Pub Date : 2023-09-08DOI: 10.18412/1816-0387-2023-4-34-44
S. Selishcheva, A. A. Sumina, O. Bulavchenko, V. Yakovlev
Highly loaded copper-containing catalysts synthesized by different methods (sol-gel, alloying and coprecipitation) were studied in hydroconversion of furfural in a batch reactor at a hydrogen pressure 5.0 MPA and temperature 100 °С. The reduction temperature and phase composition of the catalysts were determined using physicochemical methods. The highest activity in the process under consideration was observed for the coprecipitated copper-alumina catalyst, which at 100–130 °С allows obtaining furfuryl alcohol with 100 % selectivity; in addition, 2-methylfuran can be produced in the presence of this catalyst with the yield of 65 % at 200 °С. The phase composition of the catalyst reduced at a chosen temperature and the catalyst after the reaction was determined.
{"title":"Highly loaded copper-containing catalysts for hydroconversion of furfural","authors":"S. Selishcheva, A. A. Sumina, O. Bulavchenko, V. Yakovlev","doi":"10.18412/1816-0387-2023-4-34-44","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-4-34-44","url":null,"abstract":"Highly loaded copper-containing catalysts synthesized by different methods (sol-gel, alloying and coprecipitation) were studied in hydroconversion of furfural in a batch reactor at a hydrogen pressure 5.0 MPA and temperature 100 °С. The reduction temperature and phase composition of the catalysts were determined using physicochemical methods. The highest activity in the process under consideration was observed for the coprecipitated copper-alumina catalyst, which at 100–130 °С allows obtaining furfuryl alcohol with 100 % selectivity; in addition, 2-methylfuran can be produced in the presence of this catalyst with the yield of 65 % at 200 °С. The phase composition of the catalyst reduced at a chosen temperature and the catalyst after the reaction was determined.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79045573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.18412/1816-0387-2023-3-6-12
I. K. Allaguzin, O. Travkina, B. Kutepov, D. Sabirov
The paper explores the possibility of using KZhV, MP KAH, KCh-2 and KR-2 kaolins produced in Russia as a temporary binder for the production of granulated zeolite NаX, which has high crystallinity and phase purity and a hierarchical pore structure. This zeolite serves as the adsorbent for efficient dehydration of natural and casing-head gases and their cleaning to remove H2S. It was found that KZhV and MP KAH kaolins do not require additional treatments for the production of the indicated adsorbent, whereas KCh-2 and KR-2 kaolins should be additionally dispersed.
{"title":"The production of zeolite-containing adsorbents using various kaolins for efficient dehydration and cleaning of natural gas","authors":"I. K. Allaguzin, O. Travkina, B. Kutepov, D. Sabirov","doi":"10.18412/1816-0387-2023-3-6-12","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-3-6-12","url":null,"abstract":"The paper explores the possibility of using KZhV, MP KAH, KCh-2 and KR-2 kaolins produced in Russia as a temporary binder for the production of granulated zeolite NаX, which has high crystallinity and phase purity and a hierarchical pore structure. This zeolite serves as the adsorbent for efficient dehydration of natural and casing-head gases and their cleaning to remove H2S. It was found that KZhV and MP KAH kaolins do not require additional treatments for the production of the indicated adsorbent, whereas KCh-2 and KR-2 kaolins should be additionally dispersed.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85287857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.18412/1816-0387-2023-3-24-31
A. Stashenko, T. Batova, T. Obukhova, N. Kolesnichenko
In a slurry reactor, the formation of compaction products on Mg/HZSM-5 catalysts, irrespective of the SiO2 /Al2O3 molar ratio in the zeolite, proceeds predominantly on strong acidic sites. The composition of compaction products (mostly trimethyl- and tetramethylbenzenes) virtually does not change with a growth of the molar ratio; however, their amount decreases, which is related to a growth of the mesopore volume with an increase in the SiO2 /Al2O3 ratio. This leads to a decrease in diffusion limitations and contribution of secondary reactions and enhances the removal of coke precursors from the zeolite surface, thus promoting the catalyst activity (the conversion of DME increases twofold). The composition of reaction products changes only slightly with a growth of the SiO2 /Al2O3 molar ratio, the total selectivity to lower olefins is ca. 70 wt.%. A rapid loss of the Mg/HZSM-5 activity with extending the operation time in a slurry reactor is caused not by coking, but rather by «clogging» of the catalyst with decomposition products of the dispersion medium (polydimethylsiloxane).
