Selective hydrogen combustion

Tsikoyiannis, J.G. Stern, D.L. Grasselli, R.K. Metal oxides as selective hydrogen combustion (SHC) catalysts and their potential in light paraffin dehydrogenation. J. Catalysis. 1999, 184, 77. 

Czuprat O, Caro J, Kondratenko V A and Kondratenko E V (2011), Dehydrogenation of propane with selective hydrogen combustion a mechanistic study by transient analysis of products , Catal Comm, 11,1211-1214. 

Beckers J, Rothenberg G Ce0.95Cr0.05O2 and Ce0.97Cu0.03O2 active, selective and stable catalysts for selective hydrogen combustion, Dcdton Trans (29) 5673—5682, 2009. 

Grasselli RK, Stem DL, Tsikoyiannis JG Catalytic dehydrogenation (DH) of light paraffins combined with selective hydrogen combustion (SHC)—I. DH ->SHC ->DH catalysts in series (co-fed process mode), Appl Catal A Gen 189(l) l-8, 1999a. 

Kaneko S, Arakawa T, Ohshima M, et al Dehydrogenation of propane combined with selective hydrogen combustion over Pt-Sn bimetallic catalysts, Appl Catal A Gen 356 (l) 80-87, 2009. 

Homogeneous catalysts have now been reported for hydrogenation of carbon monoxide, a combustion product of coal (see Section VI,B). More effective catalysts will undoubtedly be discovered in the near future. Polynuclear or, at least, binuclear sites are favored for reduction of the triple bond in carbon monoxide (see Section VI,B), and this together with the popular parallelism to heterogeneous systems, has renewed interest in metal clusters as catalysts (see Section VI). A nickel cluster is the first catalyst reported for mild (and selective) hydrogenation of the triple bond in isocyanide (see Section VI,A). The use of carbon monoxide and water as an alternative hydrogen source is reattracting interest (see Section VI,C). 

The investments mentioned do not indude offsites or storage facilities, which together account for 40 to 50 per cent of the battery limits investments. They are related to the complete steam cracl g unit, to the ezdusion of the treatment of the C4 cut (butadiene extraction in particular) and the Ci cut (selective hydrogenations). Hence the account for the different separations and selective hydrogenations of the C2 and C3 cuts. The consumption figures are net values. Residual combustible gases are presumed to be... 

The oxidative combustion wifli ion-selective electrode method described here can be used to accurately determine fluorine in liquid hydrocarbons and liquefied petroleum gases at levels down to 0.5 ng/pl. Results obtained are in good agreement with those achieved with the Wickbold Oxy-Hydrogen Combustion method. The oxidative combustion with ion-selective electrode method is less time consuming, less hazardous, and more sensitive than the Wickbold method. The analysis is also applicable to a range of sample types not discussed here, including aqueous based systems and solids. 

Heterogeneous catalysts are extensively employed in the petroleum, chemical, and environmental control industries to control the activity and selectivity of various chemical reactions (e.g., selective oxidation, combustion, hydrogenation, dehydrogenation, polymerization, hydrocarbon cracking, etc.) [1], Consequently, catalyst technologies have a significant impact on the economics of industrialized nations [2]. Heterogeneous catalysts consist of many different solid materials [3] ... 

Beckers J, Lee AF, Rothenberg G Bismuth-Doped Ceria, Ce0.90Bi0.10O2 a selective and stable catalyst for clean hydrogen combustion, Adv Synth Catal 351(10) 1557—1566, 2009. 

Hydrogen also can be selected as a reaction unit since all the hydrogen in butane ends up in the H2O produced during combustion. Thus, we can write... 

Final purification of argon is readily accompHshed by several methods. Purification by passage over heated active metals or by selective adsorption (76) is practiced. More commonly argon is purified by the addition of a small excess of hydrogen, catalytic combustion to water, and finally redistiHation to remove both the excess hydrogen and any traces of nitrogen (see Fig. 5) (see Exhaust control, industrial). With careful control, argon purities exceed 99.999%. 

The simultaneous analysis of orthophosphate, glycerol phosphates, and inositol phosphates has been achieved by spectrophotometric analysis of the molybdovanadate complexes. Also, a sensitive and selective chemiluminescent molecular emission method for the estimation of phosphorus and sulphur is described, which is based on passing solutions into a cool, reducing, nitrogen-hydrogen diffusion flame. For organic compounds it was usually necessary to prepare test solutions by an oxygen-flask combustion technique. 

The photodecomposition and thermodecomposition of nitromethane have been extensively studied as model systems in combustion, explosion and atmosphere pollution processes[l]. On another hand, nitromethane was selected as a model solvent in experiments aimed at examining non hydrogen-bonded solvent effects in a general acid-base theory of organic molecules [2.3]. This selection is based on the electronic and structural characteristics of nitromethane that has a high dielectric constant, and at the same time cannot form hydrogen bonds with solute molecules. 

Catalytic hydrogenations are generally highly selective with almost quantitative yield (Rylander, 1979 Augustine, 1976). As the metals are recovered from spent catalysts, essentially no non-combustible waste is generated. 

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