Dependence of chemical composition of calcined hydrotalcite-like compounds for SOx reduction

Sánchez‐Cantú, Manuel; Pérez-Díaz, Lydia M.; Maubert, A.; Valente, Jaime S.

doi:10.1016/j.cattod.2009.09.010

Cited by 41 publications

(16 citation statements)

References 20 publications

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“…It was reported before that the interlayer distance is also affected by the introduction of copper [18,19]. Basal spacing depends on the interlayer water content, the amount, size, orientation, and charge of the anion located between the brucite-like layers [17]. The values obtained in the study of about 2.3 nm are typical for hydrotalcites containing carbonate as the interlayer anion; however, parameter c increases for small Cu-concentrations (Mg 2 Cu 0.5 Fe 1 ).…”

Section: Resultsmentioning

confidence: 99%

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

et al. 2011

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Mg-Cu-Fe oxide systems, obtained from hydrotalcite-like precursors, were tested as catalysts for the selective catalytic oxidation (SCO) of ammonia. Copper containing catalysts were active in low-temperature SCO processes; however, their selectivity to nitrogen significantly decreased at higher temperatures. The optimum composition of the catalyst to guarantee high activity and selectivity to N 2 was proposed. Temperature-programmed experiments, SCO catalytic tests performed with various contact times and additional tests on the samples in the selective catalytic reduction of NO with ammonia showed that the SCO process over the studied calcined hydrotalcites proceeds according to the internal SCR mechanism and oxidation of ammonia to NO is a rate-determining step in the low-temperature range.

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Section: Resultsmentioning

confidence: 99%

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

et al. 2011

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“…Pasado el tiempo de exposición a la radiación microonda, el gel resultante se dejó enfriar para filtrar, lavar y secar el sólido obtenido. El horno microondas utilizado fue de tipo doméstico modelo The Genius Sensor 1250 W marca Panasonic; el equipo no permite tener un registro y control de la temperatura durante la digestión; sin embargo, se fijó la potencia de funcionamiento del horno en el primer nivel que equivale a 125 W. La síntesis de las hidrotalcitas Ni-Fe se desarrolla según lo establecido para el método por coprecipitación [11][12][13]. En el método por radiación de microondas se revisaron algunas investigaciones [2,[13][14][15][16]] para establecer las condiciones de síntesis.…”

Section: Parte Experimentalunclassified

Estudio estadístico de la incidencia de ciertas variables de síntesis sobre la cristalinidad y otras propiedades de hidrotalcitas Ni, Fe

Mujica-F.

Linares

Velásquez

2017

Ingeniare. Rev. chil. ing.

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“…Meanwhile, the scientific community is actively exploring different approaches to minimise SO x emission. [2][3][4] The strategies are varied, depending on the emission source. SO x are mostly produced by combustion of sulphur-containing fossil fuels.…”

Section: Introductionmentioning

confidence: 99%

“…Given the complexity of the FCC process, SO x removal catalysts must possess an extensive set of characteristics. The main catalytic requirements are: 3,4,18,19 i) promote the oxidation of SO 2 to SO 3 in the regenerator; ii) chemisorb SO 3 to produce a metallic sulphate that remains stable at the conditions prevailing in the regenerator, iii) the metallic sulphate must be readily transformed to the corresponding metallic sulphide at the reductive conditions (H 2 /hydrocarbons atmosphere) of the riser, and iv) the metallic sulphide should then be hydrolyzed, by steam injected to the stripper, to restore the original metal oxide catalyst and produce H 2 S (Scheme 1). 20 Additionally, the catalyst must not modify significantly the feed conversion nor the products distribution.…”

Section: Introductionmentioning

confidence: 99%

Novel SOx removal catalysts for the FCC process: Manufacture method, characterization, and pilot-scale testing

Valente

Quintana‐Solórzano

2011

Energy Environ. Sci.

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A novel method for preparing SO x removing (ReSO x ) catalysts for the fluid catalytic cracking (FCC) process, based on multimetallic layered double hydroxides (LDHs), is presented. The synthesis procedure is industrially feasible and environmentally friendly. Ceria is incorporated in varying amounts as oxidation promoter, to obtain catalysts that are able to work efficiently in either partial or full combustion regenerator modes. The manufacturing process presented herein enables obtaining, by spray drying, microsphere particles with mechanical properties that are adequate for fluidization, without requiring addition of binding agents. The physicochemical properties of the catalysts are examined by several characterization techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). A uniform dispersion of the metal components is observed throughout the particles. Furthermore, the microspheroidal catalysts are tested for the reduction of SO x emissions in a pilot-scale FCC plant, circulating together with a conventional cracking catalyst, during the conversion of a sulphur-containing industrial gas oil obtained from a Mexican refinery. ReSO x catalyst addition to the pilot FCC unit, in only 0.2 wt% of the total catalyst inventory, results in a maximum %SO 2 reduction of 74-80%. Additionally, the effect of the ReSO x catalyst on the main cracking reactions is studied; it is shown that the disruption of the cracking catalyst's activity and selectivity is minimal, at a concentration of 1.5 wt% of the total catalyst inventory. Thus, the use of these SO x removal catalysts appears as a viable, low investment, flexible and effective option for in situ reduction of SO x flue gas emissions.

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Dependence of chemical composition of calcined hydrotalcite-like compounds for SOx reduction

Cited by 41 publications

References 20 publications

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

Estudio estadístico de la incidencia de ciertas variables de síntesis sobre la cristalinidad y otras propiedades de hidrotalcitas Ni, Fe

Novel SOx removal catalysts for the FCC process: Manufacture method, characterization, and pilot-scale testing

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