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Synthesis and Application of Metal Doped Silica Particles for Adsorptive Desulphurization of Fuels
Bushra Jabeen,Uzaira Rafique 대한환경공학회 2014 Environmental Engineering Research Vol.19 No.3
Petroleum a vital commodity affecting every aspect of 21st century. Toxicity and adverse effects of sulphur as catalyst in petroleum products is of great concern required development of techniques for desulphurization in compliance with the International standards. Installation of desulphurizing units costs over $200 million per unit placing economic burden on developing countries like Pakistan. Present study analysis of commercial fuels (station petrol and jet fuel JP8) on gas chromatography-mass spectrometry (GC-MS) identified sulphur concentration of 19.94 mg/L and 21.75 mg/L, respectively. This scenario urged the researcher to attempt synthesis of material that is likely to offer good adsorption capacity for sulphur. Following protocol of sol-gel method, transition metals (Ni, Cu, Zn) solution is gelated with tetraethoxysilane (TEOS; silica precursor) using glycerol. Fourier transform infrared spectroscopy (FTIR) spectra revealed bonding of Zn-O, Cu-O, and Ni-O by stretching vibrations at 468 cm-1, 617 cm-1, and 468 cm-1, respectively. Thiophene and Benzothiophene mixed in n-heptane and benzene (4:1) for preparation of Model Fuels I and II, respectively. Each of silica based metal was applied as adsorbent in batch mode to assess the removal efficiency. Results demonstrated optimal desulphurization of more than 90% following efficacy order as Si-Ni > Si-Zn > Si-Cu based adsorbents. Proposed multilayered (Freundlich) adsorption mechanism follows π-complexation with pseudo secnd order kinetics.
A Case Study of Desulphurization by Limestone Adsorbent in an Industrial CFBC Boiler
Park, Young-Goo,Kim, Seung-Ho,Jo, Young-Min Korean Society for Atmospheric Environment 2005 한국대기환경학회지 Vol.21 No.E2
Domestic anthracite contains a large amount of fine particles, which causes to fire the back side of the boiler and to form the clinker deteriorating the combustion efficiency. At this time, the fine limestone adsorbents for a desulphurization agent may be used to facilitate an aggravation of the boiler, so that fine mode of limestone (<0.1mm) has been used no more than $25\%$ in local power stations of Korea. The present test carried out with an in-situ boiler, however, showed that higher content $(up\;to\;50\%)$ of fine limestone particles did not entail any mal-function. In addition, the desulphurization was found to be as good as the old mode of limestone adsorbents.
김예빈,곽인섭,장준영,신혜리,이시훈 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Limestone is generally used as a desulfurizing agent material in circulating fluidized bed (CFB) boilers. In order to study in-situ desulfurization characteristics of domestic limestones in the operation condition of a oxy-fuel CFB, 4 different limestone samples were used to analyze the effect of CO2 on calcination and desulphurization behavior in a thermogravimetric analyzer (TGA, N-1000). The limestones used in these experiments is commercially used in domestic CFB boilers. Calcination and decalcination phenomena with different CO2 partial pressures were investigated at 850-900 ℃ conditions. Also, the effect of particle size on calcination and desulphurization was studied.
A study of the replacement of desulphurization slag for sand to ready-mixed soil materials (RMSM)
Yi-Fang Shiha,Shih-Shong Tseng,Her-Yung Wang,Chih-Ting Wei 사단법인 한국계산역학회 2016 Computers and Concrete, An International Journal Vol.17 No.3
After the industrial of steelmaking by-products are processed properly, they can be used in civil engineering, not only as a substitute for natural resources and to reduce costs, but also to provide environmental protection. This study used different amounts (10%, 20%, 30%, 40%,and 50%) of desulphurization slag to replace natural fine aggregates in ready-mixed soil materials, and tested the physical and fresh properties (slump, slump flow, tube flow, initial setting time, and bleeding) and hardened properties (compressive strength, ball drop, ultrasonic pulse velocity) of the materials. The variations between the performances of the materials with different mix proportions were discussed. When desulphurization slag is used in RMSM, the workability can be enhanced obviously significantly. When the replacement of desulphurization slag is 50%, the slump flow is increased by 110mm compared with the control group, and the initial setting time increases as the replacement increases, because of bleeding. When the replacement is 10% and 20%, the compressive strength at various ages is higher than that of the control group. When the replacement is 10%, the compressive strength at 7 days is higher than that of the control group by 60%, and the ultrasonic pulse velocity is proportional to the compressive strength, which increases with age and decrease as the replacement increases. An appropriate replacement can effectively accelerate construction, and allow projects to be finished ahead of schedule; therefore, an appropriate replacement, is applicable for ready-mixed soil materials.
