Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

KINETICS OF n-BUTANE CONVERSION OVER SULFATEDMORDENITE-ZIRCONIA CATALYSTD.B. Tagiyev, R.V. StarikovPP-I-28Institute of Petrochemical Processes of National Academy of Sciences of Azerbaijan, Baku30, Khojaly ave., Аz1025, Baku, Azerbaijan, e-mail: dtagiyev@hotmail.comIntroductionIt has been shown in publications [1, 2] that promotion of dealuminated mordenite byzirconia and sulfate-ions results in a considerable increasing of zeolite isomerizing activityand allows to perform isomerization of n-butane at lower temperatures. The results ofinvestigation of kinetic regularities of the process essential for understanding of actionmechanism of sulfated mordenite-zirconia catalysts in n-butane isomerization are presented inthe given paper.ExperimentalThe kinetics study of reaction was carried out in a flow microreactor at 0.1MPa pressureand temperature range 473-513 K. Before testing a catalyst was heated in a dry air stream at773 K for 3 hours. Partial pressures of n-butane and hydrogen were varied in the range 0.01-0.08 and 0.01-0.04 MPa, respectively. For ensuring of velocity constancy of gas streamnitrogen was used as an inert diluent. The products of reaction were analyzed by gaschromatography method.Results and discussionThe dependences of main products formation velocities of n-butane conversion(isobutane, isopentane, propane) on partial pressures of reactants were determined at moderateconversion of n-butane, i.e. in the range of pseudo zeroth order of reaction. The obtainedresults are presented in Table 1 at temperature of 473 K.Table 1. Influence of reactants partial pressures on n-butane conversion and reaction rate(temperature – 473 K, stream rate – 500 ml·h –1 )Partial pressures, MPa Conversion ofReaction rate, W i·10 4 –1mole·g–1·hP n-C4H10 P H2n-butane, %isobutane isopentane propane0.01 0.01 2.6 0.28 0.04 0.030.02 0.01 2.9 0.67 0.09 0.060.04 0.01 3.2 1.41 0.23 0.170.06 0.01 3.7 2.46 0.35 0.270.08 0.01 5.1 4.58 0.70 0.470.01 0.02 1.9 0.21 0.03 0.020.01 0.04 1.4 0.15 0.02 0.01261