Synergetic and efficient alkylation of benzene with ethane over Pt/ZSM-5 nanosheet bifunctional catalysts to ethylbenzene

Zhou, Ajuan; Zhang, Jiaxing; Yang, Hong; Shang, Shujie; Zhang, Anfeng; Chen, Song; Guo, Xianghai

doi:10.1016/j.fuel.2023.127764

Cited by 11 publications

(14 citation statements)

References 52 publications

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“…In addition, the straight channels are along the thickness of these nanosheets and thus of the length of ∼22 nm. 28 As observed in Figure 2d− f, the Pt particles appear tiny, numerous, and well-dispersed on the surface of Z5−30 nanosheets in all three Pt-loaded samples. Noticeably, there seem to be clearly more Pt particles in IWI/0.2, followed by IE/0.2 and hardly in EN/0.2.…”

Section: Methodssupporting

confidence: 56%

“…It is noteworthy that our previous studies of the Pt/ZSM-5 bifunctional catalysts have found that even under Pt loading, the acidity of the ZSM-5 support appears to be more than sufficient for the reactions. 28 Consequently, we believe that Pt locations and their intimacy with the support play more important roles in dictating the catalytic activity of the catalyst.…”

Section: Methodsmentioning

confidence: 99%

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Tuning Pt Location and Intimacy between Pt–Acid Active Sites in Pt/ZSM-5 Bifunctional Catalysts for Effective Alkylation of Benzene with Ethane

Zhou,

Zhang,

Shang

et al. 2024

Ind. Eng. Chem. Res.

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The rational design of bifunctional catalysts is an effective strategy for improving the reaction performance. In this work, three Pt/ZSM-5 catalysts (all of the loading of platinum is relatively low, about 0.2 wt %) were prepared through three different preparation methods, and then their application in the alkylation of benzene with ethane to ethylbenzene was studied. Among the three catalysts, the one prepared by the in situ encapsulation method contains nanoparticles of Pt mainly located in the interior of ZSM-5, and there is a low intimacy between the Pt−acid sites on the support. This catalyst shows the lowest benzene conversion. On the other hand, for the catalyst prepared by the impregnation method, the platinum particles are mainly located on the external surfaces of ZSM-5, and there is high intimacy between the Pt−acid active sites. This catalyst delivers high benzene conversion but low ethylbenzene selectivity due to easy access to the Pt−acid active sites for the side reactions. The best catalytic activity with a 90.6% ethylbenzene selectivity and a benzene conversion of 9.8% is achieved by the catalyst produced by ion exchange. This catalyst contains Pt located on both the external and interior of ZSM-5, with the highest intimacy between the Pt− acid active sites. It achieves not only high benzene conversion but also high ethylbenzene selectivity. This study reveals the relationship between the location and intimacy between two active sites of Pt/ZSM-5 catalysts in alkylation reactions and demonstrates a great significance for the rational design of other bifunctional or multifunctional metal−zeolite catalysts.

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Section: Methodssupporting

confidence: 56%

Section: Methodsmentioning

confidence: 99%

Tuning Pt Location and Intimacy between Pt–Acid Active Sites in Pt/ZSM-5 Bifunctional Catalysts for Effective Alkylation of Benzene with Ethane

Zhou,

Zhang,

Shang

et al. 2024

Ind. Eng. Chem. Res.

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“…As observed in Figure , 8Ni/Z5–18 with the lowest Si/Al ratio shows a higher reduction temperature of the low-temperature peak. The explanation for this result is the larger number of [Si–(OH)–Al] in the Z5–18 zeolite support, which can strongly anchor the nickel species . Additionally, the reduction peaks shift to higher temperatures when the Si to Al ratios increase from 85 to ∞.…”

Section: Resultsmentioning

confidence: 94%

“…The explanation for this result is the larger number of [Si−(OH)−Al] in the Z5−18 zeolite support, which can strongly anchor the nickel species. 37 Additionally, the reduction peaks shift to higher temperatures when the Si to Al ratios increase from 85 to ∞. The reason for the phenomenon is ascribed to the increasing particle sizes of NiO where the bulk species are more difficult to access the hydrogen for reduction.…”

