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Ivakhnov AD, Shavrina IS, Kosyakov DS, Dumanskii IO. Transformation of Vanillin in Sub- and Supercritical Propanol-2 Media. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s199079312107006x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Modified Cellulose with BINAP-Supported Rh as an Efficient Heterogeneous Catalyst for Asymmetric Hydrogenation. Catalysts 2022. [DOI: 10.3390/catal12010083] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Asymmetric catalysis is the preferred method for the synthesis of pure chiral molecules in the fine chemical industry. Cellulose has long been sought as a support in enantioselective catalysis. Dialdehyde cellulose (DAC) is produced by the selective oxidation of cellulose and is used to bind 5,5′-diamino Binap by forming a Schiff base. Here, we report the synthesis of modified cellulose-supported Rh as a novel biomass-supported catalyst and the characterization of its morphology, composition, and thermal stability. DAC-BINAP-Rh was a very effective catalyst in the asymmetric hydrogenation of enamides and could be easily recycled. This work provides a novel supported catalyst that broadens the applications of cellulose in asymmetric catalysis.
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Upgrading of Coffee Biocrude Oil Produced by Pyrolysis of Spent Coffee Grounds: Behavior of Fatty Acids in Supercritical Ethanol Reaction and Catalytic Cracking. Processes (Basel) 2021. [DOI: 10.3390/pr9050835] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Spent coffee grounds contain lipids (fatty acids) in addition to cellulose, hemicellulose, and lignin. The reaction process for upgrading biocrude oil produced from spent coffee grounds is different from that followed for upgrading biomass pyrolysis oil, such as processes that utilize sawdust. The feasibility of upgrading coffee biocrude oil through a supercritical ethanol reaction with plastic pyrolysis oil and through catalytic cracking for the improvement of the undesirable properties of biocrude oil, caused by the presence of oxygenated compounds, was evaluated. The initial oxygen content of the coffee biocrude oil was 16.9 wt%. The oil comprised a total content of 40.9% fatty acids, as found by analyzing the GC-MS peak area. After the supercritical ethanol reaction at 340 ∘C, the oxygen content was decreased to 9.9 wt%. When the MgNiMo/AC catalyst was applied to the supercritical reaction, the oxygen content was further decreased to 8.5 wt%. The esterification of the fatty acids in the biocrude oil with ethanol converted them to esters. After the supercritical reaction of coffee biocrude oil with plastic pyrolysis oil (1:2 (w/w)), the oxygen content was 6.4 wt%. After the catalytic cracking of the biocrude oil by Ni/MCM-41 at 400 ∘C, the fatty acids were converted to hydrocarbons, C9 to C21, and the oxygen content decreased to a final value of 2.8 wt%.
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Queiroz LS, de Souza LKC, Thomaz KTC, Leite Lima ET, da Rocha Filho GN, do Nascimento LAS, de Oliveira Pires LH, Faial KDCF, da Costa CEF. Activated carbon obtained from amazonian biomass tailings (acai seed): Modification, characterization, and use for removal of metal ions from water. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 270:110868. [PMID: 32721313 DOI: 10.1016/j.jenvman.2020.110868] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 05/21/2020] [Accepted: 05/27/2020] [Indexed: 05/12/2023]
Abstract
Acai seed was used herein as an Amazon biomass waste for the synthesis of activated and modified carbon in order to find a possible use for the large volume of residues generated during the processing of this fruit and to add value to this residue. Activated carbon materials were used to remove Pb2+, Fe2+, and Mg2+ metal ions from water. The efficiency of removal of these ions by the acai seed activated carbon was compared with that by commercial activated carbon. Activated carbon materials were prepared by carbonization and chemical activation using two KOH impregnation ratios, namely 1:1 (ACK1) and 5:1 (ACK5), by mass. These samples were modified by treatment with nitric acid under microwave heating (ACK1-M) and (ACK5-M), respectively. The result of the elemental analysis indicated that this biomass has carbon and sulfur contents of 43.29% and 0.10% wt, respectively. The textural parameters showed that the obtained activated carbon samples presented high surface areas between 1462 and 2774 m2 g-1. Raman analysis revealed the different degrees of graphitization of the activated carbon materials. Boehm titration identified the presence of phenolic, carboxylic, and lactonic groups in samples that were confirmed by Fourier transform infrared spectroscopy. In the metal adsorption tests, ACK5-M showed better removal efficiency, reaching 86% removal for Pb2+, 69% for Fe2+, and 8% for Mg2+in 1 h of contact time; these results were superior to those obtained for commercial carbon. The results indicated that acai seed can be used for the production of activated carbon and can also be used for metal removal.
