Direct synthesis of dimethyl ether on the admixed nanocatalystsof CuO–ZnO–Al2O3 and HNO3-modified clinoptilolite at high pressures: Surface properties and catalytic performance

Abatement of toluene from polluted air over Mn/Clinoptilolite–CeO2 nanopowder: Impregnation vs. ultrasound assisted synthesis with various Mn-loading

“…A comparison between FTIR spectra of these samples reveals no noticeable changes. However, the stretching vibration for structural -OH and absorbed water at wave number of 3450 and 1640 cm À1 for all the samples were noticed these vibrations refer to physically absorbed water on all samples after catalyst heat treatment [52][53][54]. The main characteristic bands of clinoptilolite were found at wavelength of 460, 600, 725, and 1075 cm À1 .…”

Direct conversion of syngas to dimethyl ether as a green fuel over CuO-ZnO-Al2O3/HZSM-5 nanocatalyst: Effect of aging time on physicochemical and catalytic properties

“…[29][30][31][32] Precipitation is one of conventional methods for production of nano-sized materials over a support. 33,34 The structural properties of nanocatalysts synthesized via this method have been influenced by several factors, such as pH of solution during of precipitation process, aging temperature and type of precipitant. 35 One of the important factors that have a significant effect on precipitation method is the aging time.…”

Nanocatalysts: Effect of Active-phase and Promoter on Catalytic Properties and Performance in the Hydrodesulfurization Reaction

“…The broad vibration band in the wide range between 3000-3500 cm −1 and the wavenumbers at 1640 and 1390 cm −1 are assigned to the vibration of hydroxyl group (-OH) (Khoshbin et al, 2013;Rahemi et al, 2013;Sajjadi et al, 2013) and physically adsorbed water molecules (Pipelzadeh et al, 2009;Khatamian et al, 2012) present on the γ -alumina surface in all samples. The bands located at 1134 and 940 cm −1 are due to the existence of phosphate ion (PO 4 3− ) and metal oxide (M-O), respectively.…”