Abstract
Carbon supported phosphoric acid (H3PO4/C) was found to be a more productive catalyst for the gas-phase synthesis of the diesel fuel additive/substitute oxymethylene ethers (OME) as compared to benchmark zeolite catalysts. In this contribution, the performance of catalysts H3PO4/C and related H2PO4−/C and HPO42−/C materials in OME synthesis from methanol and formaldehyde is described.Graphic
Highlights
Many efforts in research and politics are currently directed towards finding solutions for more sustainable mobility, as the transportation sector constitutes one of the main factors contributing to global greenhouse gas emission [1]
At long residence time the reaction reaches already equilibrium after a short bedlength, so that even at very high flow rates a substantial conversion level can be maintained. At such high flow rates, the granular support suffers from some mass transfer limitation: When the catalyst was ground to a fine powder prior to testing, the conversion was appreciably higher at the same residence time, and a comparable performance to the moderate WHSVFA recurred
In our previous study on gas-phase oxymethylene ethers (OME) synthesis from methanol and formaldehyde, we described the correlation between acid properties and catalyst activity for a range of zeolites
Summary
Many efforts in research and politics are currently directed towards finding solutions for more sustainable mobility, as the transportation sector constitutes one of the main factors contributing to global greenhouse gas emission [1]. While the mentioned characteristics suggest a low market introduction barrier for OME, its widespread use could to date not be established due to the remaining challenge to develop a cost- and energy-efficient production process. For this reason, the investigation of novel OME synthesis procedures is a highly interesting as well as relevant topic. Phosphoric acid supported on carbon was investigated as an alternative to zeolite catalysts for gas-phase OME synthesis. When phosphoric acid is supported on a porous carbon (H3PO4/C) and used without further treatment at elevated temperatures, no mixed phases or phosphorylation of the support is expected to occur This renders analysis, e.g. via 31P MAS NMR analysis, significantly more simple. Of H3PO4/C was compared to a benchmark zeolite catalyst
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