CAJ | 학술논문

以天然气供应多元化和煤炭清洁高效利用为目标，煤制合成天然气受到重视，合成气完全甲烷化是煤经合成气制天然气的关键技术，而甲烷化催化剂是其核心要素。合成气甲烷化催化剂的主流催化剂为镍基催化剂，常用助剂为稀土氧化物、过渡金属和碱土金属，载体为Al2 O3、SiO2、ZrO2、TiO2或复合氧化物，制备方法为干混法、浸渍法、沉淀法及溶胶-凝胶法。国内外主要研究热点是提高甲烷化催化剂在固定床反应器中的高温、高压及高空速条件下的稳定性和机械强度。建议深入研究催化剂的烧结机理及助剂作用机理，探索新的制备方法，开发新型高温甲烷化催化剂；对于强放热的煤制合成天然气工艺，也应加大流化床甲烷化技术及催化剂的开发。
이천연기공응다원화화매탄청길고효이용위목표，매제합성천연기수도중시，합성기완전갑완화시매경합성기제천연기적관건기술，이갑완화최화제시기핵심요소。합성기갑완화최화제적주류최화제위얼기최화제，상용조제위희토양화물、과도금속화감토금속，재체위Al2 O3、SiO2、ZrO2、TiO2혹복합양화물，제비방법위간혼법、침지법、침정법급용효-응효법。국내외주요연구열점시제고갑완화최화제재고정상반응기중적고온、고압급고공속조건하적은정성화궤계강도。건의심입연구최화제적소결궤리급조제작용궤리，탐색신적제비방법，개발신형고온갑완화최화제；대우강방열적매제합성천연기공예，야응가대류화상갑완화기술급최화제적개발。
Aiming at the diversification of the natural gas supplying and the high-efficiency and clean coal conversion,the coal-to-synthetic natural gas technology has been attracted more and more attention. Meth-anation catalyst plays a key role in bringing such a technology into commercialization. The main methanation catalysts were Ni-based catalysts. Rare earth oxides,transition metal oxides and alkaline earth metal oxides were used as the promoters. Al2 O3 ,SiO2 ,ZrO2 ,TiO2 and the mixed-oxides were applied as the supports. Catalysts were prepared by the dry-mixed method,wetness impregnation method,precipitation method and sol-gel method. The research on methanation catalysts was focused on improving the stability and mechanical strength of the catalysts under the conditions of high-temperatures,high-pressure and high space velocity in the fixed-bed reactors. It is suggested that the mechanisms of sintering and promoting should be investigated thoroughly,and the novel preparation methods should be explored to develop new catalysts. Compared with the fixed-bed reactors and their catalysts,the fluidized-bed reactors and their corresponding catalysts are more promising for the strongly exothermic methanation reaction.