Search or add a thesis

Advanced Search (Beta)
Home > Catalytic Oxidation and Degradation of Organic Compounds Using Supported Transition Metals/Metal Oxides.

Catalytic Oxidation and Degradation of Organic Compounds Using Supported Transition Metals/Metal Oxides.

Thesis Info

Access Option

External Link

Author

Siddique, Mohsin

Program

PhD

Institute

University of Peshawar

City

Peshawar

Province

KPK

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Chemistry

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2700/1/2681S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725665346

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


0.1 wt % Palladium/ZrO 2, Manganese oxide and cobalt oxide were synthesized in our laboratory. Zirconia was prepared in the laboratory by precipitation of zirconyl chloride with ammonium hydroxide. Pd/ZrO 2 was prepared by incipient wetness impregnation technique. Cobalt oxide was prepared by solid state mixing of cobalt nitrate and ammonium bicarbonate in an agate mortar at room temperature. Manganese oxide was also prepared by mechanochemical addition of potassium permanganate and Ammonium bicarbonate in a molar ratio of 2:3 respectively. The prepared catalysts were characterized by several physical/analytical methods that include nitrogen adsorption studies (Surface area and Pore Size Analysis), X-Ray Diffractometery, Fourier Transform Infra Red spectroscopy, particle size and Scanning Electron Microscope analysis. Pd/ZrO 2 was tested for the solvent free oxidation of benzyl alcohol and Toluene respectively. The reactions were carried out in liquid phase under mild conditions of temperature and pressure. Molecular oxygen was used as oxidant. The oxidation of BzOH was > 70 % selective towards benzaldehyde formation with a TOF>6000 per hour. Kinetic study showed that Langmuir Hinshelwood (L-H) mechanism was found to be followed when the experimental data was applied to the L-H equation. The oxidation of toluene was more selective towards benzyl alcohol formation in lower reaction temperature regime; however as the reaction temperature was increased the reaction became more selective towards benzoic acid. The main oxidation products were benzyl alcohol, benzaldehyde and benzoic acid however the main product was benzoic acid. Manganese oxide was prepared by solid state mechanochemical addition of potassium permanganate and Ammonium bicarbonate. The synthesized manganese oxide powder was employed for the oxidation of benzyl alcohol in liquid phase using n-heptane as a solvent. The reaction was found to very fast and 100% selective towards the formation of benzaldehyde atxv 363K and atmospheric pressure of oxygen. The reactions were performed at very low reaction temperatures i.e. 323-363K. Cobalt oxide was prepared by was prepared by solid state mechanochemical mixing of cobalt nitrate and ammonium bicarbonate. The synthesized catalyst was employed for the catalytic degradation of two different dyes i.e. Methylene Blue and Congo red. The catalyst was found to be extremely efficient towards the degradation of both these dyes. Both the organic dyes were successfully destructed in a very quick reaction time i.e. 10 minutes. Reactions were carried out in atmospheric conditions and room temperature. Various parameters affecting the degradation performance of the dye were examined such as time, catalyst loading, temperature, initial dye concentrations, speed of agitation and effect of partial pressure of oxygen. The removal percentage of dyes increased with increasing mass of Cobalt oxide up to an optimum mass but decreased with increasing initial concentrations. All the catalysts were heterogeneous in nature, which could be separated easily by simple filtration.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

دساں کی حساب، حساب دے وچ

دساں کی حساب، حساب دے وچ
دکھ لکھیا پیا کتاب دے وچ
اوسے نور دا مڈھ ظہور ہویا
جیہڑا چمکدا اے آفتاب دے وچ
برہوں ہجردے وچ میں گئی بھنی
سیخاں ہوندیاں جیویں کباب دے وچ
ہووے غلطی جے کوئی معاف کرنا
خط لکھیا گیا شتاب دے وچ
اکھیں تکدیاں تکدیاں رہ گئیاں
نشہ کیہڑا سی اوس شراب دے وچ
جنگاں واسطے پانی دے ہونئیاں نے
پانی سُکدا پیا چناب دے وچ
کسے کامل ولی دی کر محفل
کی لبھنا ایں خانہ خراب دے وچ
کیہڑے حیف حنیف دے وچ رُجّھوں
ایہو کجھ ہئی عشق دے باب دے وچ

The Problems Faced by a Translator

Translation is a separate genre and should be treated as one with its specie set of issues, nuances and problem. The Islamic scholars face a peculiar set of problems as their root-medium is Arabic and it is from Arabic to the other languages--- that conversion words a translators' main job are hard to find. The following article is an effort to highlight the set of problems and issues faced by Muslim non-Arab translators while dealing with the medium of Arabic language.

