Synthesis and modification of beta zeolite for use in toluene disproportionation reaction

<p>In this paper zeolite Beta was synthesized and characterized by XRD, ATG, ATD, XRF and SEM. Subsequently various modifications were made using a surface passivation process in liquid phase with tetraethylorthosilicate (TEOS), using two loads of TEOS and three passivation cycles, in order to obtain six catalysts. These materials were characterized by NH3-TPD and tested in tolune disproportionation reaction, under different conditions of pressure and temperature. As modification cycles were increased for each catalyst, there was a change in the acidity of the solids, mainly due to deposition of an inert layer of silica on the external surface. These results were confirmed with the improvement in para-selectivity and decreasing in conversion. Despite zeolite Beta is a large pore zeolite, an improvement of the para-selectivity was obtained, achieving almost stable values for the entire range of temperature and pressure conditions.</p>

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An Investigation into the Adsorption of Aniline from Aqueous Solution Using H-Beta Zeolites and Copper-Exchanged Beta Zeolites

Adsorption Science & Technology ◽

10.1260/0263617054353582 ◽

2005 ◽

Vol 23 (3) ◽

pp. 255-266 ◽

Cited By ~ 3

Author(s):

J. O'Brien ◽

T. Curtin ◽

T.F. O'Dwyer

Keyword(s):

Aqueous Solution ◽

Adsorption Process ◽

Zeolite Beta ◽

Langmuir Model ◽

Beta Zeolite ◽

Copper Leaching ◽

Beta Zeolites ◽

The Stability ◽

Ph Range ◽

Adsorbent Materials

Zeolite beta, a large-pore zeolite, was investigated in this study with a view to examining it as a potential adsorbent for the removal of aniline from aqueous solutions. Two different metal-loaded zeolites were prepared by exchanging H-beta zeolite (SiO2/Al2O3 = 75:1) with copper. The influence of exchanged copper on the uptake level was assessed. The effect of varying the silica-to-alumina ratio of the H-beta zeolite on the aniline uptake level was also examined, using three different H-beta zeolites with ratios of 25:1, 75:1 and 150:1 as adsorbents. The sorption experiments indicated an uptake level of ca. 110–120 mg/g for each zeolite and this level was also adsorbed by the copper-modified H-beta zeolites (SiO2/Al2O3 = 75:1). In all cases, the adsorption process followed the Langmuir model for adsorption and the level of aniline adsorbed was largely unaffected by a change in temperature or the presence of extra framework copper. The stability of the exchanged copper on these zeolites was then examined by measuring the quantity of copper leached from each zeolite into solution as a function of pH. Minimum copper leaching was observed in the pH range 5–11. This provided a stable pH working range for the adsorbent materials.

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Diffusion of non-volatile phenolic compounds in zeolite beta and silicalite in liquid phase

Adsorption ◽

10.1007/s10450-016-9808-7 ◽

2016 ◽

Vol 22 (7) ◽

pp. 1001-1011 ◽

Cited By ~ 3

Author(s):

Tran Ngoc Linh ◽

Hirotaka Fujita ◽

Akiyoshi Sakoda

Keyword(s):

Phenolic Compounds ◽

Liquid Phase ◽

Zeolite Beta

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Kinetics and optimization of the toluene disproportionation reaction over solid acid catalysts

Applied Catalysis ◽

10.1016/s0166-9834(00)80582-5 ◽

1987 ◽

Vol 33 (1) ◽

pp. 39-53 ◽

Cited By ~ 16

Author(s):

Jen-Ray Chang ◽

Fong-Chang Sheu ◽

Ying-Ming Cheng ◽

Jung-Chung Wu

Keyword(s):

Solid Acid ◽

Disproportionation Reaction ◽

Solid Acid Catalysts ◽

Acid Catalysts ◽

Toluene Disproportionation

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Catalytic properties of calcium-neodymium type Y zeolites in toluene disproportionation reaction

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science ◽

10.1007/bf00926300 ◽

1975 ◽

Vol 24 (1) ◽

pp. 98-103

Author(s):

Ya. I. Isakov ◽

Kh. M. Minachev ◽

N. Ya. Usachev

Keyword(s):

Catalytic Properties ◽

Disproportionation Reaction ◽

Y Zeolites ◽

Toluene Disproportionation

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Lewis acidic zeolite Beta catalyst for the Meerwein–Ponndorf–Verley reduction of furfural

Catalysis Science & Technology ◽

10.1039/c5cy01501d ◽

2016 ◽

Vol 6 (9) ◽

pp. 3018-3026 ◽

Cited By ~ 74

Author(s):

Maura Koehle ◽

Raul F. Lobo

Keyword(s):

Continuous Flow ◽

Zeolite Beta ◽

Beta Zeolite ◽

Flow Conditions

Tin-, zirconium- and hafnium-containing siliceous Beta zeolite were investigated in the Meerwein–Ponndorf–Verley reduction of furfural under continuous flow conditions.

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Selective etherification of β-citronellene catalyzed by zeolite beta

Green Chemistry ◽

10.1039/c5gc00361j ◽

2015 ◽

Vol 17 (5) ◽

pp. 2840-2845 ◽

Cited By ~ 3

Author(s):

Sambhu Radhakrishnan ◽

Martin Purino ◽

Konstantinos Alexopoulos ◽

Francis Taulelle ◽

Marie-Françoise Reyniers ◽

...

Keyword(s):

Liquid Phase ◽

Continuous Flow ◽

Zeolite Beta ◽

Catalytic Process ◽

Heterogeneous Catalytic Process ◽

Heterogeneous Catalytic

A continuous flow, liquid phase, heterogeneous catalytic process for chemoselective etherification of β-citronellene monoterpene using the zeolite beta catalyst.

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