(544er) Oxidative Desulfurization of Thiophenic Components By Vanadium Substituted Dawson-Type Polyoxometalate Supported Catalysts
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Poster Session: Catalysis and Reaction Engineering (CRE) Division
Wednesday, October 31, 2018 - 3:30pm to 5:00pm
Oxidative Desulfurization of Thiophenic Components by
Vanadium substituted Dawson-type Polyoxometalate Supported Catalysts
M. Naderi Khomartaji, M. R. Dehghani, F.
Banisharif
Chemical Engineering Department,
Iran University of Science and Technology, Narmak, Tehran, Iran
Abstract:
In this work, a new supported catalysts for oxidative
desulfurization (ODS) of thiophenic sulfur compound (dibenzothiophene (DBT) and
benzothiophene (BT)) were synthesized by using on vanadium substituted
Dawson-type heteropoly acid, H6+xP2W18-xVxO62
(x= 1, 3, 5) and silica and titania as a support. The effect of heteropoly acid
loading on the Support (5, 15, 25 wt. %) as well as number of vanadium
substitution on ODS performance of all catalysts was studied. The result showed
that the 25 wt.% H9P2W15V3O62/TiO2
is the best one among all synthesized catalyst. The activity of titania
supported catalyst was more than silica supported catalysts. The result
obtained in this work is similar to work of Yan et al [1, 2]. The activity of
catalysts by increase in number of vanadium from 3 to 5 were decreased. It can
be because of increase in instability of polyoxometalate cage by increase in
number of vanadium [3]. The best catalyst was characterized using XRD, FT-IR
and UV spectrophotometry and polyoxometalic structure were proved. The
synthesized catalyst were utilized for oxidative desulfurization, after 20
minute following results obtained in different cases.
|
Table 1. Oxidative desulfurization of model oil: T= 60 oC, catalyst dosage= 10 g/L, Oxygen to sulfur content oil ratio=4, t= 20 min Model oil containing both 500 ppmw BT and 500 ppmw DBT in n-Octane |
||
|
Catalyst |
Dibenzothiophene Removal (%) |
Benzothiophene Removal (%) |
|
5 wt.% H7P2W17VO62/SiO2 |
68.75 |
50 |
|
15 wt.% H7P2W17VO62/SiO2 |
81025 |
58.75 |
|
25 wt.% H7P2W17VO62/SiO2 |
61.75 |
53.13 |
|
5 wt.% H9P2W15V3O62/SiO2 |
59.375 |
87.5 |
|
15 wt.% H9P2W15V3O62/SiO2 |
65.63 |
97.88 |
|
25 wt.% H9P2W15V3O62/SiO2 |
93.94 |
63.75 |
|
5 wt.% H11P2W15V5O62/SiO2 |
86.56 |
56.25 |
|
15 wt.% H11P2W15V5O62/SiO2 |
93.38 |
58.75 |
|
25 wt.% H11P2W15V5O62/SiO2 |
81.88 |
53.13 |
|
5 wt.% H7P2W17VO62/TiO2 |
87.5 |
59.38 |
|
15 wt.% H7P2W17VO62/TiO2 |
95.63 |
61.25 |
|
25 wt.% H7P2W17VO62/TiO2 |
96.25 |
62.5 |
|
5 wt.% H9P2W15V3O62/TiO2 |
91.88 |
62.2 |
|
15 wt.% H9P2W15V3O62/TiO2 |
95.06 |
68.75 |
|
25 wt.% H9P2W15V3O62/TiO2 |
98.75 |
78.13 |
|
5 wt.% H11P2W15V5O62/TiO2 |
74.38 |
51.56 |
|
15 wt.% H11P2W15V5O62/TiO2 |
75 |
54.7 |
|
25 wt.% H11P2W15V5O62/TiO2 |
87.5 |
70.3 |
Keywords: Oxidative
Desulfurization, Thiophenic Component, Dawson Polyoxomatalate
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