{"title":"Features of the deactivation of Mg/HZSM-5 catalysts for the synthesis of lower olefins from dimethyl ether in a slurry reactor","authors":"A. Stashenko, T. Batova, T. Obukhova, N. Kolesnichenko","doi":"10.18412/1816-0387-2023-3-24-31","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-3-24-31","url":null,"abstract":"In a slurry reactor, the formation of compaction products on Mg/HZSM-5 catalysts, irrespective of the SiO2 /Al2O3 molar ratio in the zeolite, proceeds predominantly on strong acidic sites. The composition of compaction products (mostly trimethyl- and tetramethylbenzenes) virtually does not change with a growth of the molar ratio; however, their amount decreases, which is related to a growth of the mesopore volume with an increase in the SiO2 /Al2O3 ratio. This leads to a decrease in diffusion limitations and contribution of secondary reactions and enhances the removal of coke precursors from the zeolite surface, thus promoting the catalyst activity (the conversion of DME increases twofold). The composition of reaction products changes only slightly with a growth of the SiO2 /Al2O3 molar ratio, the total selectivity to lower olefins is ca. 70 wt.%. A rapid loss of the Mg/HZSM-5 activity with extending the operation time in a slurry reactor is caused not by coking, but rather by «clogging» of the catalyst with decomposition products of the dispersion medium (polydimethylsiloxane).","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82194480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.18412/1816-0387-2023-3-52-65
K. N. Sorokina, Y. V. Samoylova, V. N. Parmon
The review considers the main approaches to thermochemical and catalytic conversion of microalgae biomass (hydrothermal liquefaction, gasification, transesterification and pyrolysis) for the production of biofuels. Particular attention is paid to the key conditions determining the yield of reaction products with the use of catalysts for the production of bio-oil as well as to the approaches to bio-oil treatment. It is shown that the use of bifunctional acid-base catalysts is most appropriate for transesterification processes. Gasification and pyrolysis processes are applied more rarely because the first process is accompanied by the formation of СО2, while the pyrolysis leads to the formation of a large amount of oxidized compounds, which deteriorate the quality of bio-oil.
{"title":"The use of microalgae biomass for the production of marketable products. Part 3. The manufacture of motor fuels from microalgae biomass using catalytic approaches","authors":"K. N. Sorokina, Y. V. Samoylova, V. N. Parmon","doi":"10.18412/1816-0387-2023-3-52-65","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-3-52-65","url":null,"abstract":"The review considers the main approaches to thermochemical and catalytic conversion of microalgae biomass (hydrothermal liquefaction, gasification, transesterification and pyrolysis) for the production of biofuels. Particular attention is paid to the key conditions determining the yield of reaction products with the use of catalysts for the production of bio-oil as well as to the approaches to bio-oil treatment. It is shown that the use of bifunctional acid-base catalysts is most appropriate for transesterification processes. Gasification and pyrolysis processes are applied more rarely because the first process is accompanied by the formation of СО2, while the pyrolysis leads to the formation of a large amount of oxidized compounds, which deteriorate the quality of bio-oil.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88711834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.18412/1816-0387-2023-3-43-51
Y. V. Samoylova, K. N. Sorokina, V. N. Parmon
The goal of the paper is the review of literature on the processing of microalgae biomass using advanced chemical and bioengineering approaches into various types of biofuels (methyl esters of fatty acids, ethanol, butanol, hydrogen) and marketable chemical products, particularly polyunsaturated fatty acids, pigments, and proteins. The paper deals with the manufacture of products using different strategies that are applied for the development of modern approaches to complex bioprocessing of microalgae biomass.
{"title":"The use of microalgae biomass for the production of marketable products. Part 2. Modern approaches to complex processing of microalgae biomass","authors":"Y. V. Samoylova, K. N. Sorokina, V. N. Parmon","doi":"10.18412/1816-0387-2023-3-43-51","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-3-43-51","url":null,"abstract":"The goal of the paper is the review of literature on the processing of microalgae biomass using advanced chemical and bioengineering approaches into various types of biofuels (methyl esters of fatty acids, ethanol, butanol, hydrogen) and marketable chemical products, particularly polyunsaturated fatty acids, pigments, and proteins. The paper deals with the manufacture of products using different strategies that are applied for the development of modern approaches to complex bioprocessing of microalgae biomass.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81942045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.18412/1816-0387-2023-3-32-42
R. Yakovenko, T. V. Krasnyakova, A. V. Dulnev, A. Saliev, M. A. Shilov, A. V. Volik, A. Savost’yanov, S. Mitchenko
Import substitution industrialization makes it necessary to adapt domestic industrial catalysts for the application in important technological processes, particularly the environmentally friendly production of hydrogen, which is not accompanied by the emission of СОх and NОх. Ammonia is considered as the most promising medium for hydrogen storage due to its high density with respect to hydrogen as well as convenient storage and transportation. The paper demonstrates the possibility of using industrial domestic catalysts NIAP-03-01, NIAP-07-01, NIAP-06-06 and the developed by our team Со-Al2O3 /SiO2 in the reaction of ammonia dissociation. The conversion and the hydrogen production rate increase in the series NIAP-06-06 – NIAP-03-01 – NIAP-07-01 – Со-Al2O3 /SiO2. At 550 °С and OSG 3000 h–1 the conversion of ammonia on Со-Al2O3 /SiO2 is close to 100 %. Effective activation energies of all the catalysts are comparable with the literature data for the ammonia decomposition reaction; so these catalysts are potentially applicable at moderate temperatures.
