The synthesis of endurable B–Al–ZSM-5 catalysts with tunable acidity for methanol to propylene reaction

Yang, Yisu; Sun, Chao; Du, Junming; Yue, Yuanhe; Hua, Weiming; Zhang, Chunlei; Shen, Wei; Xu, Hualong

doi:10.1016/j.catcom.2012.03.013

Cited by 125 publications

(37 citation statements)

References 21 publications

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“…2 was 45.9%, and in another publication by Yang et al 15 , whose system is borosilicates similar to ours, the propylene selectivity is almost 45%. While impressively, the P impregnation can improve propylene selectivity which can reach over 50%, as Liu et al 3 and Lee et al 11 reported, whose data were 55.6% and 50%, while the selectivity of light olefi ns were 75% and 81.2% respectively.…”

Section: Effect Of B On the Catalytic Performance Of The Catalystmentioning

confidence: 71%

“…The weak acidity can catalyze the reaction such as alklation and methylation, which plays a vital role in olefi n formation 12 . Borosilicates with high weak acidity and low strong acidy were discussed by several researchers in different reactions 13, 14,15 . In MTG reaction, Unneberg et al 13 found that pure B-MFI expressed poor methanol conversion, but Yang et al 15 found that the B-Al-ZSM-5 catalyst with a 2.0 Al/B ratio showed a positive reaction capability in MTP reaction.…”

mentioning

confidence: 99%

“…Borosilicates with high weak acidity and low strong acidy were discussed by several researchers in different reactions 13, 14,15 . In MTG reaction, Unneberg et al 13 found that pure B-MFI expressed poor methanol conversion, but Yang et al 15 found that the B-Al-ZSM-5 catalyst with a 2.0 Al/B ratio showed a positive reaction capability in MTP reaction. Overall, boron used on ZSM-5 in various modifi cation methods in MTP reaction for comparison is rarely reported.…”

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confidence: 99%

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Effect of boron on ZSM-5 catalyst for methanol to propylene conversion

Zhang

et al. 2013

Polish Journal of Chemical Technology

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B-ZSM-5 catalysts were prepared by various modifi cation methods with boric acid, including ion-exchange, impregnation and direct synthesis. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), NH 3 -Temperature Programmed Desorption (NH 3 -TPD), N 2 adsorption-desorption, Fourier Transform Infrared spectrometry (FT-IR), 27 Al and 11 B MAS NMR spectra. The results revealed that the weak acidity of catalysts was signifi cantly increased by modifi cation. The catalytic activity was measured in a fi xed bed at 460 o C for methanol to propylene (MTP) reaction. The results of MTP reaction showed a great increment of the propylene selectivity for the boron modifi ed samples, especially for the directly synthesized B-ZSM-5 which also displayed high activity and selectivity towards C 2 = -C 4 = olefi ns. It was found that the remarkable selectivity strongly depended on the intensity of weak acidity.

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Section: Effect Of B On the Catalytic Performance Of The Catalystmentioning

confidence: 71%

mentioning

confidence: 99%

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confidence: 99%

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Effect of boron on ZSM-5 catalyst for methanol to propylene conversion

Zhang

et al. 2013

Polish Journal of Chemical Technology

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“…The declination of ethylene and the increase of propylene in this experiment could be explained by the reduction of strong acid sites, which was necessary for the formation of aromatic intermediates. It was also reported that [10,28], the weak acid sites were active sites for alkylation and methylation reaction, which might result in the increase of olefin production. In addition, relatively weak acidity hindered various side reaction such as hydrogen-transfer reactions, as a result, propylene and butylene yields increased due to fewer hydrogen-transfer reactions.…”

