Abstract
Iron-based catalysts have recognized as the promising candidates for syngas conversion to value-added products. Sodium and sulfur are widely used to refrain the product distribution towards lower olefins. Herein, the synergetic effect between Na and S were investigated by modulating χ-Fe5C2 with Na and/or S. With the characterization of XRD, Raman spectra, FESEM, TEM, TPD, XPS and semi-quantification calculations, we have revealed that when Na and S are added simultaneously, Na tends to activate the deactivated iron sites by S through electron transfer while the formation of long-chain products were weakened. We also demonstrated that sequential loading Na and S would not result in such synergetic effect because of the overlarge intimacy between both elements. This work emphasizes the significance of the synergetic effect of muti-promotors in such a kind of heterogenous catalysis.
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