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To meet the gradual changes in petroleum demand, in particular a reduced demand for heavy fuel oil, advanced technology for resid hydroprocessing is now extremely necessary. The catalyst technology for resid hydroprocessing in Japan, especially fixed bed type of hydrodesulfurization and hydroconversion, is reviewed in this article.
In Japan, in late 1989, the Environmental Agency's Central Council for Environmental Pollution Control instituted an exhaust gas control program for diesel vehicles, setting forth the permissible emission levels. The program not only imposes a substantial curb on NO x emissions but also calls for the reduction of black soot exhaust gas, which is peculiar to diesel vehicles, and restricts...
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