1
|
Campisi S, Gervasini A, Prati L, Zhang X, Liang K, Naguib M, Villa A. Two-dimensional MXenes as catalytic “flying carpets” to transport biomass valorization towards new horizons: The case of furfural catalytic transfer hydrogenation over noble-metal free niobium-based carbides. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
2
|
Phosphate Enrichment of Niobium-Based Catalytic Surfaces in Relation to Reactions of Carbohydrate Biomass Conversion: The Case Studies of Inulin Hydrolysis and Fructose Dehydration. Catalysts 2021. [DOI: 10.3390/catal11091077] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
In this work, some physical mixtures of Nb2O5·nH2O and NbOPO4 were prepared to study the role of phosphate groups in the total acidity of samples and in two reactions involving carbohydrate biomass: hydrolysis of polyfructane and dehydration of fructose/glucose to 5-hydroxymethylfurfural (HMF). The acid and catalytic properties of the mixtures were dominated by the phosphate group enrichment. Lewis and Brønsted acid sites were detected by FT-IR experiments with pyridine adsorption/desorption under dry and wet conditions. Lewis acidity decreased with NbP in the composition, while total acidity of the samples, measured by titrations with phenylethylamine in cyclohexane (~3.5 μeq m−2) and water (~2.7 μeq m−2), maintained almost the same values. Inulin conversion took advantage of the presence of surfaces rich in Brønsted sites, and NbOPO4 showed the best hydrolysis activity with glucose/fructose formation. The catalyst with a more phosphated surface showed less deactivation during the dehydration of fructose/glucose into HMF.
Collapse
|
3
|
Production of Gasolines and Monocyclic Aromatic Hydrocarbons: From Fossil Raw Materials to Green Processes. ENERGIES 2021. [DOI: 10.3390/en14134061] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The properties and the applications of the main monocyclic aromatic hydrocarbons (benzene, toluene, ethylbenzene, styrene, and the three xylene isomers) and the industrial processes for their manufacture from fossil raw materials are summarized. Potential ways for their production from renewable sources with thermo-catalytic processes are described and discussed in detail. The perspectives of the future industrial organic chemistry in relation to the production of high-octane bio-gasolines and monocyclic aromatic hydrocarbons as renewable chemical intermediates are discussed.
Collapse
|
4
|
Krzelj V, Ferrandez DP, Neira D’Angelo MF. Sulfonated foam catalysts for the continuous dehydration of xylose to furfural in biphasic media. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.12.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
5
|
Use of amorphous Nb2O5 and Nb2O5/Al2O3 as acid catalysts for the dehydration of xylose to furfural. REACTION KINETICS MECHANISMS AND CATALYSIS 2021. [DOI: 10.1007/s11144-021-01931-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
6
|
Stable Continuous Production of γ-Valerolactone from Biomass-Derived Levulinic Acid over Zr–Al-Beta Zeolite Catalyst. Catalysts 2020. [DOI: 10.3390/catal10060678] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The one-pot conversion of biomass-derived platform molecules such as levulinic acid (LA) and furfural (FAL) into γ-valerolactone (GVL) is challenging because of the need for adequate multi-functional catalysts and high-pressure gaseous hydrogen. As a more sustainable alternative, here we describe the transfer hydrogenation of LA to GVL using isopropanol as a hydrogen donor over a Zr-modified beta zeolite catalyst in a continuous fixed-bed reactor. A stable sustained production of GVL was achieved from the levulinic acid, with both high LA conversion (ca. 95%) and GVL yield (ca. 90%), for over at least 20 days in continuous operation at 170 °C. Importantly, the small decay in activity can be advantageously overcome by the means of a simple in situ thermal regeneration in the air atmosphere, leading to a complete recovery of the catalyst activity. Key to this outstanding result is the use of a Zr-modified dealuminated beta zeolite with a tailored Lewis/Brønsted acid sites ratio, which can synergistically catalyze the tandem steps of hydrogen transfer and acid-catalyzed transformations, leading to such a successful and stable production of GVL from LA.
