A double five-ring silicate has been identified for the first time in the ZSM-5 synthesis mixture using 29Si n.m.r., attenuated total reflection Fourier transform-infrared spectroscopy, and mass spectrometry; a redistribution of the silicate species present in the solution phase has been observed after the addition of organic solvents to the ZSM-5 synthesis mixture.

A flow calorimeter has been developed for measuring enthalpy-temperature curves of condensable gases. Measurements can be carried out over small temperature intervals and at low temperatures and high pressures. Rather low mass flow rates are used so that recirculation of the sample is unnecessary. A correction for heat losses is made. The absolute error of the final results is within 1 %.

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