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Comparison of two methods of iridium impregnation into HZSM-5 in the methanol to propylene reaction

Papari, S ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.catcom.2011.09.024
  3. Publisher: 2011
  4. Abstract:
  5. In this paper, the effects of two methods of iridium impregnation into HZSM-5 on catalyst stability, selectivity for propylene and byproducts in the conversion of methanol to propylene (MTP) were investigated in a continuous flow isotherm fixed-bed reactor. XRD, BET surface area, NH 3-TPD and ICP-AES analytical techniques were applied to define the physical and chemical characteristics of zeolites. The reaction was conducted at 480°C and 1 bar with WHSV = 1 h -1, and with an equal weight percent of methanol and water in the feed. The results revealed that iridium impregnation into HZSM-5 powder led to enhanced propylene selectivity (8%) and catalyst stability while iridium impregnation into extruded HZSM-5 drastically decreased catalyst lifetime
  6. Keywords:
  7. Iridium promoter ; Zeolite ; Analytical techniques ; BET surface area ; Catalyst lifetime ; Catalyst stability ; Continuous flows ; Fixed-bed reactors ; H-ZSM-5 ; ICP-AES ; Methanol to propylenes ; MTP ; Physical and chemical characteristics ; Propylene selectivity ; Weight percent ; XRD ; Atomic emission spectroscopy ; Byproducts ; Catalyst selectivity ; Chemical analysis ; Chemical reactors ; Impregnation ; Iridium ; Methanol ; Silicate minerals ; Zeolites ; Propylene
  8. Source: Catalysis Communications ; Volume 16, Issue 1 , 2011 , Pages 150-154 ; 15667367 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1566736711003657