Collapse
|
7
|
|
8
|
Li S, Yang Y, Shan H, Zhao J, Wang Z, Cai D, Qin P, Baeyens J, Tan T. Ultrafast and ultrahigh adsorption of furfural from aqueous solution via covalent organic framework-300. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.03.072] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
9
|
Abstract
In this study, niobia-based materials have been used as supports for Pt nanoparticles and used in the hydrogenation of furfural. The incorporation of dopants (W6+ and Ti4+) in the Nb2O5 structure induced modifications in the surface acidity of the support; in particular, the addition of W6+ increased the amount of Lewis acid sites, while the addition of Ti4+ decreased the number of Lewis acid sites. As a result, the catalytic activity towards the hydrogenation of furfural was affected; high surface acidity resulted in high catalytic activity. The selectivity of the reaction changed with the support acidity as well, with higher amount of furfuryl alcohol produced decreasing the Lewis acid sites.
Collapse
|
10
|
Gómez Millán G, Hellsten S, Llorca J, Luque R, Sixta H, Balu AM. Recent Advances in the Catalytic Production of Platform Chemicals from Holocellulosic Biomass. ChemCatChem 2019. [DOI: 10.1002/cctc.201801843] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Gerardo Gómez Millán
- Department of Bioproducts and Biosystems School of Chemical EngineeringAalto University Vuorimiehentie 1 02150 Espoo Finland
- Department of Chemical Engineering, Institute of Energy Technologies and Barcelona Research Center in Multiscale Science and EngineeringUniversitat Politècnica de Catalunya Eduard Maristany 10–14 08019 Barcelona Spain
| | - Sanna Hellsten
- Department of Bioproducts and Biosystems School of Chemical EngineeringAalto University Vuorimiehentie 1 02150 Espoo Finland
| | - Jordi Llorca
- Department of Chemical Engineering, Institute of Energy Technologies and Barcelona Research Center in Multiscale Science and EngineeringUniversitat Politècnica de Catalunya Eduard Maristany 10–14 08019 Barcelona Spain
| | - Rafael Luque
- Departamento de Química OrgánicaUniversidad de Cordoba Campus Rabanales Edificio Marie Curie (C-3), Ctra Nnal IV−A, km 396 Cordoba Spain
- Peoples Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya str. 117198 Moscow Russia
| | - Herbert Sixta
- Department of Bioproducts and Biosystems School of Chemical EngineeringAalto University Vuorimiehentie 1 02150 Espoo Finland
| | - Alina M. Balu
- Departamento de Química OrgánicaUniversidad de Cordoba Campus Rabanales Edificio Marie Curie (C-3), Ctra Nnal IV−A, km 396 Cordoba Spain
| |
Collapse
|
11
|
|
12
|
Perez RF, Albuquerque EM, Borges LEP, Hardacre C, Fraga MA. Aqueous-phase tandem catalytic conversion of xylose to furfuryl alcohol over [Al]-SBA-15 molecular sieves. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01235d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Catalytically active sites were controllably assembled into an SBA-15 framework by direct hydrothermal synthesis.
