Thermogravimetric analyzer curve

Thermogravimetry (TG) data were obtained on the NH4+- and H30+-exchanged ZSM-5 samples, as well as on a separately prepared NH -exchanged sample of similar composition, for confirmation purposes. A duPont Model 951 thermogravimetric analyzer was used in conjunction with a Model 990 Recorder-Controller. The TG curves were obtained on approximately 25 mg samples, at a heating rate of 10°C per minute, and under flowing air at a rate of 38 cnP per minute. 

Powder X-ray diffraction (XRD) patterns of the samples were carried out on a Rigaku RTP300-RC X-ray diffractometer with Cu Ka ( =1.541 SA) radiation. Infrared spectra (IR) were recorded by the KBr method on a Perkin-Elmer 1600 Series FTIR infrared spectrometer. Thermogravimetric (TG) and differential thermal analysis (DTA) curves were obtained at a heating rate of 10°C/min in air on a Seiko SSC5200 thermal analyzer. Scanning electron microscopy (SEM) was performed on a Hitachi S-530 scanning electron microscope. 

X-ray diffraction patterns were recorded on a Siemens D5000 diffractometer using CuKa radiation. Thermogravimetric and differential thermal analysis curves were recorded on a Setaram Setsys 12 thermal analysis station by heating in an argon atmosphere from 25 to 1200 -C at a rate of 5 min". Samples were used untreated. The Pt content was determined by the Service Central d Analyse, CNRS (Vernaison, France) and the microanalyses (C, H) were performed at Complutense University (Madrid, Spain). Na isotherms were determined on a Micromeritics ASAP 2000 analyzer. H MAS NMR, Si MAS NMR and C CP MAS NMR spectra were recorded at 400.13, 79.49 and 100.61 MHz, respectively, on a Broker ACP-400 spectrometer at room temperature. An overall 1000 free induction decays were accumulated. The excitation pulse and recycle time for H MAS NMR spectra were 5 ps and 3 s, respectively, those for Si MAS NMR spectra 6 ps and 60 s and those for C CP MAS NMR spectra 6 ps and 2 s. Chemical shifts were measured relative to a tetramethylsilane standard. Prior to measurement, if necessary, samples were dehydrated in a stove at 423 K for 24 h. 

Tdec), the temperatures for maximum degradation rate (Tmax), and char yield at 545 °C (CY) measured using the thermogravimetric analyses (TGA), and by the Tg measured using a thermomechanical analyzer (TMA) with a penetration probe. Tdec is noted as the point where the extrapolations of the two slopes in the TGA curve intersect. The Tg was measured using a thermomechanical analyzer (TMA) with a penetration probe. 

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