Hydrogenation Performance of Acetophenone to 1-Phenylethanol on Highly Active Nano Cu/SiO2 Catalyst

Wang, Bing; Jin, Manman; An, Hao; Guo, Zhaobing; Lv, Zhiguo

doi:10.1007/s10562-019-02908-2

Cited by 15 publications

(15 citation statements)

References 30 publications

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“…Previous studies have shown that the exchanged Cu 2+ ion in CHA cages can be reduced at different temperatures. For example, the Z 1 Cu(II)OH species is reduced to Cu + between 205 and 220 °C, the Z 2 Cu(II) is reduced to Cu + between 300 and 350 °C, [11–12] and the non‐exchanged Cu species (CuO x ) is reduced to Cu(0) below 200 °C [24] . Because of the stability of exchanged copper species in CHA, exchanged Cu + is not reduced to Cu(0) until a temperature >450 °C [12a] .…”

Section: Resultsmentioning

confidence: 99%

“…For example, the Z 1 Cu(II)OH species is reduced to Cu + between 205 and 220 °C, the Z 2 Cu(II) is reduced to Cu + between 300 and 350 °C, [11][12] and the non-exchanged Cu species (CuO x ) is reduced to Cu(0) below 200 °C. [24] Because of the stability of exchanged copper species in CHA, exchanged Cu + is not reduced to Cu(0) until a temperature > 450 °C. [12a] Thus, we used a H 2 pretreatment at 400 °C to ensure that all the exchanged Cu species were reduced to Cu + ions in order to establish the calibration curve for Cu + species from NO-IR.…”

Section: Quantitative Analysis Of Cu Species By No-irmentioning

confidence: 99%

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Quantification of Exchanged Copper Species in Cu‐Chabazite Zeolite using Cryogenic Probe Infrared Spectroscopy

et al. 2022

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The development of a low temperature (À 160 °C) NO adsorption technique is disclosed that avoids the chemical conversion of the probe molecule at room temperature. The observed IR peaks for Cu + (NO) 2 and Cu 2 + (NO) species can be used to quantify the amount of exchanged copper species in a broad range of samples, including a wash-coated honeycomb. Calibration curves for Cu + (NO) 2 and Cu 2 + (NO) are determined for copper loadings up to 3.99 wt% with Silica-to-Alumina Ratio (SAR) of 16-22, and quantitative agreement with the complementary hydrogen Temperature Programmed Reduction (H 2 -TPR) results is established. This methodology allows to identify different Cu species in Cu-CHA, such as Z 2 Cu(II), Z 1 Cu(II)OH and Cu dimers, based on their distinct IR signatures. In addition, the perturbed TÀ OÀ T framework vibration -characterized at 400 °C -can also be used as a complimentary method to quantify Z 2 Cu(II) species.

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Section: Resultsmentioning

confidence: 99%

Section: Quantitative Analysis Of Cu Species By No-irmentioning

confidence: 99%

Quantification of Exchanged Copper Species in Cu‐Chabazite Zeolite using Cryogenic Probe Infrared Spectroscopy

et al. 2022

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“…When the reaction was carried out for 1 h, the AP conversion rate and 1-PhE selectivity were 82.7 and 98.2%, respectively; when the reaction time was extended to 2 h, they were 89.4 and 93.2%, respectively. strong adsorption effect on AP and can increase the reactivity of the acyl group by polarizing the O atom in the carbonyl group (CO), 21,34 the H species that diffuses to the Cu + site can more rapidly and efficiently react with AP. In addition, the Cu + /Cu 0 site has almost no adsorption effect on 1-PhE, 35 which makes the generated 1-PhE rapidly detach and it does not occupy the active site.…”

Section: Resultsmentioning

confidence: 99%

“…Among the non-precious-metal catalysts, Cu-based catalysts have high selectivity for carbonyl hydrogenation and can effectively improve the selectivity for 1-PhE. Wang et al 21 prepared a nano-Cu/SiO 2 catalyst for AP hydrogenation to 1-PhE using H 2 as the hydrogen source. Under the optimal conditions, AP conversion and the 1-PhE selectivity reached 99.8 and 99.1%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Efficient Catalytic Transfer Hydrogenation of Acetophenone to 1-Phenylethanol over Cu–Zn–Al Catalysts

Pei

Wang

Lv³

et al. 2022

Ind. Eng. Chem. Res.

