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Indexed by:期刊论文

Date of Publication:2014-11-01

Journal:JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

Included Journals:SCIE、EI、Scopus

Volume:393

Page Number:182-190

ISSN No.:1381-1169

Key Words:CuHAP; Cu location; Active sites; HCHO oxidation; Preparation method

Abstract:Different methods including ion exchange, co-precipitation and impregnation were used for the preparation of copper doped hydroxyapatite catalysts (CuHAP) to adjust the location of Cu on HAP and resulted in the difference of catalytic performance. Adjustments of synthesis conditions (ion exchange) were adopted for the further identification of active Cu sites for formaldehyde oxidation over CuHAP catalysts. Methods of characterization including XRD, H-2-TPR, EPR and XPS were used for the identification of Cu species and its environment on the HAP. A hypothesis of five possible sites for Cu location was proposed based on the features of HAP structure and the experimental results. It has also been concluded that the highly-dispersed Cu(II) clusters was mainly responsible for HCHO oxidation. The best activity was achieved over CuHAP (1.4 wt.%) prepared by the ion exchange method with the complete conversion temperature of 180 degrees C. (C) 2014 Elsevier B.V. All rights reserved.