Sulfur Recovery Daily Question 2018.12.5
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What are the technical requirements for the Al2O3-based CLAUS reaction catalyst CT6-2B? Answer: ① Shape: φ4–6 mm, white spherical. ②Main chemical composition (wt%): Al2O3 > 95 ； Fe2O3≤0.05 ； SiO2≤0.04 ； Na2O at 1000–2500 PPm ； ③Loss on ignition (wt%): <4.0. ④Physical properties: Bulk density (kg/L): 0.65–0.75 ； Specific surface area: >290 (m2/g) (low-temperature nitrogen adsorption method) or ≥230 (m2/g) (methanol adsorption method) ； Pore volume: ≥0.40 (ml/g) ； Wear rate: <0.6% (m/m); average compressive strength: ≥160 (N/piece). ⑤Air speed (h-1): 1500 h-1 (operating condition)
①Shape: φ4–6 mm, brown spherical. ②Main chemical composition (wt%): Al2O3 > 95 ； Fe2O3≤0.05 ； SiO2≤0.04 ； Na2O at 1000–2500 PPm ； ③Loss on ignition (wt%): <4.0. ④Physical properties: Bulk density (kg/L): 0.65–0.75 ； Specific surface area: >290 (m2/g) (low-temperature nitrogen adsorption method) or ≥230 (m2/g) (methanol adsorption method) ； Pore volume: ≥0.40 (ml/g) ； Wear rate: <0.6% (m/m); average compressive strength: ≥160 (N/piece). ⑤Air velocity (h-1): 1500 h-1 (under operating conditions). Aluminum oxide (Al2O3): Industrial Al2O3 is produced from bauxite (Al2O3▪3H2O) and gibbsite; for Al2O3 with high purity requirements, chemical methods are generally used for its production. Al2O3 has many polymorphs; over 10 are known to date, with mainly three crystal forms, namely γ-Al2O3, β-Al2O3, and α-Al2O3. Among them, those with different structures have different properties; at high temperatures above 1300°C, they almost completely transform into α-Al2O3. Alumina is produced by chemically treating bauxite raw material to remove oxides of elements such as silicon, iron, and titanium; it is a high-purity alumina material with an Al₂O₃ content of generally over 99%. The mineralogical composition consists of 40%–76% γ-Al₂O₃ and 24%–60% α-Al₂O₃. γ-Al₂O₃ can be transformed into α-Al₂O₃ (corundum) at 950–1200°C, accompanied by significant volume contraction.
4–6 mm, white and spherical. wt%) Al2O3 > 95 ； Fe2O3≤0.05 ； SiO2≤0.04 ； N a2O at 1000–2500 PPm③ Loss on ignition (wt%): <4.0. kg/L): 0.65～0.75 ； Specific surface area: >290 (m2/g) (low-temperature nitrogen adsorption method) or ≥230 (m2/g) (methanol adsorption method) ； Pore volume: ≥0.40 (ml/g) ； Wear rate: <0.6% (m/m); average crushing strength 160 (N per particle). h-1): 1500 h-1 (operating condition)
4–6 mm, white and spherical. wt%) Al2O3 > 95 ； Fe2O3≤0.05 ； SiO2≤0.04 ； N a2O at 1000–2500 PPm③ Loss on ignition (wt%): <4.0. kg/L): 0.65～0.75 ； Specific surface area: >290 (m2/g) (low-temperature nitrogen adsorption method) or ≥230 (m2/g) (methanol adsorption method) ； Pore volume: ≥0.40 (ml/g) ； Wear rate: <0.6% (m/m); average crushing strength 160 (N per particle). h-1): 1500 h-1 (operating condition)
4–6 mm, white and spherical. wt%) Al2O3 > 95 ； Fe2O3≤0.05 ； SiO2≤0.04 ； N a2O at 1000–2500 PPm③ Loss on ignition (wt%): <4.0. kg/L): 0.65～0.75 ； Specific surface area: >290 (m2/g) (low-temperature nitrogen adsorption method) or ≥230 (m2/g) (methanol adsorption method) ； Pore volume: ≥0.40 (ml/g) ； Wear rate: <0.6% (m/m); average crushing strength 160 (N per particle). h-1): 1500 h-1 (operating condition)