CAJ | 학술논문

浸渍法制备了Ni-Co/La2O3-γ-Al2O3双金属催化剂,经氢气还原预处理后,再分别由一氧化碳、甲烷和二氧化碳进行再次预处理,考察了预处理方法对该催化剂上沼气重整制氢性能的影响,并运用X射线衍射(XRD)、热重-差示扫描量热(TG-DSC)、透射电子显微镜(TEM)等手段对催化剂进行了表征.结果表明,与传统氢气还原预处理相比,经氢气与一氧化碳预处理后,催化剂性能无明显变化;经氢气与甲烷预处理后,催化剂性能明显变差;而经氢气和二氧化碳预处理后,催化剂性能明显变优,且能基本消除该催化剂上沼气重整反应的诱导期.分析结果表明,经氢气和二氧化碳预处理后,催化剂中金属颗粒较小,分布较均匀,粒径分布范围较窄,从而减少了催化剂表面碳的沉积,增强了催化剂的抗积炭性能,可延长催化剂的使用寿命.
침지법제비료Ni-Co/La2O3-γ-Al2O3쌍금속최화제,경경기환원예처리후,재분별유일양화탄、갑완화이양화탄진행재차예처리,고찰료예처리방법대해최화제상소기중정제경성능적영향,병운용X사선연사(XRD)、열중-차시소묘량열(TG-DSC)、투사전자현미경(TEM)등수단대최화제진행료표정.결과표명,여전통경기환원예처리상비,경경기여일양화탄예처리후,최화제성능무명현변화;경경기여갑완예처리후,최화제성능명현변차;이경경기화이양화탄예처리후,최화제성능명현변우,차능기본소제해최화제상소기중정반응적유도기.분석결과표명,경경기화이양화탄예처리후,최화제중금속과립교소,분포교균균,립경분포범위교착,종이감소료최화제표면탄적침적,증강료최화제적항적탄성능,가연장최화제적사용수명.
@@@@Ni-Co/La2O3-γ-Al2O3 catalysts for biogas reforming were prepared by conventional incipient wetness impregnation and pretreated first by hydrogen reduction and then by pure carbon monoxide, methane and carbon dioxide, respectively. The effect of pretreatment route on the biogas reforming performance of the catalysts was investigated. The catalysts were characterized with X-ray diffraction (XRD), thermogravimetric and differential scanning calorimetry (TG-DSC), and transmission electron microscopy (TEM), and the relationship between the performance and the structural properties of the catalysts was investigated. The results indicated that, compared with the performance of catalysts pretreated by the traditional hydrogen reduction, the performance of catalysts pretreated by hydrogen and carbon monoxide did not change significantly, while the performance of catalysts pretreated by hydrogen and methane deteriorated obviously. Nevertheless, the performance of catalysts pretreated by hydrogen and carbon dioxide was dramatically enhanced and the long adjustment period of the biogas reforming catalysts was basically eliminated. The characterization results showed that the active metal particle size of the catalysts pretreated by hydrogen and carbon dioxide was smal er on average and distributed more evenly and much more narrowly, which notably enhanced the catalysts? carbon resistance and prolonged the catalysts?longevity.