Project Title2013Recently, Over 0.2 million tons per year (TPY)
「Project Title2013Recently, Over 0.2 million tons per year (TPY) 」於資料集「EPQSummary_ChemicalSubstanceManagement」由單位「行政院環境保護署」的陳先生所提供，聯繫電話是02-2311-7722#2386，最近更新時間為：2023-07-30 01:01:48。 欄位Project Title的內容是 ， 欄位Project Subject的內容是Recently, Over 0.2 million tons per year (TPY) of flyash hazardous wastes were produced from steel industries in Taiwan having high risk for enviroment or human beings. In stainless stell/carbon steel manufacturing plants, the NiFe2O4/ZnFe2O4 are major materials and can be easily speparated/purified using magnetic method or ball mill unit. Carbon dioxide is the main greenhouse gas of 50~60% with global warming potential (GWP) and plays a role in the greenhouse effect especially for the CO2 emission from steel companies, powder generation plants, and petrochemical industries. Experimentally, NiFe2O4/ZnFe2O4 catalysts were speparated from flyashes with the efficiency of 32-40% and further purified to obtain nanocatalysts with the efficiency of 15-20% using magnetic separation or ball mill methods. The optimal synthetic conditions of NiFe2O4/ZnFe2O4 catalysts were pH = 8.5 and stirring rate of 1,250 rpm at 453 K for 4 h using hydrothermal method. The XRD patterns indicated the NiFe2O4/ZnFe2O4 catalysts are spinel structure. Based on FE-SEM and TEM micrographs, the particle size ranged of 30-50 nm of NiFe2O4/ZnFe2O4 nanocatalysts were found. Decomposition of CO2 into carbon and oxygen was carried out within few minutes when it comes into contact with oxygen deficient nanocatalysts through incorporation of oxygen into catalysts. The pre-edge XANES spectra of Fe species in nanocatalysts exhibits an absorbance feature at 7,115 eV for the 1s to 3d transition which is forbidden by the selection rule in case of perfect octahedral symmetry. The EXAFS data showed that the nanocatalysts had two central Fe atoms coordinated by primarily Fe–O with bond distance and coordination number of 1.93 Å/2.01 Å and 3.38/3.88 for Ni/Zn nanoferrites, respectively. Based on 72 h durability test of ZnFe2O4/NiFe2O4 nanocatalysts, the decay of 40% was observed. Proposed deactivation mechanisms of the nanocatalysts may include: particle size increasing, carbon deposition/sintering or ZnCO3/NiCO3 deposition on the surface of nanocatalysts. Based on the theoretical calculation, the energy efficiency of the route from CO2 to CH4 is higher compared with the one from C or H2 combustion directly. The in-situ complicated offgases contains 15-20% CO2, it needs to be purified by pressure swing adsorption (PSA) before decomposition reaction in fixed-bed or fluidized-bed catalytic reactors at 300-350℃ and 1 atm. When CO2 contacts with oxygen deficient ferrites, decomposition of CO2 occurs by the incorporation of oxygen anions in the vacancies in the oxygen deficient ferrite thereby restoring the ferrite to stoichiometry at 1 atm and 573-673 K. At the same time, electrons are donated from the oxygen deficient ferrite to produce carbon or carbon monoxide. Next, the deposited carbon on the surface converts into methane (methanation) upon treatment with H2 (hydrogenation) while regenerating used ferrite to oxygen deficient ferrite. Decomposition of CO2, moreover, recovery of valuable methane using heat energy of offgas produced from steel companies, powder generation plants, and petrochemical industries is an appealing alternative for energy recovery. ， 欄位Project Year的內容是2013 ， 欄位Organizer的內容是Office of Sustainable Development ， 欄位Executive Unit的內容是元智大學 ， 欄位Reporting download URL的內容是https://epq.epa.gov.tw/ProjectDoc/FileDownload?fid=57074&proj_id=1024718063&doc_kind=1 ， 欄位Publish Date的內容是20140201 。
Project Title
Project Subject
Recently, Over 0.2 million tons per year (TPY) of flyash hazardous wastes were produced from steel industries in Taiwan having high risk for enviroment or human beings. In stainless stell/carbon steel manufacturing plants, the NiFe2O4/ZnFe2O4 are major materials and can be easily speparated/purified using magnetic method or ball mill unit. Carbon dioxide is the main greenhouse gas of 50~60% with global warming potential (GWP) and plays a role in the greenhouse effect especially for the CO2 emission from steel companies, powder generation plants, and petrochemical industries. Experimentally, NiFe2O4/ZnFe2O4 catalysts were speparated from flyashes with the efficiency of 32-40% and further purified to obtain nanocatalysts with the efficiency of 15-20% using magnetic separation or ball mill methods. The optimal synthetic conditions of NiFe2O4/ZnFe2O4 catalysts were pH = 8.5 and stirring rate of 1,250 rpm at 453 K for 4 h using hydrothermal method. The XRD patterns indicated the NiFe2O4/ZnFe2O4 catalysts are spinel structure. Based on FE-SEM and TEM micrographs, the particle size ranged of 30-50 nm of NiFe2O4/ZnFe2O4 nanocatalysts were found. Decomposition of CO2 into carbon and oxygen was carried out within few minutes when it comes into contact with oxygen deficient nanocatalysts through incorporation of oxygen into catalysts. The pre-edge XANES spectra of Fe species in nanocatalysts exhibits an absorbance feature at 7,115 eV for the 1s to 3d transition which is forbidden by the selection rule in case of perfect octahedral symmetry. The EXAFS data showed that the nanocatalysts had two central Fe atoms coordinated by primarily Fe–O with bond distance and coordination number of 1.93 Å/2.01 Å and 3.38/3.88 for Ni/Zn nanoferrites, respectively. Based on 72 h durability test of ZnFe2O4/NiFe2O4 nanocatalysts, the decay of 40% was observed. Proposed deactivation mechanisms of the nanocatalysts may include: particle size increasing, carbon deposition/sintering or ZnCO3/NiCO3 deposition on the surface of nanocatalysts. Based on the theoretical calculation, the energy efficiency of the route from CO2 to CH4 is higher compared with the one from C or H2 combustion directly. The in-situ complicated offgases contains 15-20% CO2, it needs to be purified by pressure swing adsorption (PSA) before decomposition reaction in fixed-bed or fluidized-bed catalytic reactors at 300-350℃ and 1 atm. When CO2 contacts with oxygen deficient ferrites, decomposition of CO2 occurs by the incorporation of oxygen anions in the vacancies in the oxygen deficient ferrite thereby restoring the ferrite to stoichiometry at 1 atm and 573-673 K. At the same time, electrons are donated from the oxygen deficient ferrite to produce carbon or carbon monoxide. Next, the deposited carbon on the surface converts into methane (methanation) upon treatment with H2 (hydrogenation) while regenerating used ferrite to oxygen deficient ferrite. Decomposition of CO2, moreover, recovery of valuable methane using heat energy of offgas produced from steel companies, powder generation plants, and petrochemical industries is an appealing alternative for energy recovery.
Project Year
2013
Organizer
Office of Sustainable Development
Executive Unit
元智大學
Reporting download URL
https://epq.epa.gov.tw/ProjectDoc/FileDownload?fid=57074&proj_id=1024718063&doc_kind=1
Publish Date
20140201
「Project Title2013Recently, Over 0.2 million tons per year (TPY) 」所屬的資料集：「EPQSummary_ChemicalSubstanceManagement」的其他資料
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