Ionic Liquids and Eutectic Mixtures as Solvent and Template in Synthesis of Zeolite Analogues.

Abstract

Aluminum I 2100Ionic Liquids and Eutectic Mixtures as Solvent and Template in Synthesis of Zeolite Analogues. -The synthesis of different aluminophosphate zeolite analogues using 1-ethyl-3-methyl imidazolium bromide or a choline chloride/urea eutectic mixture as both solvent and template is demonstrated. Because of the vanishingly low vapor pressure of ionic liquids, synthesis takes place at ambient pressure, eliminating safety concerns associated with high hydrothermal pressures. The ionic liquid can also be recycled for further use. The structures of (II) (triclinic, space group P1; novel structure type), (III) (orthorhombic, Pna21, Z = 4; novel zeotype), (IV) (orthorhombic, Ibm2; AlPO-11 type), and (V) (triclinic, P1; AlPO-34 type) are determined by single crystal XRD. -(COOPER, E. R.; ANDREWS, C. D.; WHEATLEY, P. S.; WEBB, P. B.; WORMALD, P.; MORRIS, R. E.; Nature (London, UK) 430 (2004) 7003,

Applications of functionalized ionic liquids

“…In another report, 1-methyl-3-ethylimidazolium bromide was used as solvent and template in the synthesis of a series of aluminophosphate zeotype framework [129] . A choline chloride/urea eutectic mixture has also been employed as solvent in the preparation of a new zeotype framework derived from Al(OiPr) 3 formed during the reaction, the NH 4 + cation formed on the partial decomposition of urea acts to template the structure and balance the charge distribution of the framework, and the procedure is termed as "ionothermal" synthesis for distinguishing from other preparations.…”

Solvent-free synthesis of zeolite catalysts

“…In 2004, Cooper et al [8] reported first example of ionothermal synthesis of zeolite and zeolitic materials in the presence of ionic liquid. In their research, ionic liquid of 1-ethyl-3-methylimidazolium bromide ([EMIm]Br) and deep eutectic solvents of urea/choline chloride were chosen to prepare aluminophosphate zeolites (named as SIZ-n), which open the door for ionothermal synthesis of zeolites ( Figure 2).…”

“…To solve these problems, several strategies have been developed [6][7][8][9][10][11][12][13]. Xu et al [6] designed a new vapor-phase method for preparation of zeolites; Morris et al [8] successfully synthesized zeolite and zeolitic materials in the presence of ionic liquids; and recently, Xiao et al [11] reported preparation of zeolites without using solvents. This review presents a brief survey of recent developments in the solvent-free synthesis of zeolites.…”

“…Although water can be regarded as the most "green" solvent, the use of excess water in the industrial process results in several issues such as (1) high autogeneous pressure at relatively high temperature and consequent issues with equipment safety; (2) low utilization efficiency of the autoclaves and consequent low solid yields; (3) pollution from large amounts of wastewater [5]. To solve these problems, several strategies have been developed [6][7][8][9][10][11][12][13]. Xu et al [6] designed a new vapor-phase method for preparation of zeolites; Morris et al [8] successfully synthesized zeolite and zeolitic materials in the presence of ionic liquids; and recently, Xiao et al [11] reported preparation of zeolites without using solvents.…”

Surface of room temperature ionic liquid [bmim][PF6] studied by polarization- and experimental configuration-dependent sum frequency generation vibrational spectroscopy

“…Owing to these excellent technical advantages, RTILs have shown great potentials in a variety of applications, including catalysis [6], electrochemistry [7], synthesis [8], separation [9], and green chemistry [10], many of which involve chemical or physical processes on the RTIL surface. As a result, a great number of experimental and theoretical efforts have been made to investigate the surface structure of ionic liquids using various techniques such as surface tension measurements [11], X-ray/neutron reflectivity [12,13], sum frequency generation vibrational spectroscopy (SFG-VS) [14][15][16] and molecular dynamics (MD) simulations [17][18][19][20].…”