1988
DOI: 10.1080/01614948808078619
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The Role of Deposited Poisons and Crystallite Surface Structure in the Activity and Selectivity of Reforming Catalysts

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Cited by 100 publications
(27 citation statements)
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“…Apparently, Mo acts as a diluent of the catalyst matrix and therefore reduces the size of Co sites leading to a decreased ratio of surface H/C. 27 Rate-temperature measurements over both catalysts showed that the activation energy over the Co catalyst ( E , = 122 kJ mol-') is slightly higher than that for bimetallic one ( E , = 110 kJ mol-'). Ordinarily one would expect the methanation rate to be higher over a catalyst with lower activation energy (in this case, the bimetallic catalyst).…”
Section: Discussionmentioning
confidence: 99%
“…Apparently, Mo acts as a diluent of the catalyst matrix and therefore reduces the size of Co sites leading to a decreased ratio of surface H/C. 27 Rate-temperature measurements over both catalysts showed that the activation energy over the Co catalyst ( E , = 122 kJ mol-') is slightly higher than that for bimetallic one ( E , = 110 kJ mol-'). Ordinarily one would expect the methanation rate to be higher over a catalyst with lower activation energy (in this case, the bimetallic catalyst).…”
Section: Discussionmentioning
confidence: 99%
“…1.10. Michel et al [44] have observed that after sui phi ding and hydrogen stripping only 10% of the Pt and all of the Re was covered with irreversibly adsorbed S. This has been attributed to the much lower electron affinity of Re [45], and the increases in the electron affinity of Pt by the Re-S bond. It has been demonstrated that sulphur is preferentially bound to the Re atom.…”
Section: The Ptre/alp3 Catalystmentioning
confidence: 99%
“…The improvement in performance of promoted catalysts over those of non-promoted catalysts was attributed to the ligand effect introduced into the promoted catalyst by the incorporation of Mn, Cr and Zn. According to Biswas et al (1988), this ligand effect results from the influence which is exerted on the strength of the bond formed between an active site and the reactant(s) due to the chemical nature of the nearest neighbors of the active site. As was shown earlier, the species present in the activated unmodified coprecipitated Cu-Al catalysts were Cu20, Cuo and A1203 whereas promotion with Mn, Cr, and Zn introduced CuMn02 and Mn2O3, Cu2Cr204 and Cr203, and ZnO and ZnA1204 species, respectively, into the activated promoted catalysts.…”
Section: Rekztionship Between Cul/cuo Mass Ratio and Catalyst Performmentioning
confidence: 99%