Need of Guidance at Secondary School Level

Laboratory tests were conducted to determine the acute toxicity of Al, As, Ba, Cr and HMM, in terms of 96-hr LC50 and lethal concentrations, to three age groups viz. 60-, 120- and 240-day of Catla catla, Labeo rohita and Cirrhina mrigala at constant water temperature (30oC), pH (7.50) and total hardness (300 mgL-1). The growth performance, condition factor, feed intake and feed conversion efficiency of 240-day three fish species viz. Catla catla, Labeo rohita and Cirrhina mrigala under chronic (1/3 of LC50)exposures of Al, As, Ba, Cr and their mixture for 90 days were also determined. The fish were fed with feed (34% DP and 3.00 Kcalg-1 DE) to satiation daily. At termination of each trial, the fish were dissected and their organs viz. bones, gills, gut, intestine, kidney, liver, scales, skin, muscle and fats isolated for the determination of metal concentrations. The toxicity of aluminium, arsenic, barium and chromium to the three fish species viz. Catla catla, Labeo rohita and Cirrhina mrigala fluctuated significantly as a function of their diverse physico-chemical characteristics. The 60-day all the three fish species showed significantly higher sensitivity to all metals and their mixture while 240-day fish were significantly least sensitive. Catla catla were significantly more sensitivity to arsenic, followed by the sensitivity caused by metal mixture, chromium, aluminium and barium with the mean 96-hr LC50 values of 7.96 ± 1.40, 27.35 ± 9.17, 77.01 ± 22.47, 81.68 ± 28.54 and 112.45 ± 31.35 mgL-1, respectively. Labeo rohita were significantly least sensitive against barium (126.12 ± 22.76 mgL-1) while Cirrhina mrigala to aluminium with the mean concentration of 118.36 ± 28.91 mgL-1. Significant variations in the sensitivity of Catla catla, Labeo rohita and Cirrhina mrigala to various metals appeared species specific depending upon the nature of metals, exposure concentration and properties of water viz. water temperature, dissolved oxygen contents and pH. Exposure of aluminium to the fish caused significantly higher mean metal in the fish body, followed by that of barium, chromium and arsenic with statistically significant differences. Fish organs showed significantly variable ability to concentrate metals and therefore liver and kidney exhibited relatively high potentials for metals accumulation during short term (96-hr) acute exposures. All the three control (un-stressed) fish species exhibited significantly better growth due to significantly higher feed intakes than those grown under sub-lethal toxicity of either individual metals or metal mixture. Cirrhina mrigala gained significantly higher weight gains, followed by that of Catla catla and Labeo rohita under metal stress. All the three fish species showed significantly variable responses, in terms of increase in wet weights, fork and total lengths, feed intake and feed conversion ratios, due to chronic sub-lethal exposure to either individual metals viz. Al, As, Ba, Cr and mixture. However, all the three control (un-stressed) fish species exhibited significantly better growth due to significantly higher feed intakes than those grown under sub-lethal toxicity of either individual metals or metal mixture. The exposure of metal mixture (Al + As + Ba + Cr) caused significantly least growth, in terms of mean wet weights, in all the three fish species indicating a metal combination (Al + As + Ba + Cr) to be additive or synergistic in their mode of action in fish body. Among the three fish species, Cirrhina mrigala gained significantly higher weight gains, followed by that of Catla catla and Labeo rohita under metal stress. However, the difference between Catla catla and Labeo rohita for their growth rates was statistically non-significant. Therefore, lesser growth as a result of low feed utilization and feed conversion efficiency in fish, during sub-lethal exposure of metals and metal mixture, exhibited impaired normal 1 physiological functions in fish. Among the individual metals, chromium exposure caused significantly minimal effects on feed conversion efficiency of all the three fish species. The exposure of fish to individual metals viz. aluminium, arsenic, barium and chromium, during 90-day growth trials, caused significantly variable accumulation of these metals in the body organs of three fish species. However, fish liver, kidney and gills accumulated significant amounts of heavy metals. Three fish species also showed significantly variable responses for their tendencies to accumulate metals in their body organs. The exposure of metal mixture (Al + As + Ba + Cr) to all the three fish species caused significant accumulation of all metals in the fish liver, except arsenic in Labeo rohita. However, metal mixture exposure to all the three fish species caused significantly least accumulation of all metals in body fats. Among the three fish species, Cirrhina mrigala showed significantly higher ability to concentrate all the metals in their body organs.