Applied Catalysis最新文献_第7页

Characterization of a potassium-promoted cobalt- molybdenum/alumina water-gas shift catalyst 钾促进钴-钼/氧化铝水气转换催化剂的表征

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80064-4

Xiaofan Xie *, Hengbo Yin, Bosheng Dou, Jichuan Huo

{"title":"Characterization of a potassium-promoted cobalt- molybdenum/alumina water-gas shift catalyst","authors":"Xiaofan Xie *, Hengbo Yin, Bosheng Dou, Jichuan Huo","doi":"10.1016/0166-9834(91)80064-4","DOIUrl":"10.1016/0166-9834(91)80064-4","url":null,"abstract":"<div>A series of potassium-promoted CoMo/Al2O3 has been investigated by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR). CoMoO4 was found in the CoMo/Al2O3 catalyst by XRD and is destroyed by the presence of potassium. The reducibility of molybdenum is enhanced by potassium in the CoMoK/Al2O3 catalyst and is easier to reduce to MoIV during sulfidation. In the oxidic state catalyst cobalt is increased on the surface by the addition of potassium. After sulfidation this phenomena disappeared, the distribution of cobalt remains at a constant level and is unaffected by the potassium content. The addition of potassium leads to a monotonical decrease of the molybdenum dispersion with the impregnating amount of potassium in the oxidic state catalyst but is more complicated after sulfidation. Potassium is well dispersed on the surface in both the oxidic and sulfided state. The activity in the water-gas shift reaction was correlated with the potassium content of CoMoK/Al2O3.</div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 2","pages":"Pages 187-198"},"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)80064-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81441979","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}

引用次数: 31

Calendar of forthcoming events 即将举行的活动日历

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80082-8

引用次数: 0

Carbonylation 羰基化反应

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80078-B

引用次数: 0

Yield, catalysis and the meaning of life 产量，催化和生命的意义

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80076-9

引用次数: 0

Gallium, aluminium and mixed gallium-aluminium pillared montmorillonite 镓、铝及混合镓铝柱蒙脱土

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80073-6

Antonio Vieira Coelho, Georges Poncelet *

引用次数: 38

Catalytic activity and product distribution in the cracking of C6-C8 alkenes on the ammonium salt of 12-tungstophosphoric acid 12-钨磷酸铵盐催化C6-C8烯烃裂解活性及产物分布

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80070-D

Vikram S. Nayak, John B. Moffat *

引用次数: 5

Influence of metal loading on the reducibility and hydrogenation activity of cobalt/alumina catalysts 金属负载对钴/氧化铝催化剂还原性和加氢活性的影响

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80067-7

Wei-Jye Wang, Yu-Wen Chen *

引用次数: 167

Catalysis and materials science: ‘through the glass darkly’ 催化与材料科学:“透过黑暗的玻璃”

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80083-9

Graham J. Hutchings

引用次数: 0

Comparative loss of alkali promoter by desorption from two catalysts for the dehydrogenation of ethyl benzene to styrene 乙苯脱氢制苯乙烯两种催化剂解吸碱促进剂的比较损失

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80068-8

Klas Engvall, Leif Holmlid *, P. Govind Menon

{"title":"Comparative loss of alkali promoter by desorption from two catalysts for the dehydrogenation of ethyl benzene to styrene","authors":"Klas Engvall, Leif Holmlid *, P. Govind Menon","doi":"10.1016/0166-9834(91)80068-8","DOIUrl":"10.1016/0166-9834(91)80068-8","url":null,"abstract":"<div>Using molecular-beam and mass-spectrometric methods, the comparative desorption of potassium as K atoms and as excited-state (K2*) species was studied from two commercial iron oxide catalysts (A and B, of which the latter was known to be superior) for the styrene process. The desorption of potassium from B was only observed at temperatures considerably higher than that from A. The measured activation energy values for emission are: (a) for K atoms, 1.0 eV (96 kJ/mol) and 3.1 eV (300 kJ/mol) from A and B resp.; (b) for K2* species, 1.7 eV (160 kJ/mol) and 0.84 eV (81 kJ/mol) from A and B resp. The temperature ranges where these values are measured are (a) (A) 830-920 K, (B) 970-1090 K and (b) (A) 810-1060 K, (B) 910-1060 K. The lower emission barrier for the excited state species from B may perhaps be responsible for the better and more stable performance of this catalyst in the styrene process. The excited states observed in emission here are believed to be formed also under normal operating conditions on the catalyst surfaces.</div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"77 2","pages":"Pages 235-241"},"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)80068-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85586074","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}

引用次数: 26

High resolution solid-state1H nuclear magnetic resonance spectra of organic template in hydrated aluminophosphate VPI-5 水合磷酸铝-5中有机模板的高分辨率固态1h核磁共振谱

Applied Catalysis Pub Date : 1991-10-15 Epub Date: 2001-10-02 DOI: 10.1016/0166-9834(91)80062-2

Waclaw Kolodziejski , Joa˜o Rocha, Heyong He, Jacek Klinowski *

引用次数: 8