Catalytic conversion over dehydroxylated zeolite

US4790928A · kind A · utility

Assignee

• Mobil Oil Corporation · US

Inventors

• Clarence D. Chang · Princeton, US
• Nai Y. Chen · Titusville, US
• Stuart D. Hellring · Yardley, US
• Ying-Yen P. Tsao · Lahaska, US
• Dennis E. Walsh · Richboro, US

Key dates

• Filing date: Feb 8, 1988
• Grant date: Dec 13, 1988
• Expiry date: Feb 8, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2529/40
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The acidity of a zeolite catalyst is reduced by calcination in an essentially water-free atmosphere at temperatures above 700.degree. C., preferably from 725.degree. to 800.degree. C., to reduce the alpha value to less than about 10 percent of its original value. The low acidity catalysts produced in this way may be used for conversions requiring low acidity, shape selective catalysis, including dewaxing. The calcined, low acidity catalysts exhibit improved dewaxing activity.