{"title":"Estimating the efficiency of some industrial domestic catalysts in ammonia decomposition","authors":"R. Yakovenko, T. V. Krasnyakova, A. V. Dulnev, A. Saliev, M. A. Shilov, A. V. Volik, A. Savost’yanov, S. Mitchenko","doi":"10.18412/1816-0387-2023-3-32-42","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-3-32-42","url":null,"abstract":"Import substitution industrialization makes it necessary to adapt domestic industrial catalysts for the application in important technological processes, particularly the environmentally friendly production of hydrogen, which is not accompanied by the emission of СОх and NОх. Ammonia is considered as the most promising medium for hydrogen storage due to its high density with respect to hydrogen as well as convenient storage and transportation. The paper demonstrates the possibility of using industrial domestic catalysts NIAP-03-01, NIAP-07-01, NIAP-06-06 and the developed by our team Со-Al2O3 /SiO2 in the reaction of ammonia dissociation. The conversion and the hydrogen production rate increase in the series NIAP-06-06 – NIAP-03-01 – NIAP-07-01 – Со-Al2O3 /SiO2. At 550 °С and OSG 3000 h–1 the conversion of ammonia on Со-Al2O3 /SiO2 is close to 100 %. Effective activation energies of all the catalysts are comparable with the literature data for the ammonia decomposition reaction; so these catalysts are potentially applicable at moderate temperatures.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87549155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.18412/1816-0387-2023-3-66-80
Y. V. Samoylova, K. N. Sorokina, V. N. Parmon
This is a review of the literature devoted to the production of microalgae biomass and its processing into marketable chemical products using advanced bioengineering approaches. The paper considers approaches to the manufacture of biofuels – biodiesel fuel, ethanol and hydrogen – from microalgae. Methods of biomass pretreatment, recovery of metabolites and their processing into biofuels are discussed.
{"title":"The use of microalgae biomass for the production of marketable products. Part 4. The manufacture of biofuels from microalgae using bioengineering approaches","authors":"Y. V. Samoylova, K. N. Sorokina, V. N. Parmon","doi":"10.18412/1816-0387-2023-3-66-80","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-3-66-80","url":null,"abstract":"This is a review of the literature devoted to the production of microalgae biomass and its processing into marketable chemical products using advanced bioengineering approaches. The paper considers approaches to the manufacture of biofuels – biodiesel fuel, ethanol and hydrogen – from microalgae. Methods of biomass pretreatment, recovery of metabolites and their processing into biofuels are discussed.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85575749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.18412/1816-0387-2023-3-13-23
O. Kovalenko, I. Simentsova, V. N. Panchenko, M. Timofeeva
In order to establish the main factors that make it possible to regulate the activity and selectivity of the solketal synthesis process from glycerol and acetone, the acidic and catalytic properties of mordenite (MOR, SiO2 /Al2O3 = 29.2) and faujasite (FAU, SiO2 /Al2O3 = 14.9, 97 and 810) were studied. The reaction was investigated at 25 and 50°C, at acetone/glycerol molar ratio of 2.5. In the presence of zeolites, solketal is the main product with a selectivity of 88.1–94.7 %. It has been shown that the main factors determining the conversion of glycerol and the yield of solketal are the availability of reagents to active sites, the number and strength of acid sites, as well as their resistance to the poisoning effect of water molecules formed during the reaction.
