Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 103, Issue 3-4, Pages 453-461Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2011.02.009
Keywords
Three-way catalysts; Co-precipitation; Supercritical water; Nano; Composite catalysts
Funding
- Changjiang Scholar Incentive Programme (2009)
- Ministry of Education, PR China
- Zhejiang Higher Education Scientific Research Program [Y200909610]
- EPSRC [EP/E040551/1]
- China Postdoctoral Science Foundation [20100471738]
- EPSRC [EP/E040551/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E040551/1] Funding Source: researchfish
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Nanosized Ce0.6Zr0.3La0.05Y0.05O2-delta/gamma-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 degrees 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. (c) 2011 Elsevier B.V. All rights reserved.
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