Synthesis and hydrocracking performance of small crystal NiY zeolites

SUN Jinxiao; WANG Xiaohan; WEI Qiang; ZHOU Yasong

doi:10.1016/S1872-5813(24)60432-9

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SUN Jinxiao, WANG Xiaohan, WEI Qiang, ZHOU Yasong. Synthesis and hydrocracking performance of small crystal NiY zeolites[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(24)60432-9

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SUN Jinxiao, WANG Xiaohan, WEI Qiang, ZHOU Yasong. Synthesis and hydrocracking performance of small crystal NiY zeolites[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(24)60432-9

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Synthesis and hydrocracking performance of small crystal NiY zeolites

doi: 10.1016/S1872-5813(24)60432-9

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

Funds: The project was supported by National Natural Science Foundation of China (22078360).

Received Date: 2023-12-15
Accepted Date: 2024-01-31
Rev Recd Date: 2024-01-27

Available Online: 2024-03-09

Abstract

Abstract

A series of small crystal Y-xNi zeolites with different amounts of Ni doping were synthesized by an in situ synthesis method, in which Ni precursors were introduced during the synthesis of small crystal Y zeolites. The active metal Ni was pre-impregnated into the framework of the Y zeolite. Y-xNi series zeolite and ASA were mechanically mixed as support and loaded with Ni and W to prepare Cat-xNi series hydrocracking catalysts. The hydrocracking performance was investigated using n-hexadecane as the reactant. The effects of Ni doping on the physicochemical properties of Y zeolite and catalysts were analyzed by means of characterization such as scanning electron microscopy (SEM), X-ray diffraction (XRD), N₂-adsorption desorption, NH₃ temperature programmed desorption (NH₃-TPD), H₂ temperature programmed reduction (H₂-TPR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results show that Ni mainly replaces Al into the framework of Y zeolite. The appropriate incorporation of Ni into Y zeolite increases the relative crystallinity of Y zeolite and the number of Brønsted and Lewis acid sites. However, excessive Ni incorporation is detrimental to the crystallization of Y zeolite and excessive non-framework Ni species will cover the surface Brønsted acid sites. Ni doping weakened the metal-support interactions, increased the sulfation of the active metal, the stacking number and dispersion of NiWS, and modified the matching between the metal and acid sites on the catalyst. The results of the catalyst evaluation showed that the introduction of Ni was favorable to improve the selectivity and yield of the middle distillate products (C₈−C₁₂). That is, increasing the number of Brønsted acid sites and NiWS active sites at the same time, improving the synergistic effect between the metal sites and the acid sites, improving the conversion while avoiding over-cracking, and increasing the yield of the middle distillate products. The catalyst Cat-0.2Ni had a higher n-C₁₆ conversion and C₈−C₁₂ product yield at the reaction temperature of 360 ℃, with the n-C₁₆ conversion increased by 10.2 percentage points compared with that of Cat-0Ni, and the C₈−C₁₂ product yield was 65.4%. Therefore, the pre-impregnation of active metal Ni on Y zeolite can effectively regulate the balance between the Hydrogenation and cracking performance to improve the catalytic activity and the yield of middle distillate products.
- Y zeolite,
- in-situ Ni modification,
- catalyst,
- hydrocracking,
- middle distillate

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References(53)

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