Abstract:
본 발명은 합성가스로부터 액체 탄화수소를 제조하는 피셔-트롭쉬 합성(Fischer-Tropsch synthesis ; FTS) 반응에 이용되는 촉매로 Al 2 O 3 -SiC 지지체에 코발트 전구체를 담지시켜 제조되는 코발트 담지촉매의 제조방법에 관한 것으로, 더욱 상세하게는 실리콘카바이드(silicon carbide, SiC)를 알콕시실란 화합물으로 미리 전처리하여 메조포러스한 기공을 형성시킨 후에 졸-겔법에 의해 알루미나(Al 2 O 3 ) 코팅하여 제조된 Al 2 O 3 -SiC 지지체상에 활성 성분으로서 코발트를 담지시켜 피셔-트롭쉬 합성용 코발트 담지촉매를 제조하는 방법에 관한 것이다. 본 발명의 코발트 담지촉매는 Al 2 O 3 -SiC 지지체의 비표면적이 크게 향상되면서 활성성분인 코발트의 분산성 증대 및 C 5 + 탄화수소 화합물의 선택성을 향상시키는 효과를 나타낸다.
Abstract:
The present invention relates to a method of fabricating a supported cobalt catalyst fabricated by carrying a cobalt precursor in a Al_2O_3-SiC support as a catalyst used for a Fisher-Tropsch synthesis (FTS) which produces a liquid hydrocarbon from a synthetic gas and, more specifically, to a method of fabricating a supported cobalt catalyst for an FTS including: preprocessing a silicon carbide (SiC) with an alkoxysilane compound in advance to form mesoporous pores in the silicon carbide; and then carrying a cobalt as an active ingredient on an Al_2O_3-SiC support produced by coating the silicon carbide with an alumina (Al_2O_3) by a sol-gel process. According to the present invention, since a specific surface area of an Al_2O_3-SiC support is increased significantly, the effects of the dispersibility of the cobalt as an active ingredient is increased, and selectivity of a hydrocarbon compound C5+ improved.
Abstract:
The present invention relates to a catalyst having a core-shell structure for a mixed reforming reaction and to a method for producing the same. The method of the present invention comprises the steps of: preparing an alumina support in which organic acid is treated by adding, dipping, and drying the alumina support in a solvent in which organic acid is dissolved; and producing a nickel-alumina catalyst of a core-shell structure by adding, dipping, and drying the alumina support in a solvent in which a nickel precursor is dissolved. The nickel-alumina catalyst having a core-shell structure for a mixed reforming reaction includes organic acid in alumina support pores by treating the alumina support using organic acid of pKa 3.5 or less, so that a core-shell structure is easily formed and nickel which is an active ingredient can be evenly distributed on the surface of the support. Moreover, the catalyst has the core-shell structure having the surface on which nickel is evenly distributed, so that the catalyst has high stability and excellent reaction activities not only under general conditions but also in high spatial speed conditions. The sintering of nickel occurring in a partially heated catalyst is controlled so that the inactivation of the catalyst is inhibited.
Abstract:
본 발명은 유기산이 용해된 용매에 알루미나 지지체를 첨가하고 함침 및 건조하여 유기산이 처리된 알루미나 지지체를 제조하는 단계; 및 상기 알루미나 지지체를 니켈 전구체가 용해된 용매에 첨가하고 함침 및 건조하여 코어-셀 구조의 니켈-알루미나 촉매를 제조하는 단계를 통하여 제조된 코어-셀 구조의 혼합개질 반응용 촉매 및 이의 제조방법에 관한 것이다. 이에 따른, 코어-셀 구조의 혼합개질 반응용 니켈-알루미나 촉매는 pKa 3.5 이하의 유기산으로 알루미나 지지체를 처리하여 알루미나 지지체 기공에 유기산을 포함함으로써 코어-셀 구조를 용이하게 형성하여 지지체 표면에 활성 성분인 니켈이 고르게 분포된 촉매를 제조할 수 있다. 또한, 상기 촉매는 표면에 니켈이 고르게 분포되어 있는 코어-셀 구조를 가짐으로써 일반 조건은 물론 높은 공간속도의 조건에서도 안정성이 높아 반응 활성이 우수하며, 국부적으로 가열된 촉매 내부에서 일어나는 니켈의 소결 현상을 억제함으로써 촉매의 비활성화를 억제하는 효과가 있다.
Abstract:
The present invention relates to a catalyst with a core-shell structure for mixed reforming reaction manufactured by the steps of: manufacturing an alumina support treated with an organic acid by adding an alumina support to a solvent which carries an organic acid dissolved therein and impregnating and drying the alumina support; and manufacturing a nickel-alumina catalyst with a core-shell structure by adding the alumina support to a solvent which carries nickel precursors dissolved therein and impregnating and drying the alumina support. In addition, the present invention relates to a manufacturing method thereof. Accordingly, the catalyst having an active component of nickel distributed evenly on the surface of the support can be manufactured as the nickel-alumina catalyst with a core-shell structure for mixed reforming reaction includes the organic acid in the pores of the alumina support thanks to the alumina support treated with an organic acid with a pKa of 3.5 or lower, thereby forming the core-shell structure easily. Also, the catalyst has high stability not only under general conditions but also under the conditions of high spatial speed, thereby having high reaction activity as the catalyst has the core-shell structure of nickel distributed evenly on the surface of the catalyst. In addition, the inactivation of the catalyst is inhibited by inhibiting the sintering of nickel, which is generated inside a locally heated catalyst.
Abstract:
The present invention relates to a bimodal porous Co/Al_2O_3/SiC catalyst for Fischer-Tropsch reaction using an Al_2O_3/SiC support, which is manufactured by coating silicon carbide (SiC) having excellent thermoconductivity with alumina, as a catalyst having excellent heat and material transfer, and having cobalt (Co) supported as an active component; and a manufacturing method thereof. The present invention relates to a method for improving a stability of the catalyst and for increasing a conversion rate of syngas (carbon monoxide and hydrogen) by using the Al_2O_3/SiC support to enhance the dispersion of cobalt and interaction between the cobalt and the support, which inhibits a generation of cokes (filament carbon). [Reference numerals] (AA) Comparative example 1; (BB) Example 1