CAJ | 학술논문

实验以两步晶化法,利用MCM-22沸石结构前驱体合成一种含介孔的催化材料,用XRD、N_2吸附-脱附、~(27)Al MAS NMR、NH_3-TPD对试样进行了表征.实验结果表明其孔径约为3.3 nm,比表面积为740～870m~2/g,其氢型试样除含有弱酸中心外,还含有强酸中心,总酸量为0.71～0.76 mmol/g.在115℃条件下,试样用于催化2,4-二叔丁基苯酚与叔丁基醇烷基化反应时,2,4-二叔丁基苯酚的转化率约为22%,2,4,6-三叔丁基苯酚的选择性约为49%,其催化活性高于微孔沸石Hβ和常规介孔分子筛HMCM-41.
실험이량보정화법,이용MCM-22비석결구전구체합성일충함개공적최화재료,용XRD、N_2흡부-탈부、~(27)Al MAS NMR、NH_3-TPD대시양진행료표정.실험결과표명기공경약위3.3 nm,비표면적위740～870m~2/g,기경형시양제함유약산중심외,환함유강산중심,총산량위0.71～0.76 mmol/g.재115℃조건하,시양용우최화2,4-이숙정기분분여숙정기순완기화반응시,2,4-이숙정기분분적전화솔약위22%,2,4,6-삼숙정기분분적선택성약위49%,기최화활성고우미공비석Hβ화상규개공분자사HMCM-41.
Mesoporous catalytic materials were synthesized by a two-step crystallization process with the precursor of MCM-22 zeolite and characterized by XRD, N_2 physical adsorption-desorption, ~(27)Al MAS NMR, and NH_3 - TPD methods. The results demonstrated that the pore diameter of the sample was 3. 3 nm and surface area was 740 - 870 m~2/g. H-form samples had both strong and weak acid sites, with the total acid amount of about 0. 71 -0. 76 mmol/g. The samples were used to catalyze the alkylation of 2,4-tert-butylphenol with tert-butylalcohol at 115℃ , with the conversion of 2,4-ditert-butylphenol and the selectivity to 2,4,6-tritert-butylphenol being about 22% and 49%, respectively. The catalytic activity was higher than microporous zeolite Hβ and traditional mesoporous molecular sieve A1MCM-41.