(594d) Synthesis of Silica Supported Ni and Cu Catalyst for Carbon Dioxide Conversion

Authors: 
Aheed, A., Qatar University
Kumar, A., Qatar University
Saad, M. A. H. S., Qatar University

 

 

Synthesis
of Silica Supported Ni and Cu Catalyst for Carbon Dioxide Methanation Reaction

Ahmad
Aheed " times new roman>, Mohd Ali H Saleh Saad*, Anand Kumar*

Department
of Chemical Engineering, Qatar University, Doha, Qatar

*
m.saleh@qu.edu.qa,
and akumar@qu.edu.qa

line-height:115%;font-family:" times new roman> 

line-height:115%;font-family:" times new roman>Carbon dioxide is an
undesired byproduct in almost all the energy production routes involving
combustion of hydrocarbons or fossil fuels. CO2 being one of the
prominent greenhouse gas is understood to have a direct influence of the global
environmental conditions, and in this regard many researchers are exploring the
possible ways to convert CO2 to hydrocarbons, or other chemicals to
complete the carbon cycle. With an aim of so, CO2 methanation has
experienced a renewed research interest, especially because of its
thermodynamic favorability under moderate conditions (temperature and
pressure). CO2 methanation is a combination of two reactions,
reverse water gas shift (RWGS) and CO methanation as [1]:

                           (1)

                              (2)

In
this study we investigate the synthesis of nickel and copper catalyst supported
on silica for CO2 conversion to methane. The activity and product
selectivity and stability for methanation reaction on Ni/SiO2 and Cu/SiO2
catalysts have been evaluated using a flow reactor between 50ºC – 650ºC.
The as-synthesized catalysts were characterized using XRD, SEM, TEM to understand
the structural properties. In addition, the used catalysts after the reaction were
characterized using similar techniques to evaluate the effect of reaction conditions
on active phase and SiO2 support. As indicated in Fig. 1; the 1%Ni
on SiO2 catalyst shows good activity for CO2 conversion
to CH4 till 450ºC, thereafter CH4 formation decreases and CO
increases and remains the only product at 650ºC. The catalyst shows excellent
stability (Fig. 1b) without any deactivation till 2700 min of TOS at 650ºC. The
other catalysts, 1%Cu on SiO2 is also promising (fig. not shown),
however it is exclusively selective to CO and no trace of CH4 was
obtained.  

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Figure 1:
Methane conversion on Ni/SiO2 catalysts, (a) activity and product
yield, (b) stability up to 2700 min TOS

line-height:115%;font-family:" times new roman> 

line-height:115%;font-family:" times new roman>References:

line-height:115%;font-family:" times new roman>[1] S. Tada, S. Ikeda, N.
Shimoda, T. Honma, M. Takahashi, A. Nariyuki, and S. Satokawa, “Sponge Ni
catalyst with high activity in CO2 methanation,” Int. J. Hydrogen
Energy
, vol. 42, no. 51, pp. 30126–30134, 2017.

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