fulltext.study @t Gmail

Preparation of well-dispersed Pt/SiO2 catalysts using low-temperature treatments

Paper ID Volume ID Publish Year Pages File Format Full-Text
43952 45997 2006 8 PDF Available
Title
Preparation of well-dispersed Pt/SiO2 catalysts using low-temperature treatments
Abstract

This work explores methods to prepare platinum on silica catalyst using temperatures as low as possible. Therefore, thermal stability in both oxidizing and reducing atmosphere of eight different precursors was studied with thermo-gravimetric analyses (TGA-MS). Based on these data, the precursors were tested to prepare silica supported catalysts, resulting in relationship between the thermal stability of the precursors, the procedures of impregnation, reduction and calcination with the final dispersion on silica. Platinum precursors decomposed more easily in reducing than in oxidizing environment, due to thermochemistry. Catalysts prepared by using ion-exchange and direct reduction in hydrogen resulted in highly dispersed platinum particles on silica. PtClx and PtOx species, when present during catalyst preparation, cause sintering of platinum at temperatures higher than 250 °C (PtClx) and 350 °C (PtOx), respectively. These species can be converted more easily in hydrogen than in air. PtCl4, H2PtCl6·6H2O and H2Pt(OH)6 are suitable as precursors for achieving high platinum dispersion, keeping temperatures below 150 °C.

Keywords
Pt/SiO2; Catalyst preparation; TGA; Platinum precursor; Sintering; Dispersion; Reduction; Calcination
First Page Preview
Preparation of well-dispersed Pt/SiO2 catalysts using low-temperature treatments
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 301, Issue 1, 10 February 2006, Pages 51–58
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us