Dehydration of 1,5‐Pentanediol over Na‐Doped CeO<sub>2</sub> Catalysts

Gnanamani, Muthu Kumaran; Jacobs, Gary; Martinelli, Michela; Shafer, Wilson D.; Hopps, Shelley D.; Thomas, Gerald A.; Davis, Burtron H.

doi:10.1002/cctc.201701420

Cited by 9 publications

(12 citation statements)

References 40 publications

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“…It is known that dehydration is preferred over cyclization on metal oxides at higher reaction temperature. Unlike CeO 2 , ZrO 2 produced selectively 4‐peten‐1‐ol and THP derivatives from 1,5‐pentanediol. This could be due to the difference in acidic and basic sites with these catalysts.…”

Section: Resultsmentioning

confidence: 99%

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Dehydration of 1,5‐Pentanediol over ZrO₂‐ZnO Mixed Oxides

et al. 2019

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Zn addition was found to affect both activity and selectivity of ZrO 2 for dehydration of 1,5-pentanediol. ZrO 2 tends to produce more or less equimolar mixture of tetrahydropyran (THP) derivatives and 4-penten-1-ol from 1,5-pentanediol. The conversion of 1,5-pentanediol on ZrO 2 increases with increasing Zn content up to 30-50 mole percent; however, catalyst containing Zn beyond 50 mole percent had an adverse effect on both conversion of diol and the selectivity for unsaturated alcohol (i. e., 4-penten-1-ol). XRD and Raman analysis infer that the presence of tetragonal ZrO 2, the amorphous phase (ZrO 2 , ZrZnO x , ZnO), and hexagonal wurtzite structure of ZnO in the catalysts. The interplanar spacing of ZrO 2 (111) and ZnO (100) planes for catalysts indicate that Zn incorporates into ZrO 2 lattice and vice-versa. Basicity assessed from CO 2 -TPD and acidity from FTIR-pyridine adsorption techniques indicate that both basicity and Lewis acid sites density increases with increasing Zn proportion on ZrO 2 up to 50:50 molar ratios of Zn to Zr. An optimum Zn:Zr mole ratio is required to achieve higher density of oxygen vacant metal sites (i. e., Lewis acidity) and balanced acid-base strength which improves the diol conversion.

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Section: Resultsmentioning

confidence: 99%

“…In our recent study, we found that Na additions have shifted the product selectivity of CeO 2 toward unsaturated alcohol at the expense of decreased conversion of 1,5‐pentanediol. We proposed that Na could inhibit the generation of “O” vacancy sites on CeO 2 so that only a few more sites are available for diols adsorption.…”

Section: Introductionmentioning

confidence: 94%

Dehydration of 1,5‐Pentanediol over ZrO₂‐ZnO Mixed Oxides

et al. 2019

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“…Combustion temperature of pure oxide samples was achieved in the region of 445-560 • C. The acidification of cerium precursor at the stage of catalyst preparation improved the catalytic performance of the obtained materials. The sample prepared by precipitation method using HNO 3 /Ce(NO 3 ) 3 = 2 had the highest catalytic activity with T m = 465 • C. It is noteworthy that the use of large amounts of alkali metals at the stage of synthesis may significantly influence on the morphology and defective structure of cerium oxide, which will impact on the observed catalytic activity [91].…”

