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Citation: Wang Jue, Zhao Bi-Ying, Xie You-Chang. Correlations between the Dispersion State of M and Catalytic Behavior of[J]. Acta Physico-Chimica Sinica, ;2001, 17(11): 966-971. doi: 10.3866/PKU.WHXB20011102 shu

Correlations between the Dispersion State of M and Catalytic Behavior of

1.
Institute of Physical Chemistry,Peking University,Beijing　100871

Received Date: 11 April 2001
Available Online: 15 November 2001

Two series of M /HZSM-5 catalysts were prepared by impregnating HZSM-5 with solution of Mg(NO3)2 and Mg(CH3COO)2.The structures of the samples were characterized by XRD and XPS,and the acidity was determined by NH3-TPD.The catalytic behavior of M /HZSM-5 in the reaction of toluene methylation was investigated on a continuous flow micro-apparatus under atmospheric pressure.It was found that the dispersion of M was related to the precursor of M and had an important effect on the behavior of M /HZSM-5 catalyst.M disperses both on the internal surface and on the external surface of HZSM-5 in the catalysts prepared with Mg(NO3)2 as the precursor of M ,therefore the para-selectivity of the catalyst is higher and the activity is lower.However M mainly deposits on the external surface of HZSM-5 in the catalysts prepared with Mg(CH3COO)2,and the activity of catalysts is higher and the para-selectivity is lower.By secondary impregnation and hydrothermal treatment M /HZSM-5 catalyst with relatively high activity and high para-selectivity was obtained.
- Shape-selectivity;Surface modification;Toluene methylation;HZSM-5;M
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