Synthesis and catalytic application of SAPO-5 by dry-gel conversion for the epoxidation of styrene with air

Wei, Xianlong; Lu, Xinhuan; Zhang, T.-J.; Chu, Xiangcheng; Zhou, Dan; Nie, Renfeng; Xia, Qinghua

doi:10.1016/j.micromeso.2015.04.037

Cited by 21 publications

(9 citation statements)

References 55 publications

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“…SEM (Figure ) was further carried out to intuitively observe the morphology of Cu/SAPO. The grains of Cu/SAPO-34 present the characteristic cubic crystals, which match with the typical morphology of SAPO-34 reported in the literature. , By comparison, pure SAPO-5 exhibits a characteristic six-prism morphology. ,, Cu/SAPO-34/5 catalysts contain both six-prism grains and cubic grains.…”

Section: Resultssupporting

confidence: 85%

Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH₃-SCR

Lin

Liu

et al. 2019

Ind. Eng. Chem. Res.

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Cu/SAPO-34/5 catalysts were prepared by a traditional hydrothermal/impregnation method to investigate the effect of SAPO-34/5 on deNO x performance over Cu/SAPO-34/5 (the proportion of SAPO-34/SAPO-5 calculated by its main diffraction peak intensity). These characteristic results prove the fact that the superior deNO x performance of Cu/SAPO-34/5(3.16) is due to its most abundant Brønsted (B) acid sites and active isolated Cu 2+ . A higher amount of B acid sites over ) is better to disperse and stabilize the isolated Cu 2+ species. Besides, kinetic analysis on as-synthesized Cu/SAPOs catalysts confirms that the hybrid crystal structure of SAPO-34/5 does not change the reaction mechanism for selective catalytic reduction with NH 3 (NH 3 -SCR). This work provides a new route to synthesize a novel zeolite NH 3 -SCR catalyst for eliminating NO x emitted from diesel engines.

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Section: Resultssupporting

confidence: 85%

Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH₃-SCR

Lin

Liu

et al. 2019

Ind. Eng. Chem. Res.

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“…Moreover, it should be noticed that the peak at 1640 cm −1 came from the unavoidable physical adsorption of O–H [21]. For pure SAPO-5, the corresponding spectrum indicated that peaks at 475 cm −1 , 1115 cm −1 , and 3486 cm −1 were assigned to the benching vibration of primary structural units (like SiO 4 and AlO 4 ), the stretching vibration of Si–O–Si, and the presence of P–OH, respectively [22,23]. It was obvious that during the formation of the SAPO-5/g-C 3 N 4 composites, the component of g-C 3 N 4 was well maintained.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Qiu

Zhou

et al. 2019

Materials

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Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1 to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

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“…Las mallas moleculares se sintetizaron mediante adaptación de procedimientos reportados (A. Souza de Araujo, et al,1997, X.-L. Wei et al, 2015 bajo métodos hidrotermales, utilizando reactores de acero inoxidable con recubrimiento interno de teflón sin agitación. Los geles se sometieron a 180°C y 6 horas (AlPO-5) y 200°C y 24 horas (SAPO-5) para su cristalización.…”

Section: Síntesisunclassified

“…Al analizar el caso de impregnación con Cr 3% en SAPO-5, Fig. 4d, es notoria la formación de hexágonos de 4 micras que se superponen en ciertas capas formando policristales de 15 micras, en concordancia con los reportes de otros trabajos (Wei et al, 2015). La composición porcentual encontrada aquí (Al: 17.13; P: 18.56; Si: 11.38 y Cr: 3.76) y la encontrada por AA (Al: 15.28; P: 20.03; Si: 5.41 y Cr: 1.9) muestran similitud en cuanto a Al y P.…”

Section: Caracterización De Los Sólidosunclassified

“…La actividad catalítica de los catalizadores sintetizados se reporta en término de conversión y selectividad a hidrocarburos livianos y pesados (ver Figura 6 y 7). La conversión se determinó mediante la relación entre la cantidad de propileno consumido y la cantidad de propileno alimentado (Wei et al, 2015). Es evidente que la conversión de los catalizadores sintetizados muestra una estrecha relación con las características de acidez encontradas mediante NH 3 -TPD.…”

Section: Actividad Catalíticaunclassified

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Síntesis hidrotermal de AlPO-5 y SAPO-5 y su evaluación catalítica en la oligomerización de propileno

Llano

Manco

Echavarría

et al. 2020

reveia

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Los aluminofosfatos y silico-aluminofosfatos son familias de mallas moleculares que presentan sistemas de poros ordenados con disposición alternada de AlO4 y PO4. Estas pueden usarse en la reacción de oligomerización de propileno debido a sus propiedades para promover la obtención de hidrocarburos de cadenas más grandes como el Diesel. En el presente trabajo se sintetizó AlPO-5 y SAPO-5 y se evaluó su actividad catalítica en la oligomerización de propileno. Las mallas moleculares obtenidas se caracterizaron por difracción de rayos X (XRD), análisis termogravimétrico (TGA), espectroscopía de absorción atómica (AA), desorción de amoniaco a temperatura programada (NH3-TPD) y microscopía electrónica de barrido (SEM). Los productos de la reacción se analizaron mediante cromatografía de gases (GC). Se obtuvo un mayor rendimiento en la proporción de oligómeros pesados en la reacción luego de las impregnaciones de Cr y Ni al material AlPO-5, siendo el material Cr 3% AlPO-5 el de mayor rendimiento.

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Synthesis and catalytic application of SAPO-5 by dry-gel conversion for the epoxidation of styrene with air

Cited by 21 publications

References 55 publications

Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH₃-SCR

Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH₃-SCR

Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Síntesis hidrotermal de AlPO-5 y SAPO-5 y su evaluación catalítica en la oligomerización de propileno

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Synthesis and catalytic application of SAPO-5 by dry-gel conversion for the epoxidation of styrene with air

Cited by 21 publications

References 55 publications

Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH3-SCR

Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH3-SCR

Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Síntesis hidrotermal de AlPO-5 y SAPO-5 y su evaluación catalítica en la oligomerización de propileno

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Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH₃-SCR

Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH₃-SCR