Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Full papers
Facile synthesis of MgO-modified mesoporous silica and its application to a CoMo-based ammonia decomposition catalyst
Takuya EHIROKazuaki KATAGIRIShimpei YAMAGUCHIYayoi YOSHIOKA
Author information
JOURNALS FREE ACCESS

2020 Volume 128 Issue 2 Pages 84-91

Details
Abstract

MgO-modified mesoporous silicas (MgO/SBA-15) were prepared in a one-pot synthesis method. In the present study, a silica precursor was rapidly hydrolyzed and condensed together with a Mg source under mild conditions without a hydrothermal treatment. It was confirmed that N2 adsorption–desorption isotherms of the prepared MgO/SBA-15s were classified as type IV, which is characteristic of SBA-15. The X-ray diffraction (XRD) patterns at low diffraction angle also indicated that MgO/SBA-15s retained the ordered mesoporous structure of SBA-15, in spite of a high Mg content. On the other hand, no diffraction peaks due to Mg species were confirmed in the XRD patterns at high diffraction angle, suggesting that Mg species were dispersed on mesopores. After MgO/SBA-15s were impregnated with Co and Mo, the obtained CoMo/MgO/SBA-15 catalysts were tested for ammonia decomposition. It was revealed that the MgO content greatly influenced the catalytic activities of the CoMo-based catalysts. Although a small or large additive amount of MgO decreased the catalytic activity of CoMo/SBA-15, the modification of SBA-15 with 15 wt % of MgO resulted in the highest catalytic performance for ammonia decomposition. Moreover, the present one-pot synthesis method was more favorable for the enhancement of the catalytic activity, compared with the conventional impregnation method.

Information related to the author
© 2020 The Ceramic Society of Japan
Previous article Next article
feedback
Top