Hydrogen efficiency

The combination of CO shift with membrane separation of H2 and in situ C02 capture is mentioned as an advanced process to optimize the hydrogen yield LHV-based cold hydrogen efficiencies of 72% are reported in such configurations.93... 

As shown in Table 13.1, toluene is a candidate compound to form the naphthalene oil. To utilize the reaction pair of methylcyclohexane dehydrogenation/toluene hydrogenation as an additive component, it is, thus, necessary to generate hydrogen efficiently from methylcyclohexane under mild reaction conditions. 

The critical point in this syntrophic cooperation is that the reaction that Strain S is catalyzing (Eq. 1) is only exergonic (negative ArG) if the H2 partial pressure (or the corresponding H2 concentration) in the aqueous phase is low enough. Hence, strain M.o.H. has to remove hydrogen efficiently from the solution. 

Unsaturated sterols such as cholesterol, campesterol, sitosterol and bile alcohols with unsaturated side chains can be transfer hydrogenated efficiently and with high yields under microwave irradiation, using ammonium formate and a Pd/C catalyst in methylene chloride/propylene glycol solvents (Scheme 4.3)17. 

Carson, T. C. Hastings, K. E. Potts, J. D. Caspers, J. Two-Step Coal Liquefaction is a Hydrogen Efficient Route to Distillate Fuels, presented at the Fall Conference, Canadian Society for Chemical Engineering, Sarnia, Ontario, October 2, 1979. 

The curve labelled simple thermo analysis in Figure 1 represents Eq. (2). This equation provides a useful reference against which detailed system analyses can be measured. The simple thermodynamic analysis agrees quite closely with the detailed system analysis results for the no-sweep cases, which correspond directly with the conditions of simple analysis since it does not include consideration of a sweep gas. Overall hydrogen efficiency results of the air-sweep cases are about 1% lower than the no-sweep cases. 

Figure 3 Overall thermal-to-hydrogen efficiencies for HTE coupled to three different reactor types, as a function of reactor outlet temperature...

The unique itaconate-like substrate 53 has been hydrogenated efficiently and with high selectivity (>99% ee) using the (R,R)-Me-DuPhos-Rh catalyst to afford 54, an important intermediate for the drug candoxatril (Scheme 13.16).60... 

The SRC-I coal liquefaction process is designed to produce a clean, coal-derived solid fuel in a single, noncatalytic reaction step. (1) Design of a demonstration plant for the SRC-I process is new under way. (2) A two-step, hydrogen efficient modification of the noncatalytic SRC I technology has been proposed and studied extensively on a laboratory scale. (3-6) Two-step SRC I technology is also being tested in pilot plant scale facilities. 07, S)... 

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