Zn-loaded HY zeolite as active catalyst for iso-propylation of biomass-derived phenolic compounds: A comparative study on the effect of acidity and porosity of zeolites

Afreen, Gul; Patra, Tanmoy; Upadhyayula, Sreedevi

doi:10.1016/j.mcat.2017.08.010

Cited by 23 publications

(25 citation statements)

References 52 publications

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“…Based on the above results, as to the NiZn‐HY hybrid catalysts, the weak acid sites were predominant and mainly contributed by the Lewis ones on HY, while the strong acid sites were mostly the Brönsted ones on HY as well as the Lewis ones due to unreduced Ni 2+ and ZnO/ZnAl 2 O 4 as well as Al 2 O 3 …”

Section: Resultsmentioning

confidence: 76%

“…In contrast to NiZnAl‐O, there are more hydroxyl groups on NiZnAl‐LDH . It is also well known that there are many hydroxyl groups on HY . During the calcination of NiZnAl‐LDH‐HY, the dehydroxylation could result in formation of metal–oxygen–metal bridge between NiZnAl‐LDH and HY.…”

Section: Resultsmentioning

confidence: 99%

“…The bands at 1441, 1450, 1573, 1610, 1613, 1616 and 1629 cm −1 are associated with pyridine adsorbed on Lewis acid sites, and the bands at 1541 and 1639 cm −1 are attributed to pyridine adsorbed on Brönsted acid sites. Additionally, the band at 1489 cm −1 can be due to pyridine adsorbed on both Brönsted and Lewis acid sites, and the band at 1593 cm −1 is assigned to hydrogen‐bonded pyridine . HY possessed both Lewis and Brönsted acid sites.…”

Section: Resultsmentioning

confidence: 99%

“…This is reasonable because the Brönsted acid sites on NiZn‐O‐HY and NiZn/HY are derived from HY zeolite. The following factors reduced the amount of Brönsted acid sites: (1) NiZnAl‐O and NiZnAl‐LDH could cover the acid sites on HY; (2) Al 2 O 3 , unreduced Ni 2+ and ZnO/ZnAl 2 O 4 contributed to Lewis acidity; and (3) during deposition–precipitation, the ion exchange process might also decrease the Brönsted acid sites on HY . Also, the deposition–coprecipitation process reduced more Brönsted acid sites than mortar mixing.…”

Section: Resultsmentioning

confidence: 99%

“…32 It is also well known that there are many hydroxyl groups on HY. [33][34][35] During the calcination of NiZnAl-LDH-HY, the dehydroxylation could result in formation of metal-oxygen-metal bridge between NiZnAl-LDH and HY. This could enhance the interaction between NiZnAl-LDH and HY and so promote Ni dispersion.…”

Section: H 2 Chemisorptionmentioning

confidence: 99%

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Catalytic deoxygenation of methyl laurate as a model compound to hydrocarbons on hybrid catalysts composed of Ni–Zn alloy and HY zeolite

Pan

Wang

Chen

2019

J of Chemical Tech & Biotech

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BACKGROUND The deoxygenation of renewable vegetable oils in a hydrogen atmosphere is feasible for yielding diesel‐like hydrocarbons. In this work, hybrid catalysts composed of Ni–Zn alloy and HY zeolite were designed to achieve a highly efficient deoxygenation. RESULTS NiZn‐LDH‐HY, NiZn‐O‐HY and NiZn/HY hybrid catalysts composed of Ni‐rich Ni–Zn alloy and HY zeolite were prepared by various methods. NiZn/HY prepared by a deposition–precipitation method gave higher Ni dispersion than NiZn‐LDH‐HY and NiZn‐O‐HY obtained by mortar milling. In the deoxygenation of methyl laurate as a model compound at 330 °C and 3.0 MPa, the hybrid catalysts led to higher reaction rates (ca 9.0 × 10−5 mol g−1Ni s−1) than NiZnAl not combined with HY (2.5 × 10−5 mol g−1Ni s−1). Particularly, NiZn/HY gave higher total selectivity to C11 and C12 hydrocarbons (80.2%) than NiZn‐O‐HY and NiZn‐LDH‐HY (47.4 and 41.5%, respectively). CONCLUSIONS This work provides an approach for preparing highly efficient catalysts for deoxygenation of esters to hydrocarbons by combining Ni–Zn alloy and HY zeolite. We deem that the closer proximity between metallic Ni and acid sites facilitates the deoxygenation via a synergetic effect between the two kinds of sites. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: H 2 Chemisorptionmentioning

