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本文提出了气固相非一级不可逆反应所用催化剂球化后对内表面利用率的通用计算方法。计算中分别将两端封闭的园柱体和周边封闭的园形薄片,在等温催化过程中和球体状催化剂的内表面利用率相比较,发现在同一 Thiele 模数时,它们之间的差异略大于一级不可逆反应。工业气固相催化反应所用催化剂形状不一,为了方便,需对各种不同形状催化剂的内表面利用率进行通用计算。有关文献报导,当一级不可逆反应时,计算了薄片和无限长园柱形催化剂的内表面利用率,并与等比外表面积的球形颗粒进行比较。解析解计算的结果,发现当Thielc 模数很大或很小时。三者不同形状催化剂的内表面利用率几乎相同,只在中间范围内才有差异,但仍很接近。因此,认为对于一级不可逆反应,不同形状催化剂内表面利用率均可按与颗粒具有相等比外表面积的球体来计算,但对非一级不可逆反应的适用性未有论及。本文同样以上述二种非球形催化剂,采用球化的方法与球形催化剂的等温双组分非一级不可逆反应的内表面利用率进行了计算,以了解球化方法在非一级不可逆反应中的适用性。
In this paper, a general method for calculating the utilization rate of inner surface of a catalyst for non-first-order irreversible gas-solid phase after spheroidization is proposed. In the calculation, both the closed cylinder and the circumferentially closed circular disc were compared with the utilization rate of the inner surface of the spherical catalyst in the isothermal catalysis, and the differences between them were found slightly in the same Thiele modulus More than one irreversible reaction. Catalysts used in industrial gas-solid catalytic reactions have different shapes and, for convenience, a general calculation of the internal surface utilization of various shaped catalysts is required. It has been reported in the literature that when the first order irreversible reaction is applied, the inner surface utilization efficiency of the sheet and the infinite cylindrical catalyst are calculated and compared with the spherical particles having the same specific surface area. Analytical solution of the results and found that when the Thielc modulus is large or small. The utilization rates of the inner surfaces of the three different shaped catalysts are almost the same, only differing in the middle range, but still close. Therefore, it is considered that for the first order irreversible reaction, the internal surface utilization rates of different shape catalysts can be calculated as spheres with the same specific surface area as the particles, but the applicability to the non-first-order irreversible reaction is not discussed. In this paper, we also use the above two kinds of non-spherical catalysts, the use of spheroidization method and spherical catalyst isothermal two-component irreversible reaction of the inner surface utilization was calculated to understand the non-first order ball non-reversible reaction applicability.