Collapse
Affiliation(s)
- Rafael F. Perez
- Instituto Militar de Engenharia
- Rio de Janeiro/RJ
- Brazil
- Instituto Nacional de Tecnologia/MCTIC
- Laboratório de Catálise
| | - Elise M. Albuquerque
- Instituto Nacional de Tecnologia/MCTIC
- Laboratório de Catálise
- Rio de Janeiro/RJ
- Brazil
| | | | - Christopher Hardacre
- School of Chemical Engineering and Analytical Science
- The University of Manchester
- The Mill
- Manchester M13 9PL
- UK
| | - Marco A. Fraga
- Instituto Militar de Engenharia
- Rio de Janeiro/RJ
- Brazil
- Instituto Nacional de Tecnologia/MCTIC
- Laboratório de Catálise
| |
Collapse
|
13
|
Romo JE, Bollar NV, Zimmermann CJ, Wettstein SG. Conversion of Sugars and Biomass to Furans Using Heterogeneous Catalysts in Biphasic Solvent Systems. ChemCatChem 2018; 10:4805-4816. [PMID: 30555599 PMCID: PMC6283062 DOI: 10.1002/cctc.201800926] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Indexed: 11/21/2022]
Abstract
Within the last decade, interest in using biphasic systems for producing furans from biomass has grown significantly. Biphasic systems continuously extract furans into the organic phase, which prevents degradation reactions and potentially allows for easier separations of the products. Several heterogeneous catalyst types, including zeolites, ion exchange resins, niobium-based, and others, have been used with various organic solvents to increase furan yields from sugar dehydration reactions. In this minireview, we summarized the use of heterogeneous catalysts in biphasic systems for furfural and 5-hydroxymethylfurfural production from the past five years, highlighting trends in chemical and physical properties that effect catalytic activity. Additionally, the selection of an organic solvent for a biphasic system is extremely important and we review and discuss properties of the most commonly used organic solvents.
Collapse
Affiliation(s)
- Joelle E. Romo
- Department of Chemical and Biological EngineeringMontana State UniversityBozeman59717-2220 MTUSA
| | - Nathan V. Bollar
- Department of Chemical and Biological EngineeringMontana State UniversityBozeman59717-2220 MTUSA
| | - Coy J. Zimmermann
- Department of Chemical and Biological EngineeringMontana State UniversityBozeman59717-2220 MTUSA
| | - Stephanie G. Wettstein
- Department of Chemical and Biological EngineeringMontana State UniversityBozeman59717-2220 MTUSA
| |
Collapse
|
14
|
Moreno-Marrodan C, Barbaro P, Caporali S, Bossola F. Low-Temperature Continuous-Flow Dehydration of Xylose Over Water-Tolerant Niobia-Titania Heterogeneous Catalysts. CHEMSUSCHEM 2018; 11:3649-3660. [PMID: 30106509 DOI: 10.1002/cssc.201801414] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/27/2018] [Indexed: 06/08/2023]
Abstract
The sustainable conversion of vegetable biomass-derived feeds to useful chemicals requires innovative routes meeting environmental and economical criteria. The approach herein pursued is the synthesis of water-tolerant, unconventional solid acid monolithic catalysts based on a mixed niobia-titania skeleton building up a hierarchical open-cell network of meso- and macropores, and tailored for use under continuous-flow conditions. The materials were characterized by spectroscopic, microscopy, and diffraction techniques, showing a reproducible isotropic structure and an increasing Lewis/Brønsted acid sites ratio with increasing Nb content. The catalytic dehydration reaction of xylose to furfural was investigated as a representative application. The efficiency of the catalyst was found to be dramatically affected by the niobia content in the titania lattice. The presence of as low as 2 wt % niobium resulted in the highest furfural yield at 140 °C under continuous-flow conditions, by using H2 O/γ-valerolactone as a safe monophasic solvent system. The interception of a transient 2,5-anhydroxylose species suggested the dehydration process occurs via a cyclic intermediates mechanism. The catalytic activity and the formation of the anhydro intermediate were related to the Lewis acid sites (LAS)/Brønsted acid sites (BAS) ratio and indicated a significant contribution of xylose-xylulose isomerization. No significant catalyst deactivation was observed over 4 days usage.
