Depositing different carbon species on MoP to enhance its activity for isoprene production in different ways
2020
To
study the effects of aromatic and olefinic carbon on isoprene
synthesis, different carbon sources were used to prepare a variety
of carbon deposited MoP catalysts for the condensation of isobutene
with formaldehyde, and fresh MoP was employed as comparison. The deposited
carbon with different carbonaceous species significantly enhanced
the activity of MoP for isoprene synthesis. TGA, XPS, XRD, 13C and 31P MAS NMR, TPD of ammonia, isobutene and isoprene,
and GCMS coupled with solid-phase microextraction were conducted to
study the carbon deposited catalysts. The nature of carbon and its
effect on the reaction were described. It was suggested that the deposited
carbon can change the microenvironment of MoP. More importantly, olefinic
and aromatic carbon may play different roles in improving the activity.
Especially, aromatic carbon could be in favor of the desorption of
isoprene from the catalyst surface and give an excellent selectivity.
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