Young Alexandre F, de Souza Julia T, Costa Antonio M L M, Romano Pedro N, García-Martínez Javier, de Almeida João M A R
Escola de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos, 149, Rio de Janeiro 21941-909, Brazil.
Laboratório de Intensificação de Processos e Catálise (LIPCAT), Universidade Federal do Rio de Janeiro, Rua Sydiney Martins Gomes dos Santos, 13 Parque Tecnológico, Cidade Universitária, Rio de Janeiro 21941-859, Brazil.
ACS Omega. 2025 Apr 9;10(15):15075-15081. doi: 10.1021/acsomega.4c10598. eCollection 2025 Apr 22.
Microwave-absorbent materials are typically blended with low-absorption solids to improve local heating efficiency in catalytic systems. However, the mixing method has a crucial effect on the additive's heating efficiency. We report here how by embedding silicon carbide (SiC) nanoparticles in ferrierite (FER) zeolite crystals during their synthesis (FER@SiC), a 2.2-fold increase in the catalytic activity for mesitylene and benzyl alcohol alkylation was achieved compared to a physical mixture of FER and SiC nanoparticles (FER/SiC). While the properties of the zeolite in the FER@SiC hybrid and SiC-free FER zeolites are almost identical, we observed a significant increase in catalytic activity under microwave heating when SiC is present within FER crystals. This enhancement is not mirrored by the physical mixture, highlighting the importance of the SiC addition method and the intimate contact between the additive and catalytic phases for effective microwave heating. Actually, FER@SiC achieves the same conversion with 40% less energy, offering insights into designing more efficient zeolite-based catalysts for sustainable chemistry.
微波吸收材料通常与低吸收性固体混合，以提高催化体系中的局部加热效率。然而，混合方法对添加剂的加热效率有至关重要的影响。我们在此报告，通过在合成过程中将碳化硅（SiC）纳米颗粒嵌入镁碱沸石（FER）晶体中（FER@SiC），与FER和SiC纳米颗粒的物理混合物（FER/SiC）相比，均三甲苯与苯甲醇烷基化反应的催化活性提高了2.2倍。虽然FER@SiC杂化材料中的沸石与不含SiC的FER沸石的性质几乎相同，但我们观察到当SiC存在于FER晶体内时，在微波加热下催化活性显著提高。这种增强在物理混合物中并未体现，突出了SiC添加方法以及添加剂与催化相之间紧密接触对于有效微波加热的重要性。实际上，FER@SiC以少40%的能量实现了相同的转化率，为设计用于可持续化学的更高效沸石基催化剂提供了思路。
