CAJ | 학술논문

用FT-IR和MAS NMR方法探索了不同改性方法对Y分子筛表面酸性质的影响。研究结果表明，改性后分子筛骨架发生脱铝，酸性OH基团的FT-IR特征峰波数向低波数位移，骨架n(Si)/n(A1)增大，表面B酸中心减弱，L酸中心增强，B酸中心强度得到加强。催化剂评价结果表明，产物中副产物正丙苯的生成与分子筛表面B酸中心强度直接有关，其含量正比于Y分子筛表面B酸中心强度。
용FT-IR화MAS NMR방법탐색료불동개성방법대Y분자사표면산성질적영향。연구결과표명，개성후분자사골가발생탈려，산성OH기단적FT-IR특정봉파수향저파수위이，골가n(Si)/n(A1)증대，표면B산중심감약，L산중심증강，B산중심강도득도가강。최화제평개결과표명，산물중부산물정병분적생성여분자사표면B산중심강도직접유관，기함량정비우Y분자사표면B산중심강도。
The influence of the surface acidity of modified Y zeolites has been investigated by using FTIR and MAS NMR. The IR wave number shift of acid OH group toward lower frequencies, the reduction of B acid sites, the increase of framework n (Si)/n(Al) ratio, L acid site and the strength of B acid sites of modified Y zeolites indicated the conversion of framework alumina to non-framework alumina.The by-product n-propylbenzene associated directly with the strength of B acid sites of Y zeolites. The amount of n-propylbenzene was in proportion to the strength of B acid sites.