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Cu−Zn−Al catalyst was prepared by the co-precipitation method, and the catalytic performance for transfer hydrogenation of acetophenone (AP) to 1-phenylethanol (1-PhE) was evaluated using isopropanol (IPA) as a hydrogen source. The addition of Zn changed the morphology of the catalyst and reduced aggregation of catalyst particles, resulting in highly dispersed Cu active sites. As the Zn content increased, the valence state of Cu species changed. When the Cu/Zn molar ratio was 2/3, the Cu + /Cu 0 ratio in the catalyst was 0.81, resulting in good selectivity for 1-PhE. The reaction conditions were optimized over the Cu−Zn−Al catalyst with a Cu/Zn molar ratio of 2/3. When the reaction was performed at 180 °C for 2 h with an IPA/AP molar ratio of 15, the AP conversion was 89.4% and the 1-PhE selectivity was 93.2%. The Cu−Zn−Al catalyst showed good stability, and AP conversion and the 1-PhE selectivity were essentially unchanged after five cycles.

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“…Considering the selective hydrogenation of AP to PHE in liquid-phase hydrogenation, various pressures, temperatures, and types of solvents have been employed over supported noble metal and non-noble metal catalysts [5]. Noble metal catalysts that have been used are Pt [6][7][8][9][10], Ag [11], Pd [10,12,13], Rh [12,14], Ru [15] and non-noble metals such as Cu [2,4,5], Ni [5,16], Co [1,3,5], Zr [17], Fe [8,18], Cr [18]. Pt-supported catalysts are used in the hydrogenation of AP because of high catalytic activity but Pt-supported catalysts can catalyze hydrogenation of carbonyl (C=O) and phenyl groups of the AP molecule to produce comparable products of PHE and CHMK respectively.…”

Section: Introductionmentioning

confidence: 99%

Selective hydrogenation of acetophenone to 1-phenylethanol on Pt/ TiO2 catalysts prepared by pulsed dc magnetron sputtering

Ditsataporncharoen¹

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1-Phenylethanol (PHE) is a high-value chemical with various applications in fragrance and pharmaceutical industries. It is extensively used as strawberry fragrance additives in yogurts and chewing gums and an intermediate of anti-inflammatory drugs such as Ibuprofen. In this study, selective hydrogenation of acetophenone (AP) to PHE was investigated using platinum catalysts supported on different types of titanium dioxide including PC500 (pure anatase) and P25 (anatase mixed rutile). Pt was deposited on the titanium dioxide supports by pulsed direct current magnetron sputtering (PDC-MSD) method with deposition time spent on Pt coating at 3, 6, and 9 minutes. For comparison purposes, Pt/TiO2 catalysts were also prepared by incipient wetness impregnation method with similar Pt loadings (%). The characteristics and catalyst properties were analyzed by XRD, N2-physisorption, XPS, ICP-OES, TEM, CO-chemisorption, and H2-TPR. Hydrogenation of AP was carried out in a batch reactor at the pressure of 1 bar H2 and the temperature of 80oC for 2 hours using 2-propanol as the solvent. It was found that increasing sputtering time resulted in a larger average Pt particle size deposited on the TiO2 surface and increased amount of Pt loading (%). For any sputtering time used, platinum catalysts on PC500 TiO2 support provided higher selectivity of PHE than on P25 because of higher atomic ratio of Pt/Ti on the catalyst surfaces and higher Pt dispersion (%) on the PC500 TiO2 surface. However, increasing Pt loading (%) may also catalyze the hydrogenolysis of PHE to ethylbenzene (EB), resulting in lower PHE product. Moreover, at the reaction temperature of 80 oC could promote the hydrogenation of AP to PHE and inhibit hydrogenolysis of PHE to EB in 2-propanol solvent.

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Hydrogenation Performance of Acetophenone to 1-Phenylethanol on Highly Active Nano Cu/SiO2 Catalyst

Cited by 15 publications

References 30 publications

Quantification of Exchanged Copper Species in Cu‐Chabazite Zeolite using Cryogenic Probe Infrared Spectroscopy

Quantification of Exchanged Copper Species in Cu‐Chabazite Zeolite using Cryogenic Probe Infrared Spectroscopy

Efficient Catalytic Transfer Hydrogenation of Acetophenone to 1-Phenylethanol over Cu–Zn–Al Catalysts

Selective hydrogenation of acetophenone to 1-phenylethanol on Pt/ TiO2 catalysts prepared by pulsed dc magnetron sputtering

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