Tuning the Ni site location of bifunctional Ni-based catalysts for improving the performance in ethylene oligomerization

Li, Wanting; Zhou, Cunhui; Li, Wenqian; Ge, Lixia; Yu, Gui; Qiu, Minghuang; Chen, Xinqing

doi:10.1039/d2nj01527g

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…This Ni loading is selected because previous studies have shown it to be most beneficial for the bifunctional oligomerization of ethylene. [47] The catalysts are characterized by N 2 adsorption-desorption isotherms, elemental analysis, temperature-programmed reduction, carbon monoxide (CO) pulse chemisorption, the temperature-programmed desorption of ammonia (NH 3 ), Fourier transform infrared (FTIR) spectroscopy with pyridine adsorption, and high-angle annular dark-field imaging transmission electron microscopy (HAADF-TEM), among others. The catalysts are tested during the continuous oligomerization of ethylene at 300 °C and pressures of 1-35 bar, the pulsed adsorption-desorption of ethylene at 40 °C and 1 bar, and the pulsed oligomerization of ethylene at 300 °C and 1 bar and 35 bar.…”

Section: Introductionmentioning

confidence: 99%

Ethylene Oligomerization: Unraveling the Roles of Ni Sites, Acid Sites, and Zeolite Pore Topology through Continuous and Pulsed Reactions

Abed,

Mohamed,

Hita

et al. 2023

ChemCatChem

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Herein, four catalysts, consisting of either MFI or BEA as the zeolite framework in the presence or absence of Ni, are compared to explore the individual and collective adsorptive and catalytic contributions of pore topology, Ni sites, and acid sites. Both continuous and pulsed chemisorption/reaction experiments are used to obtain a complete picture of the time‐dependent adsorption‐desorption behavior, reaction mechanisms, and deactivation steps. The methodology highlights the effect of acid sites, especially during the initial stages of reaction and in the BEA‐based catalysts, which have higher acidity at a given Si/Al ratio. In addition, Ni accelerates the reaction and improves the selectivity towards intermediate oligomers. However, the tendency for the most active Ni and acid sites to saturate and deactivate more rapidly than the less active ones may lead to misinterpretation when using the continuous reactor alone. Hence, the dominant mechanisms over the different catalyst sites and reaction times are discussed based on the combined steady and dynamic experiments.

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Section: Introductionmentioning

confidence: 99%

Ethylene Oligomerization: Unraveling the Roles of Ni Sites, Acid Sites, and Zeolite Pore Topology through Continuous and Pulsed Reactions

Abed,

Mohamed,

Hita

et al. 2023

ChemCatChem

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“…Ni-containing catalysts, microporous and mesoporous catalysts, and solid acid catalysts have been extensively studied as heterogeneous catalysts for EO; examples of such catalysts include the following: nickel ion-exchanged zeolites (e.g., Y [6,9,10], beta [11][12][13][14], ZSM-5 [15,16], MCM-22 [17,18], MCM-36 [17,18]); nickel-loaded amorphous silica-alumina (ASA) [5,[19][20][21][22][23][24][25][26][27]; Ni-exchanged cationic clay [28]; Ni-containing ordered mesoporous silicaalumina (e.g., Al-MCM-41 [29][30][31][32], Al-SBA-15 [33][34][35][36], Al-KIT-6 [37,38]); nickel sulfate (NiSO 4 ) supported on Al 2 O 3 [39][40][41][42], ASA [43], ZrO 2 [44] or TiO 2 [44]; and nickel phosphide (Ni 2 P) supported on ASA [45] or SiO 2 [46]. These catalysts are easy to handle and recycle, and they do not need any promoters or solvents (except for Ni 2 P catalysts).…”

Section: Introductionmentioning

confidence: 99%

Impacts of Ni-Loading Method on the Structure and the Catalytic Activity of NiO/SiO2-Al2O3 for Ethylene Oligomerization

Shimura,

Yoshida,

Oikawa

et al. 2023

Catalysts

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To clarify the Ni species of NiO/SiO2-Al2O3 catalysts that are active for ethylene oligomerization, 18 types of NiO/SiO2-Al2O3 were prepared using three Ni-loading methods (i.e., ion-exchange, impregnation, and homogeneous precipitation), with different Ni-loadings (1–20 wt%), and examined with respect to their structure and catalytic activity for ethylene oligomerization. Characterized by N2 adsorption, powder XRD, FE-SEM, H2-TPR, NH3-TPD, and C2H4-TPD showed that Ni species in the catalysts prepared by ion-exchange were mainly ion-exchanged Ni cations. In contrast, Ni species in the catalysts prepared by impregnation were a mixture of ion-exchanged Ni cations and NiO particles, and those in the catalysts prepared by homogeneous precipitation were all NiSiO3 particles. Catalytic-reaction tests at 300 °C and 0.1 MPa revealed the following: the ion-exchanged Ni cations showed the highest C2H4 conversion rate; the NiSiO3 particles showed a moderate reaction rate; and the NiO particles were not active for ethylene oligomerization. We concluded that the high catalytic activity of the ion-exchanged Ni cations was a result of their high dispersion and medium-strength acidity, which together promoted the adsorption and activation of ethylene on, and the desorption of oligomerization products from, the catalyst.

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Design of bi-functional Ni-zeolites for ethylene oligomerization: Controlling Ni speciation and zeolite properties by one-pot and post-synthetic Ni incorporation

Paris¹,

Moliner²,

Martı́nez³

2023

Journal of Catalysis

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Tuning the Ni site location of bifunctional Ni-based catalysts for improving the performance in ethylene oligomerization

Abstract: The location of Ni sites in the catalyst is very important on the Ni-based catalyst for the ethylene oligomerization. In this work, a series of bifunctional Ni/Al-MCM-41 samples with carefully...

Cited by 3 publications

References 38 publications

Ethylene Oligomerization: Unraveling the Roles of Ni Sites, Acid Sites, and Zeolite Pore Topology through Continuous and Pulsed Reactions

Ethylene Oligomerization: Unraveling the Roles of Ni Sites, Acid Sites, and Zeolite Pore Topology through Continuous and Pulsed Reactions

Impacts of Ni-Loading Method on the Structure and the Catalytic Activity of NiO/SiO2-Al2O3 for Ethylene Oligomerization

Design of bi-functional Ni-zeolites for ethylene oligomerization: Controlling Ni speciation and zeolite properties by one-pot and post-synthetic Ni incorporation

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