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Wesner A, Papajewski MP, Schidowski L, Ruhmlieb C, Poller MJ, Albert J. Supported H 8PV 5Mo 7O 40 on activated carbon: Synthesis and Investigation of influencing factors for catalytic performance. Dalton Trans 2024; 53:14065-14076. [PMID: 39113545 DOI: 10.1039/d4dt01336k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/21/2024]
Abstract
Polyoxometalates (POMs), in particular the Keggin-type HPA-5 (H8PV5Mo7O40) are widely established as effective catalysts for acid- and redox-catalyzed reactions. Yet, they are mainly used as homogeneous catalysts, which poses challenges regarding catalyst separation. This study explores the synthesis of supported HPA-5, and its application as a heterogeneous catalyst for biomass conversion, focusing on activated carbons with diverse chemical and physical properties as support materials. Characterization of these carbons gives insights into the influence of surface area, oxygen content, and acidity on HPA adsorption and stability. Activated carbon CW20, was found to be the best support due to its high vanadium loading and effective preservation of the HPA-5 structure. It underwent various pre- and post-treatments, and the obtained supported catalysts were evaluated for their catalytic performance in converting glucose under both oxidative (OxFA process) and inert (Retro-Aldol condensation) conditions. Notably, HPA-5 supported on CW20 emerged as an exceptional catalyst for the retro-aldol condensation of glucose to lactic acid, achieving a selectivity of 15% and a conversion rate of 71%, with only minimal vanadium leaching.
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Affiliation(s)
- Anne Wesner
- Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany
| | - Max P Papajewski
- Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany
| | - Leon Schidowski
- Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany
| | - Charlotte Ruhmlieb
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany.
| | - Maximilian J Poller
- Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany
| | - Jakob Albert
- Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany
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Salazar Marcano D, Savić ND, Abdelhameed SAM, de Azambuja F, Parac-Vogt TN. Exploring the Reactivity of Polyoxometalates toward Proteins: From Interactions to Mechanistic Insights. JACS AU 2023; 3:978-990. [PMID: 37124292 PMCID: PMC10131212 DOI: 10.1021/jacsau.3c00011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 01/31/2023] [Accepted: 02/01/2023] [Indexed: 05/03/2023]
Abstract
The latest advances in the study of the reactivity of metal-oxo clusters toward proteins showcase how fundamental insights obtained so far open new opportunities in biotechnology and medicine. In this Perspective, these studies are discussed through the lens of the reactivity of a family of soluble anionic metal-oxo nanoclusters known as polyoxometalates (POMs). POMs act as catalysts in a wide range of reactions with several different types of biomolecules and have promising therapeutic applications due to their antiviral, antibacterial, and antitumor activities. However, the lack of a detailed understanding of the mechanisms behind biochemically relevant reactions-particularly with complex biological systems such as proteins-still hinders further developments. Hence, in this Perspective, special attention is given to reactions of POMs with peptides and proteins showcasing a molecular-level understanding of the reaction mechanism. In doing so, we aim to highlight both existing limitations and promising directions of future research on the reactivity of metal-oxo clusters toward proteins and beyond.
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da Silva MJ, Ribeiro CJA, Rodrigues AA. H4PMo11VO40-Catalyzed β-Citronellal Condensation Reactions. Catal Letters 2023. [DOI: 10.1007/s10562-023-04274-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Hydration of Camphene over PW-SBA-15-SO 3H. Molecules 2022; 28:molecules28010006. [PMID: 36615200 PMCID: PMC9822151 DOI: 10.3390/molecules28010006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022] Open
Abstract
The hydration of camphene was carried out over SBA-15 with sulfonic acid groups and tungstophosphoric acid at 50 °C. The main product of camphene hydration was isoborneol, with camphene hydrate and borneol as byproducts. The catalytic activity increased with the amount of tungstophosforic acid (PW) immobilized on the silica support until a maximum, which was obtained with the PW4-SBA-15-SO3H material (16.4 wt.%). When the amount of PW immobilized on SBA-15 increased (PW5-SBA-15-SO3H, 21.2 wt.%), the catalytic activity decreased. The catalytic activity of PW4-SBA-15-SO3H increased with the water content of the solvent, until a maximum was reached with 50% water. With higher water concentrations, a decrease in the catalytic activity was observed. The selectivity to isoborneol was 90% at 99% camphene conversion in the presence of the PW4-SBA-15-SO3H catalyst. The catalytic stability of the PW4-SBA-15-SO3H material during camphene hydration was studied by performing consecutive batch runs with the same catalyst sample. After the third run, a trend towards stabilized catalytic activity was observed. A kinetic model is also proposed.
