Temperature-Programmed Gasification

Coke deposited on sulfated zirconia catalyst during n-butane isomerization was studied using TPHe, using the methanator/FID configuration The treatment in helium up to 650°C removed all the coke from the catalyst. This 

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The model is able to fit quite well all the experimental results that were obtained, including the ones in temperature programmed gasification... 

Values obtained fi om the fitting of equations 1 through 3 to the experimental data for the gasification of BDH 33033 carbon under isothermal and temperature programmed reaction conditions. 

However, the pre-exponential factor, k and niAlmAm parameters present significant differences. These differences may be related to the different progression of the gasification process in the two different cases. Gasification through isothermal or temperature programmed conditions will certainly differ in the way they use-up the various sites that are available. 

In fact, the temperature programmed reaction experiment shows a k value much lower than the ones obtained in the isothermal experiments, indicating perhaps the large importance that the initial rates of gasification have on the estimation of this parameter, in connection with the fact that in these experiments the gasification process starts very slowly at rather low temperatures. 

Freriks, I. L. C., van Wechem, H. M. H., Stuiver, J. C. M., Bouwman, R. (1981). Potassium-catalysed gasification of carbon with steam a temperature-programmed desorption and fourier transform infrared study. Fuel, 60, 463—470. 

In addition the development of this filter concept for a bark fired holier application, a research program has been undertaken for evaluation of high temperature applications such as biomass gasification gases. For this purpose, a laboratory filter test unit for application at temperatures higher than >5S0°C, has been built. The filter closely resembles the system described in VDI-3926, type 2 Tests on this unit will be started shortly. 

Pyrolysis results are very important for coal characterization, as all conversion processes of coal such as combustion, liquefaction, and gasification start with a pyrolytic step. For this reason, pyrolysis was frequently used for the analysis of coals [17,18). Pyrolysis data were correlated with coal composition, coal characterization and ranking [18a], prediction of coal reactivity as well as of other properties related to coal utilization. Techniques such as Py-MS, Py-GC/MS with different ionization modes, Py-FTIR, or evolved gas analysis (EGA) [19] were described for coal analysis. Programmed temperature pyrolysis is another technique that has been proposed [17] for a complete evaluation of the two types of molecules present in coal. 

In the United States, General Atomics was the main promoter of the high-temperature reactor (HTR). The company built one HTR, at Fort St. Vrain, Colorado. It had several other orders, but the program was halted in the mid 1970s. In Germany, the Nuclear Research Center at Jiilich was the focal point for development of the so-called pebble-bed HTR for both electricity production and coal gasification. A 500-megawatt reactor was expected to go on line by 1990 but never did. 

The compositions of the alloys evaluated in Phase I are summarized in Table III. These alloys represent most classes of high-temperature iron-, nickel-, and cobalt-base alloys that could be considered for coal gasification service. Pack aluminized and chromized coatings on AISI 310 and IN-800 were also evaluated in the test program. 

Gasification is the partial oxidation of hydrocarbons in a restricted supply of oxygen at temperatures up to 1600 C and pressures up to 150 bar. Products are CO, CO2, H O, HCl (the latter to be removed). Partial oxidation as a gasification process per se or as part of refinery processes has been considered in a variety of R D programs [3]. For example ... 

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