P. Mckendry, Energy production from biomass (part 3): gasification technologies, Bioresour. Technol, vol.83, issue.1, pp.55-63, 2002.

M. Syc, M. Pohorely, M. Jeremias, M. Vosecky, P. Kameníkova et al., Behavior of heavy metals in steam fluidized bed gasification of contaminated biomass, Energy Fuels, vol.25, issue.5, pp.2284-2291, 2011.

A. Nzihou and S. Brian, The fate of heavy metals during combustion and gasification of contaminated biomass-a brief review, J. Hazard. Mater, pp.56-66, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01632395

A. K. Gupta and S. Sinha, Phytoextraction capacity of the plants growing on tannery sludge dumping sites, Bioresour. Technol, vol.98, issue.9, pp.1788-1794, 2007.

C. Lievens, R. Carleer, T. Cornelissen, and J. Yperman, Fast pyrolysis of heavy metal contaminated willow: influence of the plant part, Fuel, vol.88, issue.8, pp.1417-1425, 2009.

X. Zhang, B. Laubie, V. Houzelot, and E. Plasari, Increasing purity of ammonium nickel sulfate hexahydrate and production sustainability in a nickel phytomining process, Chem. Eng. Res. Des, vol.106, pp.26-32, 2015.

S. Eibner, J. Blin, and A. Julbe, Pyrolysis Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass, J. Anal. Appl, vol.113, pp.143-152, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01625185

K. Bru, J. Blin, A. Julbe, and G. Volle, Pyrolysis of metal impregnated biomass: an innovative catalytic way to produce gas fuel, J. Anal. Appl. Pyrolysis, vol.78, pp.291-300, 2007.
URL : https://hal.archives-ouvertes.fr/hal-00165774

J. T. Gallagher and H. Harker, Reaction of carbon with oxidizing gases: catalysis by compounds of iron, cobalt and nickel. Carbon, N. Y, vol.2, pp.163-173, 1964.

J. L. Figueiredo, J. Rivera-utrilla, and M. A. Ferro-garcia, Gasification of active carbons of different texture impregnated with nickel, cobalt and iron, Carbon N. Y, vol.25, issue.5, pp.703-708, 1987.

Y. Richardson, J. Blin, and A. Julbe, A short overview on purification and conditioning of syngas produced by biomass gasification: catalytic strategies, process intensification and new concepts, Prog. Energy Combust. Sci, vol.38, pp.765-781, 2012.
URL : https://hal.archives-ouvertes.fr/hal-01690088

H. J. Park, S. H. Park, J. M. Sohn, J. Park, J. K. Jeon et al., Steam reforming of biomass gasification tar using benzene as a model compound over various Ni supported metal oxide catalysts, SUPPL), vol.101, pp.101-103, 2010.

P. H. Blanco, C. Wu, J. A. Onwudili, V. Dupont, and P. T. Williams, Catalytic pyrolysis/gasification of refuse derived fuel for hydrogen production and tar reduction: influence of nickel to citric acid ratio using Ni/SiO2 catalysts, Waste Biomass Valor, vol.5, issue.4, pp.625-636, 2014.

P. H. Blanco, C. Wu, J. A. Onwudili, and P. T. Williams, Characterization of tar from the pyrolysis/gasification of refuse derived fuel: influence of process parameters and catalysis, Energy Fuels, vol.26, issue.4, pp.2107-2115, 2012.

Y. Richardson, J. Blin, G. Volle, J. Motuzas, and A. Julbe, General in situ generation of Ni metal nanoparticles as catalyst for H 2-rich syngas production from biomass gasification, Appl. Catal. A Gen, vol.382, issue.2, pp.220-230, 2010.

C. Guizani, F. J. Escudero-sanz, and S. Salvador, The nature of the deposited carbon at methane cracking over a nickel loaded wood-char, Comptes Rendus Chim, vol.19, issue.4, pp.423-432, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01709739

D. L. Parkhurst and C. A. Appelo, Description of Input and Examples for PHREEQC Version 3-A Computer Program for Speciation, Batch-Reaction, One-Dimensional Transport, and Inverse Geochemical Calculations. U.S. Geological Survey Techniques and Methods, book 6, chapter A43, U.S. Geol. Surv. Tech. Methods, B, vol.6, pp.6-43, 2013.

W. F. Degroot and F. Shafizadeh, The influence of exchangeable cations on the carbonization of biomass, J. Anal. Appl. Pyrolysis, vol.6, pp.217-232, 1984.

K. Sakai, M. Matsunaga, K. Minato, and F. Nakatsubo, Effects of impregnation of simple phenolic and natural polycyclic compounds on physical properties of wood, J. wood Sci, vol.45, issue.3, pp.227-232, 1999.

I. Villaescusa, N. Fiol, M. Martinez, N. Miralles, J. Poch et al., Removal of copper and nickel ions from aqueous solutions by grape stalks wastes, Water Res, vol.38, pp.992-1002, 2004.

G. Dobele, T. Dizhbite, G. Rossinskaja, G. Telysheva, D. Meier et al., Pre-treatment of biomass with phosphoric acid prior to fast pyrolysis: a promising method for obtaining 1,6-anhydrosaccharides in high yields, J. Anal. Appl. Pyrolysis, pp.197-211, 2003.

G. Domazetis, J. Liesegang, and B. D. James, Studies of inorganics added to low-rank coals for catalytic gasification, Fuel Process. Technol, vol.86, issue.5, pp.463-486, 2005.

M. G. Grønli, G. Várhegyi, and C. Di-blasi, Thermogravimetric analysis and devolatilization kinetics of wood, Ind. Eng. Chem. Res, vol.41, issue.17, pp.4201-4208, 2002.

K. Slopiecka, P. Bartocci, and F. Fantozzi, Thermogravimetric analysis and kinetic study of poplar wood pyrolysis, Appl. Energy, vol.97, pp.491-497, 2012.

F. X. Collard, J. Blin, A. Bensakhria, and J. Valette, Influence of impregnated metal on the pyrolysis conversion of biomass constituents, J. Anal. Appl. Pyrolysis, vol.95, pp.213-226, 2012.

T. G. Devi and M. P. Kannan, Nickel catalyzed air gasification of cellulosic chars s jump in reactivity, Energy Fuels, vol.16, pp.583-590, 2001.
DOI : 10.1021/ef0001540

K. Sharma, F. J. Vastola, and P. L. Walker, Reduction of nickel oxide by carbon: II. Interaction between nickel oxide and natural graphite, Carbon N. Y, vol.35, issue.4, pp.529-533, 1997.
DOI : 10.1016/0008-6223(72)90423-x

J. T. Richardson, R. Scates, and M. V. Twigg, X-ray diffraction study of nickel oxide reduction by hydrogen, Appl. Catal. A Gen, vol.246, issue.1, pp.137-150, 2003.
DOI : 10.1016/s0926-860x(02)00669-5

A. Mahar, P. Wang, A. Ali, M. Kumar, A. Hussain et al., Ecotoxicology and Environmental Safety Challenges and opportunities in the phytoremediation of heavy metals contaminated soils: a review, Ecotoxicol. Environ. Saf, vol.126, pp.111-121, 2016.