Abstract
Microreactor technology with high heat transfer in combination with stable catalysts is a very attractive approach for reactions involving major heat effects such as methane steam reforming and to some extent, also the high temperature water gas shift (WGS) reaction. For this study Rh/ceria catalysts and an ultrathin hydrogen selective membrane were characterized in situ in a microreactor specially designed for x-ray absorption spectroscopic measurements under WGS conditions. The results of these experiments can serve as a basis for further development of the catalysts and membranes.
Highlights
The worldwide growing demand for energy, increasing levels of harmful emissions and limited stocks of fossil fuels have led to increased efforts in the search for environmentally clean, sustainable and renewable energy sources and to a growing interest in efficient hydrogen production
The channels were coated with 720 mg of the catalyst mixed with 1 mol/L NaOH and dried overnight
X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS, ca. 25 min/scan) spectra at the Rh K-edge (23220 eV) along the central reactor channel were recorded at the Swiss Norwegian Beamline (SNBL) at the European Synchrotron Radiation Facility (ESRF) in transmission mode using a Si(111) double crystal monochromator
Summary
The worldwide growing demand for energy, increasing levels of harmful emissions and limited stocks of fossil fuels have led to increased efforts in the search for environmentally clean, sustainable and renewable energy sources and to a growing interest in efficient hydrogen production. One for the catalytic bed and reactant gas flow and the other one for the produced H2, are separated by a commercial hydrogen selective PdAg alloyed membrane. Heating cartridges in the reactor shell and gas connections allow XAS measurements at the Rh and Pd K-edge under reaction conditions.
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