Hydrocarbon oxidation and aldol condensation over basic zeolite catalysts

Li, Junhui; Tai, Jianren; Davis, Robert J.

doi:10.1016/j.cattod.2006.01.032

Cited by 39 publications

(35 citation statements)

References 25 publications

(50 reference statements)

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“…23 This is also the case of Cs oxide impregnated CsX zeolite, reported to be a very basic material. 24 …”

Section: Alkali and Alkali Earth Cationic Zeolites And Their Industrimentioning

confidence: 97%

“…The effectiveness of these solids for the base catalyzed aldol condensation of propionic acid with formaldehyde to methacrylic acid was directly correlated to the expected basic strength of the alkali-exchanged zeolites (NaX < KX < CsX). 54 The impregnated "overexchanged" catalyst 12% Cs/CsX exhibited even higher activity. However, these zeolite materials were found less active than Bi-promoted Cs/SiO 2 catalysts.…”

Section: Alkali and Alkaline Earth Zeolites As Catalystsmentioning

confidence: 97%

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Zeolites and Other Structurally Microporous Solids as Acid–Base Materials

Busca¹

2014

Heterogeneous Catalytic Materials

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“…23 This is also the case of Cs oxide impregnated CsX zeolite, reported to be a very basic material. 24 …”

Section: Alkali and Alkali Earth Cationic Zeolites And Their Industrimentioning

confidence: 97%

Section: Alkali and Alkaline Earth Zeolites As Catalystsmentioning

confidence: 97%

Zeolites and Other Structurally Microporous Solids as Acid–Base Materials

Busca¹

2014

Heterogeneous Catalytic Materials

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“…In other words, the catalysts modified by ZSM-5(38) with the strongest acidity exhibited the highest selectivity of acetone as a by-product. Li J. et al [23] suggested the formation mechanism of 3-pentanone during the aldol condensation of propionic acid and formaldehyde as shown in Scheme 3. Two propionic acid molecules reacted to form 3-pentanone by self-condensation.…”

Section: Effect Of Hcho-meoac Molarmentioning

confidence: 99%

Influence of Support Properties on the Activity of Basic Catalysts for Aldol Condensation of Formaldehyde and Methyl Acetate in a Continuous Flow Reactor

et al. 2015

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The aldol condensation of methyl acetate with formaldehyde to form methyl acrylate was studied in a continuous-flow reactor using a series of supported cesium basic catalysts with commercially available materials (ZSM-5, SiO 2 , and γ-Al 2 O 3 ) as carriers prepared by vacuum impregnation. The catalysts were characterized by N 2 adsorption-desorption, Fourier transform-infrared (FT-IR), X-ray diffraction (XRD), and temperature-programmed desorption of ammonia and carbon dioxide (NH 3 /CO 2 -TPD). The obtained results indicated that the selectivity of methyl acrylate was mainly influenced by the properties of supports. The formation of acetone is approximately proportional to the acidity of supports. The basicity of the catalysts was favorable to the formation of methyl acrylate according to the results of CO 2 -TPD. The hydrolysis of methyl acetate was inhibited over Cs-HT-SiO 2 prepared by SiO 2 after hydrothermal treatment. Furthermore, SiO 2 with the large mesoporous volume is superior to other supports, which shows the best catalytic activity for the aldol condensation reaction. On the other hand, the catalytic performance of zeolite basic catalysts was strongly influenced by the effect of reactant diffusion. Internal diffusion resulted in the increase of conversion of methyl acetate with increasing specific surface area, while the conversion of methyl acetate decreased with increasing the weight hourly space velocity (WHSV) due to the external diffusion.

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“…Ion-exchange properties of zeolite X are mainly referred to its use for removal of heavy metal ions [3,4] and radioactive ions [5,6] from waste solutions, but also for improvement of its absorption [7] and catalytic abilities [8][9][10]. Because of large pore diameter (0.74 nm) zeolite X is an excellent absorbent for different gasses such as hydrogen [7], carbon oxide, methane [11], oxygen, argon and nitrogen [11,12] and vapours such as water, hydrocarbons and benzene [13].…”

Section: Introductionmentioning

confidence: 99%