Low-Temperature Catalysts for Selective Oxidation of Hydrogen Sulfide to Sulfur

EPA Contract Number: 68D50076
Title: Low-Temperature Catalysts for Selective Oxidation of Hydrogen Sulfide to Sulfur
Investigators: Srinivas, Girish
Small Business: TDA Research Inc.
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1995 through March 1, 1996
Project Amount: $65,000
RFA: Small Business Innovation Research (SBIR) - Phase I (1996) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


Natural gas provided 30% of the energy consumed in the U.S. in 1992. Unfortunately, almost 25% of the U.S. gas reserves are contaminated with H2S. Due to its acidic nature and corrosivity, the H2S content of gas entering pipelines must be lower than 4 ppm.

In a typical large gas plant, the H2S is stripped out of the natural gas by an aqueous amine solution. Upon regeneration, the amine solution produces a concentrated stream of H2S. Traditionally, small amounts of H2S has been incinerated to SO2 prior to venting, or, treated in Claus plants to recover the sulfur. Since the Claus reaction is limited by equilibrium, it is expensive to operate the Claus process at high conversions or small scales.

TDA Research proposes to develop a catalytic process for partial oxidation of H2S to sulfur. In Phase I, the activity and selectivity of the catalysts will be investigated as a function of temperature, catalyst composition, and reactant concentration. They will also carry out engineering analyses to compare these novel catalyst systems with current tail gas treatment technology, as well as identify the potential for use in related applications.

Supplemental Keywords:

Scientific Discipline, Air, air toxics, Environmental Chemistry, Engineering, Chemistry, & Physics, Environmental Engineering, emission control strategies, catalyzing oxidation, air pollutants, oxidation reactions, oxidation, catalytic oxidation, Claus plants, catalyst composition, characterization of catalysts, novel catalyst systems, hydrogen sulfide oxidation, air pollution, catalysts, emissions, ambient emissions, sulfur, gas-phase oxidation, gas plant, gas treatment, Hydrogen sulfide, aqueous amine, H2S oxidation, engineering models

Progress and Final Reports:

  • Final