KR101828791B1 - 개질반응용 내열성 개선 모노리스 촉매 - Google Patents
개질반응용 내열성 개선 모노리스 촉매 Download PDFInfo
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Abstract
Description
도 2는 본 발명에 따른 모노리스 촉매에 대한 탄소침적과 입자 성장이 억제되는 형태를 보여주는 모식도이다.
도 3은 본 발명의 실시예에서 C-R-Z 촉매에 1A~5A족 금속 중 Al 입자를 첨가한 경우 Zr에 대한 Al의 함량 변화에 따른 C-R-Z-A 촉매의 내열성 변화의 관찰 결과를 보여주는 그래프이다.
도 4는 본 발명의 실시예 3과 비교예 1에 따른 촉매에 대한 열처리 후 CRZ 성분의 분산도를 비교하여 나타낸 것이다.
구분 | 성분 및 조성비 | 열처리 후 CO cumulative quantity (cm3/g) |
열처리 후 Metal dispersion (%) |
|
Y (mol%) | ||||
Zr | Al | |||
실시예 1 | 1.78 | 16.02 | 0.134 | 0.052 |
실시예 2 | 4.45 | 13.35 | 0.215 | 0.080 |
실시예 3 | 8.90 | 8.90 | 0.272 | 0.101 |
실시예 4 | 13.35 | 4.45 | 0.168 | 0.062 |
실시예 5 | 16.02 | 1.78 | 0.104 | 0.041 |
비교예 1 | 17.8 | 0 | 0.022 | 0.007 |
화학식 1의 a(X)-b(Y) X는 Co와 Ru의 혼합성분으로 그 비율은 X와 Y성분의 전체합에 대하여 각각 81.8, 0.4 mol% 이며, 모노리스 담체에 X와 Y성분 전체가 0.9 wt% 가 되도록 담지 한다. |
20 - 배리어(Al) 입자
30 - 침적 탄소
Claims (10)
- 모노리스 촉매 지지체에 하기 화학식 1로 표시되는 활성 성분과 3A족 금속 배리어 성분이 함유되어 있되 모노리스 촉매 100 중량부에 대해 하기 화학식 1의 성분이 0.5-10 중량부로 함유되어 있는 것을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매:
[화학식 1]
a(X)-b(Y)
상기 화학식 1에서, X는 Co를 포함하고 여기에 Ni, Ru, Rh 또는 이들 중에서 선택된 하나 이상이 혼합되어 2 이상의 혼합물로 이루어진 촉매 활성 성분이고, Y는 조촉매인 Zr과 배리어 성분인 3A족 금속이 1 : 0.1-10의 중량비로 혼합된 것이고, a 및 b 각각은 X와 Y의 중량비를 순서대로 나타내며, a는 1이고, b는 0.2 내지 1.5이다.
- 청구항 1에 있어서, Y는 Zr과 3A족 금속이 1 : 0.3-5.0의 중량비로 혼합된 배리어 성분인 것을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매.
- 청구항 1에 있어서, 3A족 금속 배리어 입자는 Al, Ga, In 중에서 선택된 하나 이상의 성분을 포함하는 것을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매.
- 청구항 1 내지 청구항 3 중에서 어느 하나의 항에 있어서, 3A족 금속은 금속또는 금속산화물 형태로 촉매 활성성분과 분리된 상태로 존재하는 것을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매.
- 청구항 1에 있어서, 모노리스 지지체는 비표면적이 10 m2/g 이하인 세라믹, 실리콘 카바이드 또는 금속 성분으로 이루어진 것을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매.
- 하기 화학식 1의 조성비와 일치하도록 금속전구체 용액을 혼합하는 단계;
활성 금속 전구체 및 배리어 성분 전구체를 계면활성제, 유기용매 및 물 중에서 하나 이상을 사용하여 활성 성분과 배리어 성분이 분리될 수 있도록 하는 단계;
상기 혼합된 금속전구체 용액을 모노리스 지지체에 코팅시키는 단계;
상기 금속전구체 용액이 코팅된 모노리스 지지체를 건조시키는 단계; 및
상기 건조된 모노리스 지지체를 고온 소성시키는 단계;
를 포함하는 개질반응용 모노리스 촉매의 제조방법:
[화학식 1]
a(X)-b(Y)
상기 화학식 1에서, X는 Co를 포함하고 여기에 Ni, Ru, Rh 또는 이들 중에서 선택된 하나 이상이 혼합되어 2 이상의 혼합물로 이루어진 촉매 활성 성분이고, Y는 조촉매인 Zr과 배리어 성분인 3A족 금속이 1 : 0.1-10의 중량비로 혼합된 것이고, a 및 b 각각은 X와 Y의 중량비를 순서대로 나타내며, a는 1이고, b는 0.2 내지 1.5이다.
- 하기 화학식 1의 조성비와 일치하도록 금속전구체 용액을 혼합하는 단계;
활성 금속 전구체 및 배리어 성분 전구체를 계면활성제, 유기용매 및 물 또는 이중 하나 이상을 사용하여 활성 성분과 배리어 성분이 분리될 수 있도록 하는 단계;
상기 혼합된 금속전구체 용액을 모노리스 지지체에 코팅시키는 단계;
상기 금속전구체 용액이 코팅된 모노리스 지지체를 건조시키는 단계; 및
상기 건조된 모노리스 지지체를 고온 소성시키는 단계;
상기 전 과정 또는 일부 과정을 반복하면서 활성 금속 및 배리어 성분을 추가하여 하기 화학식 1의 조성비에 해당하는 촉매가 담지되도록 하는 단계;
를 포함하는 개질반응용 내열성 개선 모노리스 촉매의 제조방법:
[화학식 1]
a(X)-b(Y)
상기 화학식 1에서, X는 Co를 포함하고 여기에 Ni, Ru, Rh 또는 이들 중에서 선택된 하나 이상이 혼합되어 2 이상의 혼합물로 이루어진 촉매 활성 성분이고, Y는 조촉매인 Zr과 배리어 성분인 3A족 금속이 1 : 0.1-10의 중량비로 혼합된 것이고, a 및 b 각각은 X와 Y의 중량비를 순서대로 나타내며, a는 1이고, b는 0.2 내지 1.5이다.
- 청구항 6 또는 청구항 7에 있어서, 3A족 금속 배리어 전구체는 염 형태의 화합물인 것을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매의 제조방법.
- 청구항 6 또는 청구항 7에 있어서, 고온 소성시키는 단계에서 고온 소성은 300-900℃에서 4-12시간 소성하는 것을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매의 제조방법.
- 청구항 7에 있어서, 활성 금속 전구체 및 배리어 성분 전구체를 계면활성제, 유기용매 및 물 중에서 선택된 하나 이상을 사용하여 활성 성분과 배리어 성분이 분리될 수 있도록 하는 단계와 그 이하의 단계는, 저농도의 활성 금속 전구체 용액을 모노리스 지지체에 코팅하고 건조 및 소성 단계를 거친 후 배리어 전구체 용액을 촉매가 코팅된 모노리스에 재 코팅, 건조, 소성을 수행하여 촉매 활성 성분과 배리어 성분이 분리된 형태로 코팅 소성되도록 촉매를 제조하는 것임을 특징으로 하는 개질반응용 내열성 개선 모노리스 촉매의 제조방법.
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