Section: Acid Propertymentioning

confidence: 95%

“…The acidity of catalyst plays an important role in catalytic activity through MTO reaction, and acid adjustment is the most significant affecting factor for product distribution and catalytic stability [10][11][12][13][14][15][16][17][18]. Many methods could adjust the catalysts acid properties for a better catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

et al. 2015

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H-ZSM-5-based catalyst is a recognized catalyst which is particularly selective towards the formations of light olefins in the methanol reaction. A series of H-ZSM-5 (SiO 2 /Al 2 O 3 = 38) modified with different amounts of magnesium have been investigated. All the samples were characterized by X-ray diffraction instrument (XRD), temperature-programmed desorption of NH 3 (NH 3 -TPD) and Fourier Transform Infrared Spectoscopy (FT-IR). The results indicated that the impregnation of H-ZSM-5 (SiO 2 /Al 2 O 3 = 38) zeolite with various magnesium loading amount significantly affected the strength of acid sites and decreased the concentration of both weak and strong acid sites. As a result of modification, magnesium mainly interacted with strong Brønsted acid sites, thus generated new medium strong acid sites and enhanced the yield of propylene. The optimum acid property for methanol to propylene (MTP) reaction was gotten over 4.0 Mg-ZSM-5 (4.0 wt% Mg) zeolite catalyst. The maximum yield of propylene was 10.62 wt% over 4.0 Mg-ZSM-5 zeolite catalyst by the 30 min on stream. Coke which was mostly formed on strong Brønsted acid sites, would cause the catalysts deactivation, so the reduction of strong Brønsted acid sites could enhance the catalytic stability.

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On the Role of Acidity in Bulk and Nanosheet [T]MFI (T=Al³⁺_, Ga³⁺, Fe³⁺, B³⁺) Zeolites in the Methanol‐to‐Hydrocarbons Reaction

et al. 2017

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The influence of framework substituents (Al3+, Ga3+, Fe3+ and B3+) and morphology (bulk vs. nanometer‐sized sheets) of MFI zeolites on the acidity and catalytic performance in the methanol‐to‐hydrocarbons (MTH) reaction was investigated. The Brønsted acid density and strength decreased in the order Al(OH)Si>Ga(OH)Si>Fe(OH)Si≫B(OH)Si. Pyridine 15N NMR spectra confirmed the differences in the Brønsted and Lewis acid strengths but also provided evidence for site heterogeneity in the Brønsted acid sites. Owing to the lower efficiency with which tervalent ions can be inserted into the zeolite framework, sheet‐like zeolites exhibited lower acidity than bulk zeolites. The sheet‐like Al‐containing MFI zeolite exhibited the greatest longevity as a MTH catalyst, outperforming its bulk [Al]MFI counterpart. Although the lower acidity of bulk [Ga]MFI led to a better catalytic performance than bulk [Al]MFI, the sheet‐like [Ga]MFI sample was found to be nearly inactive owing to lower and heterogeneous Brønsted acidity. All Fe‐ and B‐substituted zeolite samples displayed very low catalytic performance owing to their weak acidity. Based on the product distribution, the MTH reaction was found to be dominated by the olefins‐based catalytic cycle. The small contribution of the aromatics‐based catalytic cycle was larger for bulk zeolite than for sheet‐like zeolite, indicating that shorter residence time of aromatics can explain the lower tendency toward coking and enhanced catalyst longevity.

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The synthesis of endurable B–Al–ZSM-5 catalysts with tunable acidity for methanol to propylene reaction

Cited by 125 publications

References 21 publications

Effect of boron on ZSM-5 catalyst for methanol to propylene conversion

Effect of boron on ZSM-5 catalyst for methanol to propylene conversion

Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

On the Role of Acidity in Bulk and Nanosheet [T]MFI (T=Al³⁺_, Ga³⁺, Fe³⁺, B³⁺) Zeolites in the Methanol‐to‐Hydrocarbons Reaction

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The synthesis of endurable B–Al–ZSM-5 catalysts with tunable acidity for methanol to propylene reaction

Cited by 125 publications

References 21 publications

Effect of boron on ZSM-5 catalyst for methanol to propylene conversion

Effect of boron on ZSM-5 catalyst for methanol to propylene conversion

Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

On the Role of Acidity in Bulk and Nanosheet [T]MFI (T=Al3+, Ga3+, Fe3+, B3+) Zeolites in the Methanol‐to‐Hydrocarbons Reaction

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On the Role of Acidity in Bulk and Nanosheet [T]MFI (T=Al³⁺_, Ga³⁺, Fe³⁺, B³⁺) Zeolites in the Methanol‐to‐Hydrocarbons Reaction