Characterization and catalytic reactivity of mordenite – Investigation of selective oxidation of benzyl alcohol

Narayanan, S. Sriman; Vijaya, J. Judith; Sivasanker, S.; Alam, Mahboob; Tamizhdurai, P.; Kennedy, L. John

doi:10.1016/j.poly.2014.12.038

Cited by 31 publications

(15 citation statements)

References 30 publications

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“…Based on Figure 2, the diffraction pattern shows characteristic peaks at 2θ (°) angles of 9.78°; 13.56°; 19.70°; 22.51°; and 27.78°. This result is consistent with previous research in which some sharp characteristic peaks at 2θ of 9.82 °; 13.56 °; 19.69 °; 22.35 ° and 27.74 ° were reported [20,38]. Figure 2 shows that diffraction pattern of CoMo/MOR is almost similar to the initial MOR.…”

Section: Catalyst Propertiessupporting

confidence: 92%

“…Meanwhile, the peak at 1100 -1050 cm -1 are internal and external symmetric stretching of O-Si/Al-O-. While, the peak at 420-500 cm -1 corresponds to an internal and external asymmetric stretching (←O(Si/Al)→←O) of siliceous materials [38]. FTIR analysis of MOR and CoMo/MOR show similar characteristic peaks, however the transmittance shown by the peaks are different.…”

Section: Catalyst Propertiesmentioning

confidence: 97%

“…The broadband peak at a wavenumber around 3400 cm -1 is predicted to be a vibrational stretch from isolated groups (Si-O-H) and water molecules that are adsorbed on the surface of catalyst [38,49]. The presence of water bound to the surface is supported by an absorption band at 1640 cm -1 [38]. Meanwhile, the peak at 1100 -1050 cm -1 are internal and external symmetric stretching of O-Si/Al-O-.…”

Section: Catalyst Propertiesmentioning

confidence: 99%

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Synthesis And Characterization Of CoMo/Mordenite Catalyst For Hydrotreatment Of Lignin Compound Models

Nugrahaningtyas

Rahmawati

et al. 2019

Open Chemistry

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The synthesis of CoMo/Mordenite (CoMo/MOR) catalysts was conducted using a co-impregnation method at a various Co/Mo ratios. The produced catalysts were then characterized by X-ray diffraction, total acidity analysis, and scanning electron microscopy. The activity of the catalyst in a hydrotreatment reaction was evaluated by applying the catalyst as a reduced-catalyst to the hydrocracking (HC) reaction of anisole molecules. Analysis of the diffraction data using the Le Bail refinement technique showed that the metal phase was successfully impregnated into the MOR. In addition, increasing the metal content resulted in an increase in the acidity of the catalysts and changed the morphology of the catalysts from homogeneous to heterogeneous with larger particle size. According to the data of GCMS, it is known that the catalysts successfully removed methyl group of anisole molecules. Hydrotreatment reaction with the prepared-catalyst produced 4.77% of phenols. It is 122 % higher than the reaction with MOR catalyst.

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Section: Catalyst Propertiessupporting

confidence: 92%

Section: Catalyst Propertiesmentioning

confidence: 97%

Section: Catalyst Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis And Characterization Of CoMo/Mordenite Catalyst For Hydrotreatment Of Lignin Compound Models

Nugrahaningtyas

Rahmawati

et al. 2019

Open Chemistry

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“…The selective catalytic oxidation of benzyl alcohols to benzaldehyde is one of the most fundamental transformations both in the laboratory and in the industrial synthetic chemistry [1,2]. Benzaldehyde is an important intermediate and a high-value product in the cosmetic, food, dyestuff, pharmaceutical, and agrochemical industries [2,3,4]. The catalytic performance of supported monometallic and supported bimetallic catalysts such as Au, Pd, Ag, Au–Cu, Au–Pd, and Cu–Ni for the selective oxidation of benzyl alcohol has been extensively studied [4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Gold-Silver Nanoparticles Supported on Zeolitic Imidazolate Framework-8 as Highly Active Heterogenous Catalysts for Selective Oxidation of Benzyl Alcohol into Benzaldehyde

