Studies on Diarylmethanes (Part 9)

Abstract

Summary:In order to clarify the active species of MoO3-Al2O3 catalyst for hydrocracking of diarylmethane, the effects of MoO3 content and calcination temperature on catalytic activity were studied. Moreover, changes in the hydrocracking behavior of diarylmethane over pretreated catalysts with water and aqueous ammonia were investigated.The catalytic activity increased with increasing MoO3 content, calcination temperature, and reduction time. Molybdenum oxide, which is extractable with aqueous ammonia but not extractable with water, was favorable for hydrocracking reaction.These results were well correlated with Giordano's study1). It was suggested that the main active species for hydrocracking were weak acidic sites formed by the reduction of octahedral Mo (VI) interacting with .Al2O3.

Relationship between microstructure and degree of hardening of air-dried maji-soils under different pH conditions

“…Twenty fields of vision were observed for each sample. Two microscopic photographs, one with a single nicol and the other with crossed nicols, were taken for each field of vision in order to distinguish voids from hand, Kawai (1971) divided the fabric of volcanic ash soils into seven types, and identified the "cemented porous fabric" in which skeleton grains were interconnected by plasma coating and a large amount of voids were observed, as the characteristic of indurated pan layer such as "Masa" around Mt. Fuji.…”

“…Kubotera and Yamada (1997, 1998, 2000 showed that indurated volcanic soils and clayey soils that become very hard by air-drying display a vughy microstructure with a small amount of voids whereas the microstructure of the soils that did not show a remarkable hardening was more porous, including microstructure such as crumb microstructure, granular microstructure, and spongy microstructure. On the other hand, Kawai ( 1971) divided the fabric of volcanic ash soils into seven types, and identified the "cemented porous fabric" in which skeleton grains were interconnected by plasma coating and a large amount of voids were observed, as the characteristic of indurated pan layer such as "Masa" around Mt. Fuji.…”