactivity and reversibility at temperatures up to 1200-1300°C, a very high oxygen carrying capacity and few thermodynamic restrictions for the complete methane conversion to CO 2 and H 2 O. Ni based materials require an inert support because unsupported NiO particles have shown low reaction rates and a strong tendency to agglomeration [31].…”

Section: Introductionmentioning

confidence: 99%