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Showing 1 to 20 of 136 for “"nitric acid"”.
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The absorption of nitrogen dioxide in concentrated nitric acid
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1940.
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Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production
Ammonia oxidation is used in the production of nitric acid. The process is either run at high pressure or low pressure, with the latter requiring larger equipment. Platinum gauze is typically used as a catalyst operating at high temperatures (in the range of 810-940 ᵒC). The platinum based catalyst …
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Heterogeneous Reactions of Nitric Acid and Dinitrogen Pentoxide on Mineral Dust Surfaces: A Knudsen Reactor Study
The heterogeneous reactions of nitric acid and dinitrogen pentoxide with various authentic dust, mineral and clay mineral surfaces has been investigated my means of the Knudsen reactor techique at room temperature. Authentic dust surfaces from the Saharan, the Chinese and the Arizona dust regions …
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Investigation of water vapor effects on the detection of nitric acid vapor with the tungstic acid technique
An automated tungstic acid technique (TAT) has been successfully used to measure gaseous HNO₃ in the presence of water vapor. The TAT is based on the diffusion of gaseous HNO₃ to the interior walls of a tube coated with tungsten VI oxide (WO₃), where it is selectively chemisorbed. The collected …
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On nitric acid and chlorate of potassium as an oxydizing mixture applicable to sulphur, sulphids, chromium, arsenic, organic matters, etc.
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemistry, 1869
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Reactions of cellulose in liquid sulfur dioxide
… of liquid sulfur dioxide either ~~th ruming nitric acid, a mixture of fuming nitric acid and sulfuric acid t a mixture of fuming nitric acid and phosphorus pentoxide, a mixture of fuming nitric acid, phosphorus pentox1de ana chlorine gas, or with nitrogen tetroxide. This is attributed to the …
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Investigation of condensed and early stage gas phase hypergolic reactions
… between monomethylhydrazine (MMH) and red fuming nitric acid (RFNA, ~85% HNO<sub>3</sub> + 15% N<sub>2</sub>O<sub>4</sub>) to achieve conditions favorable for ignition. This critical residence time spans the time required for liquid phase reactions to occur at the fuel/oxidizer interface and can …
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Chemical modification of petroleum coke and applications of derived materials
… was used as a precursor for preparing solid acid catalysts through direct functionalization (i.e., without an activation step) with nitric acid to access the inherent sulfur. For comparison, catalysts were also prepared using sulfuric acid and a mixture of nitric and sulfuric acid (1:3 vol …
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Synthesis and Environmental Applications of Mesoporous Alumina
… and aluminum isopropoxide in the presence of nitric acid. This synthesis afforded mesoporous alumina materials with high specific surface area, large pore volume, and large pore width. This study showed that the specific surface area and porosity of alumina can be tuned to some degree by …
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Solid amine-boranes as high performance hypergolic hybrid rocket fuels
… as these tend to react readily with both nitric acid and dinitrogen tertroxide based oxidizers. It has been found that the addition of a borane adduct to an amine fuel tends to reduce the ignition delay by up to an order of magnitude with white fuming nitric acid (WFNA). The borane …
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The use of nitrogen dioxide for the oxidation of ammonium nitrate
… NO2 through a solution of animonium nitrate in nitric acid is successful in the decomposition of the ammonium ion (NH:). The rate of reaction increases with increasing temperature and the activation energy of the reaction has been calculated as 61.8 Id moP. The reaction is first order with …
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XYLARIC ACID, D-ARABINARIC ACID (D-LYXARIC ACID), L-ARABINARIC ACID (L-LYXARIC ACID), AND RIBARIC ACID-1,4-LACTONE; SYNTHESIS AND ISOLATION - SYNTHESIS OF POLYHYDROXYPOLYAMIDES THEREFROM
<p>This dissertation describes the nitric acid oxidation of the pentoses D-xylose, L-arabinose, D-arabinose, and D-ribose to produce xylaric acid, L-arabinaric acid (L-lyxaric acid), D-arabinaric acid (D-lyxaric acid), and ribaric acid, respectively, or salts therefrom. Isolation of the aldaric …
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XYLARIC ACID, D-ARABINARIC ACID (D-LYXARIC ACID), L-ARABINARIC ACID (L-LYXARIC ACID), AND RIBARIC ACID-1,4-LACTONE; SYNTHESIS AND ISOLATION - SYNTHESIS OF POLYHYDROXYPOLYAMIDES THEREFROM
<p>This dissertation describes the nitric acid oxidation of the pentoses D-xylose, L-arabinose, D-arabinose, and D-ribose to produce xylaric acid, L-arabinaric acid (L-lyxaric acid), D-arabinaric acid (D-lyxaric acid), and ribaric acid, respectively, or salts therefrom. Isolation of the aldaric …
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Heavy Metal Concentrations in Springs and Sinkholes in and Around Springfield, Greene County, Missouri
… Emission Spectroscopy (ICP-AES) and a single nitric acid extraction. A t-test was used to compare each of the statistical mean metal concentrations with controls (deionized water passed through a Barnsted/Thermolyne filtration apparatus), and with samples from each of the sites. A significant …
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Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
… form ion exchange resin to give D-glucaric acid, which was then reacted with a diamine. The glucarate portion of the salt was activated for polymerization through esterification in HCl/methanol. Polymerization was initiated by basification of the resulting mixture. The molecular weights of …
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Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
… form ion exchange resin to give D-glucaric acid, which was then reacted with a diamine. The glucarate portion of the salt was activated for polymerization through esterification in HCl/methanol. Polymerization was initiated by basification of the resulting mixture. The molecular weights of …
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A photographic investigation of the collision, reaction, and ignition of hypergol droplets
… impacting hydrazine droplets with white fuming nitric acid droplets at an impact velocity of 35 cm/sec and at temperatures from 200°C to 425°C. The second series utilized the same fuel and oxidizer at an impact velocity of 122 cm/sec and at temperatures ranging from 50°C to 430°C. The third …
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