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Hombach L, Simitsis N, Vossen JT, Vorholt AJ, Beine AK. Solidified and Immobilized Heteropolyacids for the Valorization of Lignocellulose. ChemCatChem 2022. [DOI: 10.1002/cctc.202101838] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lea Hombach
- Max-Planck-Institute for Chemical Energy Conversion: Max-Planck-Institut fur chemische Energiekonversion Solid Molecular Catalysts GERMANY
| | - Natalia Simitsis
- RWTH Aachen University: Rheinisch-Westfalische Technische Hochschule Aachen ITMC GERMANY
| | - Jeroen Thomas Vossen
- Max-Planck-Institute for Chemical Energy Conversion: Max-Planck-Institut fur chemische Energiekonversion Molecular Catalysis GERMANY
| | - Andreas J. Vorholt
- Max-Planck-Institute for Chemical Energy Conversion: Max-Planck-Institut fur chemische Energiekonversion Molecular Catalysis GERMANY
| | - Anna Katharina Beine
- Max-Planck-Institut fur chemische Energiekonversion solid molecular catalysts Stiftstr. 36-38 45470 Mülheim an der Ruhr GERMANY
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Abstract
Glycerol acetalization with citral was studied using a heteropolyacid (tungstophosphoric acid) supported on KIT-6, as a catalyst, at 100 °C. Different catalysts were synthesized. Catalysts were characterized by scanning electron microscopy (SEM), inductively coupled plasma (ICP), X-ray diffraction (XRD), attenuated total refletion-Fourier transform infrared spectroscopy (ATR-FTIR), and potentiometric titrations. At a fixed time, the glycerol conversion increased with the H3PW12O40 (PW) on KIT-6. PW4-KIT-6 material had a higher conversion than other catalysts. The optimization of glycerol’s acetalization with citral was studied under the PW4-KIT-6 catalyst. After 5 h, it was found that, at T = 100 °C, with m = 0.3 g of solid, molar glycerol:citral = 1:2.25, the conversion of glycerol was 89%. Moreover, the PW4-KTI-6 catalyst showed good catalytic stability.
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Sosa AA, Palermo V, Langer P, Luque R, Romanelli GP, Pizzio LR. Tungstophosphoric acid/mesoporous silicas as suitable catalysts in quinoxaline synthesis. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2021.112046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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José da Silva M, Vergara Torres JA, Vilanculo CB. Vanadium-doped phosphomolybdic acids as catalysts for geraniol oxidation with hydrogen peroxide. RSC Adv 2022; 12:11796-11806. [PMID: 35481091 PMCID: PMC9016745 DOI: 10.1039/d2ra01258h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 04/11/2022] [Indexed: 11/21/2022] Open
Abstract
The vanadium-doped phosphomolybdic acid (H4PMo11VO40) was the most active and selective heteropoly catalyst in one-pot oxidative esterification of benzaldehyde with hydrogen peroxide.
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Affiliation(s)
- Márcio José da Silva
- Marcio Jose da Silva, Chemistry Department, Federal University of Vicosa, University Campus, Avenue P.H. Rolfs, Vicosa, 36570-000, Minas Gerais State, Brazil
| | - Jonh Alexander Vergara Torres
- Marcio Jose da Silva, Chemistry Department, Federal University of Vicosa, University Campus, Avenue P.H. Rolfs, Vicosa, 36570-000, Minas Gerais State, Brazil
| | - Castelo Bandane Vilanculo
- Castelo Bandane Vilanculo, Chemistry Department, Pedagogic University of Mozambique, FCNM, Campus of Lhanguene, Av. de Moçambique, Km 1, Maputo, Mozambique, 4040
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Can Brønsted acids catalyze the epoxidation of allylic alcohols with H2O2? With a little help from the proton, the H3PMo12O40 acid did it and well. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111780] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Vilanculo CB, da Silva MJ, Rodrigues AA, Ferreira SO, da Silva RC. Vanadium-doped sodium phosphomolybdate salts as catalysts in the terpene alcohols oxidation with hydrogen peroxide. RSC Adv 2021; 11:24072-24085. [PMID: 35479047 PMCID: PMC9036646 DOI: 10.1039/d1ra04191f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 06/28/2021] [Indexed: 11/21/2022] Open
Abstract
In this work, we have explored the catalytic activity of Keggin-type heteropolyanions PMo12−nVnO40(3+n)− (n = 0, 1, 2, or 3) in the form of sodium salts in green oxidation routes of terpene alcohols with hydrogen peroxide. Nerol was the model molecule selected to assess the impacts of the main reaction parameters, such as temperature, catalyst load, and stoichiometry of reactants. The impacts of the presence of vanadium at different proportions (i.e., V1, V2, and V3 loads/per anion) in the structure of phosphomolybdate catalysts were assessed. All the catalysts were characterized by various techniques such as powder X-ray diffraction, attenuated diffuse reflectance infrared spectroscopy, ultraviolet-visible spectroscopy, thermogravimetric analysis, isotherms of adsorption–desorption of N2 measurements of surface area, scanning electronic microscopy, energy-dispersive X-ray spectroscopy, and n-butylamine potentiometric titration. Among the catalysts assessed, Na4PMo11VO40 was the most active and selective toward epoxides. The efficiency of this catalyst in the epoxidation of different terpene alcohols was investigated. Special attention was dedicated to correlating the composition and properties of the vanadium-doped phosphomolybdic catalysts with their catalytic activity. In this work, we have explored the catalytic activity of Keggin-type heteropolyanions PMo12−nVnO40(3+n)− (n = 0, 1, 2, or 3) in the form of sodium salts in green oxidation routes of terpene alcohols with hydrogen peroxide.![]()
