γ-Al₂O₃, TiO₂, SiO₂와 NaY에 란타늄을 함침시켜 촉매를 제조하고, 고정층 미분반응기에서 CO에 의한 SO₂ 환원반응특성을 연구하였다. 이때 온도는 350-550℃ 영역에서, SO₂ 농도는 1,000-10,000 ppm [CO]/[SO₂] 몰비를 1.0-3.0 공간속도를 4,000-12,000 h^-1의 범위에서 조절하고 대기압 하에서 SO₂ 전환율과 반응선택성을 조사하였다. γ-Al₂O₃가 란타늄 담체로 우수한 특성을 나타내었으며, 10wt% 란타늄을 γ-Al₂O₃에 함침시켜 제조한 촉매는 450℃ 이상에서 95% 이상의 높은 SO₂ 전환율과 3% 이하의 COS 수율로 좋은 선택성을 나타내었다. [CO]/[SO₂] 의 몰비는 양론비인 2.0이 적당한 것으로 나타났으며 [CO]/[SO₂] 몰비가 2.0보다 큰 경우는 SO₂ 전환율은 증가하였으나 대부분의 생성물이 COS로 나타났다. 실험조건 영역에서의 공간속도나 SO₂ 농도의 변화는 SO₂ 전환율과 반응선택성에 큰 영향을 미치지 않았다. 활성화된 후의 란타늄은 La₂O₂S와 La₂O₂S₂의 황화물 혼합상태로 존재하였으며, 반응 후에도 상변화는 관찰되지 않았다.

The reduction of SO₂ by CO over supported lanthanum catalysts was studied at the temperature range of 350-550℃, with intial SO₂ concentration of 1,000-10,000 ppm, [CO]/[SO₂] molar ratio of 1.0-3.0 and space velocity of 4,000-12,000 h^-1. We used γ-Al₂O₃, TiO₂, SiO₂ and NaY as the lanthanum carrier. We investigated the reaction activity and selectivity using a differential fixed bed reactor at atmospheric pressure. Results showed that γ-Al₂O₃ is the most effective carrier for the lanthanum catalyst. Over the catalyst prepared by impregnating to γ-Al₂O₃ with 10wt% lanthanum, SO₂ conversion of higher than 95% and COS yield of lower than 3% were obtained at temperatures above 450℃. The optimum [CO]/[SO₂] molar ratio was found to be 2.0. At the [CO]/[SO₂]molar ratios higher than 2.0, the SO₂ conversion was highly increased but the main product was COS. The variation of SO₂ concentrations and space velocity in the experimental range did not affect appreciably on SO₂ conversion and COS yield. X-ray diffraction results revealed that mixtures of La₂O₂S and La₂O₂S₂ was observed after activation, and that the crystal phases were unchanged after reaction.

Sulfur Dioxide Carbon Monoxide Reduction Lanthanum

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