The Silicon-Nitrogen Bond

Abstract

SUMMARYA short survey of the silicon-nitrogen bond is given with its intermediate position between the silicon-carbon and the siliconoxygen bond. The preparation of the SiN bond by different synthetic routes is described. Also dealt with are its special character with regard to the non-existence of (P-P)7T double bonds under normal conditions and the easy formation of additional (d~p)7T bonds, which strengthen the original (p-p)a bond, as well as of additional (d~P)a bonds enlarging the coordination number of silicon from 4 to 5 and 6. The most important classes of siliconnitrogen compounds 'are described together with their properties, reactions and applications.

Plasma ammonia synthesis over mesoporous silica SBA-15

“…Apart from the advantages above mentioned, oxides, such as silica, are appealing materials for ammonia synthesis due to their: (a) the lower electrical resistivity of the SiO 2 that can lead to more stable and uniform plasma discharges [32]. This latest is a challenge in atmospheric plasmas; (b) readiness to dissolve hydrogen [20]; (c) weakly bonding with nitrogen [33]; (d) high chemical stability in the presence of water and some hydrocarbons, which are typical impurities in natural gas wells (hydrogen for ammonia production is typically obtained from steam reforming of methane [34]), and (e) the presence of a porous structure with accessible pores for guest molecules diffusion. Since the desorption processes of the products are also important.…”

Sustainable ammonia synthesis from nitrogen wet with sea water vapor by single-step plasma catalysis

“…Besides their low cost, they offer textural, compositional, and morphological properties that can be tailored for diverse targeted catalytic reactions [35]. Specially, silica is an appealing material for plasma catalytic ammonia synthesis due to: (i) its low electrical resistivity that can lead to more stable and uniform plasma discharges; [36] (ii) readiness to dissolve hydrogen; [37] (iii) weak bonding with nitrogen; [38] (iv) high thermal and chemical stability in the presence of water, which is the source of hydrogen in this work. Our catalyst selection is supported by our group's previous experience on the rational design of catalysts for ammonia synthesis [27,30,39].…”