confidence: 99%

See 3 more Smart Citations

Catalytic deoxygenation of methyl laurate as a model compound to hydrocarbons on hybrid catalysts composed of Ni–Zn alloy and HY zeolite

Pan

Wang

Chen

2019

J of Chemical Tech & Biotech

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Synthesis of (−)‐menthol: Industrial synthesis routes and recent development

Dylong

Hausoul

Palkovits

et al. 2022

Flavour & Fragrance J

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Abstract(−)‐Menthol is one of the most popular aroma compounds worldwide. While in the past mostly extracted from mint plants, today (−)‐menthol synthesis from other raw materials is becoming more relevant. Common starting materials for menthol synthesis are m‐cresol, citral and myrcene, but also substrates like menthone, mono‐ and bicyclic terpenes and terpenoids have been used for this purpose in the past. As for many applications (−)‐menthol of high purity is required, asymmetric syntheses and enantiomeric resolution of obtained raw products are applied for menthol production. This review gives an overview on the most important synthetic menthol production processes of the companies Symrise, Takasago and BASF and relevant literature in the field of menthol synthesis with a focus on the last 20 years.

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Synergistic Bronsted‐Lewis Acidity Effect on Upgrading Biomass‐Derived Phenolic Compounds: Statistical Optimization of Process Parameters, Kinetic Investigations and DFT Study

et al. 2018

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Biomass‐derived phenolic compounds and small oxygenates obtained from pyrolysis of lignocellulosic biomass needs to be upgraded to obtain the C10‐C13 range fuel precursors. In this context, iso‐propylation of m‐cresol was performed in batch reactors using multifunctional ionic liquids (ILs) as catalysts. Environmentally benign Bronsted‐Lewis acidic ILs were synthesized and characterized using 1H NMR, 13C NMR and Raman spectroscopic data. Relative Bronsted and Lewis acidity of these ILs were compared using UV‐Visible and FTIR spectroscopic data and the effect of acidity on the catalytic activity and product selectivity in alkylation of m‐cresol with iso‐propyl alcohol was investigated. Correlation of acidity and catalytic activity was confirmed by theoretical DFT study on IL structures. High conversion of m‐cresol (95.6%) was obtained using ZnCl2 containing IL, at 393 K temperature and 2:1:1 alcohol: m‐cresol: IL molar ratio, within 5 h of reaction time. The activity and recoverability of these ILs were retained even after 8 recycles. The effect of process parameters like reaction time, temperature, reactant mole ratio and catalyst to reactant mole ratio was investigated and optimized from design of experiments results. A plausible reaction mechanism was formulated based on the product distribution and a kinetic model was developed to estimate the activation energy (45.70 kJ mol−1) and pre‐exponential factor (247.78 lit. mol−1 min−1).

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Zn-loaded HY zeolite as active catalyst for iso-propylation of biomass-derived phenolic compounds: A comparative study on the effect of acidity and porosity of zeolites

Cited by 23 publications

References 52 publications

Catalytic deoxygenation of methyl laurate as a model compound to hydrocarbons on hybrid catalysts composed of Ni–Zn alloy and HY zeolite

Catalytic deoxygenation of methyl laurate as a model compound to hydrocarbons on hybrid catalysts composed of Ni–Zn alloy and HY zeolite

Synthesis of (−)‐menthol: Industrial synthesis routes and recent development

Synergistic Bronsted‐Lewis Acidity Effect on Upgrading Biomass‐Derived Phenolic Compounds: Statistical Optimization of Process Parameters, Kinetic Investigations and DFT Study

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