fevereiro 2015 vol. 1 num. 2 - XX Congresso Brasileiro de Engenharia Química

Artigo - Open Access.

Idioma principal

CONVERSION OF ETHANOL TO OLEFINS OVER HZSM-5 CATALYSTS

SALBEGO, P. R. S.; CENTENARO, G. S. N. M.; KLAIC, R.; CANABARRO, N. I.; MULLER, T. K.; MAZUTTI, M. A.; FOLETTO, E. L.; JAHN, S. L.;

Artigo:

This work aims the synthesis and study of ZSM-5 catalysts for the conversion of ethanol to light olefins, especially, using an alternative and inexpensive route. The ethanol emerges as a renewable source for the production of olefins. The ZSM-5 catalyst has important characteristics for this type of reaction such as acidity, surface area and particle size. The synthesis was carried out in hydrothermal treatment at 170 °C. Were performed two synthesis with templates, using n-butylamine and tetrapropylammonium hydroxide (TPAOH), and an alternative and novel way using a nucleating gel. The catalyst characterization was performed using several techniques (XRD, BET, SEM and TGA). The catalytic reaction studied the influence of temperature (250 to 450 °C) and SAR (Si/Al2 ratio). The products analysis was made with a gas chromatograph. The ethylene yield was above to 80 % for all catalysts. Lower SAR values obtain higher yields for propylene, around to 8 %. The temperature, SAR and template influenced in the selectivity. The nucleating gel method showed to be a viable and inexpensive alternative for ZSM-5 synthesis. 1. INTRODUCTION Nowadays, light olefins are in a growing demand since are used as feedstock for several polymeric products, and its production is manly as a byproduct of naphtha steam cracking and catalytic cracking of crude oil (Meng et al. 2012; Ouyang et al. 2009). The environmental issue regarding this type of process have made several researchers to explore for alternative and sustainable routes for olefins production, and following this tendency, ethanol show as a potential candidate for feedstock, in the ethanol to olefins (ETO) reaction (Inaba et al. 2007; Lu and Liu 2011). The use of ZSM-5 zeolite as catalyst for conversion of ethanol to light olefins become an option because of its characteristics such as acidity, structure and shape-selective. The textural properties of ZSM-5 zeolite, especially its framework Si/Al, which is related to the acidity of the catalyst, played a vital role in determining the nature of the product. In the ZSM-5 synthesis, templates are used for more structural stability and this substances can be neutral or charged, organic or inorganic and are used to induce crystallization and assist to define the structure (Fouad et al. 2006; Sang et al. 2004). Área temática: Engenharia de Reações Químicas e Catálise 1With the importance of find new methods for ZSM-5 synthesis, some studies are trying routes without the aid of templates (Cheng et al. 2008; Kalipçilar et al. 2007), and one of the synthesis in this work use a small portion of template in a attempt to find a alternative and inexpensive route for the ZSM-5 synthesis and consequently to the ETO reaction. Thus, the aim of this work was study and evaluate HZSM-5 catalysts for the ETO reaction. For that reason, catalysts where synthesized in two traditional methods with the aid of templates with the purpose of comparing with an a third and novel way using a nucleating gel containing a small concentration of template (Lam et al. 2006), all with three different SAR (Si/Al2 ratio) values (30, 60 and 100). In addition to that was studied, in the catalyst activity, the influence of the reaction

Artigo:

Palavras-chave:

DOI: 10.5151/chemeng-cobeq2014-1826-17354-176546

Referências bibliográficas
  • [1] ARGAUER, R.J.; LANDOLT, G.R. Crystalline zeolite ZSM-5 and method of preparing the same. U.S. Pat. 3,702, 886, 1972.
  • [2] CHENG Y.; LIAO R.H.; LI J.S.; SUN X.Y.; WANG L.J. Synthesis research of nanosized ZSM-5 zeolites in the absence of organic template. J. Mater. Process. Technol., 206, 445-452, 2008.
  • [3] FOUAD O.A.; MOHAMED R.M.; HASSAN M.S.; IBRAHIM I.A. Effect of template type and template/silica mole ratio on the crystallinity of synthesized nanosized ZSM-5. Catal. Today., 116, 82–87, 2006.
  • [4] INABA M.; MURATA K.; SAITO M.; TAKAHARA I. Production of olefins from ethanol by Fe-supported zeolite catalysts. Green Chem., 9, 638-646, 2007.
  • [5] INOUE K.; INABA M.; TAKAHARA I.; MURATA K. Conversion of Ethanol to Propylene by H-ZSM-5 with Si/Al2Ratio of 280. Catal. Lett. 136:14-19, 2010.
  • [6] KALIPÇILAR H.; ÇULFAZ A. Template-Free Synthesis of ZSM-5 Type Zeolite Layers on Porous Alumina Disks. Turk. J. Chem., 31, 233-242, 2007.
  • [7] LAM, Y. L. Nucleating Gel, Process for its preparation, and its use in the synthesis of MFI-TYPE Zeolite. C01B 39/40, C01B 39/04. n° WO2006-087337, 2006.
  • [8] LU J.; LIU Y. Effects of P content in a P/HZSM-5 catalyst on the conversion of ethanol to hydrocarbons. J. Nat. Gas Chem., 20, 162-166, 2011.
  • [9] MENG T.; MAO D.; GUO Q.; LU G. The effect of crystal sizes of HZSM-5 zeolites in ethanol conversion to propylene. Catal. Commun., 21, 52-57, 2012.
  • [10] OUYANG J.; KONG F.; SU G.; HU Y.; SONG Q. Catalytic conversion of bio-ethanol to ethylene over La-modified HZSM-5 catalysts in a bioreactor. Catal Lett., v. 132, p. 64-74, 2009.
  • [11] RUBIN, M. K.; ROSINKI, E. J.; PLANCK, C. J. Synthezing Low Sodium Crystalline Alumino-silicate Zeolites with Primary Amines. U.S. Pat. 4, p.151-189, 1979.
  • [12] SANG S.; CHANG F.; LIU Z.; HE C.; HE Y.; XU L. Difference of ZSM-5 zeolites synthesized with various templates. Catal. Today., 93-95, 729–734, 2004.
Como citar:

SALBEGO, P. R. S.; CENTENARO, G. S. N. M.; KLAIC, R.; CANABARRO, N. I.; MULLER, T. K.; MAZUTTI, M. A.; FOLETTO, E. L.; JAHN, S. L.; "CONVERSION OF ETHANOL TO OLEFINS OVER HZSM-5 CATALYSTS", p. 10912-10919 . In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 2359-1757, DOI 10.5151/chemeng-cobeq2014-1826-17354-176546

últimos 30 dias | último ano | desde a publicação


downloads


visualizações


indexações