WebApr 11, 2024 · However, dealumination seems inevitable as well in small pore zeolites [23, 24].After hydrothermal ageing at 800°C, 27 Al MAS NMR characterisation showed that the peak intensity of tetrahedral coordinated Al (framework Al) in Cu SSZ-13 decreased, indicating dealumination. In addition, a drastic decrease in specific surface area (by … WebJun 1, 1996 · Dealumination of HZSM-5 zeolites. II. Methanol to gasoline conversion Full Record Related Research Abstract Changes in the structure and properties of HZSM-5 …
H-ZSM-5 Zeolite Synthesis by Sourcing Silica from the Wheat ... - Hindawi
WebJan 1, 1997 · The acid dealumination of various samples of ZSM-5 is studied using mineral acids as the dealuminating agent. Apart from the synthesis method of the ZSM-5, the acid … WebThe further decrease in the cracking activity (for more severely dealuminated zeolites) may be explained by the decrease in both concentration and acidic strength of Brönsted sites. … tally fashion
Deactivation of Cu SCR catalysts based on small-pore SSZ-13 zeolites…
WebJun 1, 2024 · Dealumination is performed by leaching with an acidic solution that leads to the extraction of aluminum from the zeolite. Strong acids such as HCl [12, 13], H 2 SO 4 [14], and HNO 3 caused... WebApr 12, 2024 · In this study, LDPE (M W ∼4,000), PP (M W ∼35,000), and PS (M W ∼12,000) were selected as single-use plastic feedstocks which were bought from Sigma-Aldrich without further treatment. ZSM-5 (CBV 3024E, SiO 2 /Al 2 O 3 mole ratio is 30, Zeolyst) was used as the catalyst for microwave-driven plastic depolymerization. WebThe thermal analysis of crystalline zeolite ZSM-5 precurcors with different Si/Al ratios was carried out in a nitrogen atmosphere. Different interactions between tetrapropylammonium species and the zeolitic environment were evidenced, depending on the Al content of the crystalline precursors. The results support the mechanism of ZSM-5 formation through a … two types of weathering and list all examples