A multiple-assembly/one-pot-crystallization strategy for a relatively more eco-friendly synthesis of hydrothermally stable mesoporous aluminosilicates

Abstract

Mesoporous aluminosilicates (MA) with high hydrothermal stability obtained by assembly of zeolite Y precursors are attractive for the potential application in heavy oil catalytic cracking. A relatively more eco-friendly synthesis of MA with low synthesis cost and waste water discharge is particularly appealing. We report on the green synthesis of MA via a multiple-assembly/one-pot-crystallization (MA/OC) process by recycling the non-reacted reagents in the assembly mother liquor after separating the assembly solid product. This approach was achieved by exact supplementary compensation of the consumed raw materials and correct pH adjustment for the assembly liquor after each cycle of assembly. The assembly solid products in 5 cycles were collected and crystallized in one-pot in the mother liquor. Characterization results indicated that consumption of P123 and water discharge of MAOC-5 could be reduced to 51.5% and 27.3% of those of conventional MA-1. Meanwhile, the product yield of MAOC-5 is 102.66 g L À1 , 4.8 times that of MA-1. This strategy suggests a relatively more eco-friendly and low cost route for the synthesis of hydrothermally stable MA.

Introduction of Anionic Surfactants to Copolymer Micelles: A Key to Improving Utilization Efficiency of P123 in Synthesis of Mesoporous Aluminosilicates

“…Mother liquor recycling (MLR) procedures have been performed for preparation of various microporous zeolites, such as Y, ZSM-5, and TS-1 . On the basis of the above study, our group reported the application of MLR in the preparation of MAs with significantly decreased amounts of organic surfactants and water . However, MLR mentioned above is a relatively complicated procedure, and in some cases the process is difficult to control.…”

“…11 On the basis of the above study, our group reported the application of MLR in the preparation of MAs with significantly decreased amounts of organic surfactants and water. 12 However, MLR mentioned above is a relatively complicated procedure, and in some cases the process is difficult to control. Another disadvantage of MLR is that the accumulation of inorganic salts will decrease the cloud point of P123.…”

Obtaining of Mesoporous Aluminosilicates with High Hydrothermal Stability by Composite Organic Templates: Utility and Mechanism

“…A series of mesoporous aluminosilicates (MAs) with good hydrothermal stability have been prepared by self-assembly of basic characteristic structure units of microporous zeolite Y by our group. − Much attention has been focused on these materials obtained by this novel strategy because of their distinct textural structures and their potential application in heavy oil catalytic cracking . As we know, active micelles are prerequisite for the assembly of aluminosilicate raw materials. , On the other hand, active micelles will exist only in low concentration of P123 solution, leading to the low utilization efficiency of both organic template and water .…”

Hydrophobic Polypropylene Glycol Integration into the Micelles: A General Approach for High Utilization Efficiency of Organic Template

“…For example, 0.5 g of crystal seeds is required for per gram of MAs product . For mother liquor recycling (MLR) by assembly and crystallization in high precursors concentration, although decreased amounts of organic surfactants and water are achieved, the ordering of final products is unsatisfactory due to the decrease of the cloud point of P123. − In addition, MLR mentioned above is a complicated process, and the repeatability of this procedure is relatively poor. Consequently, it is still a big challenge to develop a feasible and effective route to improve the utilization efficiency of P123 in obtaining MAs.…”