Catalyst surface-characteristic comprehensive measuring device and application thereof
A technology of surface properties and catalysts, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as difficulties, time-consuming, and large errors, and achieve the effect of simple structure, convenient operation, and small errors
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Embodiment 1
[0189] use as figure 1 The apparatus shown, performs TPR tests on Cu-containing hydrotalcite-like catalysts.
[0190] 1). Take 0.2g of Cu-containing hydrotalcite that has been calcined, and use reducing gas H 2 account for H 2 -5% of He gas mixture (total flow rate of gas mixture: 50ml / min);
[0191] 2). After the baseline becomes stable, perform temperature-programmed reduction at a heating rate of 10°C / min. Its TPR spectrum is figure 2 .
[0192] As a comparison, the TPR test of CuO was done.
[0193] 1). Take 0.04g of dry CuO, reducing gas H 2 account for H 2 -5% of He gas mixture (total flow rate of gas mixture: 50ml / min);
[0194] 2). After the baseline becomes stable, perform temperature-programmed reduction at a heating rate of 10°C / min. Its TPR spectrum is image 3 .
[0195] It can be seen from the figure that the TPR spectra of the Cu-containing hydrotalcite-like catalyst and CuO both have only one spectrum peak. The highest peak temperature of the former...
Embodiment 2
[0197] use as figure 1 The instrument shown, performs TPD testing on iron oxide catalysts.
[0198] 1) Iron trioxide catalyst 0.8g, reducing gas H 2 account for H 2 -5% of He mixed gas (total flow rate of mixed gas: 50ml / min); reduce at 450°C for 2h; then, close He, 2 (30ml / min), cool to room temperature (27°C).
[0199] 2) Close H 2 , turn on He (30ml / min) to purge to remove reversibly adsorbed H 2 , after the baseline becomes stable, conduct H at a rate of 25°C / min 2 desorption.
[0200] The direction of the peak can be adjusted by selecting the "positive\negative" switch of the detector. See TPD Spectrum Figure 4 .
[0201] Depend on Figure 4 It can be seen that the catalyst has only one broadened desorption peak, indicating that the energy distribution on the catalyst surface is relatively uniform; the highest peak temperature is 296 ° C, indicating that the H absorption 2 The active center is medium strength.
Embodiment 3
[0203] use as figure 1 The instrument shown, performs TPD tests on molybdenum-containing molecular sieve catalysts.
[0204] 1) Take 0.2 g of the catalyst that has been calcined at a high temperature, put it into the sample tube, purify it with He at 400 ° C for 1 h, and then cool it to 120 ° C. After the temperature is constant, use He to pass the NH 3 Vapor is introduced into the sample tube for adsorption.
[0205] 2) He (40ml / min) as carrier gas, purge to remove reversibly adsorbed NH 3 , after the baseline stabilized, the temperature-programmed desorption was performed at a rate of 10°C / min. See TPD Spectrum Figure 5 .
[0206] The spectrum shows that there are at least three kinds of adsorption centers on the surface of the catalyst (the highest peak temperature: 242°C, 325°C, 472°C), and the energy distribution on the surface is uneven, and the weak acid centers are the main ones.
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