Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 393, Issue -, Pages 182-190Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2014.06.008
Keywords
CuHAP; Cu location; Active sites; HCHO oxidation; Preparation method
Categories
Funding
- National Natural Science Foundation of China [21377016]
- Fundamental Research Funds for the Central Universities [DUT13LK27]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_13R05]
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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.
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