Goshima T., Nishida Y., Mizuta K., Nii S. . Effects of Particle Size Distribution of Low-Density Particles on Gas-Solid Behavior in Fluidized Beds . Chemical Engineering and Technology2022 · 記述言語： 日本語 出版者・発行元： Chemical Engineering and Technology Three hollow borosilicate glass particles 7040S-R, 7040S-F1, and 7040S-F2 with different particle size distributions were prepared. The size of fluidized particles of 7040S-F2 was similar with that of the primary particles such as fluid catalytic cracking (FCC), while the bed height was more than twice the static bed height. The small bubbles were uniformly dispersed in the bed, and the high magnitude of the particle velocity different from that of the FCC was observed. The Geldart A particle 7040S-F2 could help solve the unavoidable problems with superfine particles 5070S, leading to poor fluidization through repeated and/or long-term operations. 7040S-F2 would serve as guidance for designing new particles to provide the favorable fluidization expected from catalytic fluidized-bed reactors with high contact efficiency. DOI： 10.1002/ceat.202200355 Scopus
Nii S., Ueda H., Aono M., Mizuta K., Goshima T. . Facile preparation of graphene nitride by irradiating MHz ultrasound . Ultrasonics Sonochemistry90 1061792022 · 記述言語： 日本語 出版者・発行元： Ultrasonics Sonochemistry The present study aimed at developing a simple sonochemical method to prepare graphene nitride from the mixture of graphite and aqueous ammonia solution. Ultrasound of 1.6 MHz was irradiated to the sample in a fabricated sonoreactor at predetermined ultrasonic power and duration. The one-pot method succeeded in the preparation of graphene nitride. The generation was proven by XPS analysis in finding N1S peak in the spectrum. Detail analysis of N1s peak suggested that the major nitrogen species was pyrrolic type. Furthermore, the presence of CO bond proved the oxidation by OH radical. The reaction product had the value of N/C as high as 0.08, which is comparable to reported values for ultrasonic preparation of graphene nitride. The fact indicates that the significance of chemical effects of MHz range ultrasound, and the finding of the simple preparation method will accelerate practical application of graphene nitride. DOI： 10.1016/j.ultsonch.2022.106179 Scopus PubMed