Collapse
Affiliation(s)
- Carmen Moreno-Marrodan
- Consiglio Nazionale delle Ricerche, Istituto di Chimica dei Composti Organo Metallici, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy
| | - Pierluigi Barbaro
- Consiglio Nazionale delle Ricerche, Istituto di Chimica dei Composti Organo Metallici, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy
| | - Stefano Caporali
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, Via Giusti 9, 50121, Firenze, Italy
- Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy
| | - Filippo Bossola
- Consiglio Nazionale delle Ricerche, Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133, Milano, Italy
| |
Collapse
|
15
|
Campisi S, Bennici S, Auroux A, Carniti P, Gervasini A. A Rational Revisiting of Niobium Oxophosphate Catalysts for Carbohydrate Biomass Reactions. Top Catal 2018. [DOI: 10.1007/s11244-018-0999-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
16
|
Delbecq F, Wang Y, Muralidhara A, El Ouardi K, Marlair G, Len C. Hydrolysis of Hemicellulose and Derivatives-A Review of Recent Advances in the Production of Furfural. Front Chem 2018; 6:146. [PMID: 29868554 PMCID: PMC5964623 DOI: 10.3389/fchem.2018.00146] [Citation(s) in RCA: 136] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 04/12/2018] [Indexed: 12/13/2022] Open
Abstract
Biobased production of furfural has been known for decades. Nevertheless, bioeconomy and circular economy concepts is much more recent and has motivated a regain of interest of dedicated research to improve production modes and expand potential uses. Accordingly, this review paper aims essentially at outlining recent breakthroughs obtained in the field of furfural production from sugars and polysaccharides feedstocks. The review discusses advances obtained in major production pathways recently explored splitting in the following categories: (i) non-catalytic routes like use of critical solvents or hot water pretreatment, (ii) use of various homogeneous catalysts like mineral or organic acids, metal salts or ionic liquids, (iii) feedstock dehydration making use of various solid acid catalysts; (iv) feedstock dehydration making use of supported catalysts, (v) other heterogeneous catalytic routes. The paper also briefly overviews current understanding of furfural chemical synthesis and its underpinning mechanism as well as safety issues pertaining to the substance. Eventually, some remaining research topics are put in perspective for further optimization of biobased furfural production.
Collapse
Affiliation(s)
- Frederic Delbecq
- Ecole Superieure de Chimie Organique et Minerale, Compiègne, France
| | - Yantao Wang
- Sorbonne Universités, Universite de Technologie de Compiegne, Compiègne, France
| | - Anitha Muralidhara
- Sorbonne Universités, Universite de Technologie de Compiegne, Compiègne, France.,Institut National de l'Environnement Industriel et des Risques, Verneuil-en-Halatte, France.,Avantium Chemicals, Amsterdam, Netherlands
| | - Karim El Ouardi
- Materials Science and Nano-Engineering Department, Mohammed VI Polytechnic University, Ben Guerir, Morocco
| | - Guy Marlair
- Institut National de l'Environnement Industriel et des Risques, Verneuil-en-Halatte, France
| | - Christophe Len
- Sorbonne Universités, Universite de Technologie de Compiegne, Compiègne, France.,Institut de Recherche de Chimie Paris, PSL University, Chimie ParisTech, Paris, France
| |
Collapse
|
17
|
Ye J, Zhou M, Wang K, Chen S, Xu J, Jiang J. Catalytic Conversion of Bamboo Meal to High-Yield Furfural With Solid Acid Catalyst FePO4
⋅2H2
O. ChemistrySelect 2017. [DOI: 10.1002/slct.201702115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jun Ye
- Institute of New Technology of Forestry; Chinese Academy of Forestry; Beijing 100091 China
- Institute of Chemical Industry of Forest Products; Chinese Academy of Forestry, Jiangsu Province; Nanjing 210042 China
| | - Minghao Zhou
- Institute of Chemical Industry of Forest Products; Chinese Academy of Forestry, Jiangsu Province; Nanjing 210042 China
| | - Kui Wang
- Institute of Chemical Industry of Forest Products; Chinese Academy of Forestry, Jiangsu Province; Nanjing 210042 China
| | - Shuigen Chen
- Institute of Chemical Industry of Forest Products; Chinese Academy of Forestry, Jiangsu Province; Nanjing 210042 China
| | - Junming Xu
