OP-II-3

OP-I-18According to GLC the main products are camphene, limonene, p-cymene andtricyclene (Fig. 1). The selectivity towards camphene (60-80 %) and α-pineneconversion (99.9 %) over Au/γ-Al 2 O 3 catalyst were exceptionally high.The general kinetic regularities of the vapour-phase α-pinene isomerization overAu/γ-Al 2 O 3 catalyst were established. The effect of temperature (Fig. 2), residencetime and initial α-pinene concentration on the α-pinene conversion and thecamphene selectivity was studied. The catalyst deactivation during reaction wasstudied by TEM, temperature-programmed oxidation (TPO) and FT-IR spectroscopy.It was found that predominant coke formation and insignificant amount of oligomerson the catalyst surface causes the catalyst deactivation. It was shown that thecatalyst activity can be regenerated completely by the oxygen treatment directly inthe same reactor where the process occurs (Fig. 3).2.0100T=483K80initial Au/Al 2O 3Ln(k)473463conversion, %604020deactivation of Au/Al 2O 3Au/Al 2O 3after regeneration1.02.0 2.1 2.21/Т*10 3Figure 2. The Arrhenius plot of the rateconstant. The reaction conditions:T=463-483 K, α-pinene concentration20.0 vol. %, residence time 0.05-0.45 s.00 100 200 300 400 500time, minFigure 3. Catalyst regeneration. Reactionconditions: residence time 0.33 s, T=473 K,α-pinene concentration 0.4 vol.% (●,■) and4.0 vol. % (♦).To conclude the original method of selective camphene synthesis from renewableα-pinene over 2.2 wt. % Au/γ-Al 2 O 3 was developed.References[1]. K.A.D. Swift, Topics Catal., 2005, v. 27,p. 143.[2]. I. Simakova, Yu. Solkina, I. Deliy, J. Wärnå, D. Yu. Murzin, Appl. Catal. A, 2009, v.356, p. 216.[3]. I.V. Deliy, I.L. Simakova, Russian Chemical Bulletin, 2008, v. 57, # 10, p. 2021.[4]. V.A. Semikolenov, I.I. Ilyna, I.L. Simakova, Appl. Catal. A, 2001, v. 211, # 1, p. 91.[5]. I.L. Simakova, V.A. Semikolenov, Chemistry for sustainable development, 2003, v. 11, # 1, p. 271.[6]. M. Haruta, Catal. Today, 1997, v. 36, p. 153.[7]. B.L. Moroz, P.A. Pyrjaev, V.I. Zaikovskii, V.I. Bukhtiyarov, Catal. Today, 2009, v. 144, p. 292.AcknowledgementsThe research work was supported by RFBR Grant № 08-03-91758-АF (Russia), RFBR Grant№ 10-03-01005-а and partly by UNAM project PUNTA (Mexico) and PAPIIT IN224510.71