Section: T H Imentioning

confidence: 99%

Role of Acid Centers over Ni/ZSM-5 Catalysts for Hydrodeoxygenation of Methyl Laurate to Biojet Fuels

Wang,

Li,

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Acidity of supports always plays a key role in the determination of dispersion and electron density of metal components and then the catalytic behavior of bifunctional catalysts for deoxygenation of biomass-based resources. Herein, Ni/ZSM-5 catalysts with various Si/Al ratios and acidity were synthesized, and the role of acid centers in the deoxygenation of methyl laurate (ML) was discussed. The decreasing Si/Al ratios promote dispersion of Ni due to the anchoring effect of framework Al to nickel species. It also increases the electron density of Ni, which not only benefits the activation of hydrogen but also curbs the cleavage of C−CHO bonds. All of these accelerate ML transformation and preferentially promote the hydrodeoxygenation (HDO) route instead of decarboxylation (DCO 2 ) or decarbonylation ones. The metal centers play a key role in the hydrogenolysis of ML and the hydrogenation of resultant fatty acids, while the acid centers can facilitate these processes. Besides, suitable acidity of the catalyst would increase selectivity to target alkanes and isomerized ones for biojet fuels by enhancing the HDO routes. However, excessive acid centers favor cracking reactions, reducing the selectivity of target products. This work contributes a profound understanding of the role of acid centers in the deoxygenation of ML into biojet fuels and can be extended to other bifunctional deoxygenation catalysts.

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“…The Pt-loaded samples, Pt/ HZ48-Al-pre and Pt/HZ48-Al-post, inherited similar acidic comparison results from the support (Figure 5b). For more accurate peak fitting, we introduced a peak at ca.290−300 °C, which was referred as medium strong acid, 37 and the quantification results were listed in Table 3. There was a slight difference in the total acidity, which was attributed to different framework aluminum content of the two H-form samples.…”

Section: Effect Of Aluminum Source Introducing Sequence Of the Seeded...mentioning

confidence: 99%

Ultrafast Synthesis and Regulating Al Status of Mesoporous ZSM-48 Zeolite via a Pretreated-Seed-Solution-Assisted Strategy

Shang

Ren

Liu

et al. 2023

Crystal Growth & Design

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Ultrafast synthesis of nanocrystal assembled mesoporous ZSM-48 zeolite spheres of highly crystalline was achieved within 1.5 h by using pretreated-seed-solution-assisted strategy. Interestingly, by altering the introducing sequence of aluminum source (in the pretreated seed solution or in the synthesis gel), the obtained ZSM-48 with similar particle size and total acid sites exhibited quite different crystallization behavior and acid property in terms of Al distribution and acid strength, because of the distinct local microenvironment (Al-rich or Al-free) in the pretreated seed solution. The HZ48-Al-pre (introduce an Al source to the pretreated seed solution) had more framework Al(IV) content and stronger acid strength than that of the HZ48-Al-post (synthesized by the Al-free pretreated seed solution). The corresponding Pt supported catalysts showed a great difference in the n-C 12 hydroisomerization reation. The Pt/HZ48-Al-pre catalyst had a very low selectivity (41.1%), and the maximum iso-yield was only 35.5%. However, the ultrafast synthesizedPt/HZ48-Al-post-1.5h catalyst exhibited a superior selectivity (90.1%) with a total i-C 12 yield of 82.3% at 330 °C, which was a high level in the exist literature reports.

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Synergetic and efficient alkylation of benzene with ethane over Pt/ZSM-5 nanosheet bifunctional catalysts to ethylbenzene

Cited by 11 publications

References 52 publications

Tuning Pt Location and Intimacy between Pt–Acid Active Sites in Pt/ZSM-5 Bifunctional Catalysts for Effective Alkylation of Benzene with Ethane

Tuning Pt Location and Intimacy between Pt–Acid Active Sites in Pt/ZSM-5 Bifunctional Catalysts for Effective Alkylation of Benzene with Ethane

Role of Acid Centers over Ni/ZSM-5 Catalysts for Hydrodeoxygenation of Methyl Laurate to Biojet Fuels

Ultrafast Synthesis and Regulating Al Status of Mesoporous ZSM-48 Zeolite via a Pretreated-Seed-Solution-Assisted Strategy

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