The importance of pre-treatment of spent hydrotreating catalysts on metals recovery
Química Nova, 2011 This work describes a three-step pre-treatment route for processing spent commercial NiMo/Al2O3 catalysts. Extraction of soluble coke with n-hexane and/or leaching of foulant elements with oxalic acid were performed before burning insoluble coke under ...
Alexandre Luiz de Souza Pereira +3 more
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Comparison of sulfuric and oxalic acid anodizing for preparation of thermal control coatings for spacecraft [PDF]
The development of thermal control surfaces, which maintain stable solar absorptivity and infrared emissivity over long periods, is challenging due to severe conditions in low-Earth orbit (LEO).
Le, Huong G. +2 more
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Solubility of Sulfur Dioxide in Sulfuric Acid [PDF]
The solubility of sulfur dioxide in 50% (wt./wt.) sulfuric acid was evaluated by regular solution theory, and the results verified by experimental measurements in the temperature range of 25 C to 70 C at pressures of 60 to 200 PSIA. The percent (wt./wt.)
Chang, K. K. +2 more
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BioResources, 2017 An M-O-L acid (mineral acid, organic acid, and Lewis acid)-catalyzed integrated process for furfural production from corncob was proposed to improve corncob conversion and furfural selectivity.
SuPing Zhang +3 more
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Determination of the viscosity number of thermoplastics in dilute solution; polyamides (PA) [PDF]
This West German Standard presents a test used to determine the viscosity number of polyamides and copolyamides which are easily diluted in sulfuric acid, and for other polyamides which are less easily diluted in sulfuric acid, and which are diluted in m-
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Method for producing oxygen from lunar materials [PDF]
, 1993 This invention is related to producing oxygen from lunar or Martian materials, particularly from lunar ilmenite in situ. The process includes producing a slurry of the minerals and hot sulfuric acid, the acid and minerals reacting to form sulfates of the
Sullivan, Thomas A.
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Wear of iron and nickel in corrosive liquid environments [PDF]
Friction and wear behavior of Fe and Ni sliding on aluminum oxide in aerated sulfuric acid and hydrochloric acid were investigated. The results show that the concentration of acid is an important factor in controlling the metal loss caused by wear ...
Miyoshi, Kazuhisa +1 more
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A spectrophotometric study of the behavior of carbohydrates in seventy-nine per cent sulfuric acid [PDF]
, 1949 The spectral characteristics of solutions of eighteen representative monosaccharides in 79 per cent sulfuric acid have been determined for solutions maintained for 2 hours at 25° and 15 minutes at 100°.
Ikawa, Miyoshi, Niemann, Carl
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Calculation of composition distribution of ultrafine ion-H2O-H2SO4 clusters using a modified binary ion nucleation theory [PDF]
Thomson's ion nucleation theory was modified to include the effects of curvature dependence of the microscopic surface tension of field dependent, nonlinear, dielectric properties of the liquid; and of sulfuric acid hydrate formation in binary mixtures ...
Chan, L. Y. +3 more
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Product Protection, the Key to Developing High Performance Methane Selective Oxidation Catalysts [PDF]
, 2009 Selective, direct conversion of methane to methanol might seem an impossible task since the C−H bond energy of methane is 105 kcal mol^(−1) compared to the C−H bond energy for methanol of 94.
Ahlquist, Mårten +3 more
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