A green templated and nitrogen-incorporated SAPO-34 catalyst for enhanced MTO performance
Mohammad Javad Emami, Jafar Towfighi Darian, Masoud Safari Yazd
Abstract
This study presents a nitrogen-modified SAPO-34 catalyst (SPG), synthesized via a green templated method using coffee powder, to improve the efficiency and stability of the methanol-to-olefins (MTO) process. Compared to conventional SAPO-34 (SP), SPG demonstrates enhanced selectivity, stability, and longevity. Characterization shows a smaller crystallite size (38 nm vs. 46 nm), increased nitrogen incorporation, and well-distributed active sites, improving catalytic activity. Optimized acidity in SPG enhances methanol conversion while reducing coke formation. MD simulations reveal that nitrogen modification improves methanol retention and adsorption energy , promoting ethylene production. Performance tests show SPG achieving 92.6 % light olefin selectivity for 360 min, outperforming SP. Additionally, SPG exhibits superior hydrothermal stability and reduced coke deposition, making it a promising eco-friendly and cost-effective catalyst for industrial MTO applications.