【摘要】 在三乙胺-氢氧化铝-磷酸-水体系中,150～200℃条件下,采用水热法合成了AlPO₄-5分子筛,在1400～400cm^-1区间内,对它的晶化、灼烧、吸附与脱附氨的过程进行了红外跟踪测定。同时,还采用了计算机分峰的新技术——微分光谱（二次导数红外光谱,简称为2DIR光谱）,将测得的IR谱带进行了分峰处理。结果表明:采用三乙胺为模板剂合成的AlPO₄-5的特征IR谱带峰位在1125（强）、736（弱）、705（弱）、630（弱）、560（中）、473（较强）cm^-1处。并在1220cm^-1附近存在一个肩峰。经2DIR处理后,1220cm^-1附近的肩被分离成一个独立峰,在晶化初期就可以被2DIR光谱分辨出来,在IR谱图中,1125cm^-1处的强吸收带经2DIR处理后,可以分离出1166、1124、1093、1072及1019cm^-1等几个峰。这些被2DIR分离出来的谱峰,在AlPO₄-5分子筛的晶化、灼烧及对氨的吸附与脱附过程中,都发生了有规律的变化。我们发现1093、1072和1019cm^-1谱峰与羟基振动有关。根据这些谱带在AlPO₄-5的灼烧、吸附与脱附过程中的变化,1093cm^-1谱峰可归属于P—OH键的弯曲振动,而1072cm^-1谱峰可归属于（?）的弯曲振动。更多还原

【Abstract】 An AlPO₄-5 molecular sieve was synthesized hydrothermally in the system of （C₂H₅）₃N-Al（OH）₃-H₃PO₄-H₂O at 150-200℃. In the region of 1400-400 cm^-1, the IR spectra of AlPO₄-5 were determined during crystallization, calcination, adsorption and desorption with NH₃. A new peak-resolving technique——differental spectra （2nd derivative IR spectra, i. e. 2DIR spectra）was utilized. The bands of IR spectra of AlPO₄-5 were processed to resolve peaks by the 2DIR spectra programme. The result indicated that characteristic bands of IR for AlPO₄-5 synthesized with （C₂H₅）₃N exist at 1125 （strong）, 736 （weak）, 705 （weak）, 630 （weak）, 560 （medium）, 473 （medium strong） and as a shoulder near 1220 cm^-1. After processing by the 2DIR programme, the shoulder near 1220 cm^-1 was dissociated completely to a peak, which had been recognized on the 2DIR spectra at the beginging of crystallization. The strong band at 1125 cm^-1 in the IR spectra of AlPO₄ 5 was dissociated into bands at 1166, 1124, 1093, 1072 and 1019 cm^-1. It was found that the bands at 1093, 1072 and 1019 cm^-1 were relevant to bend vibration of hydroxyl groups. According to cbanges of these bands during calcination, adsorption and desorption, it seems that the band at 1093 cm^-1 may be assigned to P—OH as bend vibration, and 1072 cm^-1 to . The assignment of other bands was also discussed.更多还原