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지지체에 따른 아연계 탈황제의 특성

The Characterization of Zn-based Desulfurization Sorbents on Various Supports

강석찬 전희권 이태진¹ 류시옥¹ 김재창^†

Seok Chan Kang Hee Kwon Jun Tae Jin Lee¹ Si Ok Ryu¹ Jae Chang Kim^†

경북대학교 공과대학 화학공학과, 대구 702-701 ¹영남대학교 공과대학 화학공학과, 경산 712-749

Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea ¹Department of Chemical Engineering, Yeungnam University, Kyongsan 712-749, Korea

kjchang@bh.knu.ac.kr

HWAHAK KONGHAK, June 2002, 40(3), 289-297(9), NONE

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Abstract

여러가지 지지체(TiO2, SiO2, Al2O3)를 이용한 아연계 탈황제가 전처리 조건에 따라 제조되었고 고정층 반응기를 이용한 황화 수소 제거 능력 및 반복 실험에 따른 비 활성화가 중온(탈황 온도: 480 ℃, 재생 온도: 580 ℃) 및 고온(탈황 온도: 650 ℃, 재생 온도: 800 ℃) 실험 조건에서 실시되었다. 탈황제의 제거 능력 및 내구성은 아연 산화물의 상태에 따라 크게 변화하였는데 지지체는 비록 직접적인 황화 수소에 활성은 없었으나 이러한 아연 산화물의 물리, 화학적 상태에 크게 영향을 미치고 있었다. 800 ℃에서 전처리된 알루미나 지지체를 이용한 아연계 탈황제가 가장 우수한 탈황제로 선정되었는데, 이 탈황제는 고온 및 중온에서의 반복되는 탈황, 재생 반응 전, 후에 물리적인 변화가 관찰되지 않았으며 활성점으로 판단되는 아연 산화물은 알루미나와 새로운 복합 산화물을 형성하지 않고 분리되거나 도포된 독립상을 형성하고 있었다.

Zinc-based desulfurization sorbents supported on TiO2, SiO2 and Al2O3 and modified by treatment at various temperatures were prepared. Their sulfur removing capacities in a fixed-bed reactor and characteristics of their physical and chemical properties were tested during multiple cycles of sulfidation/regeneration. The best sorbent with high sulfur removing capacity and resistance to the deactivation at high and middle temperature was the alumina supported sorbent pretreated at 800 ℃. The active species was the zinc oxide phase coated on the external surface of the alumina support without forming the spinel structure of zinc-aluminate and the change in the physical properties was not found during repeated sulfidation and regeneration.

Keywords

Zinc Based Desulfurization Sorbents Sulfur Removing Capacity Alumina Support

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