Effect of Ni in palladium β-zeolite on hydroisomerization of n-decane

Abstract

Bifunctional catalysts containing (0.1-0.5 wt%) Nickel and 0.1 wt% of Pd supported on H-β zeolite were synthesized by incipient wetness impregnation method and characterized by XRD, TEM, XPS, TPD and TPR techniques. The catalytic activity of Ni containing and Ni free Pd/H-β Catalysts was studied, and it was found that Ni up to a threshold value (0.3 wt% on β) produced increased the n-decane conversion and isomerization selectivity. When Ni content exceeds the threshold value, the conversion increases but isomerized products decrease. Moreover, Ni containing Pd/H-β showed increased sustainability and favored the protonated cyclopropane (PCP) intermediate mechanism in n-decane isomerization. The catalyst containing 0.3 wt% Ni 0.1 wt% Pd is adjudged as one performing better than other catalysts studied because of the isomerized mixture from it shows better octane number.

Effect of metal content on the activity and product selectivity of n-decane hydroisomerization over Ni-Pd/HY zeolite

“…The increase in the extent of formation of dibranched isomers with increasing temperatures, as well as conversion, indicates that the dibranched isomers are secondary products formed from primary monobranched isomers by formation of a proto-nated cyclopropane intermediate. Similar results have been reported in our previous studies [33][34][35]. In contrast, tribranched isomers were not detected regardless of the catalyst investigated in this work.…”

“…Furthermore, a higher Ni loading decreased the total acidity of the bimetallic catalysts. The decrease in acidity of the bimetallic catalysts with higher nickel loadings could be attributed to the occupation of some acid sites by the added nickel species [33][34][35][36]. In addition, this result could also be related to Ni combining with the Pd particles and the likely growth of the Ni-Pd particles.…”

A comparative study on the laser removal of Cs+ ion from type 304 stainless steel

“…The peaks are shifted as the irradiation of laser shots. The XPS spectra of transition metal peaks have two peak maxima with binding energies, indicating the presence of metallic metal and metal oxide, respectively [16]. A peak at 530.3 eV which corresponds to O 1s , as shown in a small box of Fig.…”

Effect of preparation method on the bimetallic NiCu/SAPO-11 catalysts for the hydroisomerization of n-octane

“…290 °C were assigned to desorption of NH 3 adsorbed on the weak and medium strong acid sites, respectively [9,28] . When the metal component impregnated or precipitated on SAPO-11, the first peak tended to low temperature and the intensity of the second peak decreased, indicating that a part of acid sites were covered by the metal components [18,29] . However, for the NiCu-OMM and NiCu-AM prepared by the mechanical mixing method, the second peak attributed to the medium strong acid was still obvious, indicating that the metal components introduced by mechanical mixing hardly covered the acid sites of SAPO-11.…”