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Influence of the pretreatment method on the properties of trimetallic Pt–Ir–Ge/Al2O3 prepared by catalytic reduction

Paper ID Volume ID Publish Year Pages File Format Full-Text
43422 45969 2007 9 PDF Available
Title
Influence of the pretreatment method on the properties of trimetallic Pt–Ir–Ge/Al2O3 prepared by catalytic reduction
Abstract

Pt–Ir/Al2O3 catalysts were modified by addition of an inactive metal, germanium, in order to suppress the strong hydrogenolytic activity of this type of naphtha reforming catalyst. The trimetallic systems were prepared by a surface redox reaction called catalytic reduction method. The objective of the study is to examine the influence of the Ge addition step and of the activation step (calcination–reduction or only reduction) of these systems on their catalytic properties. The Pt–Ir metallic function deposited on alumina does not suffer a significant sintering of the particles neither during the catalytic reduction procedure (i.e. an immersion in acidic medium under hydrogen flow) nor during the final activation step. On the other hand, an inhibition of the acidic function of the bimetallic parent catalysts is observed after the catalytic reduction treatment. Ge affects both the metal and the acidic functions of the Pt–Ir–Ge trimetallic catalysts, the effects depending on the deposited Ge content and on the activation treatment. The best catalytic properties are obtained for the Pt–Ir–Ge/Al2O3 catalyst with the lowest Ge content (0.1 wt%) and directly reduced.

Graphical abstractPt–Ir/Al2O3 catalysts were modified by addition of germanium, in order to suppress the strong hydrogenolytic activity of this type of naphtha reforming catalyst. The trimetallic systems were prepared by a surface redox reaction. The objective of the study is to examine the influence of the Ge addition step and of the activation step of these systems on their catalytic properties.Selectivity to methane obtained in the reaction of isomerization of n-C5 at 240 min of time-on-stream for the Pt–Ir–Ge/Al2O3 catalysts activated by direct reduction (R) or by calcination–reduction (C-R).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Trimetallic reforming catalysts; Pt–Ir–Ge/Al2O3; Catalytic reduction method
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Influence of the pretreatment method on the properties of trimetallic Pt–Ir–Ge/Al2O3 prepared by catalytic reduction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 332, Issue 1, 1 November 2007, Pages 37–45
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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