The effect of sulfur on the water-gas-shift (WGS) activity of Pd/ceria catalysts has been studied using steadystate rate measurements, pulse-reactor studies, and FTIR. After exposing Pd/ceria to SO2 at 673 K in an oxidizing environment, the WGS rates dropped to a value close to that observed on Pd/alumina. Both pulsereactor and FTIR measurements showed that cerium sulfates can be readily reduce...

Using ambient pressure X-ray photoelectron spectroscopy (APXPS) and mass spectrometry (MS) while varying the temperature, we were able to directly understand how sequence of exposing reactant gases, CO2 H2, influenced surface species reverse water–gas shift reaction product formation on Ni(100). When first dosing at room temperature (RT), Ni(100) shows a significant amount oxide due spontaneous...

Iron-containing spinels, also known as ferrospinels, are widely used catalysts for the water gas shift (WGS) reaction. The catalytic activity of spinels containing transition metal ions as dopants or modifiers is influenced by the acid base and redox properties of these ions as well as by their site occupancy amongst the octahedral and tetrahedral sites in the spinel structure. It has been esta...

The role of Fe promoters has been investigated on Pd/ceria, Pt/ceria and Rh/ceria catalysts for the water-gas shift (WGS) reaction in 25 Torr of CO and H2O, under differential reaction conditions. While no enhancement was observed with Pt and Rh, the activity of Pd/ceria increased by as much as an order of magnitude upon the addition of an optimal amount of Fe. Similarly, the addition of 1 wt% ...

In this investigation, we report the preparation and characterization of Co-, Cuand Mn-substituted iron oxide catalytic materials supported on activated carbon. Co-precipitation method and low temperature treatment were used for their synthesis. The influence of chemical composition, stoichiometry, particle size and dispersity on their catalytic activity was studied. Samples were characterized ...

Hydrogen-etching technology was used to prepare TiO2−x nanoribbons with abundant stable surface oxygen vacancies. Compared with traditional Au-TiO2, gold supported on hydrogen-etched TiO2−x nanoribbons had been proven to be efficient and stable water–gas shift (WGS) catalysts. The disorder layer and abundant stable surface oxygen vacancies of hydrogen-etched TiO2−x nanoribbons lead to higher mi...