Studying the Factors Effect on the Flowability of (ZnO – CuO/ Al2O3) Catalyst with Blending of Different Lubricants through Hopper. alkej [Internet]. 2009 Dec. 1 [cited 2024 May 3];5(4):18-24. Available from: https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/579