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Current Issue
1987 Vol.4 Issue.1,
Published 1987-01-15
Article
Article
1
Advances in the Study on the Catalyst and Reaction Mechanism of the Synthesis of Low Alcohols
Li Yong-Dan Zhao Jiu-Sheng Zhu Chun-Li Zhang Liu
The study on the catalyst and reaction mechanism of the synthesis of methanol and higher alcohols has drawn much attention in recent years. Better understanding of the relationship between catalyst preparation, structure and catalytic behaviour has been promoted. Searching for precursors with structures in which the components have intimate contact and are uniformly dispersed and for techniques to prepare them, such as Feitknecht compounds and spenils, has been worked on. The concept that uniform distribution of proper amount of alkli metal ionsoon Cu-based catalyst surface is favourable to enhance both activity and selectivity to form higher alcohols has been generally accepted. Yet there are still various views on the active site and the mechanism of the catalytic reaction. Many different explanations of the role of alkli metal ion and oxidizing agent such as CO_2 and H_2O in the reaction process have been given. This paper reviews the recent advances in the above mentioned aspects with emphasis on the of development of Cu-based catalysts itself and on the understanding of the active site and the reaction mechanism.
1987 Vol. 4 (1): 1-10 [
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11
A Novel Catalyst for Methanol Synthesis
Zhao Jiu-Sheng Ma Fu-Shan Kang Hui-Min Zhu Chun-Li Li Yong-Dan Ren Pei-Min
A rovel catslyst for low pressule methanol synthesis is pres-ented. The catalyst was obtained by decomposition of Cu-Zn-Al Fe-itknecht compound. Activity, thermostability and life were determi-ned at high pressure with a microreactor.
1987 Vol. 4 (1): 11-17 [
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18
The Effect of Reduction and Passivation Conditions of Low Pressure Methanol Catalyst on Catalytic Properties
Zhang Ji-Yan Li Yu-Min Wang Jia-Fu Zhang Liu
Through activity evaluation, the effects on catalytic properties of low pressure methanol Catalyst CuO/ZriO/Al_2O_3/V_2O_5 of calcination, reduction and passivation have been investigated. By means of orthogonal design of experiments, the sequence of the factors which influece notably on activities has been obtained. A good program has been carried out. The results confirm that low h-ydrogen concentration, high space velocity and low heating rate are favourable for obtaining high activity and selectivity. The catalytic activities of the catalyst reduced at different constant temperatures are in the following order: 220℃>180℃>140℃. Calci-nation at 350℃ has given low selectivity for methanol, with total carbon conversion unchanged. The passivation experiments have shown that the reduced catalyst is extremely sensitive to oxygen. Only very low O_2-content, ～0.01% in nitrogen, can be used for passivation in order to completely restore its activity XRD, TA, TPR and IR informations have been utilized to fur-nish the basis of theoretical explanation fos the experimental re-sults.
1987 Vol. 4 (1): 18-26 [
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1874
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1987 Vol. 4 (1): 26-32 [
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1336
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5
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1987 Vol. 4 (1): 32-40 [
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1487
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5
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1987 Vol. 4 (1): 41-47 [
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1386
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5
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48
1987 Vol. 4 (1): 48-50 [
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1452
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51
1987 Vol. 4 (1): 51-55 [
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1364
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55
1987 Vol. 4 (1): 55-63 [
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1373
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63
1987 Vol. 4 (1): 63-68 [
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1400
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69
1987 Vol. 4 (1): 69-72 [
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1371
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73
1987 Vol. 4 (1): 73-73 [
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1307
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73
1987 Vol. 4 (1): 73-73 [
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1285
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1987 Vol. 4 (1): 73-74 [
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1206
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1987 Vol. 4 (1): 74-74 [
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1307
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1987 Vol. 4 (1): 74-75 [
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1987 Vol. 4 (1): 75-75 [
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1324
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1987 Vol. 4 (1): 75-75 [
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1233
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1987 Vol. 4 (1): 76-76 [
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1281
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1987 Vol. 4 (1): 76-76 [
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1246
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76
1987 Vol. 4 (1): 76-76 [
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1203
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76
1987 Vol. 4 (1): 76-76 [
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1282
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