“…In recent years, many scientists have been interested in modifying natural zeolites to improve their performance as catalysts in organic reactions by treating zeolites with acids (mostly H 2 SO 4 and HCl) and transition metals such as Fe and Cu [12][13][14][15]. In the case of Cu-modified zeolites, it has been reported that copper-containing zeolites show better results compared to other zeolites with different metal transitions in oxidative dehydrogenation of methanol [16].…”