Mn/Mg/Al-spinels as catalysts for SO  abatement

Pereira, Hugo Borges; Polato, Carla Maria Salerno; Monteiro, J.L.F.; Henriques, Cristiane A.

doi:10.1016/j.cattod.2009.06.006

Cited by 27 publications

(10 citation statements)

References 26 publications

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“…In addition, the sulfur transfer agent can be reduced after inactivation, and the reduction temperature can be lowered to 500 °C, which is 30 °C lower than the reduction temperature of 530 °C mentioned in the previous reports. According to Kim and Juskelis 22 and Pereira et al 12, the reduction of sulfates (S 6+ →S 2− ) after inactivation of the sulfur transfer agent is a continuous reaction, i.e., S 4+ is an intermediate product. This result is consistent with that obtained through this experiment.…”

Section: Resultsmentioning

confidence: 99%

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De‐SO_X Performance of Spinels Containing Manganese

Jiang

Zhang²,

Tang

et al. 2014

Chem Eng & Technol

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The development of sulfur transfer agents plays a significant role in the environmental pollution control. However, at present, there are only few researches on the addition of active components to the sulfur transfer agent. Using manganese as an active component, the structure of a sulfur transfer agent is regulated through microwave reaction. The influence of the sulfur transfer agent with manganese on oxidative desulfurization performance is analyzed. The results demonstrate the key role of manganese as an active component in the reduction reaction process by pulse reduction reaction.

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Section: Resultsmentioning

confidence: 99%

“…Polato et al 4, 12 evaluated magnesium, aluminum, and manganese spinels in hydrotalcite‐like compounds as the sulfur transfer agent for simulated FCC. The increase of manganese improves the removal performance of sulfur oxides, indicated by the observation that the reduction peak does not appear at 530 °C.…”

Section: Introductionmentioning

confidence: 99%

De‐SO_X Performance of Spinels Containing Manganese

Jiang

Zhang²,

Tang

et al. 2014

Chem Eng & Technol

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“…Some authors have reported the formation of this phase at temperatures lower than those found in the present study. [28][29][30] We believe that the formation of spinel-like phase both limits and decreases the reducibility of the catalyst which is directly related to the amount of active sites available for catalytic reaction.…”

Section: Resultsmentioning

confidence: 99%

Ce - promoted catalyst from hydrotalcites for CO2 reforming of methane: calcination temperature effect

Daza¹,

Moreno²,

Molina³

2012

Quím. Nova

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Recebido em 25/7/11; aceito em 11/2/12; publicado na web em 15/6/12Ce-promoted Ni-catalysts from hydrotalcites were obtained. The effect of calcination temperature on the chemical and physical properties of the catalysts was studied. Several techniques were used to determine the chemical and physical characteristics of oxides. The apparent activation energies of reduction were determined. Catalytic experiments at 48 L g -1 h -1 without pre-reduction in CO 2 reforming of methane were performed. The spinel-like phase in these oxides was only formed at 1000 °C. The reduction of Ni 2+ in the oxides was clearly affected by the calcination temperature which was correlated with catalytic performance. The catalyst calcined at 700 °C showed the greatest activity.

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“…[10][11][12][13][14][15] Usually some rare earth metal oxides and/or transition metal ions are introduced into the structures of MgAl2O4 to improve the desulfurization (De-SOx) activity and the reducibility of the sulfate formed by the adsorbed SO2. 5,7,8,11,[13][14][15][16] However, few previous papers have addressed on the performance of magnesium-aluminate spinel in catalytic cracking of hydrocarbons. Similar to other metal oxides, both Lewis acidic sites (unsaturated coordinated metal cations) and Lewis basic sites (oxygen anions) exist on the surface of magnesium-aluminate spinel.…”

Section: Introductionmentioning

confidence: 99%

Novel Modified Magnesium-Aluminate Spinels as Potential FCC Matrix Components

Xiaoling¹,

Li²,

Honghong³

2011

Acta Physico-Chimica Sinica

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Modified magnesium-aluminate spinels (MgAl2O4) were prepared by recrystallizing a mixture of MgAl2O4 and zeolite Y nanoclusters in acidic medium to improve the acidity of MgAl2O4, which was commonly used as a sulfur transfer agent in fluid catalytic cracking (FCC) units. The acidity and basicity of these samples can be tuned by varying the pH value of the synthesis system. From the characterization and catalytic cracking tests the introduction of zeolitic building units into the spinels contributed to the increased microporosity, acidity, and hydrothermal stability. The catalytic results indicate that the activities and the product selectivities of the modified spinels for vacuum gas oil (VGO) cracking improved remarkably compared to the parent spinel. These samples exhibited even better performance than Kaolin clay for VGO cracking while retaining a part of the basic sites for oxidative SO2 uptake. Moreover, the FCC catalyst prepared using the modified spinel as a partial matrix, after equilibration, also gave superior catalytic behavior compared to a reference FCC catalyst with Kaolin clay as the main matrix.

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Mn/Mg/Al-spinels as catalysts for SO abatement

Cited by 27 publications

References 26 publications

De‐SO_X Performance of Spinels Containing Manganese

De‐SO_X Performance of Spinels Containing Manganese

Ce - promoted catalyst from hydrotalcites for CO2 reforming of methane: calcination temperature effect

Novel Modified Magnesium-Aluminate Spinels as Potential FCC Matrix Components

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Mn/Mg/Al-spinels as catalysts for SO abatement

Cited by 27 publications

References 26 publications

De‐SOX Performance of Spinels Containing Manganese

De‐SOX Performance of Spinels Containing Manganese

Ce - promoted catalyst from hydrotalcites for CO2 reforming of methane: calcination temperature effect

Novel Modified Magnesium-Aluminate Spinels as Potential FCC Matrix Components

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Product

Resources

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De‐SO_X Performance of Spinels Containing Manganese

De‐SO_X Performance of Spinels Containing Manganese