- Institute of New Technology of Forestry; Chinese Academy of Forestry; Beijing 100091 China
| | - Jianchun Jiang
- Institute of Chemical Industry of Forest Products; Chinese Academy of Forestry, Jiangsu Province; Nanjing 210042 China
| |
Collapse
|
18
|
Xue XX, Di JH, He YC, Wang BQ, Ma CL. Effective Utilization of Carbohydrate in Corncob to Synthesize Furfuralcohol by Chemical-Enzymatic Catalysis in Toluene-Water Media. Appl Biochem Biotechnol 2017; 185:42-54. [PMID: 29082476 DOI: 10.1007/s12010-017-2638-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 10/17/2017] [Indexed: 11/27/2022]
Abstract
In this study, carbohydrates (cellulose plus hemicellulose) in corncob were effectively converted furfuralcohol (FOL) via chemical-enzymatic catalysis in a one-pot manner. After corncob (2.5 g, dry weight) was pretreated with 0.5 wt% oxalic acid, the obtained corncob-derived xylose (19.8 g/L xylose) could be converted to furfural at 60.1% yield with solid acid catalyst SO42-/SnO2-attapulgite (3.6 wt% catalyst loading) in the water-toluene (3:1, v/v) at 170 °C for 20 min. Moreover, the oxalic acid-pretreated corncob residue (1.152 g, dry weight) was enzymatically hydrolyzed to 0.902 g glucose and 0.202 g arabinose. Using the corncob-derived glucose (1.0 mM glucose/mM furfural) as cosubstrate, the furfural liquor (48.3 mM furfural) was successfully biotransformed to FOL by recombinant Escherichia coli CCZU-A13 cells harboring an NADH-dependent reductase (SsCR) in the water-toluene (4:1, v/v) under the optimum conditions (50 mM PEG-6000, 0.2 mM Zn2+, 0.1 g wet cells/mL, 30 °C, pH 6.5). After the bioreduction for 2 h, FAL was completely converted to FOL. The FOL yield was obtained at 0.11 g FOL/g corncob. Clearly, this one-pot synthesis strategy shows high potential application for the effective synthesis of FOL.
Collapse
Affiliation(s)
- Xin-Xia Xue
- Platform of Biofuels and Biobased Products, Changzhou University, Changzhou, China
| | - Jun-Hua Di
- Platform of Biofuels and Biobased Products, Changzhou University, Changzhou, China
| | - Yu-Cai He
- Platform of Biofuels and Biobased Products, Changzhou University, Changzhou, China. .,Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, China. .,Key Laboratory of Fermentation (Ministry of Education), Hubei University of Technology, Wuhan, China.
| | - Bing-Qian Wang
- Platform of Biofuels and Biobased Products, Changzhou University, Changzhou, China
| | - Cui-Luan Ma
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, China.
| |
Collapse
|
19
|
Yang T, Zhou YH, Zhu SZ, Pan H, Huang YB. Insight into Aluminum Sulfate-Catalyzed Xylan Conversion into Furfural in a γ-Valerolactone/Water Biphasic Solvent under Microwave Conditions. CHEMSUSCHEM 2017; 10:4066-4079. [PMID: 28856818 DOI: 10.1002/cssc.201701290] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 08/11/2017] [Indexed: 05/26/2023]
Abstract
A simple and efficient biphasic system with an earth-abundant metal salt catalyst was used to produce furfural from xylan with a high yield of up to 87.8 % under microwave conditions. Strikingly, the metal salt Al2 (SO4 )3 exhibited excellent catalytic activity for xylan conversion, owing to a combination of Lewis and Brønsted acidity and its ability to promote good phase separation. The critical role of the SO42- anion was first analyzed, which resulted in the aforementioned characteristics when combined with the Al3+ cation. The mixed solvent system with γ-valerolactone (GVL) as the organic phase provided the highest furfural yield, resulting from its good dielectric properties and dissolving capacity, which facilitated the absorption of microwave energy and promoted mass transfer. Mechanistic studies suggested that the xylan-to-furfural conversion proceeded mainly through a hydrolysis-isomerization-dehydration pathway and the hexa-coordinated Lewis acidic [Al(OH)2 (aq)]+ species were the active sites for xylose-xylulose isomerization. Detailed kinetic studies of the subreaction for the xylan conversion revealed that GVL regulates the reaction rates and pathways by promoting the rates of the key steps involved for furfural production and suppressing the side reactions for humin production. Finally, the Al2 (SO4 )3 catalyst was used for the production of furfural from several lignocellulosic feedstocks, revealing its great potential for other biomass conversions.
