Decomposition catalyst for

Nickel catalyst, Raney, in preparation of 2,2 bipvndine, 46, 5 VV7 J, preparation of, 46, 5 Nickel ion, as catalyst for decomposition of diazomum xanthates, 47,... 

Catergol. A Ger code name for a rocket propellant system using catalyst for decomposition Ref A.J.Zaehringer, "Solid Propellant Rockets , AmerRocketCo, Wyandotte, Mich(1955), 149... 

MP 14 = catalyst for decomposition of hydrogen peroxide (permanganates) (german)... 

As expected, there is clear evidence of incompatibility between the amine hydrochloride and the spray-dried lactose. However, the results also showed that moisture was the catalyst for decomposition, as no degradation was observed in the dry state even after 12 weeks storage at 90°C. At the time of this writing, Serrajuddin et al. (1999) have devised a protocol for compatibility testing (Table 6.19). 

Thus ferricyanide hydrolyzes photochemically to aquopentacyanoferrate which is a slightly better catalyst for decomposition than ferricyanide. On addition of ferrocyanide the ferrate is reduced to the ferrite which is more active. Some confirmation of these reactions is given by the observations that addition of the ferrate to ferricyanide increases the dark rate, and also that cyanide, nitrate, and nitrosobenzene inhibit this as well as the catalysis induced by irradiation of ferricyanide. 

The use of solid catalyst for decomposition of concentrated hydrogen peroxide (HP) solution for propulsion applications, is well known [1, 2]. Currently, the decomposition of HP is initiated by catalysts based mainly on silver metal or manganese oxides which are the best active phases [3,4]. 

Diazoalkane decomposition. Surprisingly, tetraphenylethylene is almost as efficient as various copper catalysts for decomposition of diazoalkanes to car-benoids. For example, diazomethane and cyclohexene in the presence of this catalyst react to form norcarane in 15 5% yield with copper catalysis the yield of norcarane is 24%. Cyclopropanations have been observed with this hydrocarbon catalyst with a variety of diazo compounds diazomethane, a-diazoacetophenone, and diazofluorene. Diphenyldiazomethane, however, is converted mainly into benzophenone azine, (C5H5)2C=NN=C(C6Hs)2. 

Cubic ordered mesoporous crystalline Ct203 was prepared using a nonionic surfactant template. A combination of CrlNOsls and ethylene glycol (EG) in propanol (PrOH) solution was essential to produce the desired ordered mesoporous Cr203. The prepared mesoporous Cr203 exhibits high efficiency as a catalyst for decomposition of volatile organic compounds (VOCs). 

Decomposition is accelerated by sunlight, low pH, and the presence of heavy metals. Avoidance of sunlight is a factor in the design of storage facilities and product containers. The problem of decomposition at excessively low pH was mentioned above in connection with packed-column performance. The effects of metals vary. Iron, for example, is not a particularly strong catalyst for decomposition, but concentrations of more than 1 ppm produce discoloration. Certain other metals are stronger catalysts. Nickel and copper ate frequently encountered examples, and their specifications normally are set at 50 ppb. Gordon et al. [70] have reported on the effects of various metals. The order of their activity is Ni > Co > Cu > Fe > Mn > Hg [71]. 

Futamura, S., Kushiyama, S., and Kim, H.-H. (2003) Effective combination of nonthermal plasma and catalysts for decomposition of benzene in ait Appl Catal B Environ., 46 (1),... 

Cho, C. and Hun, S. (2002). Development of New Vanadium-Based Oxide Catalysts for Decomposition of Chlorinated Aromatic Pollutants, Environ. Sci. Technol, 36, pp. 1600-1606. 

An effective group of compounds are those which can decompose peroxides catalytically, so one molecule may destroy very many peroxide molecules. Typical examples are the thiodipropionate esters ROCOCH2CH2SCH2CH2COOR where R = C12H25, or CigH37, and the metal salts of thiocarbamic acids. The way in which these additives work is very complex indeed (Scott, 1983), involving oxidation of the sulfur by reaction with hydroperoxides. This in turn liberates sulfm aeids, powerful catalysts for decomposition of peroxides by ionic mechanisms. Overall, the effect is that each molecule of antioxidant destroys several molecules of peroxide, while itself being destroyed. 

Special care must be taken in the design and operation of adsorption units handling ketone solvents, such as methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone, because of their reactivity in the presence of activated carbon. Traces of metal compounds in the carbon act as catalysts for decomposition reactions, which are further accelerated by the presence of heat and moisture. The decomposition reactions are exothermic and if allowed to continue can cause hot spots in the bed and ultimately fires. According to Collins (1988), ketone adsorption and recovery can be accomplished safely if these guidelines are followed ... 

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