Catalytic performance of gallium oxide based-catalysts for the propane dehydrogenation reaction: effects of support and loading amount

• Published in: RSC advances Vol. 7; no. 8; pp. 471 - 4723
• Main Authors: Shao, Chun-Tao, Lang, Wan-Zhong, Yan, Xi, Guo, Ya-Jun
• Format: Journal Article
• Language: English
• Published: 01-01-2017
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c6ra27204e

The different materials (ZSM-5, SBA-15, γ-Al
2
O
3
and SiO
2
) were used as supports for Ga
2
O
3
-based catalysts for the propane dehydrogenation reaction, and the effect of Ga
2
O
3
content (1-9 wt%) for
x
Ga
2
O
3
/SBA-15 catalysts on the catalytic activity was discussed. It is found that the supports determine the porous features, the state and dispersion of Ga species, and the acid-base properties of the corresponding catalysts. The existence of strong acid sites in catalyst can lead to more well-dispersed Ga species. The satisfied catalytic performances are obtained over 5Ga
2
O
3
/ZSM-5 and 5Ga
2
O
3
/SBA-15 catalysts. Among the Ga
2
O
3
-based catalysts with different supports, the 5Ga
2
O
3
/ZSM-5 sample exhibits the highest catalytic activity, which possesses the maximum well-dispersed gallium species and high dehydrogenation efficiency gallium ions (Ga
δ
+
cations,
δ
< 2), and the 5Ga
2
O
3
/SBA-15 catalyst exhibits the highest catalytic stability. Furthermore, as for the
x
Ga
2
O
3
/SBA-15 samples, the 5Ga
2
O
3
/SBA-15 sample exhibits the best catalytic performance. The initial propane conversion and propylene selectivity are above 32.0% and 90.0% respectively, and a final propane conversion of 17.0% is obtained after 30 h reaction. With the increase of Ga loading, the Ga species are easily agglomerated and destroy the structural integrity of the SBA-15 support, which is unfavorable to the propane dehydrogenation reaction.
Ga
2
O
3
-based catalysts supported on different supports (ZSM-5, SBA-15, γ-Al
2
O
3
and SiO
2
) were prepared, and the effects of supports and Ga
2
O
3
content (1-9 wt%) on their catalytic performance for the propane dehydrogenation reaction were discussed.