TY - JOUR
T1 - Effect of the Si/Al ratio in Ga/mesoporous HZSM-5 on the production of benzene, toluene, and xylene
T2 - Via coaromatization of methane and propane
AU - Gim, Min Yeong
AU - Song, Changyeol
AU - Lim, Yong Hyun
AU - Lee, Kwan Young
AU - Kim, Do Heui
N1 - Funding Information:
This research was supported by the C1 Gas Refinery Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT & Future Planning (2016M3D3A1A01913252).
Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019
Y1 - 2019
N2 - In this work, a series of GaOy supported on mesoporous HZSM-5 (GaOy/meso-XHZSM-5; Si/Al (X), X = 10, 20, 30, and 40) catalysts with different Si/Al molar ratios were prepared for use in the coaromatization of methane and propane. The coaromatization of methane and propane was conducted at 550 °C with a molar ratio of 10:1. Gallium oxide (2 wt%) supported on mesoporous HZSM-5 with a Si/Al molar ratio of 20 showed the highest catalytic performance, with an initial BTX yield of 14.2% and a final BTX yield of 13.8% after 6 h of reaction. The catalytic performances of the catalysts showed volcano-shaped trends depending on the Si/Al molar ratio. All of the catalysts showed a slight decrease in activity with time, although the degree of deactivation increased with increasing Si/Al ratio. The poisoning of acid sites by coke deposition is suggested to be the main reason for deactivation. The effects of the Si/Al molar ratio on the physicochemical properties and catalytic performance of the catalysts were investigated. As the molar ratio of Si/Al increased, the BET surface area and pore volume of the catalysts increased, while their total acidity decreased. Hence, it is concluded that both the acid properties and textural properties of the catalysts play a crucial role in determining the catalytic performance in the coaromatization of methane and propane. In summary, GaOy/meso-20HZSM-5 with optimum physicochemical properties demonstrated the best catalytic performance in the coaromatization of methane and propane.
AB - In this work, a series of GaOy supported on mesoporous HZSM-5 (GaOy/meso-XHZSM-5; Si/Al (X), X = 10, 20, 30, and 40) catalysts with different Si/Al molar ratios were prepared for use in the coaromatization of methane and propane. The coaromatization of methane and propane was conducted at 550 °C with a molar ratio of 10:1. Gallium oxide (2 wt%) supported on mesoporous HZSM-5 with a Si/Al molar ratio of 20 showed the highest catalytic performance, with an initial BTX yield of 14.2% and a final BTX yield of 13.8% after 6 h of reaction. The catalytic performances of the catalysts showed volcano-shaped trends depending on the Si/Al molar ratio. All of the catalysts showed a slight decrease in activity with time, although the degree of deactivation increased with increasing Si/Al ratio. The poisoning of acid sites by coke deposition is suggested to be the main reason for deactivation. The effects of the Si/Al molar ratio on the physicochemical properties and catalytic performance of the catalysts were investigated. As the molar ratio of Si/Al increased, the BET surface area and pore volume of the catalysts increased, while their total acidity decreased. Hence, it is concluded that both the acid properties and textural properties of the catalysts play a crucial role in determining the catalytic performance in the coaromatization of methane and propane. In summary, GaOy/meso-20HZSM-5 with optimum physicochemical properties demonstrated the best catalytic performance in the coaromatization of methane and propane.
UR - http://www.scopus.com/inward/record.url?scp=85074980523&partnerID=8YFLogxK
U2 - 10.1039/c9cy01619h
DO - 10.1039/c9cy01619h
M3 - Article
AN - SCOPUS:85074980523
VL - 9
SP - 6285
EP - 6296
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
SN - 2044-4753
IS - 22
ER -