Efficient Synthesis of Nickel-Molybdenum/USY-Zeolite Catalyst for Eliminating Impurities (N, S, and Cl) in the Waste Plastic Pyrolysis Oil: Dispersion Effect of Active Sites by Surfactant-Assisted Melt-Infiltration

• Published in: Catalysts
• Main Authors: Eui Hyun Cho, Ki-Duk Kim, Byung Sun Yoon, Eunkyung Cho, Yeon Jeong Yu, Tuan Ngoc Phan, Sang-Goo Jeon, Chang Hyun Ko
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2023
• Subjects: hydrotreatment; hydrotreating; plastic oil; upgrading; high dispersion; Chemical technology; TP1-1185; Chemistry; QD1-999; sami
• Online Access: https://doi.org/10.3390/catal13121476; https://doaj.org/article/7b75ee812efd4fa0878a90e23cf11425

The upgrading of waste plastic pyrolysis oil (WPPO) through hydrotreating (HDT) is crucial for transforming plastic waste into chemical feedstock. The catalytic role of HDT is of paramount importance for this conversion procedure. In this study, bimetallic catalysts based on Ni and Mo were prepared using the surfactant-assisted melt-infiltration (SAMI) method, completely omitting the use of liquid solutions. Thorough analysis via X-ray diffraction, transmission electron microscopy, and hydrogen temperature-programmed reduction confirmed that the addition of Span60 surfactant effectively prevented the aggregation of Ni and Mo components, reduced the size of metal particles, and improved the dispersion of active sites on the zeolite supports. Consequently, NiMo-based catalysts incorporating Span60, synthesized using the SAMI method, exhibited a superior catalytic performance in the removal of nitrogen, sulfur, and chloride impurities from WPPO during HDT compared to those without surfactant. Specifically, the catalyst prepared with Span60 exhibited 15% higher nitrogen conversion compared to the catalyst prepared without Span60.