Hydroisomerization of <i>n</i>-hexadecane over a Pd–Ni<sub>2</sub>P/SAPO-31 bifunctional catalyst: synergistic effects of bimetallic active sites

Zhang, Yang; Wang, Wei; Jiang, Xin; Su, Xiaofang; Kikhtyanin, Oleg; Wu, Wei

doi:10.1039/c7cy02106b

Cited by 41 publications

(41 citation statements)

References 56 publications

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“…In contrast, the amount of Lewis acid sites significantly increased after Pt loading, leading to an increase in total acid sites. The decrease of Brønsted acid amount after loading Pt on S‐11 should be ascribed to the blocking of the pore by Pt . Lower Brønsted acid content in I‐0.15Pt/S‐11 than that in V‐0.15Pt/S‐11 is relative to the more blocking of large Pt on channels, consistent with N 2 adsorption–desorption measurements.…”

Section: Resultssupporting

confidence: 77%

“…For I‐0.15Pt/S‐11, the monobranched alkene intermediates may continue to undergo successive isomerization and even cracking due to lack of synergy of metal sites and acid sites from large size and poor dispersion of Pt. Multibranched isomers are more prone to cracking, thus resulting in an increase in cracking products . For V‐0.15Pt/S‐11, the multibranched intermediates can still be easily hydrogenated and diffuse smoothly, thus avoiding excessive cracking benefited from the effective synergy of bifunctional sites.…”

Section: Resultsmentioning

confidence: 99%

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Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

et al. 2019

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The significant increase of catalytic efficiency while remaining low Pt usage is constantly pursued, but remains a challenge. Here, a “vacuum‐assisted” (VA) process toward Pt clusters dispersed on SAPO‐11 (S‐11) is shown for a high‐effective hydroisomerization of n‐C16. The VA can make effective trapping of the Pt precursor on S‐11 due to intensive capillary action, being conductive to stabilize and disperse Pt cluster (≈1 nm) on S‐11 (V‐Pt/S‐11) for promoting synergy of Pt sites and acid sites on S‐11. The test indicates excellent catalytic activity and stability of trace Pt clusters (0.15 wt%, even lower, 0.035 wt%) on S‐11 (≈94.4% isomer selectivity at 94.3% conversion), much superior to I‐0.15 wt% Pt/S‐11 from traditional impregnation routes (≈88% selectivity at 90% conversion) and ever reported catalysts. The V‐Pt/S‐11 is also superior for the hydroisomerization of catalytic diesel oil with a decrease of freezing point up to 40 °C after hydroisomerization. The superior performance is attributed to the exposure of high acid density due to little coverage of Pt cluster on S‐11, high dispersion of Pt leading to form more metal–acid bifunctional sites, and enhanced (de)hydrogenation ability of Pt clusters. All of them can promote the effective synergy of metal sites (Pt) and acid sites.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

et al. 2019

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“…Transition metal phosphides (TMPs) are studied in catalytic and energy-storage fields, such as electro-catalytic hydrogen evolution reaction and other catalytic reactions [1][2][3][4][5][6][7][8][9]. The surface of the phosphides can be oxidized when a certain voltage is applied in an alkaline environment in accompany with the acquisition and loss of electrons.…”

Section: Introductionmentioning

confidence: 99%

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Zhang

et al. 2019

Sci. China Mater.

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The design of the electrode with high-area and mass capacitance is important for the practical application of supercapacitors. Here, we fabricated the porous NiCoP nanowalls supported by Ni foam (NiCo-P/NF) for supercapacitors with win-win high-area and mass capacitance. The NiCoOH nanowall precursor was prepared by controlling the deposition rate of Ni 2+ and Co 2+ on NF through a sodium acetate-assisted (floride-free) process. After the phosphorization, the NiCo-P nanowalls formed with high loading about 8.6 mg cm −2 on NF. The electrode combined several advantages favorable for energy storage: the plentiful pores beneficial for ion transport, the nanowalls for easy accommodation of electrolyte, good conductivity of NiCo-P for easy transport of electrons. As expected, the NiCo-P/NF exhibited a high specific mass capacitance (1,861 F g −1 at 1 A g −1 , 1,070 F g −1 at 10 A g −1 ), and high area capacitance (17.31 F cm −2 at 5 mA cm −2 and 10 F cm −2 at 100 mA cm −2 ). The asymmetric supercapacitor (ASC) composed of NiCo-P/ NF positive electrode coupled with commercial active carbon negative electrode exhibited a high energy density of 44.9 W h kg −1 at a power density of 750 W kg −1 . The ASC can easily drive fans, electronic watch and LED lamps, implying their potential for the practical application.

