catalytic dehydration of ethanol to ethylene

J. Soc. 2009, 65, 153. Jin, L. J.; Zhou, X. J.; Hu, H. Q.; Ma, B.; Catal. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Zhan, N. N.; Hu, Y.; Li, H.; Yu, D. H.; Han, Y. W.; Huang, H.; Catal. [ Links ], 36.

272, 92 (2015), T. Kamsuwan, B. Jongsomjit, Eng. Multidisciplinary Digital Publishing Institute (MDPI).

Global ethylene capacity continues to advance in 2011. It is clear that both XEtOH and SE drop to 93% after reacting 170 h for the parent HZSM-5. Inst. However, little work has been carried out to investigate the catalytic performance of alkali-treated HZSM-5 zeolites on ethanol dehydration to ethylene. 100%) for many catalysts between 200 and 400 °C. 125 0 obj <>stream

Chem. 2013 Oct;29(10):1431-40. The increase of the reaction temperature favors the main reaction of the dehydration of ethanol to ethylene and improves the catalysts activity. NLM M. Dekker; New York, NY, USA: 1980. About 100 mg of samples was pretreated at 500 ºC in Ar flow (40 mL min–1) for 1 h, and then cooled to 40 ºC. Immediate online access to all issues from 2019. lyst11). The authors thank the Grant for International Research Integration: Chula Research Scholar, Ratchadaphiseksomphot Endowment Fund for financial support of this project. At 200–300 °C, the unmodified catalysts tended to exhibit the higher catalytic activity than the boron-modified catalysts.

The high acid density apparently results in high catalytic activity, especially for the equally mixed γ- and χ- phase alumina (G50C50). Jacobs, J. M.; Jacobs, P. A.; Uytterhoeven, J.
Google Scholar, A. Zaherian, M. Kazemeini, M. Aghaziarati, S. Alamolhoda, J. Porous Mater. Kondarides, Appl.

The reaction products were analyzed using a gas chromatograph (GC-9560, Shanghai Haixin GC) using a GDX-103 packed column, N2 as carrier gas and flame ionization detector (FID) detector at oven temperature of 120 ºC.

Meanwhile, the regenerated catalyst exhibits good catalytic performances. In the 30's and 40's, several ethanol dehydration units were built which remained in operation until the 60's. eCollection 2020 May 5. 1990, 58, 119. Author information Keywords: ethanol dehydration, XPS analysis, solvothermal method, mixed phase alumina. Chem. The number of strong acid sites can be reduced and new mesopores can be created on the HZSM-5 catalyst during the alkali treatment process. The most promising were found to be a nanoscale catalyst HZSM-5 with 99.7% ethylene selectivity at 240 °C and 630 h lifespan, using a microreactor technology with mechanical vapor recompression, and algae-produced ethanol to make ethylene.

Gayubo, A. G.; Alonso, A.; Valle, B.; Aguayo, A. T.; Bilbao, J.; Appl. We use cookies to help provide and enhance our service and tailor content and ads. Production: Growth is the Norm.
Homer, A.; Perkins, P. P.; J. Lett. True W.R.

HZSM-5 zeolite has been treated with steaming, acid-leaching and modified by doping with metals, resulting in modified acidic properties, formation of mesopores and lower deactivation of the catalyst.10-12 However, a rather limited mesoporosity development can be obtained by these methods.13-16 Meanwhile, a higher reaction temperature is needed for these methods.13-16 Recently, alkali-treated zeolites with NaOH have been studied widely as a relatively new strategy for creating mesopores without destroying the micropores.17-20 The formed mesopores in alkali-treated HZSM-5 are more beneficial to the diffusion of reactants or products during the reaction and the modified HZSM-5 catalysts present higher catalytic activities in some reactions.21-24 This has been proved in the literature; for example, Jin et al.22 observed that mesopores in alkali-treated HZSM-5 resulted in higher catalytic activities and longer lifetime for selectivity synthesis of 2,6-dimethylnaphthalene.

To further study the stability of the regenerated AT0.4, the stability test of 350 h was also conducted and it still showed good catalytic performance. The catalytic performances of modified HZSM-5 catalysts for ethanol dehydration to ethylene were examined with emphasis on the activity, stability and regenerability of the catalysts. Part of Springer Nature., Janlamool J(1), Jongsomjit B(1). After filtration, washing and drying, the alkali-treated samples were ion-exchanged into the H-form by three consecutive exchanges in 0.1 mol L–1 NH4NO3 solution, and calcined at 550 ºC for 5 h. The alkali-treated HZSM-5 samples were marked as ATx (where x denotes the NaOH concentration). This may result from the occurrence of dealumination during the desilication of zeolite.27 Additionally, according to the report of Li,28 the dissolved Si in NaOH solution may deposit on the surface of HZSM-5 as amorphous Si species (backward reaction).

Main uses of ethylene in industry (left to right): polyethylene, ethylene dichloride (precursor to vinyl chloride, below), ethylene oxide (precursor to ethylene glycol, below), and ethylbenzene (precursor to styrene, below). endstream endobj 106 0 obj <> endobj 107 0 obj <> endobj 108 0 obj <>stream The decrease in acid density of the samples is mainly ascribed to the decrease of the strong acid sites presented at 300-500 ºC in Figure 3.

25, 1365 (2014), CAS  This process is an endothermic reaction requiring high temperature of 600–1000 °C. N2 adsorption-desorption isotherms were recorded on a Micromeritics Tristar-3000 instrument at liquid nitrogen temperature of –196 ºC. In brief, both the moderate number of strong acid sites and the newly created mesoropores of AT0.4 lead to the improvement of catalytic stability and coke-tolerance ability. Eng. O catalisador HZSM-5 tratado com 0.4 mol L–1 NaOH apresentou alta atividade e boa estabilidade. [ Links ], 5. Among them, AT0.4 with higher mesopores volume and external surface area exhibits the highest ethanol conversion and selectivity to ethylene at 265 ºC. Ogura, M.; Shinomiya, S. Y.; Tateno, J.; Appl. The newly created mesopores favor the molecular diffusion and accommodate part of coke deposition, consequently suppressing the formation of coke in the inherent micropores to some extent. ethanol dehydration than microscale HZSM-5 zeolite cata-. Maciel, J. Mol. 20, 151 (2013), O.

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