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Publication Detail
Continuous syntheses of highly dispersed composite nanocatalysts via simultaneous co-precipitation in supercritical water
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Weng XL, Zhang JY, Wu ZB, Liu Y, Wang HQ, Darr JA
  • Publisher:
    ELSEVIER SCIENCE BV
  • Publication date:
    05/04/2011
  • Pagination:
    453, 461
  • Journal:
    APPL CATAL B-ENVIRON
  • Volume:
    103
  • Issue:
    3-4
  • Print ISSN:
    0926-3373
  • Language:
    EN
  • Keywords:
    Three-way catalysts, Co-precipitation, Supercritical water, Nano, Composite catalysts, OXYGEN STORAGE CAPACITY, CONTINUOUS HYDROTHERMAL SYNTHESIS, NEAR-CRITICAL WATER, ONE-STEP SYNTHESIS, SOLID-SOLUTIONS, 3-WAY CATALYSTS, MIXED OXIDES, THERMAL-STABILITY, PERFORMANCE, INTERFACE
  • Addresses:
    Wu, ZB
    Zhejiang Univ
    Dept Environm Engn
    Zhejiang Prov Engn Res Ctr Ind Boiler & Furnace F
    Hangzhou
    310027
    Zhejiang
    Peoples R China
Abstract
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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