A dataset for thermal stability of P-loaded Li-LSX zeolite for air separation

Commercially available Li-LSX (Si/Al ≈ 1.0, extent of exchange of 99%) zeolite was supplied from Luoyang Jian Long Co., Ltd., China. Other reagents were commercially available and used without further purification. The phosphorus modified samples were conducted by wet impregnation of Li-LSX with an aqueous solution containing the desired amount of H3PO4 at room temperature with liquid-to-solid ratio of 4 ml/g, and the slurry was mixed thoroughly and placed in open air for 24 h followed by drying at 100 oC for 4 h. Prior to investigation, the samples were further treated at 400~600 oC for several hours. The prepared samples were denoted as PLi-LSX-x-y-z, where x indicated the concentration of H3PO4 (mol/L), y indicated the calcination temperature (oC) and z indicated the calcinations time (h). X-ray diffraction (XRD) patterns were recorded on a Bruker D8 Advance diffractometer with Cu kα radiation (λ = 0.1541 nm) at a scanning speed of 5 o/min in the range of 2θ = 5-60o. Fourier Transform Infrared Spectroscopy (FT-IR) was performed using a Nicolet 380 spectrometer by applying the KBr pellet technique. Scanning electronic microscopy (SEM) and energy dispersive spectrometer (EDS) were employed to examine the morphologies and compositional of samples on a Hitachi scanning electron microscope (FlexSEM1000). The element contents in the samples were characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES, 715-ES, Varian), and the Si/Al molar ratio, Li/Al molar ratio and contents of phosphorus (P wt%) were calculated. The textural properties of samples were analyzed by nitrogen adsorption at 77K on a Quantachrome Autosorb-1 instrument. The total surface area (SBET) and total pore volume (Vtotal) were calculated by the Brunauer-Emmett-Teller (BET) equation. The micropore surface area (Smicro), external surface area (Sexter) and micropore volume (Vmicro) were calculated by the t-plot method. Magic-angle-spinning nuclear magnetic resonance (MAS NMR) were used to study the coordination environment of Al and P atoms within the zeolite framework. The 27Al and 31P MAS NMR spectra were measured on a Varian InfinityPlus-300 spectrometer with resonance frequencies of 78.13 and 121.37 MHz, respectively.The thermal behaviors of samples were evaluated using Thermogravimetric (TG) analysis and Differential Scanning Calorimetry (DSC). The TG and DSC curves were obtained on a Perkin-Elmer Pyris1 Instrument to determine the thermal behaviors of samples at a heating rate of 10 o/min from 50 to 800 oC in air atmosphere. Figure 1. XRD patterns (a) and FT-IR spectra (b) of phosphorus modified Li-LSX zeolites. Figure 2. SEM (a-e) and elemental mapping images (upper right) of phosphorus modified Li-LSX zeolites. Figure 3. N2 adsorption-desorption isotherms of phosphorus modified Li-LSX zeolites. Figure 4. 27Al (a) and 31P (b) MAS NMR spectra of phosphorus modified Li-LSX zeolites. Figure 5. TG-DSC analysis of phosphorus modified Li-LSX zeolites. Figure 6. XRD patterns of phosphorus modified Li-LSX zeolites calcined at 500 oC (a) and 600 oC (b), as well as SEM images of Li-LSX zeolite (c) and phosphorus modified zeolite (d) calcined at 600 oC. Figure 7. N2 (a) and O2 (b) adsorption isotherms of phosphorus modified LSX zeolites at room temperature under a pressure of 0~300 kPa Figure 8. Performances of PLi-LSX-0.00-400-2 and PLi-LSX-0.01-400-2 for air separation in the recycling experiments.  Table 1. Chemical composition and textural properties of phosphorus modified Li-LSX zeolites Table 2. Nitrogen and oxygen separation performances of phosphorus modified Li-LSX zeolites