Chandra Sekhar Gahan,Dong Jin Kim,Chandrika Akilan,Seo-Yun Choi,Byoung Gon Kim 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
Shake flask studies on microbial desulfurization of three different coal samples (Indonesian lignite, Chinese lignite and Korean anthracite) were performed to optimize the best suitable growth medium. Among the three different growth mediums (basal salt medium, basal salt medium supplemented with 9 g/L Fe and basal salt medium supplemented with 2.5% S0) tested, the basal salt medium was found to be the best, considering process dynamics and economical factors. The extent of pyrite oxidation was highest with 95% in the experiments with Korean anthracite in basal salt medium supplemented with 9 g/L Fe, while the lowest pyrite oxidation of 70-71% was observed in the experiments with Indonesian and Chinese Lignite’s in only basal salt medium. The microbial sulfur removal in the experiments with basal salt medium supplemented with 9 g/L Fe for all the three coal samples was between 94-97%, while the experiments on basal salt medium supplemented with 2.5% S0 for all the coal samples were relatively much lower ranging between 27-48%. However, the overall study resulted with promising directions for further scaling up of microbial desulphurization in a best growth medium devoid of iron and sulfur supplement.
C.N.C. Hitam,A.A. Jalil,A.A. Abdulrasheed 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.74 No.-
Photocatalytic oxidative desulphurization (PODS) has become an eye-catching green technology for fueloil treatment because of its mild reaction conditions. The present review consists of the advantages anddisadvantages of PODS catalysts and the characteristics of excellent PODS catalysts. Explicitly, detailedstrategies for obtaining promising performance including the use of support materials, doping of metalelements, coupling with other suitable semiconductors, and the influence of other important criteria inPODS are deliberated tofinalize a mechanistic study of an excellent PODS method. Besides, the futureprospects and challenges are also included to highlight the unexplored potential of PODS criteria.
해수 탈황 설비의 폭기 기포 크기에 따른 해수 재생 성능 해석
송동근(Dong-Keun Song),홍원석(Won-Seok Hong),신완호(Wan-Ho Shin),김한석(Han-Seok Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Seawater flue gas desulphurization (SWFGD) is a promising and efficient process to remove sulfur dioxide in flue gases in power plants and industries. In SWFGD process, the aeration process is essential in seawater recovery, which realizes the need of oxygen transfer to improve the quality of seawater effluent. In recovery of seawater in aeration process, various aerators are used and the size of bubble depends on the generation mechanism of the aerators. The performance of seawater recovery is highly dependent on the bubble sizes. In this study, the effect of the bubble size in aeration process for recovery of seawater used for desulfurization in the SWFGD has been investigated analytically. For dynamics modeling of aeration process, mass transfer of oxygen at the gas-liquid interface and kinetics of hydration of CO2, oxidation of Sulfite, and oxidation rate in seawater are incorporated.
Tianjin Li,Yuqun Zhuo,Junyong Lei,Xuchang Xu 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.6
potential of the sorbent-catalysts prepared from three low cost materials, i.e., the lime, fly ash andsome industrial waste material containing iron oxide, have been investigated for simultaneous removal of SO2 and NOxfrom flue gas in the temperature range 700-850oC. NH3 was chosen as the reducing agent for NO reduction in thisstudy. Experimental results showed that SO2 and NO could be simultaneously removed efficiently in the absence ofO2 at the temperature window of 700-800oC. The effect of product layer generated from SO2 removal on NO removal2, which was attributed to the partial oxidationof NH3 to NO over the sorbent-catalysts in the presence of oxygen. Neither NO2 nor N2O by-product was detected bothin the absence and presence of O2. Three routes were suggested to overcome the negative effect of O2.