**6. Acknowledgements**

The chapter has been done in connection with project Institute of clean technologies for mining and utilization of raw materials for energy use, reg. no. CZ.1.05/2.1.00/03.0082 supported by Research and Development for Innovations Operational Programme financed by Structural Founds of Europe Union and from the means of state budget of the Czech Republic. Presented work was also supported by the Academy of Sciences of the Czech Republic, project No. AV0Z30860518. Author is thankful for the support.
