Effect of ethanol on the surface properties and n-heptane isomerization performance of Ni/SAPO-11

Lyu, Yuchao; Liu, Yuxiang; Xu, Lü; Zhao, Xinxin; Liu, Zhen; Liu, Xinmei; Zhang, Yan

doi:10.1016/j.apsusc.2016.12.230

Cited by 43 publications

(40 citation statements)

References 41 publications

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“…After the impregnation, the material was dried at 383 K for 2 h and then calcined in air at 673 K for 4 h. The loading of nickel in the Ni/SAPO-11(im) sample was 4.0 wt.% that was the same as for the Ni/SAPO-11(s) sample; the loading of Pt was 0.3 wt.%. The SAPO-11 used for the impregnation was synthesized according to the procedure reported before [13].…”

Section: Pseudomentioning

confidence: 99%

“…Therefore, the development of non-noble metal (nickel) based hydroisomerization catalysts is an appealing task. Several attempts have been made to prepare non-noble metal catalysts, and it has been shown that large metal particles are formed caused by a severe sintering which is unavoidable especially at high metal loading [12,13]. This problem restricts the optimization of the existing non-noble catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Using the impregnation method with solvents with weak polarities is an effective way to achieve this goal [16][17][18][19]. In the previous work [13], ethanol was used as solvent to support nickel on SAPO-11 and to produce Ni/SAPO-11 catalyst.The particle size of nickel monoxide (20 nm) was much smaller than that over the catalyst prepared with water as solvent (50 nm). Compared with the conventional impregnation method, a stronger metal-support interaction can be obtained through equilibrium adsorption method.…”

Section: Introductionmentioning

confidence: 99%

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Metal and acid sites instantaneously prepared over Ni/SAPO-11 bifunctional catalyst

Lyu

Yang

et al. 2019

Journal of Catalysis

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The Ni/SAPO-11 bifunctional catalyst for hydroisomerization of n-hexane was prepared via a novel synthesis method. It involved grinding of nickel source with amorphous precursors used for SAPO-11 followed by crystallization at 473 K for 24 h, thus avoiding the use of extra solvents in the synthesis. The highly dispersed nickel species and acid sites in the Ni/SAPO-11 bifunctional catalyst were instantaneouslyformed. The Ni/SAPO-11 catalyst contains framework nickel, nickel monoxide (NiO) and nickel aluminate spinel. The nickel monoxide with a size of 2-4 nm provides (de)hydrogenation function after reduction, while the framework nickel supplies more acid sites leading to an enhancedisomerization activity.The Ni/SAPO-11 catalyst shows a great synergeticeffect between the metallic nickel and acid sites with a high metal-to-acid sites ratio (C Ni /C A ) and close proximity. A single metallic nickel site is able to balance ca. 5 acid sites (C Ni /C A ≈0.19) over the Ni/SAPO-11 catalyst in n-hexane hydroisomerization.The high dispersion of nickel over the catalyst provides relatively excessive metal sites (C Ni /C A >0.19), leaving the rate limiting reaction to occur on the acid sites. The Ni/SAPO-11 catalyst exhibits comparable n-hexane conversion (71.2%) and iso-hexane yield (66.7%) to the classical Pt/SAPO-11 catalyst.With enhancing acidity, the Ni/SAPO-11 catalyst exhibits one of the highest iso-hexane yields reported in the n-hexane hydroisomerization, which render the new material as a promising candidate for the hydroisomerization catalysts.

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Section: Pseudomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal and acid sites instantaneously prepared over Ni/SAPO-11 bifunctional catalyst

Lyu

Yang

et al. 2019

Journal of Catalysis

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“…Among all the investigated catalysts, the i-C 16 selectivity of NiW/3Ni-SAPO-11 was the highest in the range of investigated reaction temperatures, and the i-C 16 selectivity of different catalysts at different reaction temperatures basically increased in the order of NiW/SAPO-11 < NiW/1Ni-SAPO-11 < NiW/2Ni-SAPO-11 < NiW/4Ni-SAPO-11 < NiW/3Ni-SAPO-11 ( Figure 10B ). This result can be explained by the fact that 3Ni-SAPO-11 possessed the most medium and strong B acid sites, which are considered as the active centers of the isomerization of the alkane skeleton ( Lyu et al, 2017 ). Meanwhile, the increase of mesoporous structures alleviated the diffusion resistance of n-hexadecane and isomeric hexadecane in the channels of SAPO-11, thus reducing the occurrence of cracking reactions.…”

Section: Resultsmentioning

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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“…Metal/SAPO-11 catalysts with 10 wt% metal loading were prepared via wetness impregnation method using ethanol as solvent. 17 A required amount of metal precursors was first dissolved in ethanol. Then, SAPO-11 was added into the solution under continuous stirring and heating at 60 C for 2 hours.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Production of hydro‐processed renewable jet fuel over SAPO ‐11‐based catalyst

Halim

Lee

Wang

et al. 2021

Intl J of Energy Research

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The role of single-metal-loaded on SAPO-11-based hydro-processing catalyst to produce renewable jet fuel was investigated in this work. First, three metals, nickel, cobalt, and molybdenum, were selected to be loaded on SAPO-11 separately and their activities were tested over the model feedstock, n-hexadecane. Among the three catalysts, nickel SAPO-11 shows the highest conversion of 70%. Second, the performance of Ni/SAPO-11, synthesized with (Ni/SAPO-11(CA)), and without (Ni/SAPO-11) citric acid was investigated with the hydro-processed alkanes derived from palm oil for the production of hydro-processed renewable jet fuel (HRJ). Catalyst metal particle size, structure, textural properties, acidity, and reduction degree were detected through transmission electron microscope (TEM), X-ray diffraction (XRD), N 2 adsorption/desorption, pyridine-adsorbed infrared spectroscopy (Py-IR), and temperature programmed reduction (TPR). The product compositions over the Ni/SAPO-11(CA) catalyst show higher selectivity toward the carbon chain length of jet fuel (C 8 -C 14 ) for 48% compared to the Ni/SAPO-11. Through the Taguchi method, the optimal operating conditions were found to be: temperature of 380 C, pressure of 52 bar, liquid hourly space velocity of 0.5 h À1 , and H 2 -to-feedstock ratio of 1250, which yielded in 73% conversion to HRJ with 6.1 isomer-to-normal (I-to-N) alkane ratio. The derived cetane number (DCN) and the flash point of HRJ were also obtained to be 56 and 56 C to confirm the compatibility of HRJ with conventional jet fuel.

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Effect of ethanol on the surface properties and n-heptane isomerization performance of Ni/SAPO-11

Cited by 43 publications

References 41 publications

Metal and acid sites instantaneously prepared over Ni/SAPO-11 bifunctional catalyst

Metal and acid sites instantaneously prepared over Ni/SAPO-11 bifunctional catalyst

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

Production of hydro‐processed renewable jet fuel over SAPO ‐11‐based catalyst

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