Modified alkali metal nanotitanates for hydrogen sulfide adsorption
a technology of hydrogen sulfide adsorption and which is applied in the field of new modified alkali metal nanotitanates, can solve the problems of hsub>2/sub>s negatively affecting the ceramic membrane used in syngas separation, damage equipment, and severe pipeline corrosion
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example 1
Preparation of Adsorbents
[0042]This example describes the preparation of three embodiments of the adsorbent using ETS-2, ETS-4 and ETS-10, respectively.
[0043]ETS-2, ETS-4 and ETS-10 were hydrothermally synthesized in accordance with the method disclosed in U.S. Pat. No. 4,853,202. In general, the method involves the following steps: preparing a reaction mixture of a titanium source, a silica source, an alkaline source, water, and optionally an alkali metal fluoride, with a certain range of mole ratios; heating the reaction mixture; allowing crystal formation; and separating, washing, and drying the crystalline ETS product. The silica source was sodium silicate (28.7% SiO2, 8.9% Na2O) for each of ETS-2, ETS-4 and ETS-10. The titanium source was solid titanium (iii) oxide (Ti2O3) for ETS-2, and solubilized titanium (iii) chloride TiCl3 for ETS-4 and ETS-10.
[0044]Copper (II) nitrate (Cu(NO3)2) salt was added to water to create an aqueous copper nitrate solution in three separate vessel...
example 2
Comparison of Adsorbent Performance
[0047]This example describes testing of the adsorbent performance of the samples prepared as described in Example 1. The following testing procedure was followed separately with respect to each of the adsorbents.
[0048]A 50 mg sample of the pelletized adsorbent was packed between glass wool plugs in a stainless steel column having a length of 4 cm and an inside diameter of 0.38 cm to form an adsorbent bed within the column. The adsorbents were activated at a temperature of 100° C. The outlet of the column was connected to a gas chromatograph equipped with an column (Restek Corporation™ MXT®-1) having a length of 60 m and an internal diameter of 0.53 mm and a flame photometric detector (FPD) (SRI Instruments™) able to detect H2S at concentrations of 200 ppb. N2 gas with 10 ppm H2S was continuously flowed through the adsorbent at a rate of 100 mL per minute, as controlled by needle valves and as measured using a bubble flow meter. It was noted that th...
example 3
Comparison of Cu-ETS-2 and R3-11G Performance in Humidity
[0052]This example compares the effect of humidity on the performance of Cu-ETS-2 and R3-11G. Cu-ETS-2 and R3-11G were exposed to H2S at an inlet concentration of 10 ppm, at ambient temperature, and a relative humidity of 45 percent. FIG. 2 shows the H2S breakthrough capacity per gram of adsorbent, and FIG. 3 shows the copper utilization rate calculated on a mole / mole basis, under these conditions. The Cu-ETS-2 adsorbent exhibits a higher breakthrough capacity than R3-11G, which corresponds to an approximately four-times higher copper utilization rate than R3-11G. In view of the results in Table 4, the performance of Cu-ETS-2 in terms of copper utilization rate is relatively less sensitive to humidity, than the performance of R3-11G.
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