454632 K2o/WOx/Al2O3 Catalyst Interactions with the Components and Byproducts of Sour Natural Gas

Wednesday, November 16, 2016: 10:36 AM
Franciscan C (Hilton San Francisco Union Square)
Jih-Mirn Jehng, Lehigh University, Bethlehem, PA, Israel E. Wachs, Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA, Zili Wu, Chemical Sciences Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN and Jonas Baltrusaitis, Chemical Engineering, Lehigh University, Bethlehem, PA, Lehigh University, Bethlehem, PA

Both CO2 and H2S acid gases are present in significant concentrations in natural “sour” gas streams and need to be separated using energy intensive amine absorption methods. The captured CO2 is emitted into the atmosphere acting as a major greenhouse gas while H2S is combusted to yield elemental sulfur and water. A recent development proposed focuses on catalytic transformation of CO2 and H2S under reducing environments on K2O-WO3/Al2O3 catalyst to form a reactive methyl mercaptan (CH3SH) intermediate that can be further converted to value-added hydrocarbons (alkanes, olefins and aromatics) and H2S thus performing solventless separation and valorization of CO2. The major problem and emphasis of this presentation is on the first reactive step. A fundamental knowledge base of acid gases - CO2 and H2S as well as they major reaction byproduct SO2 - induced K2O-WO3/Al2O3 catalyst structural changes and the corresponding reactive intermediates and gas phase product distribution are being investigated. In particular, prediction and control of the CO2 and H2S molecular interactions, the relevant catalyst structural changes and surface chemistry are examined with in situ Raman, IR spectroscopy and TPSR to assess the performance of this catalyst to facilitate discovery of novel catalytic materials that can function in the presence of acid gases for CH3SH synthesis.

Extended Abstract: File Not Uploaded
See more of this Session: Catalysis for C1 Chemistry I: CO2 Conversion
See more of this Group/Topical: Catalysis and Reaction Engineering Division