{"title":"Influence of the structure and acidity of zeolites on the synthesis of solketal from glycerol and acetone","authors":"O. Kovalenko, I. Simentsova, V. N. Panchenko, M. Timofeeva","doi":"10.18412/1816-0387-2023-3-13-23","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-3-13-23","url":null,"abstract":"In order to establish the main factors that make it possible to regulate the activity and selectivity of the solketal synthesis process from glycerol and acetone, the acidic and catalytic properties of mordenite (MOR, SiO2 /Al2O3 = 29.2) and faujasite (FAU, SiO2 /Al2O3 = 14.9, 97 and 810) were studied. The reaction was investigated at 25 and 50°C, at acetone/glycerol molar ratio of 2.5. In the presence of zeolites, solketal is the main product with a selectivity of 88.1–94.7 %. It has been shown that the main factors determining the conversion of glycerol and the yield of solketal are the availability of reagents to active sites, the number and strength of acid sites, as well as their resistance to the poisoning effect of water molecules formed during the reaction.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87342208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.18412/1816-0387-2023-2-58-65
V. B. Kharitontsev, E. A. Tissen, E. S. Matveenko, Ya. A. Mikhailov, N. Tretyakov, A. Zagoruiko, A. Elyshev
The paper is devoted to investigation of the catalytic pyrolysis of high-density polyethylene (PE) in the presence of HBEA, HZSM-5 and HFER catalysts and natural clay. Catalytic pyrolysis of plastic materials is a promising method for treatment of secondary raw materials because it allows converting polymers into chemical compounds, which further serve as a source for chemical industry. Physicochemical parameters of the catalysts were estimated using various methods: IR Fourier spectroscopy, X-ray diffraction analysis, physical adsorption of N2, thermogravimetric analysis, and pyrolytic gas chromatography. Temperature dependences of PE destruction were obtained as well as the dependence of chemical composition of the catalytic pyrolysis products on the catalyst type. Two main factors were shown to determine the efficiency of cracking and the qualitative composition of products – structural and acidic parameters of the catalyst. The presence of Broensted acid sites in zeolites promoted the cracking and aromatization reactions. The possibility of using the clay sample for thermal decomposition of PE was estimated.
{"title":"Estimating the efficiency of catalysts for catalytic pyrolysis of polyethylene","authors":"V. B. Kharitontsev, E. A. Tissen, E. S. Matveenko, Ya. A. Mikhailov, N. Tretyakov, A. Zagoruiko, A. Elyshev","doi":"10.18412/1816-0387-2023-2-58-65","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-2-58-65","url":null,"abstract":"The paper is devoted to investigation of the catalytic pyrolysis of high-density polyethylene (PE) in the presence of HBEA, HZSM-5 and HFER catalysts and natural clay. Catalytic pyrolysis of plastic materials is a promising method for treatment of secondary raw materials because it allows converting polymers into chemical compounds, which further serve as a source for chemical industry. Physicochemical parameters of the catalysts were estimated using various methods: IR Fourier spectroscopy, X-ray diffraction analysis, physical adsorption of N2, thermogravimetric analysis, and pyrolytic gas chromatography. Temperature dependences of PE destruction were obtained as well as the dependence of chemical composition of the catalytic pyrolysis products on the catalyst type. Two main factors were shown to determine the efficiency of cracking and the qualitative composition of products – structural and acidic parameters of the catalyst. The presence of Broensted acid sites in zeolites promoted the cracking and aromatization reactions. The possibility of using the clay sample for thermal decomposition of PE was estimated.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80666270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.18412/1816-0387-2023-2-66-72
N. Alekseeva, V. V. Eremina, S. Sysolyatin, I. Shchurova
A study on the Pd-catalyzed hydrodebromination of 2,3,4,5-tetrabromothiophene (1) to 3,4-dibromothiophene (2) is reported. The effect of the solvent nature, main agent, temperature and concentration of 1 on the yield of 2 was studied. Optimal conditions of the process were found: a 5 % Pd/Sibunit catalyst constituting 10 % of the substrate weight, a temperature of 80 °С, a pressure of 0.7 MPa, dimethyl formamide with the addition of triethylamine as the main agent in the amount of 2.2 equiv per 1 equiv of the initial substance 1, and the yield of 2 constituting up to 97.5 %. It was shown that the catalyst could be reused with the preservation of the high yield of 2. In comparison with the conventional method of chemical reduction of 1 under the action of zinc in acetic acid, the novel method ensures high output and low wastes.
{"title":"Selective catalytic hydrodebromination of 2,3,4,5-tetrabromothiophene with hydrogen on a palladium catalyst","authors":"N. Alekseeva, V. V. Eremina, S. Sysolyatin, I. Shchurova","doi":"10.18412/1816-0387-2023-2-66-72","DOIUrl":"https://doi.org/10.18412/1816-0387-2023-2-66-72","url":null,"abstract":"A study on the Pd-catalyzed hydrodebromination of 2,3,4,5-tetrabromothiophene (1) to 3,4-dibromothiophene (2) is reported. The effect of the solvent nature, main agent, temperature and concentration of 1 on the yield of 2 was studied. Optimal conditions of the process were found: a 5 % Pd/Sibunit catalyst constituting 10 % of the substrate weight, a temperature of 80 °С, a pressure of 0.7 MPa, dimethyl formamide with the addition of triethylamine as the main agent in the amount of 2.2 equiv per 1 equiv of the initial substance 1, and the yield of 2 constituting up to 97.5 %. It was shown that the catalyst could be reused with the preservation of the high yield of 2. In comparison with the conventional method of chemical reduction of 1 under the action of zinc in acetic acid, the novel method ensures high output and low wastes.","PeriodicalId":17783,"journal":{"name":"Kataliz v promyshlennosti","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89849230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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