Partial Regeneration of Ni-Based Catalysts for Hydrogen Production via Methane Cracking

Reyyan KOÇ; Erdoğan ALPER; Eric CROISET; Ali ELKAMEL

Makale detayları

Partial Regeneration of Ni-Based Catalysts for Hydrogen Production via Methane Cracking

Yazarlar:

Reyyan KOÇ | Erdoğan ALPER | Eric CROISET | Ali ELKAMEL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2008 Vol.32 Issue 2, pp.157-168

Belge Tipi:

Makale

Yayın Tarihi:

1/2008

Belge Dili:

Türkçe

Document ID (Org No.):

2000728522

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

Methane cracking has the potential to produce high purity,  carbon monoxide-free hydrogen suitable for application in PEM fuel  cells.  The 2 products of the reaction are molecular hydrogen and  solid carbon.  The carbon appears in the form of carbon filaments  whose growth is hindered by carbon encapsulation leading to total  deactivation of the catalyst.  Several attempts have been made to  regenerate the catalyst, mainly by gasifying the carbon filament in  air or steam.  Our work on 5-wt% Ni/g-Al2O3 indicated that  after complete gasification of the carbon the catalyst lost nearly all  its activity toward methane cracking.  However, if the gasification  proceeds to only a certain extent, it is possible to recover  significant activity of the catalyst.  This technique, also known as  partial regeneration, is a promising strategy to overcome the  challenge of catalyst deactivation in catalytic decomposition of  methane.  Optimization of the partial regeneration method is presented  here, in particular the extent to which the gasification should take  place.  Activity of the catalyst and the extent of gasification have  been monitored through thermogravimetric analysis.    Regeneration of catalyst is still a much-questioned field to maintain not   only a continuous and also an economical process. That is why this   experimental study focused on regeneration of nickel supported on alumina.   As an overview of this study: The effects of percentage of nickel,   application of reduction, reaction temperature, and the amount of gasified   carbon on weight gain are stated as the rate of carbon formation per gram of   nickel present in catalyst.

 

Methane cracking has the potential to produce high purity,  carbon monoxide-free hydrogen suitable for application in PEM fuel  cells.  The 2 products of the reaction are molecular hydrogen and  solid carbon.  The carbon appears in the form of carbon filaments  whose growth is hindered by carbon encapsulation leading to total  deactivation of the catalyst.  Several attempts have been made to  regenerate the catalyst, mainly by gasifying the carbon filament in  air or steam.  Our work on 5-wt% Ni/g-Al2O3 indicated that  after complete gasification of the carbon the catalyst lost nearly all  its activity toward methane cracking.  However, if the gasification  proceeds to only a certain extent, it is possible to recover  significant activity of the catalyst.  This technique, also known as  partial regeneration, is a promising strategy to overcome the  challenge of catalyst deactivation in catalytic decomposition of  methane.  Optimization of the partial regeneration method is presented  here, in particular the extent to which the gasification should take  place.  Activity of the catalyst and the extent of gasification have  been monitored through thermogravimetric analysis.    Regeneration of catalyst is still a much-questioned field to maintain not   only a continuous and also an economical process. That is why this   experimental study focused on regeneration of nickel supported on alumina.   As an overview of this study: The effects of percentage of nickel,   application of reduction, reaction temperature, and the amount of gasified   carbon on weight gain are stated as the rate of carbon formation per gram of   nickel present in catalyst.

Makale detayları

Partial Regeneration of Ni-Based Catalysts for Hydrogen Production via Methane Cracking

Yazarlar: Reyyan KOÇ | Erdoğan ALPER | Eric CROISET | Ali ELKAMEL

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2008 Vol.32 Issue 2, pp.157-168

Belge Tipi: Makale

Yayın Tarihi: 1/2008

Belge Dili: Türkçe

Document ID (Org No.): 2000728522

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Reyyan KOÇ | Erdoğan ALPER | Eric CROISET | Ali ELKAMEL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2008 Vol.32 Issue 2, pp.157-168

Belge Tipi:

Makale

Yayın Tarihi:

1/2008

Belge Dili:

Türkçe

Document ID (Org No.):

2000728522

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527