A Comparative Study of Methanol Synthesis from CO2/H2 and CO/H2 over a Cu/ZnO/Al2O3 Catalyst

Lee, Jae Sung; Lee, Kee Hyouk; Lee, Sang Young; Kim, Young Gul

doi:10.1006/jcat.1993.1342

Cited by 147 publications

(74 citation statements)

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“…Other studies have shown that, on Cu/ZnO catalysts, CO 2 /H 2 mixtures produce a formate species that is an intermediate to CH 3 OH on both Cu and ZnO surfaces, but that CO/H 2 mixtures produce formate only on the ZnO support surface [8,[38][39][40][41][42][43]. SiO 2 has few hydroxyl groups, but slow methanation side reactions (Eq.…”

Section: Discussionmentioning

confidence: 99%

“…The slow approach to steady-state methanol synthesis rates was also observed on Cu-ZnO catalysts. For example, Lee et al [42] reported that steady-state rates were reached on Cu/ZnO/Al 2 O 3 after 5 and 20 h on stream for CO 2 /H 2 and CO/H 2 feeds, respectively. These transients were attributed to the spillover of reactive intermediates or hydrogen atoms from Cu to ZnO.…”

Section: Discussionmentioning

confidence: 99%

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New insights into methanol synthesis catalysts from X-ray absorption spectroscopy

Meitzner¹,

Iglesia

1999

Catalysis Today

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X-ray absorption spectroscopic studies from several different groups provide a consistent structural picture of methanol synthesis catalysts. Copper metal is the principal Cu species detected in all in-situ XAS studies. A small amount of Cu(II) persisted in many samples reduced below 600 K, but it appears to be catalytically irrelevant. Cu(I) was not detected in any of the in-situ XAS studies. The Zn structure did not change in response to chemical treatments in any of the ZnO-containing methanol synthesis catalysts.We conclude that the slow approach to steady-state rate of methanol synthesis from CO/H 2 mixtures cannot result from changes in the Cu metal component of Cu/SiO 2 catalysts. By eliminating this possibility, we provide indirect evidence for the proposal that initial induction periods reflect slow changes in the surface of the SiO 2 or ZnO component in the catalysts. A bifunctional mechanism involving the formation of formate from CO on support hydroxyl groups would increase methanol synthesis rates as OH groups are formed by hydrolysis of Si-O bonds using the H 2 O formed in slow methanation side reactions. The bifunctional mechanism is not required for the synthesis of methanol from CO 2 -containing mixtures, because formate can form on Cu directly from CO 2 and H 2 .

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

New insights into methanol synthesis catalysts from X-ray absorption spectroscopy

Meitzner¹,

Iglesia

1999

Catalysis Today

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“…This theory has been widely accepted and confirmed by numerous researchers including Skrzypek and Lee (Lee et al, 1993;Skrzypek et al, 1991). As methanol formation is an exothermal reaction with a reduction in the number of moles, a decrease of temperature and rise in pressure should favour the reaction thermodynamically, but chemically inert CO 2 needs high temperature to activate and then to form methanol (Skrzypek et al, 1990, Skrzypek et al, 1995.…”

Section: Fig 1 Diagram Of Catalyst Preparationmentioning

confidence: 83%

“…Literature reports concerning the advantageous influence of zirconium have been appearing for several years (Arena et al, 2008;Ihm et al, 1997;Lee et al, 1993;Ortelli et al, 2001;Słoczyński et al, 2001;Wambach et al,1999). The authors investigated various modifiers of Cu/ZnO/Al 2 O 3 catalyst and realised that Zr improved its activity in methanol synthesis from H 2 + CO 2 .…”

Section: Fig 1 Diagram Of Catalyst Preparationmentioning

confidence: 99%

Copper/Zinc Catalysts in Hydrogenation of Carbon Oxides

Kulawska

Madej-Lachowska

2013

Chemical and Process Engineering

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“…Syngas was then directly converted into methanol at high temperature of 300-450 o C and at a pressure of (250-350atm). First commercial plant of methanol formation was introduced by BASF(Badische Anilin and Soda Fabrik ) in 1920 [25]. Catalytic hydrogenation of methanol formation is an exothermic reaction.…”

Section: P=mentioning

confidence: 99%