Co 对 WO3-Co3O4预还原的影响及其产物碳化性能

Translated title of the contribution: Effect of Co on the pre-reduction process of WO3-Co3O4 and carbonization performance of its product

Huijun Shang, Hengli Li, Jiayi Liu, Feng Pan, Zhan Du, Linbing Sun

Research output: Contribution to journalArticlepeer-review

Abstract

In order to avoid the formation of η phase (Co6W6C or Co3W3C) that adversely affect the sintering process and its products in the preparation process ultra-fine WC-Co powder, we propose a technical route of pre-reduction of WO3-Co3O4 to WO2-Co and then deep reduction carbonization to WC-Co. The influence of Co content and cobalt source particle size on the pre-reduction process of WO3-Co3O4 was investigated at 600℃ H2-C2H4-Ar atmosphere in a fluidized-bed reactor, and the deep reduction and carbonization properties of the pre-reduced products were tested. The results show that the presence of Co can catalyze the splitting of C2H4to separate H2and C, significantly accelerate the pre-reduction rate of WO3, and the pre-reduction rate increases significantly with the increase of Co content. The carbon evolution rate and carbon evolution amount of ethylene also increase with the increase of Co content. Cobalt source particle size has a significant effect on the pre-reduction rate of WO3 and carbon evolution rate of C2H4. In this experimental system, the carbon evolution rate of C2H4 in nano cobalt source system is about twice that of micron cobalt source system. Meanwhile, WO3 in nano cobalt source system also has faster reduction rate. The pre-reduced product was calcined with methane partial pressure of 1.25% at 950℃ for 60 min, and fine WC-Co composite powder without η could be obtained.

Translated title of the contributionEffect of Co on the pre-reduction process of WO3-Co3O4 and carbonization performance of its product
Original languageChinese (Traditional)
Pages (from-to)5592-5604
Number of pages13
JournalHuagong Xuebao/CIESC Journal
Volume73
Issue number12
DOIs
StatePublished - 5 Dec 2022

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