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Continuous syntheses of highly dispersed composite nanocatalysts via simultaneous co-precipitation in supercritical water

Paper ID Volume ID Publish Year Pages File Format Full-Text
46871 46451 2011 9 PDF Available
Title
Continuous syntheses of highly dispersed composite nanocatalysts via simultaneous co-precipitation in supercritical water
Abstract

Nanosized Ce0.6Zr0.3La0.05Y0.05O2−δ/γ-Al2O3(CZA) composite supports were prepared in one step using a novel continuous hydrothermal flow synthesis (CHFS) route and a conventional co-precipitation route, followed by 10 h heat-treatments at 1000 °C in air (to simulate accelerated ageing). HAADF STEM and HR-TEM results indicated that the sample made via CHFS route (i.e., simultaneous co-precipitation in supercritical water, denoted as sc-CZA) had homogenously dispersed CZ particles on alumina support whilst that made via conventional co-precipitation route (denoted as co-CZA sample) had a strong segregation between CZ and alumina. As a consequence of these structural and morphological properties, better sintering behaviors upon accelerated ageing and lesser grain growth of CZ particles were obtained. The sc-CZA sample was then used as supports for syntheses of three-way catalysts (TWCs), in which Pd active species were added via either directly co-precipitating (in the CHFS reactor) or simply wet impregnating Pd2+ onto the support to form composite nanocatalysts. Catalytic measurements revealed that the former had yielded a significantly higher three-way catalytic activity than the latter, attributing to its much higher dispersion of Pd species and stronger interaction between Pd and CZA support.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Homogenous co-precipitation in supercritical water yielded highly dispersed products. ► Much better sintering behaviors for the CHFS made products were obtained. ► The CHFS route yielded very high dispersion and interaction of active species. ► The CHFS made three-way catalysts (TWCs) had excellent catalytic activities.

Keywords
CHFS, continuous hydrothermal flow synthesis; sc, sample was synthesized via CHFS route; co, sample was synthesized via conventional co-precipitation route; wi, sample was synthesized via wet impregnation route; CZ, Ce0.6Zr0.3La0.05Y0.05O2−δ; CZA, Ce0.6Zr
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Continuous syntheses of highly dispersed composite nanocatalysts via simultaneous co-precipitation in supercritical water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 103, Issues 3–4, 5 April 2011, Pages 453–461
Authors
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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