Synergetic effect between the metal and acid sites of Pd/SAPO-41 bifunctional catalysts in n-hexadecane hydroisomerization

Wei, Xiaomeng; Kikhtyanin, Oleg; Parmon, Valentin N.; Wu, Wei; Bai, Xuefeng; Zhang, Jianwei; Xiao, Linfei; Su, Xiaofang; Zhang, Yang

doi:10.1007/s10934-017-0437-7

Cited by 38 publications

(14 citation statements)

References 50 publications

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“…50 Numerous studies have specifically investigated the effect introduced by catalysts with variations in their metal−acid site balance. Wei et al 51 sought to evaluate said effect by performing n-hexadecane (n-C 16 ) hydroisomerization in a fixed reactor bed setup. The employed catalyst samples consisted of Pd/SAPO-41 with different n Me /n A ratios, which were adjusted with different loadings of Pd during preparation and with various SiO 2 /Al 2 O 3 ratios of the initial gel composition during the synthesis of SAPO-41.…”

Section: ■ Bifunctional Catalystsmentioning

confidence: 99%

“…Thus, experiments centered around two sets of samples: the first one with varying ratios of SiO 2 /Al 2 O 3 and a fixed Pd loading, and the second set with different Pd loadings and a defined SiO 2 /Al 2 O 3 ratio. Wei et al 51 found that, at a given temperature, samples prepared with different SiO 2 /Al 2 O 3 ratios exhibited decreasing conversions of n-hexadecane as the amount of Brønsted acid sites in the samples was reduced. Although samples displayed an overall high yield of iso-hexadecanes, there were noticeable differences between the selectivity values toward isohexadecanes for all catalyst samples.…”

Section: ■ Bifunctional Catalystsmentioning

confidence: 99%

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Impact of the Spatial Distribution of Active Material on Bifunctional Hydrocracking

Mirena

Thybaut

Marin

et al. 2021

Ind. Eng. Chem. Res.

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Bifunctional catalysts are the preferred choice for hydrocracking processes. Ideal hydrocracking performance is defined by quasi-instantaneous (de)hydrogenation reactions over the metal sites and limited acid catalyzed side reactions, particularly the secondary cracking of desired products. Although their performance is heavily determined by the balance in activity between metal and acid sites, the spatial arrangement between both functions also holds a significant influence. Distance represents the simplest measure of the spatial distribution of active material. Various authors have explored the influence of the distance between sites, challenging the assumption that a minimal separation is necessary for ideal hydrocracking. Experimental evidence shows the important role of diffusion in the discussion of an intimacy criterion. The balance between site dispersion and mass transport properties within the porous catalyst can serve as a guideline in the tuning or design of ideal bifunctional catalysts.

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Section: ■ Bifunctional Catalystsmentioning

confidence: 99%

Section: ■ Bifunctional Catalystsmentioning

confidence: 99%

Impact of the Spatial Distribution of Active Material on Bifunctional Hydrocracking

Mirena

Thybaut

Marin

et al. 2021

Ind. Eng. Chem. Res.

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“…24,43 Moreover, its high surface area is expected to enhance Ni dispersion, giving suitable activity and coking-resistance of the supported Ni-based catalysts. [44][45][46] As stated above, bimetallic Ni-Co/SAPO-11 catalysts with features of bifunctional sites, that is, one metal site for HDO and the other acid sites for isomerization, have great potential for FAMEs upgrading. Especially in which Co sites facilitate easier activation and cleavage of C-O bond, resulting in highly efficient activity and selectivity for HDO of FAMEs with lower hydrogen cost and seldom side reactions.…”

Section: Introductionmentioning

confidence: 98%

“…Wherein, SAPO‐11 with the moderate acid strength and shape selectivity is a preferred candidate as catalyst support for deoxygenation and isomerization 24,43 . Moreover, its high surface area is expected to enhance Ni dispersion, giving suitable activity and coking‐resistance of the supported Ni‐based catalysts 44‐46 …”

