CAJ | 학술논문

采用水热处理和草酸处理相结合的方法对Y分子筛进行改性，采用N2吸附-脱附、XRD、吡啶吸附FTIR、27Al MAS NMR和SEM等方法对Y分子筛进行了表征，并在微型反应装置上评价了改性Y分子筛制备的催化剂的加氢裂化活性，考察了不同浓度草酸改性对Y分子筛性能的影响。表征结果显示，随草酸浓度的提高，Y分子筛的比表面积、孔体积和孔径逐渐增大；硅铝比均明显提高，相对结晶度增大，晶胞常数减小；总酸量、弱酸酸量、中强酸酸量及B酸酸量均出现不同程度的减小。催化剂的加氢裂化活性评价结果表明，较为适宜的草酸处理浓度为0.20 mol/L。
채용수열처리화초산처리상결합적방법대Y분자사진행개성，채용N2흡부-탈부、XRD、필정흡부FTIR、27Al MAS NMR화SEM등방법대Y분자사진행료표정，병재미형반응장치상평개료개성Y분자사제비적최화제적가경열화활성，고찰료불동농도초산개성대Y분자사성능적영향。표정결과현시，수초산농도적제고，Y분자사적비표면적、공체적화공경축점증대；규려비균명현제고，상대결정도증대，정포상수감소；총산량、약산산량、중강산산량급B산산량균출현불동정도적감소。최화제적가경열화활성평개결과표명，교위괄의적초산처리농도위0.20 mol/L。
Y zeolite was modified through hydrothermal treatment and then oxalic acid treatment. The products were characterized by means of N2 adsorption-desorption,XRD,pyridine adsorption FTIR,27Al MAS NMR and SEM. The effects of the oxalic acid concentration on the properties of the Y zeolites were investigated. The results showed that with the increase of the oxalic acid concentration,the specific surface area,pore volume and pore size of the modified Y zeolites gradually increased,their silica-alumina ratio was obviously improved,the relative crystallinity increased but the unit cell constant decreased,the amounts of total acid,weak acid,middle strong acid and B acid decreased in varying degrees. The performances of the catalysts prepared from the modified Y zeolites in hydrocracking were evaluated in a microreactor and the results showed that the suitable oxalic acid concentration for the modification was 0.20 mol/L.