绿色模板化氮化SAPO-34催化剂用于提高MTO性能

Q2 Materials Science

Current Research in Green and Sustainable Chemistry Pub Date : 2025-01-01 DOI:10.1016/j.crgsc.2025.100463

Mohammad Javad Emami, Jafar Towfighi Darian, Masoud Safari Yazd

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引用次数: 0

摘要

以咖啡粉为原料，采用绿色模板法合成氮改性SAPO-34催化剂（SPG），以提高甲醇制烯烃（MTO）工艺的效率和稳定性。与传统的SAPO-34 （SP）相比，SPG具有更高的选择性、稳定性和使用寿命。表征表明晶体尺寸更小（38 nm对46 nm），氮掺入增加，活性位点分布均匀，提高了催化活性。优化后的SPG酸度提高了甲醇转化率，同时减少了焦炭的形成。MD模拟结果表明，氮改性提高了甲醇的滞留率和吸附能，促进了乙烯的生成。性能测试表明，SPG在360分钟内实现了92.6%的轻烯烃选择性，优于SP。此外，SPG表现出优异的水热稳定性和减少焦炭沉积，使其成为一种有前途的环保和经济高效的工业MTO催化剂。

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A green templated and nitrogen-incorporated SAPO-34 catalyst for enhanced MTO performance

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.

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