CAJ | 학술논문

采用连续共沉淀与喷雾干燥技术相结合的方法制备了一系列不同镁添加剂含量的微球状沉淀型Fe/Cu/K/Mg/SiO_2(Mg/Fe质量比0～0.11)催化剂.采用H_2/CO体积比为2的合成气在523 K、2.0 MPa、2 000 h~(-1)的条件下于固定床反应器上考察了这一系列催化剂的F-T合成(FTS)反应性能.结果表明,适量镁添加剂的加入可以提高催化剂FTS反应活性,增加稳定性,提高C_(5+)、总烃的时空产率和C_(5～11)汽油馏分段产物的选择性,降低CO_2的选择性,抑制铁基催化剂的水煤气变换(WGS)反应,但过高的Mg添加剂含量易使催化剂的稳定性变差,反应活性下降.结果表明,Mg/Fe=0.07的催化剂在该反应条件下,CO最高转化率达到90%,且具有良好的稳定性;在整个运行期间,有效烃(C_(5+)+C_(2～4)~=)选择性在83%左右,甲烷选择性维持在8%左右.
채용련속공침정여분무간조기술상결합적방법제비료일계렬불동미첨가제함량적미구상침정형Fe/Cu/K/Mg/SiO_2(Mg/Fe질량비0～0.11)최화제.채용H_2/CO체적비위2적합성기재523 K、2.0 MPa、2 000 h~(-1)적조건하우고정상반응기상고찰료저일계렬최화제적F-T합성(FTS)반응성능.결과표명,괄량미첨가제적가입가이제고최화제FTS반응활성,증가은정성,제고C_(5+)、총경적시공산솔화C_(5～11)기유류분단산물적선택성,강저CO_2적선택성,억제철기최화제적수매기변환(WGS)반응,단과고적Mg첨가제함량역사최화제적은정성변차,반응활성하강.결과표명,Mg/Fe=0.07적최화제재해반응조건하,CO최고전화솔체도90%,차구유량호적은정성;재정개운행기간,유효경(C_(5+)+C_(2～4)~=)선택성재83%좌우,갑완선택성유지재8%좌우.
A series of magnesium promoted precipitated Fe/Cu/K/Mg/SiO_2 catalysts (Mg/Fe mass ratio at range of 0-0.11) for Fischer-Tropsch synthesis (FTS) are prepared by a combination method of continuous co-precipitation and spray-drying technology.The catalytic performance of these catalysts for FTS are investigated in a fixed bed reactor under condition of 523 K,2.0 MPa and 2 000 h~(-1) with syngas of H_2/CO=2 for 230 h.The results indicate that the addition of magnesium additive can improve the activity and stability of iron-based catalysts in FTS,enhance the C_(5～11) selectivity in product,increase the space time yield of C_(5+) and total hydrocarbon selectivity,decrease the selectivity of CO_2 and inhibit the activity of WGS.However,the excessive addition of magnesium additive will result in a rapid deactivation of the catalyst.The magnesium promoted iron-based catalyst with Mg/Fe=0.07 is the best among the five catalysts prepared.It has a high CO conversion of 90%,and good stability.Its selectivity of C_(5+)+C_(2～4)~= and CH_4 keep about 83% and 8%,respectively,in the whole run period.