论文部分内容阅读
分子筛作为催化剂具有活性高、选择性和热稳定性好等优点,对许多有机反应和一些无机反应均有良好的催化性能,在化工生产中正发展成为一类新型的高效催化剂。比表面大小是衡量催化剂活性的一项重要指标。一般根据分子筛的完整晶体结构来计算比表面,但均与实测值相差甚远。如A型分子筛的比表面计算值约为1650M~2/g,但测定值只约800M~2/g,相差达一倍。这种计算方法显然是不合用的。应用常规的X射线衍射线宽法测定分子筛的比表面,迄今尚未见文献报导过。因为从下文的叙述将可看
Molecular sieve as a catalyst has the advantages of high activity, good selectivity and thermal stability, and has good catalytic performance for many organic reactions and some inorganic reactions. It is becoming a new type of high-efficiency catalyst in chemical production. Specific surface area is a measure of catalyst activity is an important indicator. Generally based on the complete crystal structure of the molecular sieve to calculate the specific surface, but are far from the measured value. For example, the calculated specific surface area of type A molecular sieve is about 1650M ~ 2 / g, but the measured value is only about 800M ~ 2 / g, the difference is doubled. This method of calculation is clearly not compatible. The determination of the specific surface area of molecular sieve by conventional X-ray diffraction linewidth has not been reported in the literature. Because from the following description will be seen