Acid doping adsorption model

The catalyst claimed by Saudi Basic is in large part amorphous, but shows a few diffraction lines relative to a crystalline compound characterized by d values at 4.03 (100% I), 3.57, 2.01 and 1.86 A. Doping the compound with P improves the yield to acetic acid this was attributed to an enhancement of surface acidity, which facilitates the ethylene adsorption and the acetic acid desorption. A detailed investigation of catalyst composition confirmed that the former model originally proposed by Merzouki et al. [4a, b] was the most likely [4c]. Therefore, the excellent properties... 

Doping dodecyl benzene sulfonic acid (DBSA) into PANI/carbon nanotube composite can fabricate PANI/carbon nanotube-DBSA nanocomposite [56]. The preparation, as well as the adsorption to Cr(VI), is depicted in Figure 11.11 with the pseudo-second-order kinetics and Freundlich isotherm model with maximum monolayer adsorption capacity of 55.55 mg/g. Electrostatic interactions between PANI and Cr(VI) anions are the predominant driving forces for this adsorption process. 

In this chapter we will firstly present a literature survey on vapour pressure, viscosity and conductivity properties of phosphoric acid with an emphasis on the temperature and composition range relevant for fuel cell applications. In a second part we want to elucidate the physico-chemical interactions of a protic electrolyte like phosphoric acid as a doping agent with polybenzimidazole-type polymer membranes. Literature data on m-PBI and AB-PBI as well as own measurements on Fumapem AM-55, a commercial PBI derivative, will be cOTisidered. On the basis of the observed doping behaviour a model describing the thermodynamics of the adsorption process is presented. 

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