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“…44 The classic dual-functional mechanism is currently used to guide the design of the catalysis and investigate the hydroisomerization reactions. 13−15 The process of hydroisomerization of n -dodecane on Pt/SAPO-11 with bifunctional active sites was shown in Figure 10. The n -dodecane is first adsorbed on the metal of Pt and dehydration to n -dodecene.…”

Section: Resultsmentioning

confidence: 99%

“…The key to make this combination become an excellent catalyst to achieve the above goal is to balance the acidic and the metallic properties of the catalysts. 13−15…”

Section: Introductionmentioning

confidence: 99%

Effect of Metal Precursors on the Performance of Pt/SAPO-11 Catalysts for n-Dodecane Hydroisomerization

et al. 2019

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Pt(NH 3 ) 4 (NO 3 ) 2 , Pt(NH 3 ) 4 (Ac) 2 , (NH 4 ) 2 PtCl 4 , and H 2 PtCl 6 were used to prepare Pt/SAPO-11 catalysts to investigate the effect of Pt precursors on the hydroisomerization of n -dodecane. The catalyst derived from Pt(NH 3 ) 4 (NO 3 ) 2 displays the best hydroisomerization activity and selectivity among these precursors. The hydroisomerization conversion of n -dodecane is affected by the platinum particle size, platinum dispersion, the location of platinum, and the valence state of platinum. The selectivity of n -dodecane is determined by the number of Brønsted acid sites and Pt crystal planes. These conclusions are verified by combining transmission electron microscopy, high-resolution transmission electron microscopy, hydrogen temperature programmed reduction, NH 3 -temperature programmed desorption, and Py-IR studies. The catalyst prepared with Pt(NH 3 ) 4 (NO 3 ) 2 as the precursor exhibits the smallest platinum particle size and the highest platinum dispersion. Most of the platinum particles are supported on the external surface of SAPO-11 with the Pt(111) crystal face. Such a catalyst also possesses a suitable number of Brønsted acid sites and then displays the best catalytic performance. Obviously, the use of various precursors for the Pt-based catalyst can significantly affect the performance of Pt/SAPO-11 for the hydroisomerization of n -dodecane.

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Hydroisomerization of n-hexadecane over a Pd–Ni₂P/SAPO-31 bifunctional catalyst: synergistic effects of bimetallic active sites

Abstract: The Pd-Ni2P/SAPO-31 catalyst shows excellent performance in n-hexadecane hydroisomerization due to the synergistic effects of Pd–Ni2P and improved metal/acid balance.

Cited by 41 publications

References 56 publications

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Effect of Metal Precursors on the Performance of Pt/SAPO-11 Catalysts for n-Dodecane Hydroisomerization

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Hydroisomerization of n-hexadecane over a Pd–Ni2P/SAPO-31 bifunctional catalyst: synergistic effects of bimetallic active sites

Abstract: The Pd-Ni2P/SAPO-31 catalyst shows excellent performance in n-hexadecane hydroisomerization due to the synergistic effects of Pd–Ni2P and improved metal/acid balance.

Cited by 41 publications

References 56 publications

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Effect of Metal Precursors on the Performance of Pt/SAPO-11 Catalysts for n-Dodecane Hydroisomerization

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Hydroisomerization of n-hexadecane over a Pd–Ni₂P/SAPO-31 bifunctional catalyst: synergistic effects of bimetallic active sites