Applied CatalysisPub Date : 1991-10-15DOI: 10.1016/0166-9834(91)80077-A
{"title":"International centre for catalyst characterization and testing","authors":"","doi":"10.1016/0166-9834(91)80077-A","DOIUrl":"https://doi.org/10.1016/0166-9834(91)80077-A","url":null,"abstract":"","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 2","pages":"Pages N20-N21"},"PeriodicalIF":0.0,"publicationDate":"1991-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-9834(91)80077-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136612683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Applied CatalysisPub Date : 1991-10-01DOI: 10.1016/0166-9834(91)80022-O
D.J. Statman, J.T. Gleaves, D. McNamara, P.L. Mills *, G. Fornasari, J.R.H. Ross
{"title":"TAP reactor investigation of methane coupling over samarium oxide catalysts","authors":"D.J. Statman, J.T. Gleaves, D. McNamara, P.L. Mills *, G. Fornasari, J.R.H. Ross","doi":"10.1016/0166-9834(91)80022-O","DOIUrl":"10.1016/0166-9834(91)80022-O","url":null,"abstract":"<div><p>The adsorption and reaction characteristics of a Ba/Sr/Sm<sub>2</sub>O<sub>3</sub> catalyst for methane coupling has been investigated using the TAP (Temporal Analysis of Products) reactor system. Pulsed adsorption experiments using methane, oxygen and krypton at temperatures ranging from 17°C to 800°C show that the transient response of methane is similar to that of Kr and is either not adsorbed, or weakly adsorbed on the catalyst. By contrast, oxygen is strongly adsorbed at temperatures above 500°C which suggests incorporation into the lattice with possible formation of surface anions. Pump-probe experiments in which methane and oxygen are introduced over the catalyst were also performed to investigate the effect of lifetimes of suspected surface intermediates on the relative yields of ethane and ethene. It is shown that the relative yields of both species increase with increasing values of the pulse valve time delay between introduction of the oxygen and methane. An explanation of these results using current knowledge and reasonable speculation of the mechanism is provided.</p></div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 1","pages":"Pages 45-53"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-9834(91)80022-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75482333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Applied CatalysisPub Date : 1991-10-01DOI: 10.1016/0166-9834(91)80027-T
F. Rodríguez-Reinoso *, A. Sepúlveda-Escribano
{"title":"Effect of chromium addition on the behaviour of iron/activated carbon catalysts for carbon monoxide hydrogenation","authors":"F. Rodríguez-Reinoso *, A. Sepúlveda-Escribano","doi":"10.1016/0166-9834(91)80027-T","DOIUrl":"10.1016/0166-9834(91)80027-T","url":null,"abstract":"<div><p>To study the effect of chromium addition to iron/active carbon catalysts in the carbon monoxide hydrogenation reaction at atmospheric pressure, five FeCr/C catalysts were prepared with a range of Cr/Fe atomic ratii. Three samples were prepared by coadsorption of the respective nitrates and the other two by successive adsorption. Catalysts were characterized by carbon monoxide chemisorption at 298 K and their catalytic activity was studied in differential conditions after reduction in hydrogen at 673 K. Both the irreversible carbon monoxide chemisorption and the catalytic activity of the samples decrease with increasing chromium content, this decrease being more important in the catalyst prepared by successive adsorption, with the chromium precursor added after adsorption of iron. Chromium favors methane production without modifying the selectivity towards alkenes. These results are interpreted on the basis of a diluent effect of chromium, which results in a decrease in the amount of surface-reduced iron sites.</p></div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 1","pages":"Pages 95-108"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-9834(91)80027-T","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80807244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Applied CatalysisPub Date : 1991-10-01DOI: 10.1016/0166-9834(91)80088-E
G. Parris, J. Armor
