Flash Pyrolysis of Oleic Acid as a Model Compound Adsorbed on Supported Nickel Catalysts for Biofuel Production

Abstract

A pirólise rápida do ácido oleico foi estudada sobre catalisadores com 10% Ni suportados em sílica e alumina. Os catalisadores foram impregnados com 10% m/m de ácido oleico. Os precursores secos e os catalisadores contendo ácido oleico foram caracterizados por análise termogravimétrica. Os catalisadores calcinados foram analisados por difração de raios X (XRD) e redução à temperatura programada (TPR). As amostras com ácido oleico adsorvido foram submetidos à pirólise rápida a 650 °C. A pirólise de ácido oleico puro levou a 10% de conversão, enquanto a pirólise catalítica resultou em praticamente completa conversão. O catalisador NiO/alumina produziu mais hidrocarbonetos do que o NiO/sílica. Os principais produtos obtidos com NiO/sílica foram 1-alcenos, enquanto que os principais produtos obtidos com NiO/alumina foram isômeros de alcenos e aromáticos, e pequenas quantidades de compostos oxigenados, principalmente álcoois. A pirólise rápida de ácido oleico adsorvido em catalisadoras representa um método útil para distinguir as propriedades dos catalisadores e suas diferentes atividades.Flash pyrolysis of oleic acid was studied over 10 wt.% nickel catalysts supported on silica and alumina. The catalysts were impregnated with 10 wt.% oleic acid. The dried precursors and the catalysts containing oleic acid were characterized by thermogravimetric analysis. The calcined catalysts were analyzed by X-ray diffraction (XRD) and temperature programmed reduction (TPR). Samples containing adsorbed oleic acid were submitted to flash pyrolysis up to 650 °C. Whereas pyrolysis of oleic acid without catalyst converted only about 10%, the pyrolysis of oleic acid adsorbed on catalysts allowed practically a complete conversion. NiO/alumina yielded a higher amount of liquid hydrocarbons than NiO/silica. The main products obtained with NiO/silica were 1-alkenes, whereas the main products obtained with NiO/alumina were alkene isomers and aromatics. Small amounts of oxygenated compounds were also observed, principally alcohols. The flash pyrolysis of oleic acid adsorbed on different catalyst surfaces appears as a useful way to distinguish activity trends of different catalyst samples.

Nannochloropsis algae pyrolysis with ceria-based catalysts for production of high-quality bio-oils

“…In the presence of NiCe/Al 2 O 3 catalyst, volatiles released from pyrolysis are subjected to various reactions including deoxygenation by decarboxylation, which results in the production of hydrocarbons (see Section 3.5). Similar results were obtained performing the flash pyrolysis of oleic acid over 10 wt% nickel catalysts supported on silica and alumina (Fréty et al, 2014). NiO/alumina yielded a higher amount of liquid hydrocarbons than NiO/silica.…”

Analytical Pyrolysis of the Fungal Melanins from Ochroconis spp. Isolated from Lascaux Cave, France

“…Using Pyroprobe, Faure et al [55] pyrolyzed undecanoic acid at 620 • C and obtained C 6 -C 10 alkenes, C 8 -C 10 fatty acids, C 10 -C 11 alkanals, C 11 fatty acid methyl ester, and C 11 γ-lactone. Pyrolysis at 650 • C of oleic acid in the same pyrolytic unit yielded fatty acids with shorter C chain (C 7 -C 16 ) and alkenes, aldehydes, alcohols, and ethers were also identified [56]. In addition, the lactones identified in the pyrolyzates of the melanins must have their origin in the major fatty acids C 16 and C 18 [57].…”

Mo influence on the kinetics of jatropha oil cracking over Mo/HZSM-5 catalysts

“…In all experiments, the use of a catalyst:oil mass ratio of 5:1 was to study the influence of initial properties of the catalyst on the conversion of biomass with minimum influence of the pure thermal reactions, as described in the literature [11,16,32].…”

“…Fast cracking of jatropha oil, either pure or adsorbed on supported molybdenum HZSM-5-based catalysts, was carried out in a Pyroprobe CDS 5000 micro-pyrolyser coupled to a Shimadzu QP 2010 Plus gas chromatograph which was connected to a mass spectrometer, as described in the literature [32]. About 1.0 mg of catalyst with 0.2 mg of impregnated JO was inserted in a quartz tube between quartz wool plugs.…”