CAJ | 학술논문

采用等体积浸渍法制备了一系列 Cu 改性4A 分子筛催化剂，用于过氧化氢液相催化氧化苯甲醇制苯甲醛的反应。采用 N2等温吸附-脱附法、XRD 和程序升温还原对不同负载量的 CuOx /4A 催化剂进行了表征。当苯甲醇20 mL、双氧水30 mL、催化剂0．2 g、反应温度80℃、反应时间5 h 时，质量分数6％CuOx /4A 催化剂上苯甲醇的转化率为49．5％，苯甲醛选择性为83．6％，苯甲醛收率为41．4％，反应活性最高；4A 分子筛上 Cu 及 Cu 负载量的改变，显著影响着催化剂的比表面积、金属物相结构和还原性。6％CuOx /4A 催化剂表现出较佳的催化氧化苯甲醇制苯甲醛性能，主要归因于4A 分子筛上高分散的 Cu-O 物种；而且6％CuOx /4A 催化剂具有较低的还原温度。
채용등체적침지법제비료일계렬 Cu 개성4A 분자사최화제，용우과양화경액상최화양화분갑순제분갑철적반응。채용 N2등온흡부-탈부법、XRD 화정서승온환원대불동부재량적 CuOx /4A 최화제진행료표정。당분갑순20 mL、쌍양수30 mL、최화제0．2 g、반응온도80℃、반응시간5 h 시，질량분수6％CuOx /4A 최화제상분갑순적전화솔위49．5％，분갑철선택성위83．6％，분갑철수솔위41．4％，반응활성최고；4A 분자사상 Cu 급 Cu 부재량적개변，현저영향착최화제적비표면적、금속물상결구화환원성。6％CuOx /4A 최화제표현출교가적최화양화분갑순제분갑철성능，주요귀인우4A 분자사상고분산적 Cu-O 물충；이차6％CuOx /4A 최화제구유교저적환원온도。
CuOx /4A catalysts with different Cu loading were investigated to produce benzaldehyde by hydrogen peroxide in liquid-phase oxidation. The CuOx /4A catalysts were characterized by N2-isothemy adsorption desorption,XRD and H2 temperature-programmed reduction.Under the condition of benzyl alcohol 20 mL,H2 O2 30 mL,80 ℃,catalysts 0.2 g,5 h,mass fraction 6% CuOx /4A catalyst has the highest reactivity,with the conversion rate of benzyl alcohol 49.5% ,the selectivity and yield of benzaldehyde 83.6% and 41.4%respectively.Cu and Cu loading affects the surface area,volume and redox property of the catalysts.The result shows that mass fraction 6% CuOx /4A catalyst has higher reactivity,due to highly-dispersed Cu-O species and lower redox temperature.