Decarboxylation of p-Coumaric Acid during Pyrolysis on the Nanoceria Surface

Abstract

Temperature-programmed desorption mass spectrometry (TPD MS) was used to study the pyrolysis of p-coumaric acid (pCmA) on the nanoceria surface. The interaction of pCmA with the CeO2 surface was investigated by FT-IR spectroscopy. The obtained data indicated the formation on the nanoceria surface of bidentate carboxylate complexes with chelate (Δν = 62 cm−1) and bridge structure (Δν = 146 cm−1). The thermal decomposition of pCmA over nanoceria occurred in several stages, mainly by decarboxylation. The main decomposition product is 4-vinylphenol (m/z 120). The obtained data can be useful for studying the mechanisms of catalytic thermal transformations of lignin-containing raw materials using catalysts containing cerium oxide and the development of effective technologies for the isolation of pCmA from lignin.

Thermokinetics of production of biochar from crop residues: an overview

“…Sterically-controlled "concerted" mechanism for the ketonization reaction ( pathway "a", Fig. 3) over ceria-based catalysts was proposed on the grounds of this approach: 104 The kinetics of direct and catalytic pyrolysis of natural cinnamic acids (ferulic, caffeic, cinnamic, coumaric) 77,88,[108][109][110][111][112] on the surfaces of nanoscale oxides (silica, ceria, alumina) by the method TPD-MS was investigated. The products of pyrolytic reactions on the surface are identifiedthe corresponding vinylbenzenes, phenylacetylenes, and phenylketenes.…”

“…The kinetics of direct and catalytic pyrolysis of natural cinnamic acids (ferulic, caffeic, cinnamic, coumaric) 77,88,108–112 on the surfaces of nanoscale oxides (silica, ceria, alumina) by the method TPD-MS was investigated. The products of pyrolytic reactions on the surface are identified – the corresponding vinylbenzenes, phenylacetylenes, and phenylketenes.…”