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Competitive adsorption desulfurization performance over K - Doped NiY zeolite
Haizheng Li1, Xiaona Han1, Haokai Huang1
1State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
Journal of Colloid and Interface Science
|August 24, 2016
Summary
Potassium-doped NiY zeolite (KNiY) enhances gasoline desulfurization by improving nickel dispersion and reducing detrimental acid site reactions. KNiY shows superior performance, especially with olefins and aromatics present.
Area of Science:
- Catalysis
- Materials Science
- Adsorption Science
Background:
- Zeolites are crucial in catalytic processes, including desulfurization.
- Nickel-based catalysts are effective for removing sulfur compounds from fuels.
- Understanding adsorption mechanisms is key to optimizing catalyst performance.
Purpose of the Study:
- To prepare and characterize NiY and KNiY zeolites for desulfurization.
- To investigate the adsorption mechanisms influencing desulfurization performance.
- To evaluate the efficacy of KNiY as an adsorbent in the presence of gasoline model compounds.
Main Methods:
- Impregnation method for catalyst preparation.
- Characterization using XRD, BET, SEM, IR, and XPS.
- In situ FTIR for studying competitive adsorption mechanisms.
- Evaluation in a miniature fixed-bed flow reactor with gasoline model compounds.
Main Results:
- NiY and KNiY exhibited superior desulfurization compared to HY zeolite.
- KNiY demonstrated enhanced performance, particularly with olefins and aromatics.
- Potassium doping improved nickel dispersion and reducibility.
- Protonation reactions on Brønsted acid sites were weakened in KNiY, reducing pore blockage.
Conclusions:
- KNiY is a highly effective adsorbent for gasoline desulfurization.
- Potassium doping mitigates negative effects of Brønsted acid sites.
- The improved performance is attributed to enhanced active metal dispersion and modified acidity.
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