Carbon monoxide silicon carbide

When silicon dioxide (sand) and carbon are heated, the products are silicon carbide, SiC, and carbon monoxide. Silicon carbide is a ceranuc material that tolerates extreme temperatures and is used as an abrasive and in the brake discs of sports cars. How many grams of CO are formed from 70.0 g of Si02 and 50.0 g of C ... 

Chemical vapor infiltration (CVI) of carbon fibers with silicon monoxide provides a textbook example (Figure 14) about the relationship between percent conversion of carbon to silicon carbide (a process variable) and fiber strength at elevated temperatures (a product variable). 

Silica is reduced to silicon at 1300—1400°C by hydrogen, carbon, and a variety of metallic elements. Gaseous silicon monoxide is also formed. At pressures of >40 MPa (400 atm), in the presence of aluminum and aluminum halides, silica can be converted to silane in high yields by reaction with hydrogen (15). Silicon itself is not hydrogenated under these conditions. The formation of silicon by reduction of silica with carbon is important in the technical preparation of the element and its alloys and in the preparation of silicon carbide in the electric furnace. Reduction with lithium and sodium occurs at 200—250°C, with the formation of metal oxide and silicate. At 800—900°C, silica is reduced by calcium, magnesium, and aluminum. Other metals reported to reduce silica to the element include manganese, iron, niobium, uranium, lanthanum, cerium, and neodymium (16). 

Two principal mechanisms that may be responsible for mass loss from red giants are considered shock wave-driven winds and radiatively (dust)-dr iven winds. Effect of the periodic shocks accompanying nonlinear oscillations of red giants is most prominent in the outer layers of the stellar atmosphere where shocks are able not only to expel gas but also increase gas density so that some molecular components become supersaturated. In 0-rich stars the most abundant condensible species are silicon monoxide and iron, whereas in C-rich stars these are carbon, silicon carbide and iron. 

Photochemical reduction of C02 was also achieved in the presence of the p-type semiconductor (copper oxide) or silicon carbide electrodes [97]. Irradiation of this system generates methanol and methane as the main products in the case of CuO electrode whereas hydrogen (with efficiency about 80%), methanol (16%), methane, and carbon monoxide in the case of SiC electrode. Also Ti02/CuO systems appeared relatively efficient (up to 19.2% quantum yield) in photocatalytic C02 to CH3OH reduction [98]. 

Many nonoxide ceramics form gaseous reaction products when oxidized. For example, when an alumina/silicon carbide composite is exposed to an oxidizing environment, SiC will oxidize, forming carbon monoxide via the following reaction ... 

Silicon carbide (SiC) is made by the high-temperature reaction of silica sand (quartz) with coke the byproduct is carbon monoxide. 

Phosphoric acid fuel cell (PAFC) was the first fuel cell to be commercialized. PAFC uses liquid phosphoric acid as an electrolyte, which is soaked in silicon carbide particle matrix using capillary action. PAFC is tolerant to CO2 feed stream because the electrolyte is an acid. However, carbon monoxide poisons the Pt electrodes so that its concentration should be below 3-5 volume % in the feed stocks. 

Phosphoric acid concentrated to 100% is used as an electrolyte in this cell that operates between 150°C and 220°C. At lower temperatures, phosphoric acid is a poor ionic conductor and carbon monoxide poisoning of the platinum electrocatalyst in the anode becomes severe. The relative stability of concentrated phosphoric acid is high compared to other common acids. Consequently, the PAFC is capable of operating at the high end of the acid temperature range (100°C-220°C). In addition, the use of concentrated acid (100%) minimizes the water vapor pressure, so water management in the cell is not difficult. The matrix universally used to retain the acid is silicon carbide and the electrocatalyst in both the anode and the cathode is platinum. 

Problem Silicon carbide (SiC) is an important ceramic material that is made by allowing sand (silicon dioxide, Si02) to react with powdered carbon at high temperature. Carbon monoxide is also formed. When 100.0 kg of sand is processed, 51.4 kg of SiC is recovered. What is the percent yield of SiC from this process ... 

Dusts aluminium oxide, silicon carbide, silica, energy,carbomndum GasesA apors carbon monoxide, solvents, vaporised resins... 

Nonflammable gas. Chlorine pentafluoride is a highly reactive substance. It reacts explosively with water. Paper, cloth, wood, and other organic matter would burst into flames upon contact with the liquid or vapor of chlorine pentafluoride. Vigorous to violent reaction occurs with metals. Reactions with oxides, sulfides, halides, and carbides of metals are violent. It forms explosive mixtures with hydrogen, carbon monoxide, hydrocarbon gases, ammonia, phosphine, sulfur dioxide, and hydrogen sulfide. It reacts violently with sulfur, phosphorus, silicon compounds, charcoal, and mineral acids. 

Nakagomi, S., Tobias, R, Baranzahi, A., Lundstrom, I., Martensson, P. and Lloyd Spetz, A. (1997), Influence of carbon monoxide, water and oxygen on high temperature catalytic metal-oxide silicon carbide structures. Sensors and Actuators 5,45,183-91. 

Okada, K., H. Kato, R. Kubo, and K. Nakajima. 1995. Preparation of silicon carbide fiber from activated carbon fiber and gaseous silicon monoxide. Ceramic Engineering and Science Proceedings 16(4) 45-54. 

Carbonothioic acid, 0-(6-chloro-3-phenyl-4-pyridazinyl) S-octyl ester. See Pyridate, Carbonothioic dichloride. See Thiophosgene Carbon oxide. See Carbon monoxide Carbon oxide sulfide. See Carbonyl sulfide Carbon oxychloride. See Phosgene Carbon oxysulfide. See Carbonyl sulfide Carbon silicide. See Silicon carbide Carbon sulfide. See Carbon disulfide Carbon tet. See Carbon tetrachloride Carbon tetraboride. See Boron carbide Carbon tetrabromide CAS 558-13-4 EINECS/ELINCS 209-189-6 UN 2516... 

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