Selective Production of Acetic Acid via Catalytic Fast Pyrolysis of Hexoses over Potassium Salts

Abstract

Glucose and fructose are widely available and renewable resources. They were used to prepare acetic acid (AA) under the catalysis of potassium acetate (KAc) by thermogravimetric analysis (TGA) and pyrolysis coupled with gas chromatography and mass spectrometry (Py-GC/MS). The TGA result showed that the KAc addition lowered the glucose’s thermal decomposition temperatures (about 30 °C for initial decomposition temperature and 40 °C for maximum mass loss rate temperature), implying its promotion of glucose’s decomposition. The Py-GC/MS tests illustrated that the KAc addition significantly altered the composition and distribution of hexose pyrolysis products. The maximum yield of AA was 52.1% for the in situ catalytic pyrolysis of glucose/KAc (1:0.25 wt/wt) mixtures at 350 °C for 30 s. Under the same conditions, the AA yield obtained from fructose was 48% and it increased with the increasing amount of KAc. When the ratio reached to 1:1, the yield was 53.6%. In comparison, a study of in situ and on-line catalytic methods showed that KAc can not only catalyze the primary cracking of glucose, but also catalyze the cracking of a secondary pyrolysis stream. KAc plays roles in both physical heat transfer and chemical catalysis.

Carbon Double Coated Fe3O4@C@C Nanoparticles: Morphology Features, Magnetic Properties, Dye Adsorption

“…It can be assumed that under the technological conditions used—heating at a constant not very high temperature over a rather long period of time—glucose forms structures serving as a kind of framework. Glucose decomposition at heating was shown in [ 24 ] to start at 188 °C and reach maximum rate at 220 °C ( Table 1 in Ref. [ 24 ]).…”

“…Glucose decomposition at heating was shown in [ 24 ] to start at 188 °C and reach maximum rate at 220 °C ( Table 1 in Ref. [ 24 ]). Moreover, this process can make some contribution to the curves shown in Figure 5 .…”

Increasing the energy density of high‐moisture wastes of beverage industry by hydrothermal pretreatment: Comparison of thermochemical conversion behaviors

“…The presence of furans in pyrolysis products is associated with the carbohydrate in the feedstock. Kang and Zhang 100 showed that the pyrolysis product of pure glucose contains furans (most furfural and then 5‐HMF) by weight. The pyrolysis products of both FS and HTCFS contained furans (2‐methyl furan, 2,5‐dimethylfuran, and furfural).…”

Initial Properties Identification of Refined- and Semi Refined-Carrageenans as Raw Materials for Biodegradable Plastic Production

“…These contaminations might have interfered the thermal decompositions of the carrageenan molecules. Some impurity elements were degraded earlier or close to the carrageenan decomposition temperature, such as glucose (Kang & Zhang, 2020;Quan, Gao, & Song, 2016). Meanwhile, others were decomposed at a higher temperature such as xylose, cellulose, and inorganic materials (ICF, 2011;Quan et al, 2016).…”