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Affiliation(s)
- Leandro S Queiroz
- Laboratory of Catalysis and Oilchemistry, Laboratory of Amazon Oils and Graduate Program of Chemistry, Federal University of Pará Augusto Corrêa Street, Guamá, CEP 66075- 110, Belém, Pará, Brazil.
| | - Luiz K C de Souza
- Federal University of Amazonas, Department of Chemistry, Manaus, Amazonas, 69080-900, Brazil
| | - Kelly Taise C Thomaz
- Laboratory of Catalysis and Oilchemistry, Laboratory of Amazon Oils and Graduate Program of Chemistry, Federal University of Pará Augusto Corrêa Street, Guamá, CEP 66075- 110, Belém, Pará, Brazil; Evandro Chagas Institute, Environment Section, CEP 67000-030, Ananindeua, PA, Brazil
| | - Erika Tallyta Leite Lima
- Laboratory of Catalysis and Oilchemistry, Laboratory of Amazon Oils and Graduate Program of Chemistry, Federal University of Pará Augusto Corrêa Street, Guamá, CEP 66075- 110, Belém, Pará, Brazil
| | - Geraldo N da Rocha Filho
- Laboratory of Catalysis and Oilchemistry, Laboratory of Amazon Oils and Graduate Program of Chemistry, Federal University of Pará Augusto Corrêa Street, Guamá, CEP 66075- 110, Belém, Pará, Brazil
| | - Luis Adriano S do Nascimento
- Laboratory of Catalysis and Oilchemistry, Laboratory of Amazon Oils and Graduate Program of Chemistry, Federal University of Pará Augusto Corrêa Street, Guamá, CEP 66075- 110, Belém, Pará, Brazil
| | - Luiza H de Oliveira Pires
- Laboratory of Catalysis and Oilchemistry, Laboratory of Amazon Oils and Graduate Program of Chemistry, Federal University of Pará Augusto Corrêa Street, Guamá, CEP 66075- 110, Belém, Pará, Brazil
| | | | - Carlos E F da Costa
- Laboratory of Catalysis and Oilchemistry, Laboratory of Amazon Oils and Graduate Program of Chemistry, Federal University of Pará Augusto Corrêa Street, Guamá, CEP 66075- 110, Belém, Pará, Brazil
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Pirbazari SM, Norouzi O, Kohansal K, Tavasoli A. Experimental studies on high-quality bio-oil production via pyrolysis of Azolla by the use of a three metallic/modified pyrochar catalyst. BIORESOURCE TECHNOLOGY 2019; 291:121802. [PMID: 31352164 DOI: 10.1016/j.biortech.2019.121802] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 07/10/2019] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
In this study, the potential of the pyrolysis method to overcome the negative effects of Azolla-filiculoides in infected areas was thoroughly investigated. Non-catalytic pyrolysis experiments were conducted at a temperature range of 400-700 °C. The highest possible bio-oil yield (35 wt%) was attained at 500 °C. To achieve the best chemical composition of bio-oil and higher amount of synthesis gas the catalytic pyrolysis were conducted in a dual-bed quartz reactor at the optimum temperature (500 °C). Although, all three catalysts (pyro-char, modified pyro-char (MPC), and Mg-Ni-Mo/MPC) showed almost an impressive performance in promotion of the common reactions, Mg-Ni-Mo/MPC catalyst have illustrated the stunning results by increasing the percentage of furan compounds from 5.25% to 33.07%, and decreasing the acid compounds from 25.56% to 9.09%. Using GC-MS and GC-FID liquid and gaseous products were fully analyzed. The carbon-based catalysts were also evaluated via FTIR, FESEM, EDX, and BET analyses.
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Affiliation(s)
- S M Pirbazari
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Omid Norouzi
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Komeil Kohansal
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Ahmad Tavasoli
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
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