Collapse
Affiliation(s)
- Tao Yang
- College of Chemical Engineering, Nanjing Forestry University, Longpan Road 159#, Nanjing, P.R: China
| | - Yi-Han Zhou
- College of Chemical Engineering, Nanjing Forestry University, Longpan Road 159#, Nanjing, P.R: China
| | - Sheng-Zhen Zhu
- College of Chemical Engineering, Nanjing Forestry University, Longpan Road 159#, Nanjing, P.R: China
| | - Hui Pan
- College of Chemical Engineering, Nanjing Forestry University, Longpan Road 159#, Nanjing, P.R: China
| | - Yao-Bing Huang
- College of Chemical Engineering, Nanjing Forestry University, Longpan Road 159#, Nanjing, P.R: China
| |
Collapse
|
20
|
|
21
|
Pinto MB, Soares AL, Mella Orellana A, Duarte HA, De Abreu HA. Structural, Electronic, and Thermodynamic Properties of the T and B Phases of Niobia: First-Principle Calculations. J Phys Chem A 2017; 121:2399-2409. [PMID: 28291341 DOI: 10.1021/acs.jpca.6b11383] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Different polymorphs of Nb2O5 can be obtained depending on the pressure and temperature of calcination leading to different catalytic properties. Two polymorphs of niobia, T-Nb2O5 and B-Nb2O5, have been investigated by means of density functional/plane waves method. The equation of state predicted that B-Nb2O5 phase is more stable than the T-Nb2O5 at low temperature; however at high pressure both phases are stable. These results are in good agreement with the available experimental data. The calculated cohesive energies of 6.63 and 6.59 eV·atom-1 for the B-Nb2O5 and T-Nb2O5, respectively, also corroborate this conclusion, and it can be compared to the experimental value of 9.56 eV atom-1 estimated for the most thermodynamically stable phase. The topological analyses based on quantum theory of atoms in molecules (QTAIM) and electron localization function (ELF) were applied and reveal bonds with large ionic character for both phases. The B-Nb2O5 presented larger stiffness than T-Nb2O5, and the oxygen sites in the T-Nb2O5 are more compressible. The density of states comparison for both structures indicates that B-Nb2O5 has lower concentration of acid sites compared to T-Nb2O5. This result is consistent with the experimental observations that the concentration of Lewis acid sites decreases with the temperature.
Collapse
Affiliation(s)
- Mirele B Pinto
- GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais , Belo Horizonte 31270-901, MG, Brazil
| | - Antonio Lenito Soares
- GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais , Belo Horizonte 31270-901, MG, Brazil
| | - Andy Mella Orellana
- Departamento de Física, Facultad de Ciencias, Universidad de Chile , Santiago, Chile
| | - Hélio A Duarte
- GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais , Belo Horizonte 31270-901, MG, Brazil
| | - Heitor A De Abreu
- GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais , Belo Horizonte 31270-901, MG, Brazil
| |
Collapse
|
22
|
Ly N, Al-Shamery K, Chan-Thaw CE, Prati L, Carniti P, Gervasini A. Impact of Support Oxide Acidity in Pt-Catalyzed HMF Hydrogenation in Alcoholic Medium. Catal Letters 2016. [DOI: 10.1007/s10562-016-1945-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
23
|
Machado G, Leon S, Santos F, Lourega R, Dullius J, Mollmann ME, Eichler P. Literature Review on Furfural Production from Lignocellulosic Biomass. ACTA ACUST UNITED AC 2016. [DOI: 10.4236/nr.2016.73012] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|