Simultaneous realization of high catalytic activity and stability for catalytic cracking of n-heptane on highly exposed (010) crystal planes of nanosheet ZSM-5 zeolite

Xiao, Xuezhang; Zhang, Yaoyuan; Jiang, Guiyuan; Liu, Jia; Han, Shanlei; Zhao, Zhen; Wang, Ruipu; Li, Cong; Chen, Xu; Duan, Aijun; Wang, Yajun; Liu, Jian; Wei, Yuechang

doi:10.1039/c6cc03320b

Cited by 50 publications

(32 citation statements)

References 37 publications

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“…Two peaks are observed at around 1,350 nm −1 (D band) and 1,620 nm −1 (G band). D band is assigned to the disorder or defects induced by the structural imperfections while G band is ascribed to the in plane C─C stretching vibrations of all pairs of sp 2 atoms in graphite layers and order degree of carbon species . The intensity ratio ( I G / I D ) evaluate the crystalline degree of carbonaceous species.…”

Section: Resultsmentioning

confidence: 99%

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

et al. 2020

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Multimetallic nanocatalysts have attracted increasing attention for steam reforming owing to highly exposed active sites, but often suffering from severe sintering. Herein, we design subnanometric Ni‐Pt bimetal clusters (ca. 1.7 nm) encapsulated in Silicalite‐1 zeolite (2Ni0.5Pt@S‐1) through ligand‐stabilized method to prevent sintering by fixing the metal into microporous channels. In the steam reforming of n‐dodecane test, 2Ni0.5Pt@S‐1 gave an excellent activity and stability with a decrease of conversion only 4% at 600°C for 4 hr, which was about a quarter that of 2Ni0.5Pt/S‐1 synthesized by co‐impregnation method, ascribing to superior sinter‐resistance of encapsulation structure. Moreover, 2Ni0.5Pt@S‐1 exhibited a higher H2 selectivity up to 69.9% than that of 2Ni0.5Pt/S‐1 (64.4%), owing to suppressed methanation reaction based on subnanometric clusters. Shape‐selective steam reforming of n‐dodecane and ofm‐xylene was also observed, because of m‐xylene could hardly diffuse into the zeolite channels due to its bulky molecular size, further preventing potential deactivation by tars in reforming process.

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Section: Resultsmentioning

confidence: 99%

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

et al. 2020

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“…Most recently, the excellent catalytic performance of HZSM‐5 nanosheet zeolites were also reported for the cracking activity of n ‐heptane with ca. 30% improvement in the hydrocarbon conversion and high selectivity for propene up to 30% . Inspired by the amazing pore‐diffusion characteristics of ZSM‐5 nanosheet, we attempted to controllably synthesize HZSM‐5 nanosheets films by directly vertical growing of nanosheets on the substrate with tailorable interlace of nanosheets.…”

Section: Methodsmentioning

confidence: 99%

Controllable fabrication and catalytic performance of nanosheet HZSM‐5 films by vertical secondary growth

et al. 2018

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Significance Nanosheet HZSM-5 film vertically grown on the substrate with the tailorable macro-and meso-pores between the layers of nanosheets is hydrothermally synthesized by seed-assisted secondary growth method. The asprepared nanosheet HZSM-5 film exhibits reaction rate enhancement up to 312% in catalytic cracking of n-dodecane as well as twice light olefins selectivity, ascribed to the better mass transfer of reactants in the hierarchical porous structure and the ultra-thin b-axis pores of nanosheets. a Si/Al ratio measured by ICP. b d c : thickness of the zeolite films counted from cross-view SEM images. c m c : zeolite loadings (mg) per surface area (cm 2 ). d m l : zeolite film mass loss after ultrasonic vibration (200W) for 30min. e r d 5 (X 0 -X t )/X 0 3 100%, X 0 and X t are the n-dodecane conversion at time of 10 and 60 min. f X5 Dw/w 0 3 100%, where w 0 and Dw are the mass of n-dodecane fed and consumed at time of 10 min. g r i 5 (w 0 -w t510 )/(m c 3 t) 3 100% (%), w 0 is the mass of n-dodecane fed, w t 5 10 is the mass of n-dodecane in the products at reaction time of 10 min, m c is the mass of catalyst in the coating, t is the reaction time (10 min).

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“…Shortening the diffusion path along the straight channel (b-axis) changes zeolite performance substantially. [17][18][19][20] An ultimate example of this strategy was the preparation of zeolite nanosheets, first prepared by Ryoo and co-workers. 8 Ryoo's group decreased the thickness of MFI-type zeolite along the b-axis to one unit cell.…”

Section: Introductionmentioning

confidence: 99%

Platelike MFI Crystals with Controlled Crystal Faces Aspect Ratio

et al. 2021

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Zeolite crystals offering a short diffusion pathway through the pore network are highly desired for a number of catalytic and molecule separation applications. Herein, we develop a simple synthetic strategy toward reducing the thickness along b-axis of MFI-type crystals, thus providing a short diffusion path along the straight channel. Our approach combines preliminary aging and a fluoride-assisted low-temperature crystallization. The synthesized MFI crystals are in the micron-size range along a-and c-axis, while the thickness along the b-axis is a few tens of nanometers. The synthesis parameters controlling the formation of plate-like zeolite are studied, and the factors controlling the zeolite growth identified. The synthesis strategy works equally well with all-silica MFI (silicalite-1) and its Al-and Ga-containing derivatives. The catalytic activity of plate-like ZSM-5 in the methanol-to-hydrocarbons (MTH) reaction is compared with a commercial nano-sized ZSM-5 sample, as the plate-like ZSM-5 exhibits a substantially extended lifetime. The synthesis of plate-like MFI crystals is successfully scaled up to a kilogram scale.

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Simultaneous realization of high catalytic activity and stability for catalytic cracking of n-heptane on highly exposed (010) crystal planes of nanosheet ZSM-5 zeolite

Cited by 50 publications

References 37 publications

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

Controllable fabrication and catalytic performance of nanosheet HZSM‐5 films by vertical secondary growth

Platelike MFI Crystals with Controlled Crystal Faces Aspect Ratio

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