Thermal behaviors of deactivation catalysts for synthesizing 2, 3, 5-trimethylhydroquinone

Abstract

The thermal behaviors of the deposits on supported noble metal catalysts for synthesizing 2, 3, 5-trimethylhydroquinone by DSC were studied. The results show that the supported Pd catalysts have two exothermic peaks at around 312 °C and 435 °C in the DSC thermograms, respectively, while the supported Pt catalysts have one exothermic peak at approximately 345 °C. Therefore, it is supposed that the adsorptive states of deposits on supported Pt catalysts and supported Pd catalysts are different, which may be one reason leading to the stability difference between supported Pt catalysts and supported Pd catalysts.

Keywords

deposit / supported Pd catalysts / supported Pt catalysts / DSC

References

[1] QianDong, CuiJia, TanYan-zhi, et al.. Sythesis of d, l-α-tocopherol catalyzed by heteropoly acids[J]. Chinese Chem Lett, 1999, 10(6): 443-444

[2] QianDong, HeHou-qun, WangKai-yi. Study on synthesis of 2, 3, 5-trimethylhydroquinone by direct oxidation[J]. Chemical Reagents, 2002, 24(4): 231-232(in Chinese)

[3] Michelet D, Razoutz M. Process for the Preparation of Trimethyl-para-benzaquinone[P]. US 3927045. 1975 - 12 - 16.

[4] Kawaguchi T, Nishida T, Ohmura Y, et al. Process for Preparing of 2, 3, 5-trimethylhydroquinone[P]. US 3842130. 1974 - 10 - 15.

[5] QianDong, WangKai-yi, YangLi-yi, et al.. Studies on the continuous process for synthesizing 2, 3, 5-trimethylhydroquinone over Pd/Al₂O₃ catalyst [J]. J Cent South Univ Technol(Natural Science), 1998, 29(5): 502-504(in Chinese)

[6] YANG Li-yi, ZHANG Mou-kun, QIAN Dong, et al. Studies on the continuous process for synthesizing 2, 3, 5-trimethylhydroquinone with Pt/Al₂O₃ catalyst [J]. Speciality Petrochemicals, 1998(5): 27–29. (in Chinese)

[7] QianDong, WangKai-yi, YangLi-yi, et al.. The continuous process for synthesizing 2, 3, 5-trimethyl-hydroquinone over Pd/Al₂O₃ catalyst (II)[J]. J Cent South Univ Technol(Natural Science), 2000, 31(1): 41-43(in Chinese)

[8] YangLi-yi, QianDong, ZhangMou-kun, et al.. Synthesis of 2, 3, 5-trimethylhydroquinone with bimetallic catalysts[J]. Petrochemical Technology & Application, 2000, 18(2): 68-69(in Chinese)

[9] QianDong, TangCheng-guo, YangLi-yi, et al.. Synthesis of 2, 3, 5-trimethylhydroquinone and factors influencing its quality[J]. Chemical Reagents, 2001, 23(5): 265-307(in Chinese)

[10] QianDongStudies on the Process for Preparation of 2, 3, 5-trimethylhydroquinone and Catalysts[D], 1999, Changsha, Central South University of Technology(in Chinese)

[11] Yui T, Ito A. Process for Preparation of 2, 3, 5-trimethylhydroquinone[P]. US 4769500. 1988 - 09 - 06.

[12] HughesRDeactivation of Catalysts[M]. DING Fuxin. YUAN Nai-ju, tranl, 1990, Beijing, Science Press: 7-9(in Chinese)