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Affiliation(s)
- Castelo Bandane Vilanculo
- Chemistry Department, Pedagogic University of Mozambique, FCNM Campus of Lhanguene, Av. de Moçambique, Km 1 Maputo Zipcode: 4040 Mozambique +258 825573337
| | - Márcio José da Silva
- Chemistry Department, Pedagogic University of Mozambique, FCNM Campus of Lhanguene, Av. de Moçambique, Km 1 Maputo Zipcode: 4040 Mozambique +258 825573337
| | - Alana Alves Rodrigues
- Chemistry Department, Pedagogic University of Mozambique, FCNM Campus of Lhanguene, Av. de Moçambique, Km 1 Maputo Zipcode: 4040 Mozambique +258 825573337
| | | | - Rene Chagas da Silva
- Chemistry Department, Federal University of Viçosa Minas Gerais State 36590-000 Brazil
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Colombo Migliorero MB, Palermo V, Romanelli GP, Vázquez PG. New niobium heteropolyacid included in a silica/alumina matrix: Application in selective sulfoxidation. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.10.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Kumar A. Dissolving pulp production: Cellulases and xylanases for the enhancement of cellulose accessibility and reactivity. PHYSICAL SCIENCES REVIEWS 2021. [DOI: 10.1515/psr-2019-0047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Dissolving pulps are high-grade cellulose pulps that have minimum amount of non-cellulosic impurities. Dissolving pulps are the basic source for the manufacturing of several cellulosic products such as viscose, lyocell, cellulose acetates, cellulose nitrates, carboxymethyl-cellulose, etc. Dissolving pulps are mainly manufactured by pre-hydrolysis kraft and acid sulphite pulping. A high reactivity of dissolving pulps is desirable for its eco-friendly utilization for several purposes. Several approaches including mechanical, chemical, ultrasonic, and enzymatic treatments have been employed for the improvement of pulp reactivity. This review mainly focussed on pulp reactivity improvement through enzymatic approaches. Cellulases and xylanase have been proved effective for the improvement of pulp reactivity of dissolving pulp from different sources. The different combinations of cellulase, xylanase, and mechanical refining have been tested and found more effective rather than the single one.
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Affiliation(s)
- Amit Kumar
- Department of Biotechnology , College of Natural and Computational Sciences, Debre Markos University , Debre Markos , 269 Ethiopia
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Gallego-Villada LA, Alarcón EA, Palermo V, Vázquez PG, Romanelli GP. Kinetics for the biodiesel production from lauric acid over Keggin heteropolyacid loaded in silica framework. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.08.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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14
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Yang G, Liu Y, Li K, Liu W, Yu B, Hu C. H3PMo12O40-catalyzed coupling of diarylmethanols with epoxides/diols/aldehydes toward polyaryl-substituted aldehydes. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2020.07.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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15
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Direct Alcoholysis of Carbohydrate Precursors and Real Cellulosic Biomasses to Alkyl Levulinates: A Critical Review. Catalysts 2020. [DOI: 10.3390/catal10101221] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Alkyl levulinates (ALs) represent outstanding bio-fuels and strategic bio-products within the context of the marketing of levulinic acid derivatives. However, their synthesis by acid-catalyzed esterification of pure levulinic acid, or by acid-catalyzed alcoholysis of furfuryl alcohol, although relatively simple, is still economically disadvantageous, due to the high costs of the pure precursors. The direct one-pot alcoholysis of model C6 carbohydrates and raw biomass represents an alternative approach for the one-step synthesis of ALs. In order to promote the market for these bio-products and, concurrently, the immediate development of new applications, it is necessary to speed up the intensification of their production processes, and this important achievement is onlypossible by using low-cost or, even better, waste biomasses, as starting feedstocks. This review provides an overview of the most recent and promising advances on the one-pot production of ALs from model C6 carbohydrates and real biomasses, in the presence of homogeneous or heterogeneous acid catalysts. The use of model C6 carbohydrates allows for the identification of the best obtainable ALs yields, resulting in being strategic for the development of new smart catalysts, whose chemical properties must be properly tuned, taking into account the involved reaction mechanism. On the other hand, the transition to the real biomass now represents a necessary choice for allowing the next ALs production on a larger scale. The improvement of the available synthetic strategies, the use of raw materials and the development of new applications for ALs will contribute to develop more intensified, greener, and sustainable processes.
