Asian Journal of Multidimensional Research (AJMR)
https://www.tarj.in
345
AJMR
aromatization reaction of C
1
-C
4
-alkanes and to study the physicochemical and textural
characteristics of the catalyst and evaluate the laws of the process.
EXPERIMENTAL PART
Catalytic conversion of hydrocarbons C
1
-C
4
in a steel flow reactor with an internal diameter of 12
mm, at normal atmospheric pressure, in the range of 550-650
℃
, the volumetric velocity of the
reagent mixture at 175-350 ml/min and contact time 0.5 -17.0 sec. The contact time was
calculated according to the formula
𝜏 = 𝑉/𝐹
. In this case, the empty volume of the V-reactor, ie
the difference between the volume of the reactor and the volume of the catalyst; the Volumetric
velocity of the F-hydrocarbon mixture flow. The value of the heterogeneous factor S/V, (S-
catalyst surface, V-free volume) ranged from 8.5 to 6.6 ∙ 10
5
cm
-1
. The calculation of the velocity
constant is based on the relationship between the first-order reaction equation
𝑙𝑛[1/(1 − 𝛼)]
(where a is the conversion rate) and the contact time
𝜏
, and the activation parameters are based
on the values of velocity constants at 5 temperatures. Calculated using the least-squares method.
The reaction products were analysed by gas chromatography on a thermal conductivity detector
LXM-80. Separation of H
2
, O
2
, N
2
, CH
4
, CO was carried out in a column filled with zeolite 5 A
with a length of 2 m and an inner diameter of 3 mm. Separation temperature-isothermal,
temperature -70
℃
, carrier gas-argon, gas flow rate -20 ml/min. Separation of C
2
-hydrocarbons
and CO
2
was carried out in a column 2 m long and 3 mm in diameter, filled with Porapak Q.
Temperature regime of separation-isothermal, temperature-80
℃
, carrier gas helium, gas flow
rate 20 ml/min. Separation of C
3
-C
4
hydrocarbons was carried out in a 4 m long, 3 mm in
diameter column of aluminium oxide treated with Vaseline oil. Separation temperature mode -
isothermal, temperature - 20
℃
, carrier gas-helium, gas flow rate 20 ml/min. The composition of
the starting and forming substances was analyzed on a chromatograph LXM-8 (column size 3.5-
0.5 cm) in a column filled with fluorinated Al
2
O
3
[15-17].
The acidic properties of the catalysts were investigated by thermogrammed desorption of
ammonia. The structure and position of the active centres of the catalyst were determined by
electron microscopy, and the surface area was determined by the BET method.
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