Citation: MENG Gen, KONG De-Jin, QI Xiao-Lan, XU Zhong-Qiang. Carbon Deposition on a Toluene Disproportionation and Transalkylation Catalyst[J]. Acta Physico-Chimica Sinica, ;2010, 26(11): 3017-3022. doi: 10.3866/PKU.WHXB20101118 shu

Carbon Deposition on a Toluene Disproportionation and Transalkylation Catalyst

1.
Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, P. R. China

Received Date: 22 April 2010
Available Online: 24 September 2010
Fund Project: 上海市科委科技攻关项目(08521101900)资助 (08521101900)

The nature of carbon deposition on a toluene disproportionation and transalkylation catalyst was characterized using thermogravimetry and differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy, N₂ adsorption/desorption and NH3-temperature programmed desorption (NH₃-TPD). Result showed that the kinetics of hard coke combustion approximately fitted a first order reaction with respect to the amount of coke and, therefore, most of the coke existed in a monolayer state and the corresponding apparent activation energy was about 110 kJ·mol^-1. There were three kinds of carbon species on the surface of the Cat-1000 catalyst, which presented the catalyst after 1000 h reaction. The C atom fractions in the presence of C—O, C=O, and —C—C— were 22.7%, 9.1%, 68.1%, respectively. The formed carbon species on the Cat-1000 catalyst surface was mostly a graphite structure. The results showed that three quarters of the total carbon deposition on Cat-1000 was hard coke and the rest was soft coke. The specific surface area of the Cat-1000 catalyst decreased obviously compared with the catalyst without reaction (Cat-0). The Cat-1000 had almost unchanged acid intensity as well as high activity and stability. This shows that the cokes mainly deposit on the binder.
- Toluene disproportionation,
- Transalkylation,
- Carbon deposition,
- Catalyst,
- Thermogravimetry and differential thermal analysis
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