Optimization of MCM-48 synthesis using factorial design

Abstract

MCM-48 mesoporous materials were hydrothermally synthesized according to the 2 2 factorial design by varying the crystallization time and temperature of the synthesis gel, and characterized by means of X-ray diffraction analysis and adsorption of N 2 . In the crystallization temperature and time conditions used, specific areas between 924 to 1102 m 2 .g -1 , pore volumes between 0.015 to 0.087 cm 3 .g -1 and pore diameters between 3.2 to 4.0 nm were obtained. It was observed that for the syntheses performed at high temperature, the crystallization time should be reduced so that the material structure is formed. Keywords: MCM-48, 2 2 factorial design, crystallization temperature and time. ResumoO material mesoporoso MCM-48 foi sintetizado hidrotermicamente de acordo com o planejamento fatorial 2 2 , variando-se a temperatura e o tempo de cristalização do gel de síntese, e caracterizado através de análise por difração de raios X e adsorção de N 2 . Nas condições de temperatura e tempo de cristalização utilizadas, foram obtidas áreas específicas entre 924 a 1102 m 2 .g -1 , volumes de poros entre 0,015 a 0,087 cm 3 .g -1 e diâmetros de poros entre 3,2 a 4,0 nm. Observou-se que, para as sínteses realizadas com temperatura elevada, deve-se reduzir o tempo de cristalização para que a estrutura do material seja formada. Palavras-chave: MCM-48, planejamento fatorial 2 2 , temperatura e tempo de cristalização.

Low temperature synthesis of MCM-48 and its adsorbent capacity for the removal of basic red 29 dye from model solutions

“…MCM-48 (Mobil Composite Material No. 48) type materials were found to be desirable adsorbents, catalysts and catalyst supports with high BET surface areas, narrow pore size distributions, and large pore volumes [ [11] , [12] , [13] , [14] , [15] ]. They have typically been utilized for the treatment of contaminants from wastewaters of different industries including the textile industry [ [16] , [17] , [18] , [19] , [20] , [21] , [22] ].…”

Template Recycling and Reuse in MCM-41 Synthesis: Statistical Study

“…The approach of "one-factor-at-a-time" was reported mostly on studying the effects of varying synthesis parameters such as composition of reaction mixture, silica source, surfactant, pH, temperature and time [13]. "One-factor-at-a-time" is a design that involves the changes of one factor while setting all other factors constant without investigating the interaction between synthesis parameters and MCM-41 product characteristics [14]. In the current study, the effects of the interaction of significant factors are studied simultaneously using the factorial design.…”