【摘要】 采用梯级升温耐热和层叠添加助催化剂技术,运用XRD、BET和SEM表征方法,研究助催化剂对Fe_1-xO基氨合成催化剂热稳定性的影响。结果表明,多助剂的Fe_1-xO基氨合成催化剂晶粒随温度升高而长大,比Fe₃O₄基催化剂晶粒小且长大缓慢;孔径和孔容随温度升高而减小。K₂O和CaO能提高催化剂活性,但不利于热稳定性,CaO和Al₂O₃能均匀分散催化剂晶粒,M既能提高催化剂活性,又能增强其耐热性。更多还原

【Abstract】 Effects of promoters on the thermal stability of Fe_1-x 0 based catalysts were studied by SEM, XRD and BET,after step-wise heating and adding different promoters in a layer-by-layer way.The results showed that for Fe_1-x0 based catalysts with multi-promoters,the crystallites gradually grew up and the pore volume and pore size decreased with increasing temperature,with smaller crystallites and slower grow-up speed than Fe₃O₄ based catalysts.For Fe_1-x0 based catalysts,K₂0 and CaO improve the activity but impair the thermal stability.CaO and A1₂0₃ uniformly disperse the crystallites.M improve both the activity and thermal stability.更多还原