Adsorptive removal of halo-olefinic impurities from 1,1,1,3,3-pentafluoropropane over ion-exchanged Y zeolites

Effect of Doping Al on the Desulfurization Performance of Ag/SiO2–Al2O3 Aerogel Composite Adsorbents

“…The Py-FTIR spectra of Ag/SiO 2 and Ag/SiO 2 –Al 2 O 3 -100 are depicted in Figure a, b, respectively. The band at 1450 cm –1 is attributed to Lewis acid center bonded pyridine, 1540 cm –1 is assigned to Brönsted acid center bonded pyridine, and 1490 cm –1 can is ascribed to Lewis and Brönsted acid centers bonded pyridine. , Thus, only Lewis acid sites existed in Ag/SiO 2 originating from Ag­(I), whereas both Lewis and Brönsted acid sites appeared in Ag/SiO 2 –Al 2 O 3 -100. Compared with Ag/SiO 2 , the content of Lewis acid sites of Ag/SiO 2 –Al 2 O 3 -100 increased by 17%, which was almost consistent with the enhancing degree of the actual content of Ag, suggesting the Lewis acid sites in Ag/SiO 2 –Al 2 O 3 -100 were also provided by Ag­(I).…”

“…The band at 1450 cm −1 is attributed to Lewis acid center bonded pyridine, 1540 cm −1 is assigned to Bronsted acid center bonded pyridine, and 1490 cm −1 can is ascribed to Lewis and Bronsted acid centers bonded pyridine. 37,38 Thus, only Lewis acid sites existed in Ag/SiO 2 originating from Ag(I), 10 Breakthrough Adsorption Experiment. Figure 7a displays the breakthrough adsorption curves of TP from MF-7 (TP: 2 mg of S/g) over SiO 2 aerogel, Ag/SiO 2 , and Ag/SiO 2 −Al 2 O 3 -n aerogel composites, respectively.…”

Influence of the Surface and Structural Characteristics of Activated Carbons on Adsorptive Removal of Halo-Olefinic Impurities from 1,1,1,3,3-Pentafluoropropane

“…However, the research reports about the influences of composition, structure and natures of above mentioned adsorbents on the adsorption performances for haloolefins are rarely found. In our previous study [6], it was found that HCFC1233zd impurity can be substantially removed from the HFC-245fa product via the adsorption over multivalent metal cations and Cu + cation exchanged Y zeolites, which is ascribed to the formation of π-adsorption complexes between HCFC-1233zd and zeolites, rather than over alkaline metal cations exchanged Y zeolites. However, HCFC-1224zb and HCFC-1224xe impurities cannot be obviously removed from the HFC-245fa product via the adsorption, regardless of the cations introduced in Y zeolite used as an adsorbent.…”