et al. 2018

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The metal-organic zeolite imidazolate framework-8 (ZIF-8) supported gold-silver bimetallic catalysts with a core-shell structure (Au@Ag/ZIF-8 and Ag@Au/ZIF-8) and cluster structure (AuAg/ZIF-8) were successfully prepared by the deposition-redispersion method. Energy dispersive X-ray spectroscopy (EDS) elemental mapping images displayed that in the Au@Ag/ZIF-8 catalyst, Ag atoms were deposited on an exposed Au surface, and core-shell structured Au@Ag particles with highly dispersed Ag as the shell were formed. Additionally, the XPS investigation at gold 4f levels and silver 3d levels indicated that the Au and Ag particles of Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were in a zero valence state. Among the resultant catalysts obtained in this study, Ag@Au/ZIF-8 catalysts showed the highest catalytic activity for the selective oxidation of benzyl alcohol, followed by AuAg/ZIF-8 and Au@Ag/ZIF-8. The turnover frequency (TOF) values were in the order of Ag@Au/ZIF-8 (28.2 h−1) > AuAg/ZIF-8 (25.0 h−1) > Au@Ag/ZIF-8 (20.0 h−1) at 130 °C within 1 h under 8 bar O2 when using THF as solvent. The catalysts of Au@Ag/ZIF-8 and Ag@Au/ZIF-8 with core–shell structures have higher benzaldehyde selectivities (53.0% and 53.3%) than the AuAg/ZIF-8 catalyst (35.2%) in the selective oxidation of benzyl alcohol into benzaldehyde. The effect of the solvent, reaction temperature, reaction time, and reaction pressure on benzyl alcohol conversion and benzaldehyde selectivity in benzyl alcohol selective oxidation over Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were also investigated. All of the catalysts showed excellent performance at 130 °C under 8 bar O2 within 1 h when using THF as the solvent in the selective oxidation of benzyl alcohol to benzaldehyde. Moreover, the catalysts can be easily recycled and used repetitively at least four times.

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“…It is very difficult to control the reaction because of over oxidations or side reactions under conventional severe reaction conditions [4,5]. Therefore, many protocols have been proposed for the catalytic transformation, including direct dehydrogenation [6][7][8] and oxidation in the presence of various oxidant, such as tert-butyl hydroperoxide (TBHP) [9,10], H 2 O 2 [11][12][13], NaIO 4 [14], meta-chloroperoxybenzoic acid (mCPBA) [15] and O 2 [16][17][18][19][20], et al…”

Section: Introductionmentioning

confidence: 99%

Effect of basicity on the catalytic properties of Ni-containing hydrotalcites in the aerobic oxidation of alcohol

Zhou

Tao

Pan

et al. 2016

Journal of Molecular Catalysis A: Chemical

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A series of Ni-containing hydrotalcites with different basicities have been prepared by introducing different Mg 2+ contents, and characterized by XRD, SEM, TG-DTG, ICP, FTIR, Hammett analysis, DR UV-Vis, XPS, et al. The effects of basicity on the catalytic performance in the selective aerobic oxidation of alcohols and the mechanism have been studied. The results showed that substituting Ni 2+ in the structure by Mg 2+ ions significantly increased the surface basicity of the catalysts. The surface basicity of Ni-containing hydrotalcites could accelerate the first acid-base reaction step in the oxidation and improve the catalytic activity. Varied alcohols were tested and discussed in the reaction system to verify the effect, and the results indicated that the activity of α-C-H bond is the key factor for the benzyl alcohol derivatives, while the first base-acid reaction step may be more important for aliphatic alcohols. The comparison results between the hydrotalcites and the calcined samples showed that the type of basic site have significantly influence on the catalytic activity, and only the Brønsted OH basic sites accelerate the oxidation. In addition, a probable mechanism for the reaction was postulated based on catalytic results, Hammett and a series of controlled experiments. The main factors affecting the catalytic oxidation of varied alcohols using molecular oxygen as the ultimate oxidant have been discussed, which may be helpful in designing more efficient catalyst.

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Characterization and catalytic reactivity of mordenite – Investigation of selective oxidation of benzyl alcohol

Cited by 31 publications

References 30 publications

Synthesis And Characterization Of CoMo/Mordenite Catalyst For Hydrotreatment Of Lignin Compound Models

Synthesis And Characterization Of CoMo/Mordenite Catalyst For Hydrotreatment Of Lignin Compound Models

Bimetallic Gold-Silver Nanoparticles Supported on Zeolitic Imidazolate Framework-8 as Highly Active Heterogenous Catalysts for Selective Oxidation of Benzyl Alcohol into Benzaldehyde

Effect of basicity on the catalytic properties of Ni-containing hydrotalcites in the aerobic oxidation of alcohol

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