Sulfur Poisoning of Catalysts. Quarterly Progress Report,October 1--December 31, 1975.

摘要

The research concerns a study of the mode of interaction of gaseous sulfur compounds with commercial catalysts employed for the production of liquid fuels from carbon monoxide and hydrogen. The objective of the current phase of the project is the investigation of the kinetics of sulfur poisoning of methanol synthesis catalysts and the rate and mechanism of sulfur accumulation on the active surfaces of such catalysts. Sulfur-poisoning kinetics are being measured in a bench-scale apparatus that incorporates a Berty gradientless reactor. The methanol yield is evaluated as a function of temperature,space velocity,and total pressure for copper-zinc-aluminum-oxide catalysts. At present,sulfur is supplied to the catalyst in the form of hydrogen sulfide admixed in the reactor feedstock at concentrations up to 50ppm. Concurrent with these kinetic experiments,the catalysts surfaces are examined by Auger electron spectroscopy (AES). This analytical technique identifies the elemental constituents in the outermost atomic layers of the catalyst and permits characterization of surface composition during exposure to reactants and hydrogen sulfide. The bulk chemical states of the catalysts are determined by x-ray diffraction measurements. (ERA citation 01:012721)