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

Paper ID Volume ID Publish Year Pages File Format Full-Text
51580 46847 2011 5 PDF Available
Title
Comparison of two methods of iridium impregnation into HZSM-5 in the methanol to propylene reaction
Abstract

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, NH3-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.

Highlight► A comparison between two methods of HZSM-5 impregnation by iridium ► Effect of presence of iridium metal on propylene selectivity in MTP reaction ► Increasing the methanol conversion by iridium incorporation into the zeolites ► Inefficacity of iridium incorporation into extruded HZSM-5 ► Effectiveness of iridium incorporation into extruded zeolite

Keywords
MTP; Zeolite; HZSM-5; Iridium promoter; Propylene
First Page Preview
Comparison of two methods of iridium impregnation into HZSM-5 in the methanol to propylene reaction
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 16, Issue 1, 30 November 2011, Pages 150–154
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis