Non-oxidative Dehydro-aromatization of Methane over Strong Acid-promoted W/HZSM-5-based Catalysts

Abstract

Abstract: Highly active and heat-resisting strong acid-promoted W/HZSM-5-based catalysts, W-Zn (La, Nb)-H₂SO₄/HZSM-5, for non-oxidative dehydro-aromatization of methane have been developed. Over a W-Zn-H₂SO₄/HZSM-5 catalyst and under the reaction conditions of 1123 K, 0. 1 MPa, and GHSV=1500 mL/h per gram cat., methane conversion (XCH₄) reached 23%, with a selectivity to benzene at 97% and an amount of coking for 3 h operation at 0. 02% of the weight of the catalyst used. During a stability test at 1073 Kfor 3 h, XCH₄ had been maintaind at about 21.5% over the W-Zn-H₂SO₄/HZSM-5 catalyst,whereas dropped gradually to 13% from 19% in the initial stage over the Mo-Zn-H₂SO₄/HZSM-5, demonstrating that the former has a better heat-resisting peculiarity than the latter. The results of investigation of optimization of the catalyst composition showed that the optimal W-loading on the HZSM-5[n-(Si)/n-(Al)=38] zeolite support was about 2.5%, and that an optimal match-ratio existed among the Wand the promoters, Zn (or La or Nb) and H₂SO₄. The experimental results also indicated that the promoting effects of Zn and La were more pronounced than Nb.

Key words: Methane, Dehydro-aromatizatlon, W-Zn (La, Nb)-H₂SO₄/HZSM-5 catalysts, Aromatic hydrocarbons

CLC Number:

O643.38

TrendMD:

ZENG Jin-Long, XIONG Zhi-Tao, LIN Guo-Dong, ZHANG Hong-Bin . Non-oxidative Dehydro-aromatization of Methane over Strong Acid-promoted W/HZSM-5-based Catalysts[J]. Chem. J. Chinese Universities, 1998, 19(1): 123.

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Non-oxidative Dehydro-aromatization of Methane over Strong Acid-promoted W/HZSM-5-based Catalysts

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