{"title":"Catalytic cracking of organic amidesI. Production ofN-vinylformamide","authors":"G. Parris, J. Armor","doi":"10.1016/0166-9834(91)80088-E","DOIUrl":"https://doi.org/10.1016/0166-9834(91)80088-E","url":null,"abstract":"","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87985900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Reaction of 2-propanol over heteropolyacids after pretreatment in air","authors":"Hideo Orita *, Takashi Hayakawa, Masao Shimizu, Katsuomi Takehira","doi":"10.1016/0166-9834(91)80030-Z","DOIUrl":"10.1016/0166-9834(91)80030-Z","url":null,"abstract":"<div><p>The reaction of 2-propanol over various phosphorus-containing heteropolyacids was investigated as a function of pretreatment temperature and composition of the heteropolyacids. With catalysts pretreated at 100–300 °C, only propene was produced. However, after pretreatment at 450 °C, the selectivity changed in favor of acetone over some mixed molybdenum and tungsten heteropolyacids. From infrared (IR) and thermogravimetry-differential thermal analysis (TG-DTA) measurements, the improvement in acetone selectivity was ascribed to the destruction of Keggin units of the heteropolyacid. The maximum selectivity to acetone was observed for H<sub>3</sub>PMo<sub>12−<em>x</em></sub>W<sub><em>x</em></sub>O<sub>40</sub> when<em>x</em> = 6.</p></div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 1","pages":"Pages 133-140"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-9834(91)80030-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76549075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Applied CatalysisPub Date : 1991-10-01DOI: 10.1016/0166-9834(91)80023-P
D. Klissurski *, Y. Pesheva, N. Abadjieva, I. Mitov, D. Filkova, L. Petrov
{"title":"Multicomponent oxide catalysts for the oxidation of methanol to formaldehyde","authors":"D. Klissurski *, Y. Pesheva, N. Abadjieva, I. Mitov, D. Filkova, L. Petrov","doi":"10.1016/0166-9834(91)80023-P","DOIUrl":"10.1016/0166-9834(91)80023-P","url":null,"abstract":"<div><p>The activity and selectivity of multicomponent oxide catalysts containing Co, Ni, Fe and Bi molybdates have been studied by a gradientless flow-circulation method. The unsupported (K<sub>1</sub> and K<sub>2</sub>) and silica-supported (K<sub>3</sub>) catalysts, some of them promoted with phosphorus and thallium (K<sub>2</sub> and K<sub>3</sub>) have been characterized by X-ray diffraction, infrared spectroscopy, Mössbauer spectroscopy, surface area and porous structure measurements. On the investigated catalysts the selectivity towards the oxidation of methanol to formaldehyde remains extremely high over a wide temperature interval (350–390°C). Significant difference in thermal stability of the catalysts during exploitation has been observed and attributed to the presence of a support and promoters. The relative change in principal kinetic parameters of Si-supported and P- and T1-promoted catalyst (K<sub>3</sub>) and of the unsupported catalysts, but promoted with P and T1 (K<sub>2</sub>) was about 5–10% for 60 days, while with the unsupported catalyst without promoters (K<sub>1</sub>) the yield of formaldehyde decreased by about 30% during 80 h. The more stable activity of the catalyst K<sub>2</sub> and K<sub>3</sub> is associated also to some extent with the stabilizing role of the support and the promoters.</p></div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 1","pages":"Pages 55-66"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-9834(91)80023-P","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80945984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Applied CatalysisPub Date : 1991-10-01DOI: 10.1016/0166-9834(91)80019-S
M. Skoglundh, L.O. Löwendahl, J.-E. Otterated *
{"title":"Combinations of platinum and palladium on alumina supports as oxidation catalysts","authors":"M. Skoglundh, L.O. Löwendahl, J.-E. Otterated *","doi":"10.1016/0166-9834(91)80019-S","DOIUrl":"10.1016/0166-9834(91)80019-S","url":null,"abstract":"<div><p>The effects of the total content of Pd + Pt, the mol-% ratio of Pd to Pt, hydrothermal treatment of the catalyst wash-coat, and the oxygen concentration on the light-off temperature,<em>T</em><sub>50</sub>, for the complete oxidation of xylene isomers, propene, and carbon monoxide were studied. The alumina wash-coats were thermally treated at 500 °C for 2 h in air or after the thermal treatment, hydrothermally treated at 814 °C for 2 h in 100-% steam. The catalysts were impregnated with 5, 10, and 20 μmol of Pd + Pt per gram of catalyst. The mol-% ratio of Pd to Pt was varied in the range from 0:100 to 100:0. The light-off temperatures had a minimum at a Pd : Pt mol-% ratio of 80:20, and decreased with increasing total metals concentration, increasing oxygen concentration and hydrothermal treatment of the alumina wash-coat.</p></div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 1","pages":"Pages 9-20"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-9834(91)80019-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83941443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}