Abstract
Motivated by possible future applications in low pressure drop reactors for hydrogen production by fixed bed chemical looping steam reforming (CLSR), novel high porosity fibrous mats of aluminosilicate fibres have been investigated as a substrate for Ni/Co oxygen carriers (OC’s). When compared to granules of a conventional 18 wt% NiO steam reforming catalyst tested over seven redox cycles of CLSR, the fibrous OCs produced by homogeneous chemical precipitation routes increased the average methane conversion by up to 10% and hydrogen yield by up to 5%. All of the OC’s could be reduced by a CH4∕H2O mixture and produced no solid carbon during reforming.
Highlights
Scientific consensus on the dangers of anthropogenic climate change has become near irrefutable in recent years, prompting a drive to reduce greenhouse gas emissions from a number of industries
The results demonstrate a significant difference in Physical characteristics of the oxygen carriers (OC’s) used in the study
This mixture was placed in a beaker covered with a watch glass and placed in an oven; the temperature was raised from room-temperature at 10 ◦C min−1 to 95 ◦C for a dwell time of 24 h under an air atmosphere
Summary
Scientific consensus on the dangers of anthropogenic climate change has become near irrefutable in recent years, prompting a drive to reduce greenhouse gas emissions from a number of industries. Nickel when supported on alumina (Ni/α-Al2O3 or Ni/γ -Al2O3) is by far the most widely researched OC for syngas and H2 production This is thanks to strong catalytic activity for the SR reactions, acceptable oxygen transfer capacity and high redox reaction rates at the temperatures encountered in CLSR (Adanez et al, 2012; Tang et al, 2015; Noorman et al, 2007; Quddus et al, 2013; Zafar et al, 2005, 2006; Noorman et al, 2010; de Diego et al, 2008). The synthesis method used to produce an alumina supported OC must achieve close control of the distribution of the deposited metal oxide and minimize chemical reactions that degrade the catalytic activity (Dueso et al, 2012; Gayán et al, 2009, 2008; Mattisson et al, 2006). New small and medium scale hydrogen production processes could be realized in future, catering to distributed feedstocks such as unconventional gases (e.g. shale wells) and biomass products (e.g. large farms, anaerobic digestion plants, biorefineries)
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