Effect of Fe-loading and reaction temperature on the production of olefins from ethanol by Fe/H-ZSM-5 zeolite catalysts

Abstract

Lower loading of Fe (1 wt%) and higher reaction temperature (450°C) led to higher and stable selectivity of C 3? olefins by ethanol conversion using Fe/H-ZSM-5 catalysts. Carbon deposition and framework collapse of zeolite support, which may be the cause of change in selectivity of products, was suppressed in some degree.

Production of olefins from ethanol by Fe and/or P‐modified H‐ZSM‐5 zeolite catalysts

“…Therefore, to estimate carbon deposition on the catalysts, thermogravimetric (TG) analyses of catalysts after 7 h reaction were carried out (Mac Science, Japan, TG‐DTA2000) in flowing air with the temperature varied from room temperature to 800 °C at 10 °C min −1 . Framework collapse of the zeolite support, due to dealumination of the zeolite framework during reaction may also be considered a cause of catalytic deactivation,14, 15 since the zeolite acidity, essential for this reaction, is imparted by Al atoms incorporated into the zeolite framework. X‐ray diffraction (XRD) measurements of catalysts were carried out (Mac Science, M18XHF22‐SRA), and the intensity of the XRD peak of the zeolite framework before and after 7 h reaction was compared to investigate any framework collapse of the zeolite during reaction.…”

“…Ethanol is one of the main biomass products, and can be obtained by fermentation. Many researchers have reported the catalytic production of hydrocarbons from ethanol 1–16. In most cases, zeolite H‐ZSM‐5 has been used as the catalyst,1–5 with aromatic compounds being the main products.…”

“…This prompted us to investigate the effect of Fe‐loading and reaction temperature to improve selectivity for C 3+ olefins and propylene. It was found that Fe loading of 1% (w/w) and reaction temperature of 450 °C results in higher selectivity and catalytic stability 15…”

Umwandlung von Methanol in Kohlenwasserstoffe: Wie Zeolith‐Hohlräume und Porengröße die Produktselektivität bestimmen

“…Wegen des gestiegenen Interesses an Bioethanol hat die Umwandlung von Ethanol zu Kohlenwasserstoffen während der letzten 2-3 Jahre mehr Aufmerksamkeit bekommen und bietet die Mçglichkeit, Kohlenwasserstoffe wie Ethen, Propen oder Aromaten aus Bioethanol zu produzieren. [154][155][156][157][158][159][160][161][162][163][164][165][166][167][168][169][170] Beim Einsatz von Isopropylalkohol stellt sich die Situation anders dar. Dieses System ähnelt vielmehr einer Alkenoligomerisation, wie im MOGD-Prozess (Abschnitt 1.1.2).…”

Tuning of product selectivity in the conversion of ethanol to hydrocarbons over H-ZSM-5 based zeolite catalysts

“…Murata et al [8] obtained high propylene selectivity (~25%) at SiO 2 /Al 2 O 3 ratio of 50, selectivity decreasing with increasing SiO 2 / Al 2 O 3 ratio. A number of studies focus on the effect of crystal sizes [9], porous structure with NaOH-treated [10] of H-ZSM-5 as well as metal addition such as Mg, Fe, Cr, Ce, Co, Zr, Au, W, La, noble metal, Molybdenum oxide, and Mo 2 C [11][12][13][14][15][16][17][18][19][20][21] on olefins production from ethanol. In particular, while Zr- [20], W-, La- [8,18], La-and La-Mg- [19], Fe-and Ni-modification of H-ZSM-5 are reported to enhance the formation of lower olefins from ethanol [15].…”