Section: Soot Oxidationmentioning

confidence: 98%

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

et al. 2018

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Nowadays catalytic technologies are widely used to purify indoor and outdoor air from harmful compounds. Recently, Ag-CeO 2 composites have found various applications in catalysis due to distinctive physical-chemical properties and relatively low costs as compared to those based on other noble metals. Currently, metal-support interaction is considered the key factor that determines high catalytic performance of silver-ceria composites. Despite thorough investigations, several questions remain debating. Among such issues, there are (1) morphology and size effects of both Ag and CeO 2 particles, including their defective structure, (2) chemical and charge state of silver, (3) charge transfer between silver and ceria, (4) role of oxygen vacancies, (5) reducibility of support and the catalyst on the basis thereof. In this review, we consider recent advances and trends on the role of silver-ceria interactions in catalytic performance of Ag/CeO 2 composites in low-temperature CO oxidation, soot oxidation, and volatile organic compounds (VOCs) abatement. Promising photoand electrocatalytic applications of Ag/CeO 2 composites are also discussed.Au [17][18][19][20][21][22][23], Ru [24,25], Rh [26][27][28][29], and Cu [30,31] were proposed. Metal oxide-based catalysts (Co 3 O 4 [32], MnO x [33], etc.) also attracted wide interest. However, a significant part of the developed catalysts has limited use under real conditions due to high costs of noble metals (the loading of palladium, platinum, gold is of 2-10 wt. %), relatively low stability to "hard" conditions of oxidation processes causing the loss of active component and reduction of the catalyst activity and selectivity. Therefore, the development of high-performance affordable and stable catalysts for low-temperature total oxidation of harmful compounds is still challenging. Efficiency and costs of such catalysts are connected with proper selection of the type of active component, support, and preparation method [34].Recently, supported silver catalysts have brought about wide interest due to their high activity in low-temperature oxidation processes. Different supports are studied (SiO 2 , CeO 2 , MnO x , TiO 2 , Al 2 O 3 , ZrO 2 , etc.) [35][36][37][38]. It is shown that an enhanced catalytic activity of Ag-based catalysts can be achieved by using reducible metal oxides as supports and by controlling the metal-support interaction to provide synergistic effect between active sites of the support and noble metal [39].Among the supports mentioned, CeO 2 brings about high interest, since it combines exceptional redox and acid-base properties with oxygen storage, which can be controlled by proper preparation methods and treatments. Moreover, these distinctive properties of ceria cause its wide applications as a support for catalysts. For this reason, highly active and relatively inexpensive Ag/CeO 2 composite is considered promising heterogeneous catalyst for total oxidation of harmful organic compounds, including formaldehyde [40], , soot [44][45][46][47][48][49]. The Ag...

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“…In this perspective, vapor phase is a continuous flow process, which generates value-added products with better yields at atmospheric pressure will be an attractive proposition. For vapor phase reactions, numerous solid oxide catalysts such as, bixbyite Sc 2 -xYbxO 3 catalysts [6], ZrO 2 and Yb 2 O 3 [7], CeO 2 doped with Na [8], rare earth oxide [9, 10], MgO-modified ZrO 2 [11] were systematically utilized for synthesis of unsaturated alcohols, and THP from 1,5-pentanediol. Gnanamani et al., reported the use of Ga 2 O 3 doped on CeO 2 basic solid oxide support, as catalyst for production of mono alcohols and un saturated alcohols from 1,5-pentanediols, with improved yields [12].…”

Section: Introductionmentioning

confidence: 99%

Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst

Madduluri

Katari

Peddinti

et al. 2019

Heliyon

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Activated red brick (ARB) clay material proved superb catalyst for selective conversion of 1,5-pentanediol (1,5-PDO) to tetrahydropyran (THP) and 1,6-hexanediol (1,6-HDO) to oxepane (OP) via dehydration under vapor phase conditions in a continuous flow reactor. As per scanning electron microscopy (SEM), SEM-EDX and X-ray fluorescence (XRF) techniques, ARB clay catalyst majorly possessed silica (quartz), and iron oxide (hematite) species, and synergistic texture contributed to the catalytic efficiency for prolonged time-on-stream (TOS). The combination of active Lewis and Bronsted acidic sites with weak to mild acidic nature in the ARB clay obviously facilitates the dehydration reaction with high selectivity, tetrahydropyran (82%) and oxepane (89%). ARB clay displayed superior catalytic properties in the dehydration of alcohols compared with activities of commercial silica and α-Fe 2 O 3 as catalysts. Commercial silica and α-Fe 2 O 3 catalysts possessing the Lewis acidic sites only did not facilitate synchronous dehydration mechanism.

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Dehydration of 1,5‐Pentanediol over Na‐Doped CeO₂ Catalysts

Cited by 9 publications

References 40 publications

Dehydration of 1,5‐Pentanediol over ZrO₂‐ZnO Mixed Oxides

Dehydration of 1,5‐Pentanediol over ZrO₂‐ZnO Mixed Oxides

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst

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Dehydration of 1,5‐Pentanediol over Na‐Doped CeO2 Catalysts

Cited by 9 publications

References 40 publications

Dehydration of 1,5‐Pentanediol over ZrO2‐ZnO Mixed Oxides

Dehydration of 1,5‐Pentanediol over ZrO2‐ZnO Mixed Oxides

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst

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Product

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Dehydration of 1,5‐Pentanediol over Na‐Doped CeO₂ Catalysts

Dehydration of 1,5‐Pentanediol over ZrO₂‐ZnO Mixed Oxides

Dehydration of 1,5‐Pentanediol over ZrO₂‐ZnO Mixed Oxides