Taking toluene as the probe molecule, a series of methods were used to evaluate the adsorption properties of as-synthesized hierarchical zeolites samples including the adsorption breakthrough curves, simulation of adsorption isotherms as well as kinetics models and toluene-TPD (the temperature programmed...
The catalysts were characterized by temperature programmed desorption (TPD) of ammonia for acid sites distribution analysis and platinum dispersion in the catalysts by hydrogen chemisorption. Moreover, the diffusion resistance extent in the current catalysts during the alkylation reaction has been evaluated...
The proposed mechanism was derived from various characterization results such as temperature-programmed desorption (TPD) and temperature-programmed surface reaction (TPSR) water, TPSR toluene, TPD O2 and in situ DRIFT of toluene decomposition, and steam reforming of toluene. Five kinetic models were ...
The physicochemical properties evolution of perovskite materials over the reactive grinding process was investigated by XRD, N 2 -physisorption, ICP-OES, XPS, H 2 -TPR, O 2 -TPD and OIE, while their catalytic performances were evaluated for the toluene total oxidation reaction in dry and wet ...
The water senaratpd out in the receiver is withdrawn through a valved line from the bottom thereof, while the condensate and uncondensed gases are conducted through a line 66 into an absorber 68.. A portion of the nondensate separated out in the receiver 65 is withdrawn through a valved ...
The dispersion and surface chemistry of MnOx/La-Al2O3 catalyst were approached by XRD, Raman spectra, TEM, H2-TPR, O2-TPD, XPS and in situ DRIFT spectrometer. Access through your organization Check access to the full text by signing in through your organization. Access through your ...
The higher K+content is helpful for the formation of more Pt0species, and both the higher K+content and the lower number of terminal silanol defects are favourable for the adsorption of toluene, as evidenced by XPS and the toluene-TPD profiles. More importantly, the Pt/KBeta-SDS catalyst ...
The detailed analysis of acidic property by means of ammonia IRMS-TPD method showed that the Ni loading generated Lewis acid sites on the zeolite. The synergy of Br酶nsted and Lewis acid sites, ascribed to Si-OH-Al and Ni species, respectively, is suggested to give the high activity of ...
NH3-TPD and IR results show that only weak and medium acid sites could be observed on the catalysts, and the number of total acid sites decreases obviously with the increase of the Si/Al ratio whereas the medium acid sites are somewhat constant. The introduction of platinum onto ...
3(b). Zhu et al [67] found that the introduced H2O could form more hydroxyl groups on the catalytic surface during toluene oxidation and promote the deep oxidation of toluene, which was consistent with the results of H2O-TPD (Fig. 7) and toluene oxidation tests in 5.0 vol% H2O (Fig. ...