Section: Introductionmentioning

confidence: 99%

Hydrodeoxygenation of fatty acid methyl esters and simultaneous products isomerization over bimetallic Ni‐Co / SAPO ‐11 catalysts

et al. 2021

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Bimetallic Ni-Co/SAPO-11 catalysts were prepared and investigated for hydrodeoxygenation (HDO) of fatty acid methyl esters (FAMEs) and sequential isomerization of the products in a continuous fixed-bed reactor. The physicochemical properties of the catalysts were characterized by means of N 2 adsorption-desorption, temperature-programmed reduction of H 2 , temperature-programmed desorption of NH 3 , infrared spectra of adsorbed pyridine, and thermogravimetry. The conversion of FAMEs and selectivity of C 15-18 are enhanced over the bimetallic Ni-Co/SAPO-11 catalysts compared with that of the corresponding monometallic counterparts, which is attributed to the modification effect by Co species. The balance between metal Ni and Co and the acidity of the support plays an important role in the catalytic performance. The Ni-Co/SAPO-11 catalysts with composition of 3% Ni and 6% Co exhibit optimal catalytic performance, specifically the conversion of FAMEs, selectivity of C 15-18 , and isomerization ratio of C 15-18 , respectively, reaching 100.0%, 93.0%, and 36.1% at 400 C and 1

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“…The existence of long-chain n-alkanes is considered to be the direct cause of the high freezing point of diesel oil and the poor low-temperature fluidity of lubricant base oil ( Regali et al, 2014 ; Bai et al, 2019 ). The best way to solve this problem is to hydroisomerize long-chain n-alkanes in oil products to form branched isomers ( Lin et al, 2002 ; Wei et al, 2017 ). The catalyst in the process of alkane hydroisomerization is a bifunctional catalyst, which is composed of the acid support providing acid centers for the isomerization of the olefin intermediate skeleton and the active metal providing metal centers for dehydrogenation/hydrogenation activity ( Chen et al, 2019 ; L.; Yang et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nickel In Situ Modified SAPO-11 Molecular Sieves and Hydroisomerization Performance of Their NiWS Supported Catalysts

et al. 2021

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SAPO-11 molecular sieves were modified with different Ni contents by the in situ modification method. The Ni-modified SAPO-11 molecular sieves were used as the supports to prepare the corresponding NiW-supported catalysts for the hydroisomerization of n-hexadecane. The Ni-modified SAPO-11 and the corresponding NiW-supported catalysts were characterized by X-ray diffraction, scanning electron microscopy, N2 adsorption–desorption, NH3-temperature-programmed desorption, pyridine adsorbed infrared, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The results showed that Ni in situ modification preserved the crystal structure of SAPO-11; increased the BET specific surface area, mesopore volume, and medium and strong Brønsted acid amount of SAPO-11; and increased the stacking number of the active phase of the catalysts. 3Ni-SAPO-11 possessed the largest BET specific surface area, mesopore volume, and medium and strong Brønsted acid amount. NiW/3Ni-SAPO-11 possessed the highest dispersion of the active phase and the highest sulfidation degree of the active metals. The results of the hydroisomerization of n-hexadecane showed that Ni in situ modification improved the catalytic activity and selectivity of the catalysts for the hydroisomerization of n-hexadecane to varying degrees. Especially, NiW/3Ni-SAPO-11 had the highest catalytic activity and isomer selectivity, and the maximum yield of isomeric hexadecane could reach 71.18%.

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Synergetic effect between the metal and acid sites of Pd/SAPO-41 bifunctional catalysts in n-hexadecane hydroisomerization

Cited by 38 publications

References 50 publications

Impact of the Spatial Distribution of Active Material on Bifunctional Hydrocracking

Impact of the Spatial Distribution of Active Material on Bifunctional Hydrocracking

Hydrodeoxygenation of fatty acid methyl esters and simultaneous products isomerization over bimetallic Ni‐Co / SAPO ‐11 catalysts

Synthesis of Nickel In Situ Modified SAPO-11 Molecular Sieves and Hydroisomerization Performance of Their NiWS Supported Catalysts

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