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Liu H, Han J, Huang Q, Shen H, Lei L, Huang Z, Zhang Z, Zhao ZK, Wang F. Catalytic Hydrodeoxygenation of Methyl Stearate and Microbial Lipids to Diesel-Range Alkanes over Pd/HPA-SiO 2 Catalysts. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c02187] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Huifang Liu
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Jianyu Han
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Qitian Huang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Hongwei Shen
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Lijun Lei
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Zhipeng Huang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Zhixin Zhang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Zongbao K. Zhao
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Feng Wang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
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Pardo Cuervo OH, Romanelli GP, Cubillos JA, Rojas HA, Martínez JJ. Selective Catalytic Dehydration of Xylose to Furfural and Fructose and Glucose to 5‐Hydroximethylfurfural (HMF) Using Preyssler Heteropolyacid. ChemistrySelect 2020. [DOI: 10.1002/slct.202000657] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Oscar H. Pardo Cuervo
- Escuela de Ciencias QuímicasFacultad de CienciasUniversidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte Tunja Boyacá Colombia
| | - Gustavo P. Romanelli
- Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. J. J. Ronco” (CINDECA)Departamento de QuímicaFacultad de Ciencias ExactasUniversidad Nacional de la Plata Calle 47 No. 257 La Plata B1900 AJK Argentina
| | - Jairo A. Cubillos
- Escuela de Ciencias QuímicasFacultad de CienciasUniversidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte Tunja Boyacá Colombia
| | - Hugo A. Rojas
- Escuela de Ciencias QuímicasFacultad de CienciasUniversidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte Tunja Boyacá Colombia
| | - José J. Martínez
- Escuela de Ciencias QuímicasFacultad de CienciasUniversidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte Tunja Boyacá Colombia
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18
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Glycerol conversion into biofuel additives by acetalization with pentanal over heteropolyacids immobilized on zeolites. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.04.048] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Challagulla S, Payra S, Chakraborty C, Singh SA, Roy S. Understanding the role of catalytic active sites for heterogeneous photocatalytic oxidation of methanol and thermal reduction of NOx. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.110505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ali B, Imar S, Laffir F, McCormac T. Electrochemical, surface and electrocatalytic properties of electrode multilayer assemblies composed of a ruthenium metallodendrimer and a wheel-shaped Cu-20 Tungstophosphate. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.01.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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New trends in improving gasoline quality and octane through naphtha isomerization: a short review. APPLIED PETROCHEMICAL RESEARCH 2018. [DOI: 10.1007/s13203-018-0204-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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22
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Benavente P, Cárdenas-Lizana F, Keane MA. Promotional effect of water in the clean continuous production of carvacrol from carvone. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.09.059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Wang X, Duan C, Zhao C, Meng J, Qin X, Xu Y, Ni Y. Heteropoly acid catalytic treatment for reactivity enhancement and viscosity control of dissolving pulp. BIORESOURCE TECHNOLOGY 2018; 253:182-187. [PMID: 29353748 DOI: 10.1016/j.biortech.2018.01.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 01/03/2018] [Accepted: 01/04/2018] [Indexed: 06/07/2023]
Abstract
The reactivity enhancement and viscosity control are of practical importance during the manufacture of high-quality cellulose (also known as dissolving pulp). In the study, the concept of using phosphotungstic acid (HPW) for this purpose was demonstrated. The Fock reactivity of resultant pulp increased from 49.1% to 74.1% after the HPW catalytic treatment at a dosage of 86.4 mg HPW/g odp. The improved results can be attributed to the increased fiber accessibility, thanks to the favorable fiber morphologic changes, such as increased pore volume/size, water retention value and specific surface area. HPW can be readily recycled/reused by evaporating method, where maintaining 87.1% catalytic activity after six recycle times. The HPW catalytic treatment concept may provide a green alternative for the manufacture of high-quality dissolving pulp.
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Affiliation(s)
- Xinqi Wang
- College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Chao Duan
- College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science and Technology, Xi'an 710021, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Chengxin Zhao
- College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Jingru Meng
- College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Xiaoyu Qin
- College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Yongjian Xu
- College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Yonghao Ni
- College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science and Technology, Xi'an 710021, China; Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
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