Efficiency of zeolite MCM-22 with different SiO2/Al2O3 molar ratios in gas phase glycerol dehydration to acrolein

Carriço, Camila Santana; Cruz, Fernanda Tátia; Santos, Maurício B. dos; Pastore, Heloise O.; Andrade, Heloysa Martins Carvalho; Mascarenhas, Artur J.S.

doi:10.1016/j.micromeso.2013.07.020

Cited by 61 publications

(42 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Zeolites have demonstrated to be highly active in glycerol dehydration to acrolein, due to the existence of strong Brönsted acid centers in the microporous structure. The catalytic data reveal that the SiO 2 /Al 2 O 3 ratio is not the only factor influencing glycerol conversion and the selectivity pattern, but there must be other factors involved in the catalytic performance, such as the type of zeolitic framework or the pore dimensions and topology [ 32 , 34 , 66 ]. In general, the catalytic activity was directly related to the amount and strength of Brönsted acid sites, although the dimensions of cavities played a key role in determining the resistance to deactivation [ 34 , 67 , 68 , 69 ].…”

Section: Mesoporous Silica-based Catalysts Used In the Glycerol Dementioning

confidence: 99%

“…However, most of the pores, mainly micropores, were filled with carbonaceous species at the initial stage of this reaction, provoking the catalyst deactivation. Carriço et al employed a MCM-22 with different SiO 2 /Al 2 O 3 molar ratios (30–80) prepared by using silica and aluminum nitrate as solid acid catalyst [ 66 ], and concluded that its crystallinity, as well as its textural properties, worsen for higher SiO 2 /Al 2 O 3 molar ratios. Although MCM-22 catalysts were essentially microporous, the presence of secondary mesopores was detected.…”

Section: Mesoporous Silica-based Catalysts Used In the Glycerol Dementioning

confidence: 99%

See 1 more Smart Citation

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

et al. 2018

View full text Add to dashboard Cite

Increasing worldwide biodiesel production has led to the generation of an important glycerol surplus, which needs to be valorized in order to improve the economic and environmental sustainability of the biodiesel industry. In this context, glycerol dehydration to acrolein by acid catalysis appears to be a potential route of glycerol valorization, since acrolein is an important intermediate for many chemical industries. The main drawback of this catalytic process is catalyst deactivation. Different alternatives have been proposed for overcoming it, such as the use of mesoporous materials in order to facilitate the diffusion of glycerol and reaction products, thus minimizing deactivation. This review compiles the main achievements of the use of mesoporous silica-containing materials that have been deployed either as a catalyst or for support in glycerol dehydration to acrolein. Thus, the effect of mesoporosity on both catalytic performance and deactivation will be discussed, as well as the blocking of pores by coke deposition.

show abstract

Section: Mesoporous Silica-based Catalysts Used In the Glycerol Dementioning

confidence: 99%

Section: Mesoporous Silica-based Catalysts Used In the Glycerol Dementioning

confidence: 99%

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Especially, on SZ11-2 and SZ11-3, glycerol conversion was up to >90%. It is generally acknowledged that the catalytic activity for the dehydration of glycerol over zeolite catalysts was depended on the amounts of acid sites [18][19]42 . Accordingly, microstructured ZSM-11 catalyst with lowest SiO2/Al2O3 molar ratio should exhibit the best activity.…”

Section: To Identify the Acidic Properties Of Microstructured Zsm-11/mentioning

confidence: 99%

Microstructured ZSM-11 Catalyst on Stainless Steel Microfibers for Improving Glycerol Dehydration to Acrolein

Ding

Wang

Zhang

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Glycerol is a byproduct from the biodiesel manufacturing. Glycerol dehydration into more valuable acrolein is desirable and essential since it improves the economics of the biodiesel production and offers a sustainable route to replace the market favorite chemical from petroleum process. Zeolites with the dominant Brønsted acid sites have been wildly used in glycerol dehydration, since Brønsted acid sites are flexible and interacting with the center hydroxyl of glycerol towards acrolein production. In this research, microstructured ZSM-11 catalysts have been developed by direct growth of zeolite crystals on a macroscopic 3D network of sinter-locked stainless-steel microfibers. It showed remarkable stability and acrolein selectivity improvement as compared to conventional ZSM-11 zeolite, due to the short residence time to limit the secondary reactions and enhanced mass transfer to minimize the coke formation. The acidity of zeolites has been optimized via tuning the SiO2/Al2O3 ratios in a wide range from 78 to 283. The highest glycerol conversions and acrolein selectivity were observed over the catalyst with a SiO2/Al2O3 molar ratio of 131. The higher temperature at 300 o C was necessary to achieve better catalytic conversion and improve the acrolein formation. At the high-flow of carrier gas, the coke formation was suppressed due to the enhanced diffusion of big-size products out of the zeolite pores.

show abstract

“…Glycerol dehydration is a catalytic reaction derived by acidic catalysts [9,10]. So far, several acid catalysts have been applied for the gas-phase selective conversion of glycerol to acrolein, including heteropolyacids [3,11,12], zeolites [4,[13][14][15][16], metal and mixed oxides [17,18], phosphates and pyrophosphates [19], sulfated zirconia [20] and sulfonic-functionalized SBA-15 [21]. Catalysts containing dominant Brønsted acid sites (BASs) were proposed for the high acrolein selectivity [10] and Lewis acid sites contribute to the production of acetol from glycerol dehydration [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Cooperation of hierarchical pores with strong Brønsted acid sites on SAPO-34 catalysts for the glycerol dehydration to acrolein

Zhao

Wang

et al. 2020

Journal of Catalysis

View full text Add to dashboard Cite

The hierarchical SAPO-34 zeolites have been prepared with the simultaneous generation of strong Brønsted acid sites (BASs) via a post-synthetic method, which allows the cooperation of the positive effects of both porous structure and acidity in the dehydration of glycerol to acrolein. The cooperation of strong BASs only in enhancing the acrolein selectivity and the hierarchical pores in improving the glycerol conversion has significantly increased the overall acrolein yield to 89.8% on the hierarchical SAPO-34 zeolite at 345 °C and WHSV = 3.7 h -1 . This kind of cooperation also limited the catalyst deactivation and prolonged the lifetime of zeolites, which is another significant challenge for glycerol dehydration. The knowledge from this research is very valuable to design the high-efficient nanoporous catalysts for hydrocarbon conversion and bio-refining.

show abstract

Efficiency of zeolite MCM-22 with different SiO2/Al2O3 molar ratios in gas phase glycerol dehydration to acrolein

Cited by 61 publications

References 32 publications

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

Microstructured ZSM-11 Catalyst on Stainless Steel Microfibers for Improving Glycerol Dehydration to Acrolein

Cooperation of hierarchical pores with strong Brønsted acid sites on SAPO-34 catalysts for the glycerol dehydration to acrolein

Contact Info

Product

Resources

About