Combining wet impregnation and dry sputtering to prepare highly-active CoPd/H-ZSM5 ternary catalysts applied for tandem catalytic synthesis of isoparaffins

Sun, Jian; Niu, Wenqi; Taguchi, Akira; Abe, Takayuki; Yoneyama, Yoshiharu; Tsubaki, Noritatsu

doi:10.1039/c3cy01091k

Cited by 32 publications

(19 citation statements)

References 23 publications

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“…The reduction behavior of the bimodal catalysts with different pore‐forming agents is investigated in Figure . The two‐stage reduction regions of 200–284 o C and 294–500 o C are assigned to the typical reduction of Co(III) to Co(II) (Co 3 O 4 + H 2 → 3CoO + H 2 O) and Co(II) to Co(0) (CoO + H 2 → Co 0 + H 2 O), respectively . The reduction peak of 294–299 o C is probably attributed to the reduction of Co(II) species dispersed outside the enlarged small pores, while that of 310–316 o C is assigned to the reduction of Co species(II) inside the small pores.…”

Section: Resultsmentioning

confidence: 98%

Expanding Small Pore Size of the Bimodal Catalyst with Surfactant and Its Application in Slurry-phase Fischer-Tropsch Synthesis

Ishihara¹,

Sun

et al. 2016

ChemistrySelect

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The pore size effect on the reaction activity and hydrocarbon selectivities of Fischer‐Tropsch synthesis (FTS) is investigated on the Co‐based bimodal catalysts with tunable small pores and large pores, prepared by employing various surfactants, such as PEG400, PEG600 and P123. The small pore size is enlarged to 4–10 nm, higher than conventional bimodal catalysts prepared by nanoparticles from sol or solution of support precursor. The depth of small pores can also be enlarged by increasing the ZrSiO4 loading amount of the Zr−Si bimodal support, promoting dispersion of cobalt nano‐crystallite. The higher cobalt reduction degree is achieved on these small pore enlarged catalysts, enhancing the activity of FTS. The P123‐assisted one exhibits the highest CO conversion owing to its largest small pore size. The enlarged small pore of 5 nm prepared with PEG400 is the optimized pore size to accelerate the carbon chain growth reaction, producing more heavy hydrocarbons compared to the others.

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Section: Resultsmentioning

confidence: 98%

Expanding Small Pore Size of the Bimodal Catalyst with Surfactant and Its Application in Slurry-phase Fischer-Tropsch Synthesis

Ishihara¹,

Sun

et al. 2016

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“…The direct synthesis of light isoparaffin from syngas via FTS is a typical tandem reaction. The most used catalyst is the hybrid catalyst prepared by mixing the FTS catalyst and zeolite catalyst . The FTS catalyst first converts the syngas to linear hydrocarbons, which then migrate to the acidic sites of zeolite catalyst for further hydrocracking and isomerization to form branched hydrocarbons.…”

Section: Fischer‐tropsch Synthesismentioning

confidence: 99%

“…In general, Pd can be introduced to the zeolite shell by a simple impregnation method. However, the direct impregnation of Pd over zeolite capsule catalyst often results in a difficult reduction of Pd cation due to the strong interaction with the zeolite surface, which was unfavorable for the activity of the catalyst ,,. To solve this problem, a novel method, named polygonal barrel‐sputtering, was applied to load the Pd onto the surface of H‐ZSM‐5 zeolite shell encapsulated Co/SiO 2 catalyst .…”

Section: Fischer‐tropsch Synthesismentioning

confidence: 99%

Design and Synthesis of Powerful Capsule Catalysts Aimed at Applications in C1 Chemistry and Biomass Conversion

Bao

Tsubaki

2017

The Chemical Record

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Tandem catalytic reaction is a promising strategy to improve the utilization efficiency of energy and resources. The conventional hybrid catalysts cannot readily realize the precisely controlled synthesis of target products due to the unrestricted, open reaction environment. Assembling the hybrid catalyst with multiple active sites into core-shell structured capsule catalyst is one of the most effective ways to enhance the selectivity of desired products during a tandem catalysis process, because the core-shell structure offers a space-confined reaction field and synergistic effect. This review describes our recent progresses on the design and synthesis of coreshell structured zeolite capsule catalysts developed for C1 chemistry and biomass conversion. The various synthesis methods for constructing the well-defined zeolite capsule catalysts are described in detail. The applications of the capsule catalysts in catalysis, including the middle isoparaffins synthesis from syngas, one-step synthesis of dimethyl ether, and liquid-phase tandem reaction of glycerol conversion, are discussed, respectively. Our perspectives regarding the challenges and opportunities for future research in the field are also provided.

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“…Bifunctional catalysts with the combination of the conventional FTS catalyst and acidic zeolite have been studied widely for direct synthesis of middle isoparaffin [4][5][6][7][8][9][10][11]. Until now, there are three kinds of bifunctional catalysts for direct synthesis of middle isoparaffin: physical mixture catalysts [12,13], zeolite-supported metal catalysts [14,15] and capsule or coated catalysts with the conventional FTS catalyst core and zeolite shell [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Tunable isoparaffin and olefin yields in Fischer–Tropsch synthesis achieved by a novel iron-based micro-capsule catalyst

et al. 2015

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Please cite this article in press as: C. Xing, et al., Tunable isoparaffin and olefin yields in Fischer-Tropsch synthesis achieved by a novel iron-based micro-capsule catalyst, Catal. Today (2014), http://dx. a b s t r a c tA novel iron-based micro-capsule catalyst with interior Fe/Silica core and exterior H-ZSM-5 shell was synthesized via in-situ crystallization route on Fe/SBA-15 catalyst by using steam-assisted crystallization (SAC) process and evaluated for direct synthesis of middle isoparaffin from syngas in a fixed-bed reactor. Structure characterization indicated that the size of micro-capsule catalyst was about 1-2 m. According to activity test results, original Fe/SBA-15 catalyst exhibited a low selectivity of isoparaffin as 8.2%. But the as-prepared micro-capsule catalyst achieved an excellent performance for isoparaffin synthesis with the selectivity up to 46.5%. Meanwhile, the physical mixture catalyst (Fe/SBA-15 and H-ZSM-5) exhibited lower isoparaffin selectivity with 33.9% than that of the micro-capsule catalyst. The spatial confinement effect of the micro-capsule catalyst played an important role for the high selectivity of isoparaffin synthesis.

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Combining wet impregnation and dry sputtering to prepare highly-active CoPd/H-ZSM5 ternary catalysts applied for tandem catalytic synthesis of isoparaffins

Cited by 32 publications

References 23 publications

Expanding Small Pore Size of the Bimodal Catalyst with Surfactant and Its Application in Slurry-phase Fischer-Tropsch Synthesis

Expanding Small Pore Size of the Bimodal Catalyst with Surfactant and Its Application in Slurry-phase Fischer-Tropsch Synthesis

Design and Synthesis of Powerful Capsule Catalysts Aimed at Applications in C1 Chemistry and Biomass Conversion

Tunable isoparaffin and olefin yields in Fischer–Tropsch synthesis achieved by a novel iron-based micro-capsule catalyst

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