Nanostructured catalysts for BIOEthanol transformation to industrially important chemicals

Abstract

Utilization of a low-cost biomaterial, such as bioethanol, to produce value–added compounds for current industry has been investigated. This work is focused on the catalytic transformation of bioethanol into industrially significant alkenes. Catalytic transformation of ethanol was studied using catalysts based mainly on nanostructured materials as Mg-Al hydrotalcites, sepiolites and zeolites doped with Cu, K, Sr, Zn and Mn. The catalytic tests were carried out in a plug-flow reactor in the temperature range of 350—550 °C. Undoped zeolites promote acid-catalyzed dehydration of ethanol, while in case of basic catalysts, such as hydrotalcites, the product distribution is shifted toward butadiene. The impact of the hydrotalcites preparation method on their structure and catalytic activity is reported. It was found that hydrotalcite with well-developed layered structure, prepared by slow hydrolysis, promotes the formation of butadiene (with butadiene yield of 28.2 % at 400 °C vs. ethylene yield of 17.2 % at 550 °C).

Bio‐Synthesis of Silver Nanoparticles Decorated on Hydrotalcite using Psidium Guajava Leaf Extract and Its Anti‐Bacterial Effect

“…To evaluate the stability of HT-AgNPs, the antibacterial activity of this sample after stored at the ambient temperature for 30 days was assessed. [52] As observsing from Table 5 and Figure 12, it can be seen that the HTÀ Ag10 still inhibit well the growth of E. coli and S. aureus bacteria. This result confirmed the antibacterial activity of HTÀ Ag was maintained after a long time of storage, suggesting that the HTÀ Ag10 have a high stability during 30 days of storage.…”

“…To evaluate the stability of HT‐AgNPs, the antibacterial activity of this sample after stored at the ambient temperature for 30 days was assessed [52] . As observsing from Table 5 and Figure 12, it can be seen that the HT−Ag10 still inhibit well the growth of E. coli and S. aureus bacteria.…”

“…Conversely, according to refs. [5,8,52]. HT Mg/Al co -precipitated with NaCO 3 showed an irregular morphology with only a slight or no indication of lamellar structures.…”