Thermal hydrogen desorption

The thermal hydrogen desorption of a pure LiB H4 sample into vacuum starts upon the melting of the sample. The desorption process can be catalyzed by adding Si02 and significant thermal desorption was observed starting at 200 °C [85, 86] (Figure 5.43). 

Figure 5.56 Thermal hydrogen desorption from AIH3 stabilized by an oxide layer.

The thermal hydrogen desorption spectrum of Li[BH4] at very low heating rate (0.5 Kmin ) exhibits three distinct desorption peaks [111] (Fig. 6.23). This is an... 

Amides and Imides (—NH2, = NH) The thermal hydrogen desorption from lithium amide (LiNH2) was investigated by Chen et al. [41, 42]. The thermal desorption of pure lithium amide mainly evolves NH3 at elevated... 

The thermal expansion coefficient of bulk silicon is positive at RT (2.6 x 1CT6 K-1), but becomes negative below 120 K. The thermal expansion coefficient of micro PS for heating from 290 to 870 K is found to be negative (-4.3x 10 6 KT1), which can be ascribed to hydrogen desorption and oxidation of the inner surface [Di7]. For meso PS the thermal expansion coefficient was found to increase with porosity in the temperature regime between 90 K and 300 K, from 0.4xl0-6 K 1 to... 

In Fig. 15 hydrogen desorption data from linear ramp thermal anneals of oxidized stainless steel are presented. 

Abstract. In the paper we consider the problems with moving bound that model the kinetics of hydrogen desorption from hydrides of metals. Change of phase, desorption processes and size reduction effect are taken into consideration. Equations are derived at various assumptions for the experimental method of thermal desorption spectrometry. As the high-temperature TDS-spectra peaks are considered, the diffusion may be assumed to be fast. Therefore ordinary differential equations are sufficient. We present the results of numerical experiments for the models with bulk and surface desorption. 

Castro F.J., Meyer G. (2002) Thermal desorption spectroscopy (TDS) method for hydrogen desorption characterization (I) theoretical aspects, J. of Alloys and Compounds 330-332, 59-63. 

Concentrated solar irradiation could be used to drive the thermal stages (desorption of products and regeneration of the catalyst) of this process. The advantage of this potentially solar-driven process is that it converts methane to hydrogen and valuable olefins without production of... 

Impurity atoms do perturb the character of the toluene thermal decomposition on the flat surfaces. At carbon or sulfur coverage levels of 20% or higher on Ni(100), where an ordered c(2x2) low energy difraction pattern was obtained and where the impurity atoms reside over four-fold sites, the differentiation between aliphatic and aromatic C-H bond cleavage rates was lost. Under these conditions, only a single hydrogen desorption maximum was observed. 

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