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As the quantitative statistical characteristics reflecting the average relative values of the active surface of nanomaterials are prompted to introduce the rms diameter and polydispersity index of nanoparticles (Rakhimov 2014). The question is: from which size dimension of particles some special properties getting acquired, namely are there nano-structure properties appearing, and at what size dimensions are they appearing? What can be considered as a nanoparticle with all their acquired features?
Special drawing catalysts comprising platinum metals, palladium and platinum, as active ingredients, were investigated, Table 1. Fiber polymers - polypropylene fiber, polyacrylonitrile, carbon fibers, low modulus carbon, fibrous materials obtained by carbonization and subsequent activation of mats from “Mtilon-M”, copolymers of polyacrylonitrile and hydrocellulose, were used as bearers.
The possibility of exhaustive removal of toxic components, mainly CO, from air by passive systems has been achieved with advent of nanocatalysts (Rakhimov et al., 2014). A decisive influence of substrates nature on the activity and stability and the process character was determined (Rakhimov et al., 2014; Nurmukhammadov et al., 2014; Smanova et al., 2011; Madusmanova et al., 2020). At the same time, it is obvious that the state and also physical and chemical characteristics of active component will exert not smaller influence on properties of the catalytic system in whole.
Activity of catalysts was determined by decreasing the CO content in gas-air mixture at room temeprature. The rms diameter and coefficient of polydispersity of nanoparticles (Rakhimov 2014) were measured by transmission electron microscopy, Table 1.