Chemisorption and catalytic methods The disadvantages inherent in absorption and adsorption methods force the use of more
universal catalytic and chemisorption methods.
They can be divided into the following groups [6]:
a) catalytic: organosulfur substances undergo hydrogenolysis to saturated hydrocarbons
C
n
H
2n + 2
and H
2
S, destruction (cracking) with the formation of unsaturated hydrocarbons C
n
H
2n
and
H
2
S, hydrolysis with elimination of H
2
S and its oxidation to SO
2
;
b) chemisorption: interaction of sulfurous substances with metals or their oxides occurs with
the formation of metal sulfides;
c) chemisorption-catalytic: in its first stage, chemisorption processes occur, in the second,
after partial sulfiding of the contact, simultaneously chemisorption and catalytic processes on the
formed metal sulfides as catalysts, and in the third, after complete sulphurization, only catalytic
processes.
Hydrogenolysis methods are the most widely used among catalytic methods. organosulfur
substances [5-7].
For this purpose, catalysts based on Ni, Mo, Co, W, etc. are widely used. At the
same time, the following reactions can occur in the temperature range of 300–450°C [8]:
RSH + H 2 → RH + H 2 S, RSR' + 2H 2 → RH + R'H + H 2 S, C 4 H 4 S + 4H 2 → C 4 H 10 + H 2 S, COS + H 2 → CO + H 2 S, COS + 4H 2
